An electrically controlled valve

Abstract

The utility model discloses an electric control valve, including valve body, valve seat and ball core, valve body sets up in the upper end of valve seat, is provided with the step motor on the valve body, is equipped with the valve cavity in the valve seat, and the ball core is located in the valve cavity, and with valve cavity rotation cooperation, the lower extreme of rotor is connected with speed reducer, is equipped with output shaft no.

Description

Technical Field

[0001] This utility model relates to the field of valves, and in particular to an electric control valve. Background Technology

[0002] Electric control valves are mainly used in large air conditioning systems to achieve flow path switching or flow path cutoff. They are particularly useful in multi-split systems with independent cooling and heating switching for indoor units. By switching the flow path using electric control valves, the indoor units can independently achieve cooling or heating functions. This function facilitates the recovery of cold or heat. For example, if one room needs cooling and other rooms need heating, an electric control valve is installed in the flow path of each room. By controlling the flow path switching of the valves, the rooms can freely achieve cooling or heating functions. However, traditional multi-split systems can only achieve a uniform cooling or heating mode for each room.

[0003] Chinese patent CN117917520A discloses a solution: the output shaft 30 drives the ball core 3 to rotate, and the vertical pipe and the flow channel formed by 1 are connected at the position shown in the figure. After the ball core rotates 90 degrees, the flow channel formed by 1 and the vertical pipe are closed, and the flow channel formed by the vertical pipe and 1' is connected, which can realize the switching of the flow path from the vertical pipe to 1 and 1'.

[0004] However, the above solution still has drawbacks. First, it cannot cut off both circuits simultaneously; second, the pressure difference generated by the air pressure acts between the ball core and the sealing surface, resulting in a large frictional resistance distance between them. Under high pressure, the sealing block wears significantly, and the valve's operating performance is highly sensitive to pressure, leading to a decrease in high-pressure valve opening performance. To address these issues, a solution is proposed below. Utility Model Content

[0005] The purpose of this invention is to provide an electric control valve that has the advantages of simultaneously sealing two circuits and reducing wear.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: An electric control valve includes a valve body, a valve seat, and a ball core. The valve body is located at the upper end of the valve seat. A stepper motor is mounted on the valve body, with its stator fixed to the outer periphery of the valve body. The rotor of the stepper motor is located within the valve body and rotates with it. A valve cavity is provided within the valve seat, and the ball core is located within the valve cavity and rotates with it. A reducer is connected to the lower end of the rotor, and an output shaft is provided on the reducer. The lower end of the output shaft is connected to the ball core. The valve seat has three valve ports, designated as port A, port B, and port C, each connected to a connecting pipe. The ball core has two interconnected holes. A stop boss is provided on the upper side of the valve seat, and a stop portion is provided at the lower end of the output shaft. The stop portion and the stop boss cooperate to form a stop pair, which restricts the rotation range of the output shaft.

[0007] Preferably, the valve seat is an integral design, and three connecting pipe seats are provided on the valve seat. The three connecting pipe seats are arranged radially along the valve seat, and the three pipes are respectively connected to the three connecting pipe seats. Two of the connecting pipe seats are also provided with sealing blocks.

[0008] Preferably, the sealing block is provided with an elastic element, which is installed on the stepped hole of the corresponding connector seat. The lower end of the elastic element abuts against the end face of the stepped hole, and the upper end abuts against the end face of the sealing block. The outer peripheral surface of the sealing block is also provided with a sealing ring, which forms a seal with the inner peripheral surface of the connector seat.

[0009] Preferably, the valve seat is further provided with a stepped hole, and a bearing is provided in the stepped hole. The output shaft is rotatably connected to the valve seat through the bearing.

[0010] Preferably, the output shaft is an integral design, and the output shaft is also provided with a guide part, a shaped part and a positioning boss. The guide part is located in the stepped hole and is connected to the inner edge of the bearing. The shaped part is inserted into the upper end of the ball core. The positioning boss is located at the lower end of the shaped part and is used for radial positioning of the ball core.

[0011] Preferably, the lower end of the ball core is provided with a positioning hole 1, and a bearing 2 is provided in the positioning hole 1. The bottom of the valve seat is provided with a positioning shaft, and the positioning shaft is rotatably connected to the positioning hole 1 through the bearing 2. The upper end of the ball core is provided with a connecting groove, and a ball core hole is provided in the connecting groove. The irregular part is inserted into the connecting groove, and the positioning boss is inserted into and fixed to the ball core hole.

[0012] Preferably, the first bearing is a deep groove ball bearing, and the second bearing is a needle roller bearing, wherein the needle rollers on the needle roller bearing are provided with a friction-reducing coating.

[0013] The beneficial effects of this utility model are as follows: 1. The ball core is radially supported by bearings. When the ball core seals the valve port, the lateral force on the central hole of the sealing block is borne by the bearings. The pressure difference generated in this area is not applied between the sealing block and the ball core, greatly reducing the force between them. Since this force is borne by the bearings and the support shaft, and the bearings and support shaft experience rolling friction, the frictional resistance torque between the ball core and the sealing block is greatly reduced, improving the rotational reliability of the ball core.

[0014] 2. The output shaft is designed with an integrated design, which integrates the stop boss and the ball core drive structure into one piece. This helps to ensure the relative position of the parts, improve the accuracy of the output shaft rotation angle, and eliminate idle stroke, thereby reducing the error caused by idle stroke.

[0015] 3. The integrated valve seat design reduces the number of parts and welds, while ensuring the positional accuracy of all related parts and improving product reliability.

[0016] 4. With ample installation space, a deep groove ball bearing is chosen to facilitate control over its load-bearing capacity. A needle roller bearing is used at the bottom of the ball core; needle roller bearings have high load-bearing capacity, can be miniaturized, and are embedded in the inner bore of the ball core, simplifying the ball core support mechanism. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment; Figure 2 for Figure 1 Structural cross-sectional view along the BB direction; Figure 3 for Figure 1 Structural cross-sectional view along the AA direction; Figure 4 for Figure 3 Diagram of the sealing pair after the middle rotor rotates by an angle of F / 2; Figure 5 for Figure 3 Diagram of the sealing pair after the rotor rotates by an angle F; Figure 6 for Figure 2 Diagram showing the position of the ball core after the central rotor rotates by an angle of F / 2. Figure 7 for Figure 2 Diagram showing the position of the sphere core after the central rotor rotates by an angle F; Figure 8 for Figure 3 Cross-sectional view of the structure along direction II shown; Figure 9 This is a schematic diagram illustrating the structure of output shaft one in an embodiment; Figure 10 This is a schematic diagram illustrating the structure of the sphere core in an example.

[0018] Reference numerals in the attached drawings: 1. Valve body; 2. Valve seat; 3. Ball core; 4. Stator; 6. Output shaft one; 7. Hole one; 8. Hole two; 9. Stop boss; 10. Stop part; 11. Connecting pipe seat; 12. Sealing block; 13. Elastic element; 14. Sealing ring; 15. Stepped hole one; 16. Bearing one; 17. Guide part; 18. Irregular part; 19. Positioning boss; 20. Fixed gear ring; 21. Bearing two; 22. Positioning shaft; 23. Connecting groove; 24. Ball core hole; 25. Reducer; 26. Valve port A; 27. Valve port B; 28. Valve port C; 29. ​​Connecting pipe A; 30. Connecting pipe B; 31. Connecting pipe C; 32. Positioning hole one. Detailed Implementation

[0019] The following description is merely a preferred embodiment of this utility model, and the scope of protection is not limited to this embodiment. All technical solutions falling within the scope of this utility model's concept should be protected. Identical components are represented by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "bottom" and "top," "inner" and "outer" refer to directions toward or away from the geometric center of a specific component.

[0020] like Figures 1 to 10 As shown, an electrically controlled valve includes a valve body 1, a valve seat 2, and a ball core 3. A stepper motor stator 4 is disposed on the outer periphery of the valve body 1, and a stepper motor rotor is disposed inside the valve body 1. The stepper motor rotor and the stator 4 cooperate to form a stepper motor. To increase torque, a reducer 25 is also provided in this design. The reducer 25 adopts an existing stepper motor reducer. Output shaft 6 is the output shaft of the reducer 25. When the stepper motor stator 4 receives a drive signal, the stepper motor rotor starts to rotate. The torque is increased by reducing speed through the reducer 25 in the middle, and the power is transmitted to the ball core 3 through the output shaft 6 connected to the reducer 25.

[0021] The valve seat 2 has a valve cavity, and the ball core 3 is located inside the valve cavity and rotates with it. The valve seat 2 has three valve ports: port A 26, port B 27, and port C 28. Each of the three ports is connected to a connecting pipe. Connectors B 30 and C 31 are connected to port B 27 and port C 28, respectively, while connector A 29 is connected to port A 26. Connector seats 11 are provided on both port B 27 and port C 28, and these seats are arranged radially along the valve seat 2. A sealing block 12 is provided on the connector seat 11. A sealing ring 14 is also provided on the outer circumferential surface of the sealing block 12, forming a seal between the sealing block 12 and the inner circumferential surface of the connector seat 11.

[0022] Elastic elements 13 are also provided between the connecting pipe seat 11 and the sealing block 12 corresponding to valve port B 27 and valve port C 28. The elastic elements 13 are respectively installed on the stepped hole of the corresponding connecting pipe seat 11. The lower end of the elastic element 13 abuts against the end face of the stepped hole, and the upper end abuts against the end face of the sealing block 12.

[0023] Since the direction of the pre-tightening force of the elastic element 13 on the sealing block 12 is nearly in the same straight line as the sealing direction of the ball core 3 and the sealing block 12, the probability of force transmission causing distortion is reduced, making the seal between the ball core 3 and the sealing block 12 more reliable. At the same time, the axially movable position of the sealing block 12 along the connector seat 11 is only affected by the elastic element 13 and the sealing ring 14, allowing for a larger displacement.

[0024] The ball core 3 has two holes, designated as hole 7 and hole 8. The remaining portion of the ball core 3 along the same axial direction as holes 7 and 8 forms the sealing part of the ball core 3. Holes 7 and 8 are interconnected. In this design, the rotation range of the ball core 3 is from the initial state where hole 7 is connected to valve port B 27, to the final state where hole 8 is connected to valve port C 28.

[0025] The output shaft 6 is a one-piece design, including a stop part 10, a guide part 17, a shaped part 18, and a positioning boss 19. The guide part 17 is located in a stepped hole 15 on the valve seat 2, and a bearing 16 is installed in the stepped hole 15, which is rotatably connected to the valve seat 2. The upper end of the ball core 3 is provided with a connecting groove 23, and a ball core 3 hole is provided in the connecting groove 23. The rotation of the output shaft 6 drives the ball core 3 to rotate through the shaped structure. The positioning boss 19 is disposed in the ball core 3 hole to position the ball core 3.

[0026] The output shaft 6 can rotate flexibly in the bearing 16. A fixed gear ring 20 is fixed in the stepped hole 15. A shim is provided at the lower end of the fixed gear ring 20. The stop boss 9 is limited between the shim and the bearing 16, allowing the output shaft to move slightly up and down axially.

[0027] A stop boss 9 is provided on the upper side of the valve seat 2. The stop part 10 at the lower end of the output shaft 6 cooperates with the stop boss 9 on the valve seat 2 to form a stop pair. The stop pair limits the rotation range of the output shaft. The rotation range of the output shaft is limited by the stop pair by angle F.

[0028] The lower end of the ball core 3 is provided with a positioning hole 32, and a bearing 21 is provided inside the positioning hole 32. The bottom of the valve seat 2 is provided with a positioning shaft 22, and the positioning shaft 22 is rotatably connected to the positioning hole 32 through the bearing 21.

[0029] The ball core 3 is positioned at its upper and lower ends by positioning bosses 19 and positioning shafts 22, respectively. A bearing 16 connects the output shaft 6 to the valve seat 2. When there is a pressure difference at port B or port C, the lateral force exerted on the ball core 3 by this pressure difference is borne by the positioning bosses 19 and positioning shafts 22 at both ends of the ball core 3, ensuring that the ball core 3 does not move. The bearing 21 and positioning shaft 22 exhibit rolling friction, so even with a large pressure difference, the frictional resistance remains very small. This ensures the ball core 3's flexible rotation.

[0030] The principle of the flow channel switching by rotating the spherical core 3 is as follows: When the coil is in the initial position, valve port B 27 is connected to hole 7 and hole 8 is connected to valve port A 26. Since hole 7 and hole 8 are connected, valve port B 27 is connected to A through the ball core 3 as a bridge. The spherical sealing part of the ball core 3 and valve port C 28 form a seal.

[0031] At this time, the stop boss 9 of valve seat 2 abuts against the stop part 10 of output shaft 6. Valve seat 2 is provided with two stop bosses 9, and output shaft is provided with two stop parts 10. The stop bosses 9 restrict the output shaft from rotating within angle F.

[0032] After the coil is given a drive signal, the ball core 3 rotates. When it rotates clockwise by an angle of F / 2, it rotates to the middle position. At this time, the sealing part of the ball core 3 seals valve port B 27 and valve port C 28, and simultaneously cuts off the flow of pipes B 30 and C 31.

[0033] The ball core 3 continues to rotate to angle F, i.e., the fully open position. Valve port C 28 connects with hole 2 8, and hole 1 7 connects with valve port A 26. Since hole 1 7 connects with hole 2 8, valve port C 28 and valve port A 26 are connected through the ball core 3 as a bridge. The spherical sealing part of the ball core 3 forms a seal with valve port B 27. At this time, the stop boss 9 of valve seat 2 abuts against the stop part 10 of output shaft 1 6.

[0034] The above specific embodiments further illustrate the technical problems, technical solutions, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An electrically controlled valve, comprising a valve body (1), a valve seat (2), and a ball core (3), characterized in that, The valve body (1) is located at the upper end of the valve seat (2). A stepper motor is mounted on the valve body (1). The stator (4) of the stepper motor is fixed to the outer periphery of the valve body (1). The rotor of the stepper motor is located inside the valve body (1) and rotates with the valve body (1). A valve cavity is provided inside the valve seat (2). The ball core (3) is located inside the valve cavity and rotates with the valve cavity. A reducer is connected to the lower end of the rotor. An output shaft (6) is provided on the reducer. The lower end of the output shaft (6) is connected to the ball core (3). The valve seat (2) has three valve ports, namely valve port A, valve port B and valve port C. Each of the three valve ports is connected to a pipe. The ball core (3) has a hole 1 (7) and a hole 2 (8) which are interconnected. The upper side of the valve seat (2) is provided with a stop boss (9). The lower end of the output shaft 1 (6) is provided with a stop part (10). The stop part (10) and the stop boss (9) cooperate to form a stop pair, which restricts the rotation range of the output shaft.

2. The electric control valve according to claim 1, characterized in that, The valve seat (2) is an integral design. Two connecting pipe seats (11) are provided on the valve seat (2). The two connecting pipe seats (11) are arranged radially along the valve seat (2). The two connecting pipes are respectively located at valve port B and valve port C. Sealing blocks (12) are also provided on the two connecting pipe seats (11).

3. An electrically controlled valve according to claim 2, characterized in that, The sealing block (12) is provided with an elastic element (13), which is installed on the stepped hole of the corresponding connecting pipe seat (11). The lower end of the elastic element (13) abuts against the end face of the stepped hole, and the upper end abuts against the end face of the sealing block (12). The outer peripheral surface of the sealing block (12) is also provided with a sealing ring (14), which forms a seal with the inner peripheral surface of the connecting pipe seat (11).

4. An electrically controlled valve according to claim 2, characterized in that, The valve seat (2) is also provided with a stepped hole (15), and a bearing (16) is provided in the stepped hole (15). The output shaft (6) is rotatably connected to the valve seat (2) through the bearing (16).

5. An electrically controlled valve according to claim 4, characterized in that, The output shaft (6) is an integral design. The output shaft (6) is also provided with a guide (17), a shaped part (18) and a positioning boss (19). The guide (17) is located in the stepped hole (15) and is connected to the inner edge of the bearing (16). The shaped part (18) is inserted into the upper end of the ball core (3). The positioning boss (19) is located at the lower end of the shaped part (18) and is used for radial positioning of the ball core (3).

6. An electrically controlled valve according to claim 5, characterized in that, The lower end of the ball core (3) is provided with a positioning hole (32), and a bearing (21) is provided in the positioning hole (32). The bottom of the valve seat (2) is provided with a positioning shaft (22), and the positioning shaft (22) is rotatably connected to the positioning hole (32) through the bearing (21). The upper end of the ball core (3) is provided with a connecting groove (23), and a ball core (3) hole is provided in the connecting groove (23). The irregular part (18) is inserted into the connecting groove (23), and the positioning boss (19) is inserted into the ball core (3) hole.

7. An electrically controlled valve according to claim 6, characterized in that, The first bearing (16) is a deep groove ball bearing, and the second bearing (21) is a needle roller bearing. The needle rollers on the needle roller bearing are provided with a friction-reducing coating.

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