Electric water heater power conversion and startup and shutdown control device and quick-heating type electric water heater

Abstract

The invention discloses an electric water heater power conversion and startup and shutdown control device and a quick heating type electric water heater, the device comprises a water pressure driving mechanism and a power conversion and startup and shutdown control mechanism, the water pressure driving mechanism comprises a shell, a diaphragm, a driving piece and two touch pieces, the driving piece drives the two touch pieces through two driving springs respectively, and the diaphragm is arranged in the shell; each touch piece is provided with a limiting part and a touch part; the control mechanism comprises a mounting seat, a switching rotating shaft, a signal microswitch and two power microswitches, one end of the switching rotating shaft extends outwards in the axial direction to form a plurality of driving convex strips, the switching rotating shaft is rotated to a set position, the water heater enters a shutdown state from a working state, a contact of the signal microswitch acts, and the power microswitch is switched on. A control panel of the electric water heater delays a set time and then closes a power supply of the electromagnetic gate valve so as to close water inlet of the electric water heater, and when the water inlet closing state is delayed, the driving convex strip presses the limiting parts of the two touch pieces, so that the electric heating pipe does not work. The device is reliable in action, high in use safety and long in service life.

Description

Technical Field

[0001] The invention relates to the technical field of electric water heater manufacturing, in particular to a power conversion and on / off control device for an electric water heater and a quick-heating electric water heater. Background Art

[0002] In the field of electric water heater technology, due to the different usage scenarios, it is necessary to control the on / off function, and some also need to have water pressure detection function, heating power conversion function, etc. In order to realize these functions, various control devices are needed. If these control devices are independent of each other, on the one hand, these devices will increase the difficulty of structural layout and assembly of electric water heaters; on the other hand, since the control devices are independent of each other, their linkage effect is poor, which makes it easy for control errors to occur, affecting the reliability of the water heater and the convenience of operation. In addition, some fast-heating electric water heaters have high heating power and small inner tank capacity. When the water stops flowing and is turned on again, the residual heat of the heating tube of the electric water heater will heat the water in the inner tank to a higher temperature. This may scald people when the water is turned on again, causing safety hazards.

[0003] Therefore, in order to solve the problem of independent control devices, people began to consider combining these control devices together. For example, on January 14, 2009, a patent with the number ZL200820101558.9 and the name "Two-in-one switch for pressure detection and power conversion of water heater" was disclosed, which includes a pressure detection device, a power dial, and a micro switch group; the pressure detection device has a rubber diaphragm in contact with the water of the measured water pressure and a pressure transmission member in contact with the outer side of the rubber diaphragm, and the pressure transmission member has a transmission end; the micro switch group is provided with a contact, one side of the power dial abuts against the transmission end of the pressure transmission member, and the other side abuts against the surface of the micro switch group provided with the contact, and the surface is provided with a concave portion for accommodating the contact and a convex portion for pressing down the contact; the power dial is also provided with a driving member for driving it to rotate. This invention combines the pressure detection device and the power conversion device into an integral component, which not only saves the micro switch and connecting wire of the pressure detection device, reduces the failure rate, makes installation more convenient, but also saves space. However, this device cannot solve the problem that water may scald people when the machine is restarted during power conversion; and its power dial needs to achieve relative movement with the pressure transmission part and the micro switch contacts through rotational friction at the same time, which is easy to get stuck, which will reduce the service life and make it difficult to ensure that the electric heating tube does not work. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a power conversion and power on / off control device for an electric water heater, which integrates the structure of power conversion and power on / off, facilitates installation and operation, and improves the reliability of function switching; it can also prevent the problem of scalding caused by excessively high water outlet temperature when the power is restarted during the power conversion process, ensures that the electric heating tube of the electric water heater does not work in the shutdown position, improves safety of use, and extends service life.

[0005] To achieve the above-mentioned purpose, the technical scheme of the present invention is: a power conversion and on / off control device for an electric water heater, comprising a hydraulic drive mechanism, a power conversion and on / off control mechanism, wherein the hydraulic drive mechanism comprises a shell having an inner cavity and a diaphragm connected to the shell and dividing the inner cavity of the shell, the inner cavity of the shell on one side of the diaphragm is connected to the water inlet pipe of the electric water heater, and the inner cavity of the shell on the other side of the diaphragm is equipped with a driving member, one end of the driving member abuts against the diaphragm, and the other end drives two contact members respectively through two driving springs, and a reset spring is also installed between the driving member and the shell, and one end of the reset spring abuts against the driving member and the other end abuts against the shell;

[0006] The power conversion and on / off control mechanism comprises a mounting seat, a switching shaft, a signal micro switch and two power micro switches, the mounting seat is fixedly connected to the housing, the switching shaft is pivotally connected to the mounting seat in a manner of being rotatable in the circumferential direction and immovable in the axial direction, the signal micro switch and the two power micro switches are respectively fixedly connected to the mounting seat, and each power micro switch cooperates with the electric water heater control panel to control a group of electric heating tubes to work;

[0007] Two contact members are mounted on the shell and can be displaced axially along the switching shaft, each contact member is provided with a limiting portion and a touching portion; the contacts of the two power micro switches correspond to the touching portion of one contact member respectively; one end of the switching shaft extends outward along the axial direction with a plurality of driving convex strips, and after the water inlet pipe is filled with water and reaches the set water pressure, the water pressure drives the diaphragm to deform and drives the driving member to shift to one side of the switching shaft, and the switching shaft is rotated, and the driving convex strips on the switching shaft can touch the limiting portion of one contact member respectively or touch the limiting portions of two contact members at the same time or do not contact the limiting portions of the two contact members, so that the touching portion of one of the contact members touches one of the power micro switch contacts or the touching portions of the two contact members do not touch the contacts of the two power micro switches or the touching portions of the two contact members touch one power micro switch contact respectively;

[0008] Rotate the switching shaft to the set position, the water heater enters the shutdown state from the working state, the signal microswitch contacts are actuated, the control panel of the electric water heater turns off the power supply of the electromagnetic gate valve after a delay of the set time, and then the electromagnetic gate valve closes the water inlet pipe. When the water inlet state is delayed, the switching shaft uses the driving convex strip to press the limit parts of the two contact members, so that the contact parts of the two contact members cannot touch the two power microswitch contacts, so that the electric heating tube of the electric water heater does not work.

[0009] As a further improvement, a gap or a contact convex portion is provided in the middle of the switching shaft, and the contact direction of the signal micro switch contact is perpendicular to the central axis of the switching shaft; when the switching shaft is rotated to a set position, the water heater enters the shutdown state from the working state, and the gap gives way to the signal micro switch contact or the contact convex portion touches the signal micro switch contact to make the signal micro switch contact actuate. In this way, the overall structure is more compact and the action reliability is higher.

[0010] Preferably, there are three driving ridges extending axially outward from one end of the switching shaft, namely, the first driving ridge, the second driving ridge and the third driving ridge, which are all distributed in arc shape, and the central axes corresponding to the first driving ridge, the second driving ridge and the third driving ridge overlap, the first driving ridge and the second driving ridge are on the same cylindrical surface, and the third driving ridge is on another cylindrical surface; the first driving ridge or the second driving ridge is used to touch the limiting part of one of the contact members, and the third driving ridge is used to touch the limiting part of another of the contact members. This driving ridge is easy to touch or disengage with the limiting part of the contact member, thereby improving the reliability of the action.

[0011] Further improvement, the touching direction of the two power micro switch contacts is parallel to the central axis of the switching shaft, the touching member comprises a body, a concave hole is provided on one end surface of the body, a limiting portion and a touching portion are extended outwardly from the other end surface of the body, and the length of the touching portion extending outwardly from the other end surface of the body is greater than the length of the limiting portion extending outwardly from the other end surface of the body;

[0012] One end of each of the driving springs is inserted into one of the concave holes, and the housing is provided with two mounting holes. The body of each of the contact members is sleeved on one of the mounting holes. The cross section of the mounting hole is adapted to the cross section of the body so that the body cannot rotate relative to the mounting hole. The other end of the driving member is provided with two positioning posts extending along the axial direction of the switching shaft, and the other end of each of the driving springs is sleeved on one of the positioning posts. This not only makes the connection of each part more reliable, but also enables the driving member to more reliably drive the two contact members respectively through the two driving springs, and at the same time, the driving member and the contact member can also relatively move and give way.

[0013] As a further improvement, the limiting part is a hemisphere, the contact part is a cylinder, and the positioning column extends into one of the concave holes through the mounting hole. Both ends of each driving convex strip are provided with inclined guide parts to improve the reliability of movement between the parts.

[0014] Further improvement, the housing comprises an upper housing and a lower housing which are fixed together, the diaphragm is clamped between the upper housing and the lower housing, a connecting pipe is provided on the lower housing, the connecting pipe is connected to the water inlet pipe of the electric water heater, and two mounting holes are provided on the upper housing, each mounting hole is connected to the inner cavity of the housing, so as to facilitate assembly.

[0015] As a further improvement, a driving shaft is pivotally connected to the mounting seat, a driving gear is fixedly arranged on the driving shaft, a driven gear is fixedly arranged on the switching shaft, and the driving gear meshes with the driven gear. This makes it easy to set the position of the driving shaft, to match with the external power knob, and to improve the overall aesthetics.

[0016] As a further improvement, the switching shaft is provided with a plurality of positioning grooves along the radial direction, and an elastic positioning member is installed on the mounting seat, and a positioning convex portion is provided on the positioning member, and after the switching shaft rotates to a certain position, the positioning convex portion on the positioning member matches with one of the positioning grooves, so as to improve the rotation feel and facilitate the gear switching.

[0017] The power conversion and on / off control device for an electric water heater of the present invention integrates the power conversion and on / off functions into one control device because the water pressure driving mechanism and the power conversion and on / off control mechanism are fixedly connected as one through the shell and the mounting base, and the relevant functional parts can interact with each other, so that the power conversion and on / off functions are integrated into one control device, which makes installation convenient, the linkage of the relevant functional parts reliable, and the operation convenient; at the same time, the driving member drives two touch members respectively through two driving springs, which not only allows the touch members and the driving member to give way to each other, realizing soft connection and better giving way, but also the driving member and the touch member do not need to rub against each other, thus preventing the functional parts from getting stuck with each other or reducing their service life due to hard contact friction, thereby improving the reliability of the overall action, making the control more reliable, and extending the service life.

[0018] On the other hand, by rotating the switch shaft to the set position, the water heater goes from the working state to the shutdown state, the signal micro switch contacts are actuated, the control panel of the electric water heater turns off the power supply of the electromagnetic gate valve after a delay of the set time, and then the electromagnetic gate valve closes the water inlet of the water inlet pipe. When the water inlet state is delayed, the switch shaft uses the driving convex strip to press the limit parts of the two touch parts, so that the touch parts of the two touch parts cannot touch the two power micro switch contacts, so that the electric heating tube of the electric water heater does not work. In this way, the electric heating tube can still keep the water out for the set time after it stops working, so that the cold water takes away the residual heat of the electric heating tube, which can effectively prevent the problem of scalding people due to the excessively high water outlet temperature when the machine is restarted during the power conversion process, and ensure that the electric heating tube of the electric water heater does not work in the shutdown position, thereby improving the safety of use.

[0019] The present invention also discloses an instant electric water heater, comprising an inner tank, two groups of electric heating tubes, a water inlet pipe and a water outlet pipe, the two groups of electric heating tubes are installed on the inner tank, the water inlet pipe is connected to the water inlet of the inner tank, and the water outlet pipe is connected to the water outlet of the inner tank. The instant electric water heater also includes the above-mentioned power conversion and power on / off control device, the electromagnetic gate valve is arranged on the water inlet pipe, and the inner cavity of the shell on one side of the diaphragm is connected to the water inlet pipe between the electromagnetic gate valve and the water inlet of the inner tank.

[0020] Further improvement, the instant electric water heater also includes a rear seat and a surface shell, the inner tank is fixedly connected to the rear seat, a left connecting terminal and a right connecting terminal are also fixedly connected to the rear seat, and a left water inlet branch pipe and a right water inlet branch pipe connected to each other are also provided near the water inlet end of the water inlet pipe;

[0021] A flow valve is also provided between the electromagnetic gate valve and the water inlet of the inner tank in the water inlet pipe, and the inner cavity of the shell on one side of the diaphragm is connected to the water inlet pipe between the electromagnetic gate valve and the flow valve, so as to adjust the water inlet flow rate and further adjust the water outlet temperature and water outlet flow rate;

[0022] A power knob and a flow knob are also provided outside the housing. The flow knob is connected to the flow valve to control the water flow of the inner tank, and the power knob is connected to the power conversion and on / off control device to control the heating power and on / off of the electric heating tube, so as to facilitate assembly and operation.

[0023] The instant electric water heater of the present invention uses the above-mentioned electric water heater power conversion and on / off control device, so that the overall structure is compact, the operation is convenient, the control is reliable, and the safety of use is improved and the service life is extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a three-dimensional diagram of the power conversion and on / off control device of the present invention;

[0025] Figure 2 yes Figure 1 3D exploded view of

[0026] Figure 3 is a top view of the power conversion and on / off control device of the present invention;

[0027] Figure 4 yes Figure 3 AA section view;

[0028] Figure 5 It is a three-dimensional diagram of the touch piece;

[0029] Figure 6 It is a three-dimensional diagram of the switching shaft;

[0030] Figure 7 is a three-dimensional diagram of the instant electric water heater of the present invention;

[0031] Figure 8 It is a three-dimensional diagram of the hidden face shell of the instant electric water heater of the present invention;

[0032] Fig. 9 It is a three-dimensional diagram of the instant electric water heater of the present invention, including a hidden front shell, a rear seat, a control panel, a power knob and a flow knob;

[0033] Fig.10 It is a schematic diagram of the three driving convex strips on the switching shaft of the present invention corresponding to the two contact member limit parts in different gear positions. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0035] Figures 1 to 6 and Figure 8 As shown, a power conversion and on / off control device for an electric water heater includes a water pressure driving mechanism 100 and a power conversion and on / off control mechanism 200.

[0036] The hydraulic drive mechanism 100 includes a shell 1 with an inner cavity and a diaphragm 2 connected to the shell 1 and dividing the inner cavity of the shell 1. The diaphragm 2 can be a rubber diaphragm. The shell 1 includes an upper shell 11 and a lower shell 12 that are fixed together. The diaphragm 2 is clamped between the upper shell 11 and the lower shell 12. A connecting pipe 13 is provided on the lower shell 12. The connecting pipe 13 is connected to the water inlet pipe 30 of the electric water heater, that is, the inner cavity 14 of the shell 1 on one side of the diaphragm 2 is connected to the water inlet pipe 30 of the electric water heater; the inner cavity 15 of the shell 1 on the other side of the diaphragm 2 is equipped with a driving member 3, one end of the driving member 3 is against the diaphragm 2, and the other end drives two touch members 5 respectively through two driving springs 4. A return spring 6 is also installed between the driving member 3 and the upper shell 11 of the shell 1, one end of the return spring 6 is against the driving member 3, and the other end is against the upper shell 11 of the shell 1. Each touch member 5 is provided with a limiting portion 51 and a touch portion 52. A plurality of supporting protrusions 121 are disposed in the lower shell 12 , and the plurality of supporting protrusions 121 are used to support the diaphragm 2 to prevent the diaphragm 2 from being excessively deformed and damaged.

[0037] See also Figure 5 As shown, the touch member 5 includes a body 53, a concave hole 54 is provided on one end surface of the body 53, a limiting portion 51 and a touching portion 52 are extended outwardly from the other end surface of the body 53, and the length of the touching portion 52 extending outwardly from the other end surface of the body 53 is greater than the length of the limiting portion 51 extending outwardly from the other end surface of the body 53; the edge of the cross-sectional shape of the body 53 includes a circle, the circle is connected to one end of two parallel lines along the radial direction, and the other ends of the two parallel lines are connected to two ends of an arc, the limiting portion 51 is a hemisphere, and the touching portion 52 is a cylinder.

[0038] The power conversion and power-on / off control mechanism 200 includes a mounting seat 1a, a switching shaft 2a, a power-on / off signal microswitch 3a and two power microswitches 4a. The mounting seat 1a is fixedly connected to the shell 1. Specifically, the mounting seat 1a is fixedly connected to the upper shell 11 of the shell 1 by screws; the switching shaft 2a is pivotally connected to the mounting seat 1a in a circumferentially rotatable and axially fixed manner, the signal microswitch 3a and the two power microswitches 4a are respectively fixedly connected to the mounting seat 1a, the touching direction of the contacts of the two power microswitches 4a is parallel to the central axis of the switching shaft 2a, the touching direction of the contacts of the signal microswitch 3a is perpendicular to the central axis of the switching shaft 2a, and each power microswitch 4a cooperates with the electric water heater control board 601 to control the operation of a group of electric heating tubes 20.

[0039] The two contact members 5 are mounted on the shell 1 and can be displaced axially along the switching shaft 2a. Specifically, two mounting holes 111 are provided on the upper shell 11 of the shell 1, and each mounting hole 111 is connected to the inner cavity 15 of the shell 1. The body 53 of each of the contact members 5 is sleeved on a mounting hole 111, and the cross-section of the mounting hole 111 is adapted to the cross-section of the body 53 so that the body 53 cannot rotate relative to the mounting hole 111; one end of each of the driving springs 4 is sleeved into one of the recessed holes 54, and the other end of the driving member 3 is provided with two positioning columns 31 extending axially along the switching shaft 2a, and the other end of each of the driving springs 4 is sleeved on one of the positioning columns 31, and the positioning column 31 extends into one of the recessed holes 54 through the mounting hole 111, and the contacts of the two power micro switches 4a respectively correspond to the touch portion 52 of a contact member 5.

[0040] One end of the switching shaft 2a has three driving ridges extending axially outward, which are the first driving ridge 21a, the second driving ridge 22a and the third driving ridge 23a. The first driving ridge 21a, the second driving ridge 22a and the third driving ridge 23a are all distributed in an arc shape, and the central axes corresponding to the first driving ridge 21a, the second driving ridge 22a and the third driving ridge 23a overlap. The first driving ridge 21a and the second driving ridge 22a are on the same cylindrical surface, and the third driving ridge 23a is on another cylindrical surface; the first driving ridge 21a or the second driving ridge 22a is used to touch the limiting portion 51 of one of the touching members 5, and the third driving ridge 23a is used to touch the limiting portion 51 of another touching member 5. Both ends of the first driving ridge 21a are provided with inclined guide portions 211a, both ends of the second driving ridge 22a are provided with inclined guide portions 221a, and both ends of the third driving ridge 23a are provided with inclined guide portions 231a, so as to cooperate and contact with the limiting portion 51 of the touch member 5 during the rotation process.

[0041] After water enters the water inlet pipe 30 of the water heater and reaches the set water pressure, the water pressure drives the diaphragm 2 to deform and drives the driving member 3 to shift to the side of the switching shaft 2a, and rotates the switching shaft 2a. The multiple driving convex strips, namely the first driving convex strip 21a, the second driving convex strip 22a and the third driving convex strip 23a, can respectively touch the limiting portion 51 of one touching member 5 or touch the limiting portions 51 of two touching members 5 at the same time or do not contact the limiting portions 51 of both touching members 5, so that the touching portion 52 of one of the touching members 5 touches one of the contacts of the power microswitch 4a or the touching portions 52 of the two touching members 5 do not touch the contacts of the two power microswitches 4a or the touching portions 52 of the two touching members 5 respectively touch one contact of the power microswitch 4a; in this way, the heating power of the electric water heater can be adjusted by whether the contacts of the two power microswitches 4a are touched.

[0042] Rotate the switching shaft 2a to the set position, the water heater enters the shutdown state from the working state, the signal microswitch contact 3a is actuated, and the control board 601 of the electric water heater turns off the power supply of the electromagnetic gate valve 60 after a delay of the set time, and then the electromagnetic gate valve 60 turns off the water inlet of the water inlet pipe 30. When the water inlet state is delayed, the switching shaft 2a uses the above-mentioned two driving convex strips to press the limiting parts 51 of the two touch members 5, so that the touch parts 52 of the two touch members 5 cannot touch the contacts of the two power micro switches 4a, and the electric heating tubes 20 of the electric water heater do not work.

[0043] Rotate the switch shaft 2a to the set position, the water heater enters the shutdown state from the working state, and the specific structure of the action of the signal microswitch contact 3a is: a clearance gap 24a is provided in the middle of the switch shaft 2a, and the touching direction of the signal microswitch 3a contact is perpendicular to the central axis of the switch shaft 2a; rotate the switch shaft 2a to the set position, the water heater enters the shutdown state from the working state, and the clearance gap 24a makes way for the signal microswitch 3a contact so that the signal microswitch 3a contact acts.

[0044] When the signal micro switch 3a is a normally closed switch, the clearance notch 24a in the middle of the switching shaft 2a can be designed as a touch convex portion, and then the touch convex portion touches the contact of the signal micro switch 3a to activate the signal micro switch 3a.

[0045] The switching shaft 2a is provided with five positioning grooves 25a in the radial direction, and an elastic positioning member 5a is installed on the mounting seat 1a, and a positioning convex portion 51a is provided on the positioning member 5a. After the switching shaft 2a rotates to switch a gear position, the positioning convex portion 51a on the positioning member 5a matches with one of the positioning grooves 25a, so as to improve the rotation switching feel and ensure the reliability of power switching.

[0046] The mounting base 1a is also pivotally connected to a driving shaft 6a, on which a driving gear 61a is fixed, and on the switching shaft 2a a driven gear 26a is fixed, and the driving gear 61a meshes with the driven gear 26a. This facilitates the matching with the housing of the electric water heater, facilitates the structural setting and the knob setting, and improves the aesthetics.

[0047] When the power conversion and on / off control device is used, the driving shaft 6a is rotated so that the driving gear 61a drives the driven gear 26a and the switching shaft 2a to rotate, thereby performing gear switching.

[0048] Combination Figures 1 to 9 As shown, a quick-heating electric water heater comprises an inner tank 10, two groups of electric heating tubes 20, a water inlet pipe 30, a water outlet pipe 40 and the power conversion and switch control device 50 described in the above embodiment, the two groups of electric heating tubes 20 are installed on the inner tank 10, the heating power of the two groups of electric heating tubes 20 is different, the water inlet pipe 30 is connected to the water inlet of the inner tank 10, the water outlet pipe 40 is connected to the water outlet of the inner tank 10, an electromagnetic gate valve 60 is arranged on the water inlet pipe 30, and a flow valve 70 is also arranged between the electromagnetic gate valve 60 and the water inlet of the inner tank 10. The inner cavity of the shell 1 on one side of the diaphragm 2 is connected to the water inlet pipe 30 between the electromagnetic gate valve 60 and the flow valve 70, that is, the connecting pipe 13 on the lower shell 12 is connected to the water inlet pipe 30 between the electromagnetic gate valve 60 and the flow valve 70; the control board 601 closes the water inlet of the water inlet pipe 30 through the electromagnetic gate valve 60 after a delay setting time.

[0049] The instant electric water heater of this embodiment also includes a rear seat 80 and a surface shell 90, and the inner tank 10 is fixedly connected to the rear seat 80. The rear seat 80 is also fixedly connected with a left connecting terminal 801 and a right connecting terminal 802, so that both the left and right sides can be connected to an external power source, which is convenient for the installation of the electric water heater; the water inlet pipe 30 is also provided with a left water inlet branch pipe 301 and a right water inlet branch pipe 302 that are interconnected near the water inlet end; in this way, the external water inlet pipe can be connected in three directions: the left side, the right side and the bottom side, further improving the convenience of installation, and the port not connected to the water inlet end can be blocked with a plug.

[0050] The control panel 601 is arranged between the surface shell 90 and the inner tank 10; a power knob 901 and a flow knob 902 are also provided outside the surface shell 90, and the flow knob 902 is fixedly connected to the rotating shaft of the flow valve 70 to control the water inlet flow of the inner tank 10, and the water outlet temperature can also be adjusted by controlling the water inlet flow; the power knob 901 is fixedly connected to the driving shaft 6a of the power conversion and power on / off control device 50, and the switching shaft 2a is rotated through the driving shaft 6a to control the heating power and power on / off of the electric heating tube.

[0051] The control process of this instant electric water heater is as follows: Fig.10As shown, in the off state, that is, in the O gear position, the positioning protrusion 51a on the positioning member 5a cooperates with one of the positioning grooves 25a on the switching shaft 2a, and the contact of the signal microswitch 3a gives way through the giving way notch 24a in the middle of the switching shaft 2a, the contact is disconnected and does not operate, the control board 601 of the electric water heater disconnects the power supply of the electromagnetic gate valve 60, and the electromagnetic gate valve 60 closes the water inlet pipe 30. At this time, the flow knob 902 can be in the set position.

[0052] Next, the power knob 901 is rotated to rotate the drive shaft 6a, and the drive shaft 6a meshes with the driven gear 26a through the driving gear 61a to rotate the switching shaft 2a. Fig.10 The marking direction is rotated 72°, so that the positioning protrusion 51a on the positioning member 5a cooperates with the other positioning groove 25a on the switching shaft 2a, and the heating enters the I gear. At this time, the switching shaft 2a touches the contact of the signal micro switch 3a, and the signal micro switch 3a is turned on. Then, the power supply of the electromagnetic gate valve 60 is turned on through the control board 601, and the water inlet pipe 30 enters the inner tank 10. After the water inlet pipe 30 reaches the set water pressure, the water pressure drives the diaphragm 2 to deform through the connecting pipe 13, driving the driving member 3 to shift to one side of the switching shaft 2a. The other end of the driving member 3 drives the two driving springs 4 respectively. The touch member 5 moves toward the side of the switching shaft 2a, and the third driving convex strip 23a touches and presses the limiting portion 51 of a touch member 5, so that the touching portion 52 of this touch member 5 cannot touch the corresponding contact of a power microswitch 4a, and the power microswitch 4a does not work, and a group of electric heating tubes 20 does not work; while the first driving convex strip 21a and the third driving convex strip 23a do not contact the limiting portion 51 of another touch member 5, and the touching portion 52 of the other touch member 5 can touch one of the contacts of the power microswitch 4a to make the other group of electric heating tubes 20 work and heat, thereby realizing the first heating power heating.

[0053] Next, rotate the power knob 901 to switch the shaft 2a along the Fig.10The marking direction is rotated another 72°, and the positioning protrusion 51a on the positioning member 5a cooperates with the other positioning groove 25a on the switching shaft 2a to enter the II gear heating. At this time, the switching shaft 2a keeps touching the contact of the signal micro switch 3a, and the power supply of the electromagnetic gate valve 60 is continuously turned on through the control board 601. The water inlet pipe 30 enters the inner tank 10. After the water inlet pipe 30 reaches the set water pressure, the water pressure drives the diaphragm 2 to deform through the connecting pipe 13, driving the driving member 3 to shift to the side of the switching shaft 2a. The other end of the driving member 3 drives the two touch members 5 to move to the side of the switching shaft 2a through the two driving springs 4. The first When the driving convex strip 21a touches and presses the limiting portion 51 of a touch member 5, the touching portion 52 of the touch member 5 cannot touch the corresponding contact of a power microswitch 4a, and the power microswitch 4a does not operate and is disconnected, so a group of electric heating tubes 20 is disconnected and does not work; while the second driving convex strip 22a and the third driving convex strip 23a do not contact the limiting portion 51 of another touch member 5, and the touching portion 52 of another touch member 5 can touch the contact of another power microswitch 4a to make another group of electric heating tubes 20 work and heat, and when heating in gear I, a group of electric heating tubes 20 is disconnected and does not work, thereby realizing the second heating power heating.

[0054] Then, rotate the power knob 901 to switch the shaft 2a along the Fig.10 The marked direction is rotated another 72°, and the positioning protrusion 51a on the positioning member 5a cooperates with the other positioning groove 25a on the switching shaft 2a to enter the III gear heating. At this time, the switching shaft 2a keeps touching the contact of the signal microswitch 3a, and the power supply of the electromagnetic gate valve 60 is continuously connected through the control board 601. Water enters the inner tank 10 through the water inlet pipe 30. After the water inlet pipe 30 reaches the set water pressure, the water pressure drives the diaphragm 2 to deform through the connecting pipe 13, driving the driving member 3 to shift to the side of the switching shaft 2a. The other end of the driving member 3 drives the two touch members 5 to move to the side of the switching shaft 2a through the two driving springs 4 respectively. The first driving convex strip 21a, the second driving convex strip 22a and the third driving convex strip 23a do not contact the limiting parts 51 of the two touch members 5. The touching parts 52 of the two touch members 5 can respectively touch the contacts of a power microswitch 4a, so that the two groups of electric heating tubes 20 are both working and heating, realizing the third heating power heating, and the heating power is maximum at this time.

[0055] Then, the power knob 901 is rotated again, and the switching shaft 2a moves along Fig.10The marked direction is rotated another 72°, and the positioning protrusion 51a on the positioning member 5a cooperates with the other positioning groove 25a on the switching shaft 2a to enter the IV gear; at this time, the switching shaft 2a keeps touching the contact of the signal microswitch 3a, and the power supply of the electromagnetic gate valve 60 is continuously connected through the control board 601, and the water inlet pipe 30 enters the inner tank 10. After the water inlet pipe 30 reaches the set water pressure, the water pressure drives the diaphragm 2 to deform through the connecting pipe 13, driving the driving member 3 to shift to the side of the switching shaft 2a, and the other end of the driving member 3 drives the two touch members 5 to move to the side of the switching shaft 2a through the two driving springs 4, and the second driving convex strip 22a and the third driving convex strip 23a respectively press the limit parts 51 of the two touch members 5, and the touch parts 52 of the two touch members 5 cannot touch the contact of the power microswitch 4a, and the electric heating tube 20 does not work, stops heating, and discharges cold water.

[0056] Then, the power knob 901 is rotated again, and the switching shaft 2a moves along Fig.10 The marking direction is rotated by another 72°, and the positioning protrusion 51a on the positioning member 5a cooperates with the other positioning groove 25a on the switching shaft 2a to return to the O gear position, and the contact of the signal micro switch 3a returns to its position through the giving way action of the giving way notch 24a in the middle of the switching shaft 2a. The control board 601 delays the set time and then disconnects the power supply of the electromagnetic gate valve 60. After the delay set time is reached, the electromagnetic gate valve 60 closes the water inlet pipe 30. At the same time, the second driving convex strip 22a and the third driving convex strip 23a respectively press the limit parts 51 of the two touch members 5, and the touch parts 52 of the two touch members 5 cannot touch the contacts of the power micro switch 4a, ensuring that both groups of electric heating tubes 20 are not working.

[0057] When this embodiment is quickly rotated from any gear position to the shutdown gear position, the control panel 601 will delay the set time before disconnecting the power supply of the electromagnetic gate valve 60, and then close the water inlet of the water inlet pipe 30. When the water inlet is delayed and closed, the second drive convex strip 22a and the third drive convex strip 23a respectively press the limit parts 51 of the two touch members 5, so that the touch parts 52 of the two touch members 5 cannot touch the contacts of the power micro switch 4a, ensuring that both sets of electric heating tubes 20 are not working. Prevent people from being scalded by the water outlet due to the excessively high water temperature in the inner tank when the machine is restarted to discharge water, thereby improving the safety of use. When it is necessary to adjust the water outlet flow rate and water outlet temperature, it can also be adjusted by rotating the flow knob 902.

[0058] In this embodiment, except for the O gear position in the shutdown state, the making way notch 24a in the middle of the switching shaft 2a makes way for the contact of the signal microswitch 3a so that the contact of the signal microswitch 3a moves back to the disconnected position. In other gear positions, the switching shaft 2a presses the contact of the signal microswitch 3a so that the signal microswitch 3a is turned on.

[0059] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A power conversion and on / off control device for an electric water heater, characterized in that: The invention comprises a hydraulic drive mechanism, a power conversion and a switch control mechanism, wherein the hydraulic drive mechanism comprises a shell having an inner cavity and a diaphragm connected to the shell and dividing the inner cavity of the shell, the inner cavity of the shell on one side of the diaphragm is connected to the water inlet pipe of the electric water heater, and the inner cavity of the shell on the other side of the diaphragm is equipped with a driving member, one end of the driving member abuts against the diaphragm, and the other end drives two contact members respectively through two driving springs, and a reset spring is also installed between the driving member and the shell, and one end of the reset spring abuts against the driving member, and the other end abuts against the shell; The power conversion and on / off control mechanism comprises a mounting seat, a switching shaft, a signal micro switch and two power micro switches, the mounting seat is fixedly connected to the housing, the switching shaft is pivotally connected to the mounting seat in a manner of being rotatable in the circumferential direction and immovable in the axial direction, the signal micro switch and the two power micro switches are respectively fixedly connected to the mounting seat, and each power micro switch cooperates with the electric water heater control panel to control a group of electric heating tubes to work; Two contact members are mounted on the shell and can be displaced axially along the switching shaft, each contact member is provided with a limiting portion and a touching portion; the contacts of the two power micro switches correspond to the touching portion of one contact member respectively; one end of the switching shaft extends outward along the axial direction with a plurality of driving convex strips, and after the water inlet pipe is filled with water and reaches the set water pressure, the water pressure drives the diaphragm to deform and drives the driving member to shift to one side of the switching shaft, and the switching shaft is rotated, and the driving convex strips on the switching shaft can touch the limiting portion of one contact member respectively or touch the limiting portions of two contact members at the same time or do not contact the limiting portions of the two contact members, so that the touching portion of one of the contact members touches one of the power micro switch contacts or the touching portions of the two contact members do not touch the contacts of the two power micro switches or the touching portions of the two contact members touch one power micro switch contact respectively; Rotate the switching shaft to the set position, the water heater enters the shutdown state from the working state, the signal microswitch contacts are actuated, the control panel of the electric water heater turns off the power supply of the electromagnetic gate valve after a delay of the set time, and then the electromagnetic gate valve closes the water inlet pipe. When the water inlet state is delayed, the switching shaft uses the driving convex strip to press the limit parts of the two contact members, so that the contact parts of the two contact members cannot touch the two power microswitch contacts, so that the electric heating tube of the electric water heater does not work.

2. The power conversion and on / off control device for an electric water heater according to claim 1, characterized in that: A clearance notch or a touch convex portion is provided in the middle of the switching shaft, and the touch direction of the signal microswitch contact is perpendicular to the central axis of the switching shaft; when the switching shaft is rotated to the set position, the water heater enters the shutdown state from the working state, and the clearance notch makes way for the signal microswitch contact or the touch convex portion touches the signal microswitch contact to cause the signal microswitch contact to operate.

3. The power conversion and on / off control device for an electric water heater according to claim 1, characterized in that: There are three driving ridges extending axially outward at one end of the switching shaft, which are the first driving ridge, the second driving ridge and the third driving ridge. The first driving ridge, the second driving ridge and the third driving ridge are all distributed in an arc shape, and the central axes corresponding to the first driving ridge, the second driving ridge and the third driving ridge overlap. The first driving ridge and the second driving ridge are on the same cylindrical surface, and the third driving ridge is on another cylindrical surface; the first driving ridge or the second driving ridge is used to touch the limiting portion of one of the touching members, and the third driving ridge is used to touch the limiting portion of another of the touching members.

4. The power conversion and on / off control device for an electric water heater according to claim 1, characterized in that: The contact direction of the two power micro switch contacts is parallel to the central axis of the switching shaft, the contact member comprises a body, a concave hole is provided on one end surface of the body, a limiting portion and a touching portion extend outwardly from the other end surface of the body, and the length of the touching portion extending outwardly from the other end surface of the body is greater than the length of the limiting portion extending outwardly from the other end surface of the body; One end of each of the driving springs is inserted into one of the recessed holes, and two mounting holes are provided on the shell. The body of each of the touching members is inserted into one of the mounting holes, and the cross-section of the mounting hole is adapted to the cross-section of the body so that the body cannot rotate relative to the mounting hole; the other end of the driving member is provided with two positioning columns extending along the axial direction of the switching shaft, and the other end of each of the driving springs is inserted into one of the positioning columns.

5. The power conversion and on / off control device for an electric water heater according to claim 4, characterized in that: The limiting portion is a hemispherical body, the contact portion is a cylindrical body, and the positioning column extends into one of the concave holes through the mounting hole.

6. The power conversion and on / off control device for an electric water heater according to claim 4, characterized in that: The shell includes an upper shell and a lower shell that are fixed together, the diaphragm is clamped between the upper shell and the lower shell, a connecting pipe is provided on the lower shell, the connecting pipe is connected to the water inlet pipe of the electric water heater, two mounting holes are provided on the upper shell, and each mounting hole is connected to the inner cavity of the shell.

7. The power conversion and on / off control device for an electric water heater according to claim 1, characterized in that: A driving shaft is also pivotally connected to the mounting seat, a driving gear is fixedly arranged on the driving shaft, a driven gear is fixedly arranged on the switching shaft, and the driving gear is meshed with the driven gear.

8. The power conversion and on / off control device for an electric water heater according to claim 1, characterized in that: The switching shaft is provided with a plurality of positioning grooves along the radial direction, and an elastic positioning member is installed on the mounting seat, and a positioning convex portion is provided on the positioning member. After the switching shaft rotates and switches to a position, the positioning convex portion on the positioning member cooperates with one of the positioning grooves.

9. An instant electric water heater, comprising an inner tank, two sets of electric heating tubes, a water inlet pipe and a water outlet pipe, wherein the two sets of electric heating tubes are mounted on the inner tank, the water inlet pipe is connected to the water inlet of the inner tank, and the water outlet pipe is connected to the water outlet of the inner tank, characterized in that: It also includes the power conversion and power on / off control device as described in any one of claims 1 to 8 above, the electromagnetic gate valve is arranged on the water inlet pipe, and the inner cavity of the shell on one side of the diaphragm is connected to the water inlet pipe between the electromagnetic gate valve and the water inlet of the inner tank.

10. The instant electric water heater according to claim 9, characterized in that: The invention also comprises a rear seat and a surface shell, the inner tank is fixedly connected to the rear seat, a left connecting terminal and a right connecting terminal are also fixedly connected to the rear seat, and a left inlet branch pipe and a right inlet branch pipe connected to each other are also provided near the water inlet end of the water inlet pipe; The water inlet pipe is also provided with a flow valve between the electromagnetic gate valve and the water inlet of the inner tank, and the inner cavity of the shell on one side of the diaphragm is connected to the water inlet pipe between the electromagnetic gate valve and the flow valve; A power knob and a flow knob are also provided outside the surface shell. The flow knob is connected to the flow valve to control the water inlet flow of the inner tank. The power knob is connected to the power conversion and power on / off control device to control the heating power and power on / off of the electric heating tube.

Images