Electric valve

Abstract

The invention provides an electric valve which comprises an actuator and a valve body assembly, the valve body assembly comprises a valve element and a transmission part, the actuator comprises a motor and a gear set, and the gear set is used for driving the transmission part to drive the valve element to act; the actuator further comprises a switch for controlling the motor, the gear set at least comprises one gear, and one gear in the gear set is a control gear. The control gear is provided with a first matching part and a second matching part; when the control gear rotates until the valve core is fully opened, the first matching part loosens the switch to close the motor; when the control gear rotates until the valve core is fully closed, the second matching part loosens the switch to close the motor; when the control gear rotates until the valve element is located between the full-open state and the full-closed state, the switch is switched on, and the motor is in a working state. The scheme can reduce the opening and closing control cost of the electrically operated valve.

Description

[0001] This application is a divisional application. The application number of the parent case is: 202311776286.8, the application date of the parent case is: December 21, 2023, and the invention creation name of the parent case is: An electric valve. Technical Field

[0002] The present invention relates to the technical field of valve devices, and particularly relates to an electric valve. Background Art

[0003] The opening and closing control of an electric valve generally drives a valve core by setting a synchronous motor or a DC motor, and two microswitches and a cam are set to position the valve core. That is, when the valve core is in the fully open position, the cam rotates to press against a microswitch, causing the microswitch to disconnect, then the electric valve closes and the valve core remains in the fully open position. When the valve core is in the fully closed position, the cam rotates to press against the other microswitch, causing the other microswitch to disconnect, then the electric valve closes and the valve core remains in the fully closed position. Summary of the Invention

[0004] The purpose of this application is to provide an electric valve that can relatively reduce the control cost of opening and closing the electric valve.

[0005] This application provides an electric valve, including an actuator and a valve body assembly. The valve body assembly includes a valve core and a transmission part. The actuator includes a motor and a gear set. The gear set is used to drive the transmission part to drive the valve core to act. The actuator also includes a switch for controlling the motor. The gear set includes a control gear, and the control gear can abut or move away from the switch. The control gear is provided with a first mating part and a second mating part.

[0006] When the control gear rotates to the fully open position of the valve core, the first mating part is released from the switch to turn off the motor. When the control gear rotates to the fully closed position of the valve core, the second mating part is released from the switch to turn off the motor. When the control gear rotates to a position between the fully open and fully closed positions of the valve core, the switch is turned on and the motor is in a working state.

[0007] The solution of this application utilizes the position change of the switch caused by the rotation of the control gear, forms different fits of release or abutment with the switch, thereby controlling the motor to start or stop as required. Only one switch needs to be set, which can relatively reduce the control cost of opening and closing the electric valve. Description of the Drawings

[0008] Figure 1 It is a schematic structural diagram of the electric valve in the first embodiment of this application;

[0009] Figure 2 For Figure 1 the axial sectional view;

[0010] Figure 3 For Figure 1 the explosion of;

[0011] Figure 4 For Figure 3 the explosion diagram of the actuator in;

[0012] Figure 5 For Figure 3 the top view of the actuator in;

[0013] Figure 6 For Figure 4 the schematic diagram of the second housing and its internal components in;

[0014] Figure 7 For Figure 6 the structural schematic diagram of the swing part in;

[0015] Figure 8 For Figure 6 the schematic diagram of the control gear in;

[0016] Figure 9 For Figure 5 the sectional view in the A - A direction in;

[0017] Figure 10 For Figure 6 the schematic diagram after removing the control gear in;

[0018] Figure 11 For Figure 9 the schematic diagram of the control gear in;

[0019] Figure 12 For Figure 9 the schematic diagram after the control gear rotates clockwise by a certain angle in;

[0020] Figure 13 For Figure 12 the schematic diagram after the control gear rotates clockwise by a certain angle in;

[0021] Figure 14 For Figure 2 the schematic diagram when the ball valve is in a state between fully open and fully closed in;

[0022] Figure 15 For Figure 2 the schematic diagram when the ball valve runs to the fully open state in;

[0023] Figure 16 The schematic diagram of the control circuit of the electric valve in the embodiments of the present application in two on - states through the first method;

[0024] Figure 17 The schematic diagram of the control circuit of the electric valve in the embodiments of the present application in two on - states through the second method;

[0025] Figure 18 It is a schematic structural diagram of the actuator of the electric valve in the second embodiment of the present application;

[0026] Figure 19 is Figure 18 the sectional view taken along the line B-B in [reference], corresponding to the fully closed state of the ball valve at this time;

[0027] Figure 20 is Figure 19 a schematic diagram of the control gear in [reference].

[0028] Figures 1-20 The descriptions of the reference numerals in the drawings are as follows: 100 - actuator; 101 - housing; 1011 - first housing; 1012 - second housing; 102 - spring seat; 103 - gear set; 1031 - control gear; 1031a - first arc wall; 1031b - first control wall; 1031c - second control wall; 1031d - groove part; 1031e - rib part; 1031f - shaft hole; 1031g - tooth part; 1031h - fourth control wall; 1031i - second arc wall; 1031j - third control wall; 1031k - first arm part; 1031l - second arm part; 1031m - wheel shaft; 1031n - protruding part; 1031o - arc groove section; 1031p - first end groove section; 1031q - second end groove section; 1064 - second connecting rod; 1065 - first connecting rod; 1066 - limiting part; 104 - motor; 1041 - output shaft; 105 - spring; 106 - swinging part; 1061 - rotating shaft; 1062 - inserting shaft; 1063 - rotating part; 1063a - pressing surface; 1063b - pressing surface; 1063c - first side surface; 1063d - second side surface; 107 - circuit board; 108 - worm; 109 - tactile switch; 1091 - contact; 109’ - micro switch; 1091’ - contact; 110 - first shaft hole seat; 111 - second shaft hole seat; 200 - buckle; 300 - valve body assembly; 301 - valve core ball; 302 - valve stem. Specific embodiments

[0029] In order to enable those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0030] Embodiment 1

[0031] As Figures 1-4 shown, Figure 1 this is a schematic structural diagram of an electric valve in the first embodiment of the present application; Figure 2 is Figure 1 an axial sectional view, where the axial direction here is the rotational axis direction of the valve stem 302 and the valve core ball 301; Figure 3 is Figure 1 explosion of; Figure 4 is Figure 3 an exploded view of the actuator 100 in;

[0032] The electric valve in this embodiment includes a valve body assembly 300, an actuator 100, and also includes a buckle 200 for connecting the valve body assembly 300 and the actuator 100. Of course, the buckle 200 is only a specific way to connect the two. The valve body assembly 300 includes a valve core and a transmission part for driving the valve core to act. Figure 2 If the electric valve shown in

[0033] is a ball valve, then the valve core is the valve core ball 301, and the transmission part specifically includes a valve stem 302. The valve stem 302 is in transmission connection with the valve core ball 301, and one end of the valve stem 302 can be inserted into the valve core ball 301 for connection.

[0033] The actuator 100 includes a motor 104 and a drive circuit b (shown in Figure 16 , 17 ), and the motor 104 can be a synchronous motor or a DC motor; the actuator 100 also includes a gear set 103. The power output of the motor 104 is transmitted by the gear set 103, and the gear set 103 drives the valve stem 302 to rotate, and then drives the valve core ball 301 to rotate. It can be seen that for different types of electric valves, the structures will be different. The electric valve is not limited to being a ball valve, and as long as it is a valve structure that drives the valve core to rotate directly or indirectly through the gear set 103, it is within the protection scope of the present application. The present application mainly relates to the associated setting of the movement of the gear set 103 and the opening and closing control of the motor 104, and does not limit the specific type of the electric valve. Only a ball valve is used for exemplary illustration below.

[0034] Please refer to Figure 5 , 6 , Figure 5 is Figure 3 a top view of the actuator 100 in; Figure 6 is Figure 4 a schematic diagram of the second housing and its internal components in;

[0035] The electric valve in this embodiment includes a swing part 106. The actuator 100 specifically includes a housing 101, as Figure 4As shown, the housing 101 includes a first housing 1011 and a second housing 1012, which are snapped together to form an accommodation chamber of the actuator 100. The motor 104 of the actuator 100, the circuit board 107 for arranging the drive circuit b, the gear set 103, etc. can all be arranged in the housing 101. The swing part 106 is also arranged in the housing 101 and is rotatably connected to the housing 101. Figure 6 The swing part 106 in Figure 6 includes a rotating shaft 1061. A first shaft hole seat 110 can be arranged in the housing 101. The first shaft hole seat 110 has an insertion hole, and the rotating shaft 1061 is inserted into the insertion hole of the first shaft hole seat 110 to achieve rotational connection. It can be seen that it is also possible to arrange an insertion hole on the swing part 106 and an axial part inserted into the insertion hole on the housing 101 to achieve the rotational connection of the swing part 106. The present embodiment does not specifically limit the rotational connection method of the swing part 106. The rotational axis of the swing part 106 and the rotational axis of the gear set 103 are parallel to each other.

[0036] In addition, as Figure 4 、 6 shown, the gear set 103 in the actuator 100 includes a plurality of gears. A worm 108 is connected to the output shaft 1041 of the motor 104. The worm 108 transmits the power of the motor 104 to the gear set 103. With such an arrangement, the motor 104 and the gear set 103 do not need to be arranged along the axial direction of the motor 104, and the space is relatively compact. It can be seen that it is also possible to directly connect the output shaft 1041 of the motor 104 to a gear of the gear set 103 along the axial direction. In the present embodiment, one of the gears in the gear set 103 is defined as a control gear 1031. The drive circuit b includes a switch. In addition to transmitting the power of the motor 104, the control gear 1031 is also used to control the on or off of the switch of the drive circuit, that is, to control the on or off of the drive circuit b, and accordingly, the on or off of the motor 104 can be controlled. In the present embodiment, the control gear 1031 is the output gear of the gear set 103, that is, the gear at the end of the gear set 103, and is directly connected to the valve stem 302.

[0037] Specifically, as Figure 6As shown, the actuator 100 further includes an elastic part, specifically a spring 105, which can also be other elastic structures. A spring seat 102 is provided on the housing 101. The spring seat 102 is cylindrical. A part of the spring 105 is embedded in the spring seat 102 to guide and protect the spring 105. Of course, the spring seat 102 can also be a columnar structure, and it is also possible to arrange the spring 105 outside the spring seat 102. Setting the spring seat 102 as a cylindrical shape is more conducive to the protection of the spring 105. In addition, in this embodiment, the switch of the drive circuit b includes a touch switch 109. One end of the spring 105 can press against the swing part 106, so that the swing part 106 rotates around the rotating shaft 1061 to a position where it can press the contact 1091 of the touch switch 109, thereby turning on the touch switch 109. The drive circuit b remains on, and the motor 104 can be in a working state to drive the valve core ball 301 to act.

[0038] It can be combined with Figure 7 for understanding that Figure 7 Figure Figure 6 10 is a schematic structural diagram of the swing part 106 in

[0039] The swing part 106 specifically includes a rotating part 1063. One end of the rotating part 1063 is connected to the rotating shaft 1061. The rotating part 1063 is generally a plate-like structure with two side surfaces, which are respectively defined as the first side surface 1063c and the second side surface 1063d. The rotating part 1063 is located between the spring 105 and the touch switch 109. The first side surface 1063c of the rotating part 1063 is closer to the spring 105. The first side surface 1063c has a pressing surface 1063a at the end far from the rotating shaft 1061. The pressing surface 1063a is used to press against the spring 105. The second side surface 1063d is closer to the touch switch 109. The second side surface 1063d includes a pressing surface 1063b. The pressing surface 1063b is used to contact and press the contact 1091 of the touch switch 109. It can be combined with Figure 6 for understanding that the pressing surface 1063b is generally located in the middle of the first side surface 1063c. When the rotating part 1063 rotates around the rotating shaft 1061 in the first direction ( Figure 6 counterclockwise in Figure 6 ), it can press the touch switch 109, or rotate in the second direction (

[0040] clockwise in Figure 6 ), which is opposite to the first direction, and it can disengage from the touch switch 109.

[0040] It can be combined with Figure 6 for understanding that in order to make the swing part 106 better contact with the spring 105 and the touch switch 109, when the pressing surface 1063b presses against the touch switch 109, the pressing surface 1063b is generally parallel to the end face of the contact 1091 of the touch switch 109, so as to increase the contact area and ensure stable pressing. The pressing surface 1063a is also generally parallel to the end face of the spring 105 to ensure stable pressing of the spring 105. In addition, asFigure 6 , 7 As shown in 7 , the rotating member 1063 is not a flat plate but a multi-stage stepped plate. Correspondingly, the first side surface 1063c and the second side surface 1063d are not flat surfaces but multi-stage stepped surfaces. Specifically, the first side surface 1063c includes three stepped surfaces, and the middle stepped surface is the pressing surface 1063b. One stepped surface of the second side surface 1063d away from the rotating shaft 1061 is the pressing surface 1063a. Such a setting can achieve the required rotational stroke space within a limited space range. It can be known that the rotating member 1063 can also be a flat plate. In comparison, in the same space, obviously Figure 6 , 7 the multi-stage stepped plate structure described above can achieve a larger rotational stroke.

[0041] Looking again Figures 8-11 , Figure 8 is Figure 6 a schematic diagram of the control gear 1031 in Figure 6 ; Figure 9 is Figure 5 a sectional view taken along the A-A direction in Figure 5 ; Figure 10 is Figure 6 a schematic diagram after removing the control gear 1031 in Figure 6 , showing the provided second shaft hole seat 111 for mating with the axle 1031m of the control gear 1031, and the swinging part 106 also switches to the state of pressing the touch switch 109; Figure 11 is Figure 9 a schematic diagram of the control gear 1031 in Figure 9 .

[0042] The control gear 1031 includes an axle 1031m and a tooth part 1031g. The axle 1031m is provided with a shaft hole 1031f into which the valve rod 302 can be inserted. The hole wall of the shaft hole 1031f includes two relatively arranged flat walls for driving connection with the valve rod 302. A circle of meshing teeth is provided on the outer periphery of the tooth part 1031g. A groove part 1031d is provided on one end face of the tooth part 1031g along the axial direction. In this embodiment, the groove part 1031d is specifically arranged around the axle 1031m. A rib part 1031e is connected to the outer peripheral wall of the axle 1031m. The rib part 1031e serves as two end walls of the groove part 1031d, and a part of the outer peripheral wall of the axle 1031m serves as a part of the wall of the groove part 1031d.

[0043] It can be seen that the groove portion 1031d is not limited to such a setting, and it can also be spaced from the axle 1031m. The outer peripheral wall of the axle 1031m can be used to move the groove portion away from the meshing teeth to reduce the impact on the strength of the meshing teeth. In addition, the groove portion 1031d has a bottom wall, but it is also possible for the groove portion 1031d to penetrate the tooth portion 1031g axially, that is, it can be set as a through groove. However, setting it as a groove structure is beneficial to ensuring the strength of the tooth portion 1031g. Further understanding, the groove portion 1031d can also be set in other forms. For example, a groove structure may not be provided on the end face of the tooth portion 1031g, and a convex block can be axially protruded, and the groove portion 1031d can be machined on the convex block. Here, machining the groove portion using the tooth portion 1031g can save space in the axial direction.

[0044] The groove portion 1031d includes an arc-shaped groove section 1031o and end groove sections located at both ends of the arc-shaped groove section 1031o, namely a first end groove section 1031p and a second end groove section 1031q. The above-mentioned swinging portion 106 is provided with a plug-in member, and the plug-in member is inserted into the groove portion 1031d. As Figure 7 described, the plug-in member is the plug shaft 1062. As Figure 9 shown, the arc-shaped groove section 1031o and the control gear 1031 are coaxial. When the arc-shaped groove section 1031o rotates with the control gear 1031 and rotates relative to the plug shaft 1062, the distance between the plug shaft 1062 and the axis of the control gear 1031 does not change. That is, when the control gear 1031 rotates, if the plug shaft 1062 of the swinging portion 106 is located in the arc-shaped groove section 1031o, the rotation of the control gear 1031 will not affect the position of the swinging portion 106. The plug shaft 1062 is configured such that when the plug shaft 1062 is in the arc-shaped groove section 1031o, the spring 105 presses against the pressing surface 1063a of the swinging portion 106 to press the touch switch 109, that is, to keep the touch switch 109 closed. The plug shaft 1062 is easily set to be inserted into the groove portion 1031d. The plug shaft 1062 can be a cylindrical shaft. Of course, the plug-in member is not limited to this structure, as long as it can be inserted into the groove portion 1031d and can press against the following two control walls.

[0045] In this embodiment, the inner side wall of the groove portion 1031d near the axis of the control gear 1031 is defined as the inner side wall, and the outer side wall of the groove portion 1031d away from the axis of the control gear 1031 is defined as the outer side wall. The part of the outer side wall corresponding to the arc-shaped groove section 1031o is the first arc-shaped wall 1031a, and the part of the outer side wall corresponding to the end groove section is defined as the control wall. The control wall of the first end groove section 1031p is the first control wall 1031b, and the control wall of the second end groove section 1031q is the second control wall 1031c. The control gear 1031 is provided with a first mating portion, a second mating portion, and a third mating portion. Specifically, in this embodiment, the first control wall 1031b, the second control wall 1031c, the first mating portion, and the second mating portion, and the first arc-shaped wall 1031a are the third mating portion. Moreover, relative to the first arc-shaped wall 1031a, the control wall is closer to the axis of the control gear 1031. The distance between the control wall and the axis of the control gear 1031 is defined as d (d is a range value in this embodiment), and the distance between the first arc-shaped wall 1031a and the axis is D, and it is required that D > d. Among them, when the insertion shaft 1062 is in the arc-shaped groove section 1031o, there is a gap between the insertion shaft 1062 and the first arc-shaped wall 1031a, and this gap is greater than or equal to zero. Of course, if the gap is zero, it may still affect the pressing when there are machining and assembly errors, so the gap is preferably greater than zero. Among them, it is required that D > d. In this way, when the control gear 1031 continues to rotate and the insertion shaft 1062 of the swing portion 106 relatively moves to be inserted into the end groove section, the first control wall 1031b of the first end groove section 1031p or the second control wall 1031c of the second end groove section 1031q will push the insertion shaft 1062 to move closer to the position near the axis. The first control wall 1031b and the second control wall 1031c are Figure 9 shown as straight walls, and are inclined towards the direction closer to the axis relative to the first arc-shaped wall 1031a. This is beneficial for quickly pushing the insertion shaft 1062 to drive the swing portion 106 to rotate and disengage from the touch switch 109. It can be seen that the control wall only needs to be able to push the swing portion 106, and it is not necessarily a straight wall. For example, the control wall is a curved surface wall that smoothly transitions with the first arc-shaped wall 1031a.

[0046] In addition, as Figure 7As shown, the swinging part 106 further includes a first connecting rod 1065 and a second connecting rod 1064. One end of the first connecting rod 1065 is connected to the end of the rotating part 1063 close to the rotating shaft 1061 or directly connected to the rotating shaft 1061. One end of the second connecting rod 1064 is connected to the middle part of the rotating part 1063. The other ends of the two connecting rods are both connected to the outer peripheral wall of the plug shaft 1062. In this way, the rotating part 1063 and the two connecting rods form a triangular support structure, which can stably connect the plug shaft 1062, making the swinging more stable and reliable, and also making it more labor-saving to push the swinging part 106. The swinging part 106 can also be provided with a limiting part 1066. The limiting part 1066 is located on one side of the pressing surface 1063a along the axial direction and can limit and support the spring 105. The swinging part 106 can be an integral structure or formed by connecting each part separately. The swinging part 106 can be made of plastic material, with the characteristics of light weight, and can be made of wear-resistant material. Of course, the swinging part 106 can also be made of other materials.

[0047] As Figures 12-16 shown, Figure 12 is Figure 9 a schematic diagram after the control gear 1031 rotates clockwise by a certain angle in [ ], corresponding to the state of the ball valve between fully open and fully closed, corresponding to Figure 14 ; Figure 13 is Figure 12 a schematic diagram after the control gear 1031 rotates clockwise by a certain angle in [ ], corresponding to the fully open state of the ball valve, corresponding to Figure 15 ; Figure 9 corresponding to the fully closed state of the ball valve, that is, corresponding to Figure 2 ; Figure 14 is Figure 2 a schematic diagram of the ball valve in the state between fully open and fully closed in [ ], with an opening degree of approximately 50%; Figure 15 is Figure 2 a schematic diagram of the ball valve running to the fully open state in [ ].

[0048] As Figure 9 shown, the direction in which the spring 105 presses against the swinging part 106 is away from the control gear 1031. The first control wall 1031b is to push the swinging part 106 closer to the control gear 1031. In this way, the first control wall 1031b of the first end groove section 1031p will drive the swinging part 106 to overcome the elastic force of the spring 105 and release the contact 1091 of the touch switch 109 to disconnect the control circuit of the motor 104, and the motor 104 will no longer rotate, and the control gear 1031 will remain in this position, that is, remain in the position where the ball valve is fully closed; similarly, when the control gear 1031 rotates counterclockwise until the second control wall 1031c contacts the swinging part 106, the second control wall 1031c will also push the swinging part 106 to release the touch switch 109, as Figure 13As shown, the ball valve is kept in the fully open position.

[0049] The swinging portion 106 is not limited to pressing or releasing the touch switch 109 by cooperating with the groove portion 1031d on the control gear 1031. For example, two mating surfaces are provided on the swinging portion 106, and the axial heights of the mating surfaces and the first mating portion and the second mating portion have at least partial overlap. When the first mating portion of the control gear 1031 rotates to the mating surface, it contacts and cooperates with the mating surface to pull or push the swinging portion 106 to overcome the elastic force of the spring 105 and release the touch switch 109. When it rotates to the position beyond the mating surface, there is an axial height difference between the first mating portion, the second mating portion and the swinging portion 106, and the swinging portion 106 can pass over the swinging portion 106. Then, the swinging portion 106 can continuously press the touch switch 109 under the action of the spring 105, that is, as long as the swinging portion 106 can cooperate with the first mating portion and the second mating portion to release the touch switch 109, it will be sufficient.

[0050] It can be seen that the valve core ball 301 is configured as follows: when the connector of the swing part 106 is located in the first end groove section 1031p, the valve core ball 301 is in the fully closed position, the control circuit of the motor 104 is disconnected, the motor 104 is turned off, and the valve core ball 301 can be maintained in the fully closed position; when the connector of the swing part 106 is in the second end groove section 1031q, the valve core ball 301 is in the fully open position, the control circuit of the motor 104 is also disconnected, the motor 104 is turned off, and the valve core ball 301 can be maintained in the fully open position; when the connector of the swing part 106 is in the arc groove section 1031o, the control circuit of the motor 104 is connected, the motor 104 is turned on, and the motor 104 can drive the valve core ball 301 to switch between the fully open and fully closed positions.

[0051] like Figure 16 , 17 As shown, Figure 16 It is a schematic diagram of the control circuit of the electric valve in the embodiment of the present application in two connected states through the first mode; Figure 17 Schematic diagram of the control circuit of the electric valve in the embodiment of the present application in two connected states through the second method.

[0052] The control circuit in this embodiment includes the drive circuit b of the actuator 100 and the external circuit a, that is, the opening and closing of the motor 104 can also be restricted by the external circuit a, so as to be controlled in linkage with other devices. For example, when the electric valve is applied to an electric oven, the external circuit a can be part of the main control circuit of the electric oven, that is, the drive circuit b can be linked with the circuits of other devices in the application scenario.

[0053] As described above, when the plug-in member of the swinging portion 106 is located in the first end slot section 1031p and the second end slot section 1031q, the touch switch 109 is in the released state, the control circuit of the motor 104 is disconnected, and the valve core ball 301 switches from the fully open position to the fully closed position, or when the valve core ball 301 switches from the fully closed position to the fully open position, the motor 104 needs to be started again so that the motor 104 drives the valve core ball 301 to rotate. At this time, the control circuit can be assisted by a delay circuit for control.

[0054] As Figure 16 shown in the left figure state of Figure 12 switching to Figure 13 when Figure 16 in, the delay switch is K2, the touch switch 109 is K1, and a switch S1 is also included. The positive pole of the DC power supply is connected to the negative pole of the motor 104 through K2, the motor 104 rotates clockwise, drives the worm 108 and the gear set 103 to rotate, controls the control gear 1031 to rotate clockwise, and the first control wall 1031b of the first end slot section 1031p of the control gear 1031 disengages from the swinging portion 106. The touch switch K1 is pressed under the action of the spring 105 force, and the touch switch K1 closes; after K2 is connected for a predetermined time, K2 can be disconnected. At this time, K1 has been connected. This predetermined time ensures that the insertion shaft 1062 of the swinging portion 106 enters the arc slot section 1031o. The predetermined time is, for example, 1 second. As Figure 16 shown in the right figure state of

[0055] As Figure 17 shown, when the valve core ball 301 needs to switch from the fully open state to the fully closed state, that is, from Figure 13 switching back to Figure 12 when, the positive pole of the DC power supply is connected to the positive pole of the motor 104 through K2, the motor 104 rotates counterclockwise, drives the worm 108 and the gear set 103 to rotate, controls the control gear 1031 to rotate counterclockwise, and the second control wall 1031c of the second end slot section 1031q of the control gear 1031 disengages from the swinging portion 106. The touch switch 109 is pressed under the action of the spring 105 force, and the touch switch 109 closes; after K2 is connected for a predetermined time, K2 can be disconnected. At this time, K1 has been connected. This predetermined time ensures that the insertion shaft 1062 of the swinging portion 106 enters the arc slot section 1031o. The predetermined time is, for example, 1 second. AsFigure 16 In the right - hand diagram state of , since the swing part 106 is already located in the arc - shaped groove section 1031o at this time and the touch switch 109 is already closed, the control circuit remains in the on - state, and the control gear 1031 can continue to rotate until the first control wall 1031b of the first end - part groove section 1031p of the control gear 1031 overcomes the elastic force of the spring 105 to release the touch switch 109 by the swing part 106. When the touch switch 109 is turned off, the control gear 1031 drives the valve stem 302 to make the valve core ball 301 in the fully - closed state.

[0056] It can be seen that when this electric valve can be specifically applied to a steam - oven, when the electric valve is opened, air can be blown into the inner cavity of the steam - oven for cooling. When there is no need to blow air into the inner cavity of the steam - oven, the electric valve can be closed. The main control circuit of the steam - oven can be used to control the motor 104.

[0057] Then when the steam - oven needs to open the electric valve to blow air into the inner cavity of the oven for cooling, the positive pole of the DC power supply of the main control circuit of the steam - oven is connected to the negative pole of the motor 104 through K2. After K2 is connected for a predetermined time, K1 is connected;

[0058] When the steam - oven does not need to blow air into the inner cavity of the oven for cooling and closes the electric valve, the positive pole of the DC power supply of the main control circuit of the steam - oven is connected to the positive pole of the motor 104 through K2. After K2 is connected for a predetermined time, K1 is connected.

[0059] Embodiment 2

[0060] Please refer to Figure 18 、 19 , Figure 18 which is a schematic structural diagram of the actuator 100 of the electric valve in the second embodiment of the present application; Figure 19 is Figure 18 a sectional view taken along the line B - B in , corresponding to the fully - closed state of the ball valve at this time; Figure 20 Its Figure 19 is a schematic diagram of the control gear 1031 in .

[0061] The structure of the electric valve in the second embodiment is basically the same as that in the first embodiment. The difference is only that the control gear 1031 in the above - mentioned first embodiment controls the touch switch 109 through the swing part 106, while the control gear 1031 in the second embodiment directly controls the switch. The switch is specifically a micro - switch 109'. The structures that are the same as those in the first embodiment will not be described in detail again.

[0062] Such as Figure 20As shown, the control gear 1031 includes a wheel axle 1031m and a tooth portion 1031g. The wheel axle 1031m is provided with a shaft hole 1031f into which the valve rod 302 can be inserted. The hole wall of the shaft hole 1031f includes two oppositely arranged flat walls for driving connection with the valve rod 302. A circle of engaging teeth is provided on the outer periphery of the tooth portion 1031g. A protruding portion 1031n is provided on one side of the tooth portion 1031g along the axial direction. The protruding portion 1031n can be separately connected to the end face of the tooth portion 1031g, or can be separately connected to the wheel axle 1031m, or can also be Figure 20 connected to both the tooth portion 1031g and the wheel axle 1031m simultaneously as shown. As Figure 19 , 20 shown, the protruding portion 1031n specifically includes an arc segment and arm portions located at both ends of the arc segment, namely a first arm portion 1031k and a second arm portion 1031l. Each arm portion is connected to the outer side wall of the wheel axle 1031m. The outer surface at the connection position of the arm portion and the arc segment forms a control wall, which is defined as a third control wall 1031j and a fourth control wall 1031h respectively. The outer side wall of the arc segment is a second arc wall 1031i. That is, the outer side wall of the protruding portion 1031n includes the second arc wall 1031i and two control walls located at both ends of the second arc wall 1031i. The distance between the control wall and the axis of the control gear 1031 is d1 (d1 is a range value in this embodiment), and the distance between the second arc wall 1031i and the axis is D1, and it is required that D1 > d1.

[0063] The second arc wall 1031i of the protruding portion 1031n presses against the contact 1091' of the microswitch 109' to turn on the control circuit of the motor 104. When the control gear 1031 rotates, the third control wall 1031j or the fourth control wall 1031h can be rotated to the position of the contact 1091' of the microswitch 109, and the third control wall 1031j or the fourth control wall 1031h will release the contact 1091' of the microswitch 109' to turn off the microswitch 109'. That is, in this embodiment, the first mating portion of the control gear 1031 is the third control wall 1031j, the second mating portion is the fourth control wall 1031h, and the third mating portion is the second arc wall 1031i.

[0064] In this embodiment, two arm portions are provided to achieve connection with the wheel axle 1031m. The protruding portion 1031n is generally in a fan-shaped structure, and there is a gap between the arc segment and the wheel axle 1031m, so as to achieve the purpose of weight reduction. It can be known that the protruding portion 1031n can also be a solid block structure.

[0065] The control circuit of the motor 104 in this embodiment is also understood with reference to Figure 16 , 17 , and the difference is that the switch K1 is the microswitch 109'. The working principle of the electric valve with this structure is as follows:

[0066] When the spool ball 301 needs to be switched from the fully closed state to the fully open state, the positive pole of the DC power supply is connected to the negative pole of the motor 104 through K2. The motor 104 rotates clockwise, driving the worm 108 and the gear set 103 to rotate, controlling the gear 1031 to rotate clockwise, the microswitch 109' and the fourth control wall 1031h move away from each other, and the second arc wall 1031i of the protrusion 1031n of the control gear 1031 begins to press against the contact 1091' of the microswitch 109', and the microswitch 109' closes and is connected; after K2 is connected for a predetermined time, K2 can be disconnected. At this time, K1 has been connected. This predetermined time ensures that the third control wall 1031j can contact and press against the microswitch 109'. The predetermined time is also 1 second for example. When the microswitch 109' is connected, the control circuit of the motor 104 is connected, and the control gear 1031 can continue to rotate until the second arc wall 1031i and the contact 1091' of the microswitch 109' are separated, and the third control wall 1031j of the protrusion 1031n of the control gear 1031 faces the microswitch 109'. At this time, the contact 1091' of the microswitch 109' is released, the microswitch 109' is disconnected, and the control gear 1031 drives the valve stem 302 to make the spool ball 301 in the fully open state.

[0067] When the spool ball 301 needs to be switched from the fully open state to the fully closed state, the positive pole of the DC power supply is connected to the negative pole of the motor 104 through K2. The motor 104 rotates counterclockwise, driving the worm 108 and the gear set 103 to rotate, controlling the gear 1031 to rotate counterclockwise, the microswitch 109' and the third control wall 1031j move away from each other, and the second arc wall 1031i of the protrusion 1031n of the control gear 1031 begins to press against the contact 1091' of the microswitch 109', and the microswitch 109' closes and is connected; after K2 is connected for a predetermined time, K2 can be disconnected. At this time, K1 has been connected. This predetermined time ensures that the second arc wall 1031i can contact and press against the microswitch 109'. The predetermined time is also 1 second for example. When the microswitch 109' is connected, the control circuit of the motor 104 is connected, and the control gear 1031 can continue to rotate until the second arc wall 1031i and the contact 1091' of the microswitch 109' are separated, and the fourth control wall 1031h of the protrusion 1031n of the control gear 1031 faces the microswitch 109'. At this time, the contact 1091' of the microswitch 109' is released, the microswitch 109' is disconnected, and the control gear 1031 drives the valve stem 302 to make the spool ball 301 in the fully closed state.

[0068] The electric valve in the second embodiment can also be applied to a steam oven. The control circuit of the motor 104 includes an external circuit, which is a part of the main control circuit of the steam oven. When the electric valve is opened, air can be blown into the inner cavity of the steam oven for cooling. If there is no need to blow air into the inner cavity of the steam oven, the electric valve can be closed.

[0069] It should be noted that the selected control gear 1031 in the above embodiment is the output gear of the gear set 103. However, it can be understood that the rotation of any gear in the gear set 103 has a corresponding relationship with the opening degree of the ball valve. Therefore, in fact, any gear can be used as the control gear 1031, as long as the corresponding stroke is controlled. However, the output gear is connected to the valve stem 302, and its rotation angle has a direct corresponding relationship with the rotation of the valve core ball 301, which is easier to implement in terms of setting.

[0070] In addition, in this embodiment, the position change of the switch caused by the rotation of the control gear 1031 is used to form different combinations of loosening or pressing with the switch, so as to control the motor 104 to start or stop as required. Only one switch needs to be set, and the cost can be effectively reduced. On this basis, the switch in the first embodiment is the touch switch 109. Compared with the micro switch 109' in the second embodiment, the touch switch 109 has the advantage of low cost. However, since the contact accuracy of the touch switch 109 is very small, that is, the pressing stroke for connection is very small (at the level of less than millimeters), if the control gear 1031 directly presses the touch switch 109, due to errors in processing, assembly, etc., the control gear 1031 may not be pressed in place or pressed too hard. Therefore, when the touch switch 109 is used in the first embodiment of the present application, a swing part 106 is specifically provided for transmission. When connection is required, the spring 105 provides sufficient elastic force to keep the swing part 106 in the position of pressing the touch switch 109 to ensure the reliability of pressing connection. The switch in the second embodiment is the micro switch 109'. Compared with the touch switch 109, the requirement for the pressing stroke is relatively low, and it can be directly controlled by the protruding part 1031n of the control gear 1031. It can be seen that the structures of the micro switch 109' and the touch switch 109 are known technologies, and the embodiments of the present application will not be described in detail.

[0071] In this article, specific examples are used to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. An electric valve, characterized in that, It includes an actuator and a valve body assembly. The valve body assembly includes a valve core and a transmission part. The actuator includes a motor and a gear set. The gear set can drive the transmission part to drive the valve core to act. The actuator further includes a switch for controlling the motor. The gear set includes a control gear. The control gear can abut against or move away from the switch. The control gear is provided with a first control wall and a second control wall. The first control wall and the second control wall are straight walls or curved walls. The actuator further includes a swing part, an elastic part and a housing. The swing part is rotatably connected to the housing. The elastic part presses against the swing part so that the swing part presses the switch. When the control gear rotates to the position where the valve core is fully open, the first control wall cooperates with the swing part to make it overcome the elastic force of the elastic part and disengage from the switch to turn off the motor. When the control gear rotates to the position where the valve core is fully closed, the second control wall cooperates with the swing part to make it overcome the elastic force of the elastic part and disengage from the switch to turn off the motor. When the control gear rotates to a position between fully open and fully closed of the valve core, the switch is turned on and the motor is in a working state.

2. The electric valve according to claim 1, wherein The switch is a touch switch.

3. The electric valve according to claim 2, wherein, The control gear has a groove part. The swing part includes a plug-in part. The plug-in part is inserted into the groove part. The groove part has an arc-shaped groove section. The arc-shaped groove section is coaxially arranged with the control gear. The groove part further includes end groove sections connected to both ends of the arc-shaped groove section. The outer groove wall of one end groove section is the first control wall, and the outer groove wall of the other end groove section is the second control wall. And the distances from the first control wall and the second control wall to the axis of the control gear are both smaller than the distance from the outer groove wall of the arc-shaped groove section to the axis of the control gear.

4. The electric valve according to claim 3, characterized in that The swing part includes a rotating shaft and a plug shaft. The plug shaft is the plug-in part. The swing part further includes a rotating member. One end of the rotating member is connected to the rotating shaft, and the other end of the rotating member is provided with a pressing surface for pressing against the elastic part. The middle part of the rotating member is further provided with a pressing surface for pressing the touch switch. The plug shaft is connected to the rotating member or the rotating shaft.

5. The electric valve according to claim 4, wherein, The swing part further includes a first connecting rod and a second connecting rod. One end of the first connecting rod is connected to the end of the rotating member close to the rotating shaft or connected to the rotating shaft. One end of the second connecting rod is connected to the middle part of the rotating member. The other ends of the first connecting rod and the second connecting rod are both connected to the plug shaft.

6. The electric valve according to claim 5, characterized in that, The rotating member includes a first side surface and a second side surface arranged opposite to each other. The first side surface is closer to the elastic part, and the second side surface is closer to the touch switch. The rotating member is a multi-stage stepped plate. One stepped surface of the first side surface is the pressing surface, and one stepped surface of the second side surface is the pressing surface.

7. The electric valve according to claim 6, characterized in that, The swing part (106) further includes a limiting part (1066). The limiting part (1066) is axially located on one side of the pressing surface (1063a).

8. The electric valve according to claim 3, characterized in that, The groove part is arranged on one end face of the control gear along the axial direction.

9. The electric valve according to claim 8, characterized in that, The control gear (1031) includes a wheel axle (1031m) and a tooth portion (1031g). The groove portion (1031d) is provided on one end face of the tooth portion (1031g) along the axial direction. The groove portion (1031d) is arranged around the wheel axle (1031m). A rib portion (1031e) is connected to the outer peripheral wall of the wheel axle (1031m). The rib portion (1031e) serves as two end walls of the groove portion (1031d), and a part of the outer peripheral wall of the wheel axle (1031m) serves as a part of the wall of the groove portion (1031d).

10. The electric valve according to any one of claims 1-9, characterized in that, The control gear is an output gear at the end of the gear set.

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