An energy-saving automatic control valve

Abstract

The present invention relates to an energy-saving automatic control valve, including a valve body, a butterfly plate, and a valve shaft; it also includes an upper cover, in which the inner cavity of the upper cover is provided with a piston which divides the upper piston cavity and the lower piston cavity, and in which a driving spring is provided; the upper piston cavity is connected with the left chamber through the left flow channel, and the right flow channel is connected with the right chamber, and a one-way valve is provided at the left flow channel; a valve stem pin is provided in the valve shaft, a driving hole is provided at the bottom of the piston, and a one-way thread is provided on the hole wall of the driving hole; a worm gear is installed on the valve shaft; a motor frame is installed on the valve body and can slide left and right relative to the valve body, and a motor and a worm are installed on the motor frame; a driving structure is used to drive the motor frame to slide left and right; a locking structure is used to lock the motor frame in the first position; a left flow channel control switch is used to control the opening and closing of the left flow channel; a right flow channel control switch is used to control the opening and closing of the right flow channel. It is an energy-saving automatic control valve with a reasonable structure, effective relief of water hammer phenomenon, and no need to match a high-power motor.

Description

Technical Field

[0001] The present invention relates to the field of valve technology, and in particular to an energy-saving automatic control valve which is widely used in multiple industries such as petroleum, chemical industry, water treatment, etc. to adjust the flow of liquid / gas in pipelines. Background Art

[0002] Automatic control valves are widely used in many industries such as petroleum, chemical industry, water treatment, etc. to regulate the flow of liquid / gas in pipelines, switch control, etc. There are various types of automatic control valves. The electric control butterfly valve is a kind of automatic control valve. It can drive the butterfly plate to rotate through the motor-driven valve stem, thereby controlling the opening and closing of the valve port. The electric control butterfly valve is widely used in the fields of petroleum, chemical industry, and natural gas due to its simple structure, large diameter, and convenient control. For example, a Chinese invention patent with patent number ZL 202210937177.9 (publication number CN115325184B) "An electric control butterfly valve with speed regulation function and good sealing and its control method" discloses such an electric control butterfly valve.

[0003] However, when the existing electric-controlled butterfly valve is opened, due to the large pressure difference on both sides of the butterfly plate and the special structure of the electric-controlled butterfly valve, a high torque is required to open the electric-controlled butterfly valve. However, after the electric-controlled butterfly valve is opened, the flow rate is controlled by rotating the butterfly plate, and the required torque is small. Therefore, in order to enable the electric-controlled butterfly valve to be used normally, a large-power motor is required, which will cause a large amount of electric energy waste. At the same time, when the existing electric-controlled butterfly valve is in use, due to its large diameter, a more serious water hammer phenomenon will occur in the pipeline when the electric-controlled butterfly valve is closed, affecting the service life of the system. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an energy-saving automatic control valve with a reasonable structure, which can effectively alleviate the water hammer phenomenon and does not need to be matched with a high-power motor in view of the above-mentioned existing technical status.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: an energy-saving automatic control valve, comprising a valve body with a flow channel, a valve port is arranged in the valve body to divide the flow channel into a left chamber and a right chamber, a butterfly plate for opening and closing the valve port is arranged at the valve port, the butterfly plate is installed on the valve shaft and can rotate with the valve shaft, and the rotation of the butterfly plate controls the opening of the valve port; it is characterized in that: it also includes

[0006] An upper cover with an inner cavity is mounted on the top surface of the valve body, a piston that can only slide up and down is arranged in the inner cavity of the upper cover, the piston divides the inner cavity of the upper cover into an upper piston cavity and a lower piston cavity, a piston push rod on the piston extends upward from the upper cover, and a driving spring that keeps the piston moving upward is arranged in the lower piston cavity; the upper piston cavity is connected with the left chamber through the left flow channel and with the right chamber through the right flow channel, and a one-way valve that only allows the medium to enter the upper piston cavity from the left chamber is arranged at the left flow channel; the valve shaft extends upward into the lower piston cavity, a valve stem pin that is held by a valve stem spring to extend the valve shaft outward is arranged in the valve shaft, a driving hole is opened at the bottom of the piston, a plurality of one-way threads arranged along the circumference are arranged on the hole wall of the driving hole, and a thread chamfer is arranged on the bottom surface of the piston; when the piston moves downward, the valve stem pin can slide upward into the one-way thread along the thread chamfer, and when the piston moves upward, the one-way thread and the extended valve stem pin drive the valve shaft to rotate;

[0007] The worm gear is mounted on the valve shaft and can rotate with the valve shaft;

[0008] The motor frame is mounted on the valve body and can slide left and right relative to the valve body. The motor frame is equipped with a motor and a worm driven to rotate by the motor. The motor frame moves right to a first position to drive the worm to move right and mesh with the worm wheel. The motor frame moves left to a second position to drive the worm to move left and disengage from the worm wheel.

[0009] A driving structure, used to drive the motor frame to slide left and right relative to the valve body;

[0010] A locking structure, used to lock the motor frame in a first position;

[0011] The left flow channel control switch is used to control the opening and closing of the left flow channel;

[0012] The right flow channel control switch is used to control the opening and closing of the right flow channel.

[0013] As a one-way thread structure, each of the one-way threads has a thread bevel and a thread groove surface, and the bottom end of the thread groove surface is provided with the thread chamfer. When the piston moves downward, the valve stem pin is pushed into the thread groove surface through the thread bevel to overcome the inward retraction of the valve stem spring. When the piston moves upward, the valve stem pin is driven by the action of the thread groove surface to drive the valve shaft to rotate, and then the butterfly plate is driven to follow the rotation to partially open the valve port. The lower edge of the piston is conducive to the inward retraction of the valve stem pin, and the thread groove surface will cooperate with the protruding valve stem pin to drive the valve shaft to rotate around its own axis, and the maximum inclination angle of each one-way thread is preferably 45 degrees, so that the upward movement of the piston can at most drive the butterfly plate to open at a small angle.

[0014] Preferably, the driving structure comprises a gate spring, an armature and a first electromagnet, wherein the gate spring is supported between the valve body and the inner wall of the motor frame to keep the motor frame moving to the right, the armature is fixed on one side of the valve body, and the first electromagnet is fixed on the motor frame and arranged opposite to the armature. The gate spring provides a restoring force, and the first electromagnet generates an adsorption force, so that the motor frame can move relative to the valve body, which is more conducive to automatic control. The electromagnet also has the advantages of low cost, stable and reliable operation.

[0015] Preferably, the locking structure includes a positioning hole, a second electromagnet, a positioning pin and a positioning spring. The positioning hole is provided on the valve body. The positioning pin is constrained on the motor frame to slide forward and backward. The positioning spring acts on the positioning pin to keep it extending outward. When the motor frame is in the first position, if the second electromagnet loses power, the positioning pin is inserted into the positioning hole under the action of the positioning spring; if the second electromagnet is energized, the positioning pin is attracted and overcomes the elastic force of the positioning spring to move out of the positioning hole. Whether the positioning pin is inserted into the positioning hole to achieve locking is determined by whether the second electromagnet is energized, which is more conducive to automatic control. The electromagnet also has the advantages of low cost, stable and reliable operation.

[0016] Further improvement, the left flow channel control switch is a first gate plate arranged on the motor frame and can be inserted into the valve body, the first gate plate is provided with a first gate plate hole, when the motor frame is in the first position state, the first gate plate hole is aligned with the left flow channel; when the motor frame is in the second position state, the first gate plate hole is misaligned with the left flow channel, and the first gate plate blocks the left flow channel; the right flow channel control switch is a second gate plate arranged on the motor frame and can be inserted into the valve body, the second gate plate is provided with a second gate plate hole, when the motor frame is in the first position state, the second gate plate hole is misaligned with the right flow channel, and the second gate plate blocks the right flow channel; when the motor frame is in the second position state, the second gate plate hole is aligned with the right flow channel. Both the left flow channel control switch and the right flow channel control switch are associated with the action of the motor frame, and the opening and closing of the corresponding flow channel is realized by the position of the motor frame, and the control is more convenient.

[0017] Since the flow channel spans the valve body and the upper cover, in order to facilitate the molding of the left and right flow channels, preferably, the left flow channel is composed of the first flow channel provided on the valve body and the third flow channel provided on the upper cover; the right flow channel is composed of the second flow channel provided on the valve body and the fourth flow channel provided on the upper cover. Sealing rings are provided between the first flow channel and the third flow channel, and between the second flow channel and the fourth flow channel.

[0018] As a further improvement, an angle sensor is installed at the end of the valve shaft after passing through the valve body. The angle sensor detects the rotation angle of the valve shaft and provides feedback, thereby controlling the opening of the valve port and realizing automatic control of the medium flow.

[0019] In order to ensure that the piston only moves up and down but does not rotate, a vertically arranged sliding rod is fixed in the inner cavity of the upper cover, and the piston is sleeved on the sliding rod and can move up and down along the sliding rod.

[0020] Compared with the prior art, the advantages of the present invention are:

[0021] 1. By setting a piston, when the valve is closed, the medium impact high pressure generated by the water hammer phenomenon can push the piston to move, so that when the present invention is closed, the medium enters the upper piston cavity, thereby reducing the impact of the fluctuating high-pressure medium on the pipeline and alleviating the damage caused by the water hammer phenomenon;

[0022] 2. By setting a piston, when the valve is opened, the flow channel is first controlled to be on and off, so that the driving spring can push the piston to move, and then the valve stem is driven to rotate by the movement of the piston to drive the butterfly plate to rotate and open the valve port, so that the pressure difference on both sides of the butterfly plate is reduced, and then the butterfly plate is controlled to rotate by the motor to adjust the flow rate. Since the torque required for opening the butterfly valve is large, and the torque required for adjusting the flow rate is small, the opening of the butterfly valve of the present invention is completed by the spring pushing the piston transmission, so that the present invention does not need to match a motor with too high power, so as to achieve the purpose of energy saving;

[0023] 3. By setting the piston, the valve can store the hydraulic energy generated by the water hammer phenomenon when it is closed, and release the hydraulic energy when it is opened to drive the valve port to open, so that the wasted energy can be stored and reused to achieve energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a cross-sectional view of the present invention;

[0025] Figure 2 For the present invention Figure 1 Sectional view in the AA direction;

[0026] Figure 3 For the present invention Figure 1 The enlarged image at point I in the middle;

[0027] Figure 4 For the present invention Figure 2 Enlarged view of II in the middle;

[0028] Figure 5 A three-dimensional view of the piston of the present invention;

[0029] Figure 6 It is a three-dimensional cutaway view of the piston of the present invention.

[0030] Valve body 1, left chamber 1a, right chamber 1b, valve port 1c, left flow channel 4a, right flow channel 4b, first flow channel 11, second flow channel 12, positioning hole 13, armature 14, butterfly plate 21, valve shaft 22, worm wheel 31, worm 32, worm frame 33, motor frame 34, first gate plate 341, second gate plate 342, first gate plate hole 343, second gate plate hole 344, gate plate spring 35, upper cover 4, third flow channel 41 , fourth flow channel 42, upper piston chamber 43a, lower piston chamber 43b, one-way valve 44, piston 51, one-way thread 511, thread bevel 5111, thread groove surface 5112, piston push rod 512, thread chamfer 513, slide rod 52, drive spring 53, angle sensor 6, valve stem pin 71, valve stem spring 72, first electromagnet 81, second electromagnet 82, positioning pin 83, positioning spring 84, motor 9. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below with reference to the accompanying drawings.

[0032] As shown in the figure, it is a preferred embodiment of the present invention.

[0033] An energy-saving automatic control valve comprises a valve body 1 having a flow channel. A valve port 1c is arranged in the valve body 1 to divide the flow channel into a left chamber 1a and a right chamber 1b. A butterfly plate 21 for opening and closing the valve port 1c is arranged at the valve port 1c. The butterfly plate 21 is mounted on a valve shaft 22 and can rotate with the valve shaft 22. The rotation of the butterfly plate 21 controls the opening of the valve port 1c.

[0034] The upper cover 4 with an inner cavity is installed on the top surface of the valve body 1. The inner cavity of the upper cover 4 is provided with a piston 51 that can only slide up and down. The piston 51 divides the inner cavity of the upper cover 4 into an upper piston cavity 43a and a lower piston cavity 43b. The piston push rod 512 on the piston 51 extends upward from the upper cover 4. The lower piston cavity 43b is provided with a driving spring 53 that keeps the piston 51 moving upward. A vertically arranged sliding rod 52 is fixed in the inner cavity of the upper cover 4. The piston 51 is sleeved on the sliding rod 52 and can slide along the sliding rod. The rod 52 moves up and down; the upper piston chamber 43a is connected with the left chamber 1a through the left flow channel 4a, and is connected with the right chamber 1b through the right flow channel 4b. A one-way valve 44 is provided at the left flow channel 4a, which only allows the medium to enter the upper piston chamber 43a from the left chamber 1a; the left flow channel 4a is composed of a first flow channel 11 provided on the valve body 1 and a third flow channel 41 provided on the upper cover 4; the right flow channel 4b is composed of a second flow channel 12 provided on the valve body 1 and a fourth flow channel 42 provided on the upper cover 4.

[0035] The valve shaft 22 extends upward into the lower piston chamber 43b, and the end of the valve shaft 22 passes through the valve body 1 and is installed with an angle sensor 6. A valve stem pin 71 is provided in the valve shaft 22, which is supported by a valve stem spring 72 and extends outward from the valve shaft 22. A driving hole is provided at the bottom of the piston 51, and a plurality of one-way threads 511 are provided along the circumference on the hole wall of the driving hole. A thread chamfer 513 is provided on the bottom surface of the piston 51. When the piston 51 moves downward, the valve stem pin 71 can slide upward into the one-way thread 511 along the thread chamfer 513, and when the piston 51 moves upward, the one-way thread 511 and the extended valve stem pin 71 act to drive the valve shaft 22 to rotate. Each of the one-way threads 511 has a thread bevel 5111 and a thread groove 5112. The bottom end of the thread groove 5112 is provided with a thread chamfer 513. The piston 51 moves downward and pushes the valve stem pin 71 through the thread bevel 5111 to overcome the retraction of the valve stem spring 72 and enter the thread groove 5112. The piston 51 moves upward and drives the valve stem pin 71 through the thread groove 5112 to drive the valve shaft 22 to rotate, thereby driving the butterfly plate 21 to follow the rotation and partially open the valve port 1c.

[0036] A worm gear 31 is mounted on the valve shaft 22 and can rotate together with the valve shaft 22;

[0037] The motor frame 34 is a rectangular frame structure, which is mounted on the valve body 1 and can slide left and right relative to the valve body 1. The motor frame 34 is equipped with a motor 9 and a worm 32 driven to rotate by the motor 9. The worm 32 is installed on the worm frame 33. The motor frame 34 moves right to the first position, driving the worm 32 to move right and engage with the worm wheel 31. The motor frame 34 moves left to the second position, driving the worm 32 to move left and disengage from the worm wheel 31.

[0038] The driving structure is used to drive the motor frame 34 to slide left and right relative to the valve body 1; the driving structure includes a gate spring 35, an armature 14 and a first electromagnet 81, the gate spring 35 is supported between the valve body 1 and the inner wall of the motor frame 34 to keep the motor frame 34 moving to the right, the armature 14 is fixed on one side of the valve body 1, and the first electromagnet 81 is fixed on the motor frame 34 and arranged opposite to the armature 14.

[0039] The locking structure is used to lock the motor frame 34 in the first position; the locking structure includes a positioning hole 13, a second electromagnet 82, a positioning pin 83 and a positioning spring 84. The positioning hole is provided on the valve body 1. The positioning pin 83 is constrained on the motor frame 34 to slide forward and backward. The positioning spring 84 acts on the positioning pin 83 to keep it extending outward. When the motor frame 34 is in the first position, if the second electromagnet 82 loses power, the positioning pin 83 is inserted into the positioning hole 13 under the action of the positioning spring 84; if the second electromagnet 82 is energized, the positioning pin 83 is attracted and overcomes the elastic force of the positioning spring 84 to move out of the positioning hole 13.

[0040] The left flow channel control switch is used to control the opening and closing of the left flow channel 4a; the left flow channel control switch is a first gate plate 341 arranged on the motor frame 34 and can be inserted into the valve body 1, and a first gate plate hole 343 is opened on the first gate plate 341. When the motor frame 34 is in the first position, the first gate plate hole 343 is aligned with the left flow channel 4a; when the motor frame 34 is in the second position, the first gate plate hole 343 is misaligned with the left flow channel 4a, and the first gate plate 341 blocks the left flow channel 4a.

[0041] The right flow channel control switch is used to control the opening and closing of the right flow channel 4b. The right flow channel control switch is a second gate plate 342 arranged on the motor frame 34 and can be inserted into the valve body 1. The second gate plate 342 is provided with a second gate plate hole 344. When the motor frame 34 is in the first position, the second gate plate hole 344 is misaligned with the right flow channel 4b, and the second gate plate 342 blocks the right flow channel 4b; when the motor frame 34 is in the second position, the second gate plate hole 344 is aligned with the right flow channel 4b.

[0042] The working principle and process of this energy-saving automatic control valve are as follows:

[0043] like Figure 1 , 3 , 5 and 6, when using the valve, firstly, the valve needs to be connected to the pipeline, the medium is introduced into the pipeline, and then the piston push rod 512 is pressed downward, so that the piston 51 overcomes the driving spring 53 and moves downward, so that the upper piston chamber 43a expands, and then the medium is sucked into the upper piston chamber 43a through the first flow channel 11, the first gate hole 343, the third flow channel 41, and the one-way valve 44, and then the piston push rod 512 is released. Due to the action of the one-way valve 44 and the action of the driving spring 53, the medium pressure in the upper piston chamber 43a increases. At the same time, due to the descending of the piston 51, the valve stem pin 71 enters the one-way thread 511 through the thread chamfer 513, and the valve stem pin 71 is pushed by the thread inclined surface 5111 to overcome the valve stem spring 72 and enter the thread groove surface 5112, completing the preparation work;

[0044] like Figure 2 , 4As shown, when the valve needs to be opened, the first electromagnet 81 and the second electromagnet 82 are energized first, and the second electromagnet 82 attracts the positioning pin 83 to overcome the positioning spring 84 to move, so that the positioning pin 83 exits the positioning hole 13, and the motor frame 34 is unlocked. Then the first electromagnet 81 attracts the armature 14, so that the motor frame 34 overcomes the gate spring 35 and moves to the left, thereby driving the worm 32 to follow the movement, so that the worm 32 and the worm wheel 31 are separated, and the first gate plate 341 and the second gate plate 342 are driven to follow the movement, so that the first gate plate 341 and the second gate plate 342 are driven to follow the movement. The plate hole 343 and the first flow channel 11 are staggered, and the second gate plate 342 is connected to the second flow channel 12. The piston 51 is pushed upward by the driving spring 53, so that the medium in the upper piston chamber 43a is discharged from the right outlet of the valve body 1 through the fourth flow channel 42, the second gate plate hole 344, and the second flow channel 12. Since the piston 51 moves upward along the slide rod 52, the piston 51 cannot rotate. When the piston 51 moves upward, the valve stem pin 71 is driven to drive the valve shaft 22 to rotate through the action of the threaded groove surface 5112, so that The butterfly plate 21 is driven to rotate to open the valve port, and then the motor 9 is started to drive the worm 32 to rotate, and the first electromagnet 81 and the second electromagnet 82 are controlled to be de-energized. Under the action of the gate spring 35, the motor frame 34 is pushed to move rightward, and the worm 32 is driven to move toward the worm wheel 31. Since the worm 32 rotates at this time, the worm wheel 31 and the worm 32 can mesh, and the positioning pin 83 enters the positioning hole 13 under the action of the positioning spring 84, and the positioning frame 34 is locked, and at the same time, the first gate hole 343 and the first flow hole 343 are driven. The second gate plate 342 and the second flow channel 12 are connected, and the second gate plate 342 and the second flow channel 12 are staggered. Due to the effect of the driving spring 53, when the butterfly valve is working normally, the medium pressure in the pipeline is low and will not enter the upper piston chamber 43a, and the piston 51 will not drop. Since the starting motor 9 drives the worm 32 to rotate, the worm wheel 31 is driven to rotate, and the butterfly plate 21 is driven to continue to rotate. At the same time, the angle sensor 6 detects the rotation angle of the valve shaft 22 and provides feedback, so that the opening of the valve port 1c can be controlled to realize automatic control of the medium flow rate;

[0045] When the valve needs to be closed, the worm 32 is driven to rotate by the control motor 9, and then the valve shaft 22 is driven to rotate through the meshing between the worm 32 and the worm wheel 31, and the butterfly plate 21 is controlled to be closed. When the butterfly plate 21 is closed, the medium pressure at the left inlet of the valve body 1 increases due to the water hammer phenomenon, and then the medium enters the upper piston chamber 43a through the first flow channel 11, the first gate hole 343, the third flow channel 41, and the one-way valve 44, pushing the piston 51 to overcome the driving spring 53 and move downward. At the same time, as the piston 51 descends, the valve stem pin 71 enters the one-way thread 511 through the thread chamfer 513, and the valve stem pin 71 is pushed by the thread bevel 5111 to overcome the valve stem spring 72 and enter the thread groove surface 5112, so that the present invention returns to the closed position, and the action forms a cycle;

[0046] Since the pressure generated by the water hammer phenomenon is different each time, and the impact pressure is greater than the working pressure, the distance that the piston 51 descends each time is different. However, when the piston 51 descends to the lowest position, under the structural action of the one-way thread 511, the piston 51 can drive the butterfly plate 21 to rotate 45 degrees after rising, so that when the water hammer does not descend sufficiently, the piston 51 drives the butterfly plate 21 to rotate less than 45 degrees, but is sufficient to drive the butterfly plate 21 to open the valve port 1c. After the valve port 1c is opened, the pressure difference on both sides of the butterfly plate 21 will immediately decrease, so that the torque required for the rotation of the butterfly plate 21 is immediately reduced, so that the piston 51 can complete the valve opening work without descending to the lowest position, which can meet the energy-saving effect.

[0047] It should be noted that in the description of this embodiment, the terms "front, back", "left, right", "inside, outside", "upper, lower" and the like indicating directions or positional relationships are all based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. The terms "install", "connect", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a connection between the insides of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. An energy-saving automatic control valve, comprising a valve body (1) having a flow channel, a valve port (1c) being provided in the valve body (1) to divide the flow channel into a left chamber (1a) and a right chamber (1b), a butterfly plate (21) being provided at the valve port (1c) for opening and closing the valve port (1c), the butterfly plate (21) being mounted on a valve shaft (22) and being capable of rotating with the valve shaft (22), the rotation of the butterfly plate (21) controlling the opening of the valve port (1c); characterized in that: Also includes An upper cover (4) having an inner cavity is mounted on the top surface of the valve body (1); a piston (51) which can only slide up and down is provided in the inner cavity of the upper cover (4); the piston (51) divides the inner cavity of the upper cover (4) into an upper piston cavity (43a) and a lower piston cavity (43b); a piston push rod (512) on the piston (51) extends upward out of the upper cover (4); a driving spring (53) is provided in the lower piston cavity (43b) for keeping the piston (51) moving upward; the upper piston cavity (43a) is connected to the left chamber (1a) through the left flow channel (4a) and is connected to the right chamber (1b) through the right flow channel (4b); a spring is provided at the left flow channel (4a) for only allowing the medium to enter the upper piston cavity from the left chamber (1a); The one-way valve (44) of the plug cavity (43a) is provided; the valve shaft (22) extends upward into the lower piston cavity (43b); a valve stem pin (71) is provided in the valve shaft (22) and is supported by a valve stem spring (72) to extend the valve shaft (22) outward; a driving hole is provided at the bottom of the piston (51); a plurality of one-way threads (511) are provided along the circumference of the hole wall of the driving hole; a thread chamfer (513) is provided on the bottom surface of the piston (51); when the piston (51) moves downward, the valve stem pin (71) can slide upward along the thread chamfer (513) into the one-way thread (511); when the piston (51) moves upward, the one-way thread (511) and the outwardly extending valve stem pin (71) act to drive the valve shaft (22) to rotate; A worm gear (31) is mounted on the valve shaft (22) and can rotate together with the valve shaft (22); A motor frame (34) is mounted on the valve body (1) and can slide left and right relative to the valve body (1). A motor (9) and a worm (32) driven to rotate by the motor (9) are mounted on the motor frame (34). When the motor frame (34) moves right to a first position, the worm (32) moves right and meshes with the worm wheel (31). When the motor frame (34) moves left to a second position, the worm (32) moves left and disengages from the worm wheel (31). A driving structure, used for driving the motor frame (34) to slide left and right relative to the valve body (1); A locking structure, used to lock the motor frame (34) in a first position; A left flow channel control switch, used to control the opening and closing of the left flow channel (4a); The right flow channel control switch is used to control the opening and closing of the right flow channel (4b).

2. The energy-saving automatic control valve according to claim 1 is characterized in that: Each of the one-way threads (511) has a thread bevel (5111) and a thread groove surface (5112). The bottom end of the thread groove surface (5112) is provided with the thread chamfer (513). When the piston (51) moves downward, the valve stem pin (71) is pushed by the thread bevel (5111) to overcome the inward retraction of the valve stem spring (72) and enter the thread groove surface (5112). When the piston (51) moves upward, the valve stem pin (71) is driven by the thread groove surface (5112) to drive the valve shaft (22) to rotate, thereby driving the butterfly plate (21) to follow the rotation and partially open the valve port (1c).

3. The energy-saving automatic control valve according to claim 1 is characterized in that: The driving structure comprises a gate spring (35), an armature (14) and a first electromagnet (81); the gate spring (35) is supported between the valve body (1) and the inner wall of the motor frame (34) so ​​that the motor frame (34) maintains a tendency to move rightward; the armature (14) is fixed to one side of the valve body (1); and the first electromagnet (81) is fixed to the motor frame (34) and is arranged opposite to the armature (14).

4. The energy-saving automatic control valve according to claim 1 is characterized in that: The locking structure comprises a positioning hole (13), a second electromagnet (82), a positioning pin (83) and a positioning spring (84); the positioning hole is arranged on the valve body (1); the positioning pin (83) is constrained on the motor frame (34) so ​​as to be able to slide forward and backward; the positioning spring (84) acts on the positioning pin (83) to keep it extending outward; when the motor frame (34) is in a first position, if the second electromagnet (82) loses power, the positioning pin (83) is inserted into the positioning hole (13) under the action of the positioning spring (84); if the second electromagnet (82) is energized, the positioning pin (83) is attracted and overcomes the elastic force of the positioning spring (84) to move out of the positioning hole (13).

5. The energy-saving automatic control valve according to claim 1 is characterized in that: The left flow channel control switch is a first gate plate (341) arranged on the motor frame (34) and capable of being inserted into the valve body (1); a first gate plate hole (343) is formed on the first gate plate (341); when the motor frame (34) is in a first position, the first gate plate hole (343) is aligned with the left flow channel (4a); when the motor frame (34) is in a second position, the first gate plate hole (343) is misaligned with the left flow channel (4a), and the first gate plate (341) blocks the left flow channel (4a); The right flow channel control switch is a second gate plate (342) arranged on the motor frame (34) and capable of being inserted into the valve body (1); a second gate plate hole (344) is formed on the second gate plate (342); when the motor frame (34) is in a first position, the second gate plate hole (344) is misaligned with the right flow channel (4b), and the second gate plate (342) blocks the right flow channel (4b); when the motor frame (34) is in a second position, the second gate plate hole (344) is aligned with the right flow channel (4b).

6. The energy-saving automatic control valve according to claim 1 is characterized in that: The left flow channel (4a) is composed of a first flow channel (11) provided on the valve body (1) and a third flow channel (41) provided on the upper cover (4) spliced ​​together; the right flow channel (4b) is composed of a second flow channel (12) provided on the valve body (1) and a fourth flow channel (42) provided on the upper cover (4) spliced ​​together.

7. The energy-saving automatic control valve according to claim 1 is characterized in that: An angle sensor (6) is installed on the end of the valve shaft (22) after passing through the valve body (1).

8. The energy-saving automatic control valve according to claim 1 is characterized in that: A vertically arranged sliding rod (52) is fixed in the inner cavity of the upper cover (4), and the piston (51) is sleeved on the sliding rod (52) and can move up and down along the sliding rod (52).

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