Electric ball valve

Abstract

The utility model relates to the technical field of valve bodies, in particular to an electric ball valve. The electric ball valve comprises a valve body and an actuator, the actuator comprises a shell, a driving part, a limiting switch assembly and a transmission part, and one end of the transmission part is in transmission connection with a valve rod of the valve body; the other end of the transmission part is in transmission connection with the driving part, and when the transmission part rotates to the first position, the valve body is opened; when the transmission part rotates from the first position to the second position by a preset angle, the valve body is closed, and the transmission part can rotate between the first position and the second position in a reciprocating mode and form an arc-shaped rotating track. The limiting switch assembly is located on the shell, the transmission piece is located beside the limiting switch assembly, and the limiting switch assembly can be triggered when the transmission piece rotates to the first position or the second position. The electric ball valve further comprises a limiting structure used for preventing the transmission part from being separated from the rotating track. The limiting structure can prevent the transmission piece from rotating continuously after the limiting switch assembly breaks down, normal operation of the electric ball valve is guaranteed, and the reliability of the electric ball valve is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of valve bodies, in particular to an electric ball valve. Background Art

[0002] In the fan coil unit assembly of the central air conditioner, an electric ball valve is installed on the pipe of the coil. In the actuator of the electric ball valve, the motor drives the transmission member to rotate synchronously with the valve stem of the valve body, and the valve stem is driven to rotate by the transmission member to control the opening and closing of the valve body, thereby controlling the on-off of the pipe. When the existing electric ball valve switches between the first position and the second position, the transmission member needs to be limited by 90° rotation through the limit switch inside the actuator to ensure that the valve body is stable in the first position or the second position. When the limit switch fails, the motor drives the transmission member to rotate continuously, thereby affecting the normal operation of the entire equipment. Utility Model Content

[0003] The utility model aims to provide an electric ball valve to solve the technical problem in the prior art that when a limit switch in the electric ball valve fails, the transmission part keeps rotating, thus affecting the normal operation of the electric ball valve.

[0004] To achieve this purpose, the technical solution adopted by the utility model is:

[0005] An electric ball valve comprises a valve body and an actuator, wherein the actuator comprises a housing, a driving member, a limit switch assembly and a transmission member;

[0006] One end of the transmission member is transmission-connected to the valve stem of the valve body; the other end of the transmission member is transmission-connected to the driving member, when the transmission member rotates to the first position, the valve body is opened; when the transmission member rotates from the first position to the second position by a preset angle, the valve body is closed, and the transmission member can reciprocate between the first position and the second position and form an arc-shaped rotation trajectory;

[0007] The limit switch assembly is located on the housing, and the limit switch assembly can be triggered when the transmission member rotates to the first position or the second position;

[0008] The electric ball valve also includes a limiting structure for preventing the transmission member from deviating from a rotation track.

[0009] As an optional solution, the central angle of the limiting structure is greater than or equal to 90°.

[0010] As an optional solution, the transmission member includes a main body, a first paddle and a second paddle, the first paddle and the second paddle protrude from the circumference of the main body and are arranged at intervals from each other, and the second paddle is located above the first paddle; one end of the main body is transmission-connected to the valve stem, and the other end of the main body is transmission-connected to the driving member.

[0011] As an optional solution, in order to better cooperate with the limit switch assembly, the side surfaces of the first paddle and the second paddle are both convex arc surfaces.

[0012] As an optional solution, the limit switch assembly includes a first limit switch and a second limit switch arranged in parallel, and the second limit switch is located above the first limit switch.

[0013] As an optional solution, the first paddle cooperates with a first limit switch; the second paddle cooperates with a second limit switch.

[0014] As an optional solution, the limiting structure includes a first blocking column and a second blocking column, and the first blocking column and the second blocking column are respectively arranged on the shell at intervals along the circumference of the main body, and the heights of the first blocking column and the second blocking column are both greater than or equal to the height of the first paddle, and are both less than the height of the second paddle, and the first paddle is located between the first blocking column and the second blocking column.

[0015] As an optional solution, a guide protrusion is provided on the transmission member, and the limiting structure is an arc-shaped limiting groove opened on the shell, and the guide protrusion can be slidably arranged in the limiting groove.

[0016] As an optional solution, one end of the guide protrusion is fixed to the bottom surface of the main body, and the limiting groove is provided on the shell surface opposite to the bottom surface of the main body.

[0017] As an optional solution, an observation port is provided through the shell, and indicator marks showing the opening and closing of the valve body are provided at intervals along the circumference of the transmission member; when the transmission member rotates to the first position or the second position, one of the indicator marks is opposite to the observation port.

[0018] As an optional solution, the preset angle is 90°.

[0019] The beneficial effects of the utility model are:

[0020] The electric ball valve proposed by the utility model limits the transmission member through a limiting structure, so as to limit the transmission member to a first position or a second position, thereby preventing the transmission member from deviating from a rotation trajectory, and effectively preventing the transmission member from continuously rotating after a limit switch component fails, thereby ensuring the normal operation of the electric ball valve and improving the reliability and stability of the electric ball valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the internal structure of the actuator provided in the first embodiment of the utility model;

[0022] Figure 2 This is a front view of the internal structure of the actuator provided in the first embodiment of the utility model;

[0023] Figure 3 It is an exploded schematic diagram of the internal structure of the actuator provided in the second embodiment of the present utility model;

[0024] Figure 4 It is a structural schematic diagram of the transmission member provided in the second embodiment of the present utility model.

[0025] The names and numbers of the components in the figure are as follows:

[0026] 1. Shell; 10. Through hole; 11. Limit groove; 2. Limit switch assembly; 21. First limit switch; 22. Second limit switch; 3. Transmission member; 31. Main body; 321. First paddle; 322. Second paddle; 33. Guide protrusion; 41. First blocking column; 42. Second blocking column. DETAILED DESCRIPTION

[0027] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention are further described below in conjunction with the accompanying drawings and through specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, rather than all of them.

[0028] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0030] In the description of this embodiment, the terms "upper", "lower", "right", "left" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, 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 of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0031] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0032] Embodiment 1

[0033] like Figure 1 and Figure 2 As shown, the electric ball valve includes a valve body and an actuator, and the actuator includes a housing 1, a driving member, a limit switch assembly 2 and a transmission member 3. One end of the transmission member 3 is connected to the valve stem of the valve body, and the other end of the transmission member 3 is connected to the driving member. When the transmission member 3 rotates to the first position, the valve body opens; when the transmission member 3 rotates from the first position to the second position by a preset angle, the valve body closes, and the transmission member 3 can reciprocate between the first position and the second position and form an arc-shaped rotation trajectory. The limit switch assembly 2 is located on the housing 1, and the transmission member 3 is located beside the limit switch assembly 2, and the limit switch assembly 2 can be triggered when the transmission member 3 rotates to the first position or the second position. Specifically, the driving member can drive the transmission member 3 to drive the valve stem to rotate between the first position and the second position. When the limit switch assembly 2 is triggered, the driving member can be controlled to stop driving the transmission member 3. When the transmission member 3 rotates to the first position and the second position, the limit switch assembly 2 can be triggered, so that the transmission member 3 can reliably stay in the first position and the second position. The above-mentioned preset angle is 90°

[0034] Specifically, the valve body is installed in the pipeline, and the driving part is a rotating motor, which has a simple structure and is easy to disassemble and maintain. Figure 1As shown, the limit switch assembly 2 includes a first limit switch 21 and a second limit switch 22 arranged in parallel, the second limit switch 22 is located above the first limit switch 21, and both limit switches are provided with paddles, and the extension directions of the paddles of the two limit switches are opposite. The transmission member 3 includes a main body 31, a first paddle 321 and a second paddle 322, the first paddle 321 and the second paddle 322 protrude from the circumference of the main body 31 and are arranged at intervals from each other, and the second paddle 322 is located above the first paddle 321. One end of the main body 31 is transmission-connected to the valve stem, and the other end of the main body 31 is transmission-connected to the driving member. The first paddle 321 and the second paddle 322 respectively press the contacts on the paddle of a corresponding limit switch to trigger the corresponding limit switch, and control the driving member to stop driving the transmission member 3 to rotate through the limit switch.

[0035] like Figure 1 As shown, the first paddle 321 cooperates with the first limit switch 21, and the second paddle 322 cooperates with the second limit switch 22. When the transmission member 3 rotates to the first position, the first paddle 321 triggers the first limit switch 21 by pressing the contact on the paddle of the first limit switch 21, and the first limit switch 21 controls the driving member to stop, so that the transmission member 3 reliably stays in the first position; when the transmission member 3 rotates to the second position, the second paddle 322 triggers the second limit switch 22 by pressing the contact on the paddle of the second limit switch 22, and the second limit switch 22 controls the driving member to stop, so that the transmission member 3 reliably stays in the second position, so that the valve body opens or closes the pipeline.

[0036] During the operation of the existing electric ball valve, when the limit switch assembly 2 fails, the motor will drive the transmission member 3 to rotate continuously, thereby affecting the normal operation of the entire device.

[0037] In order to solve the above problems, the electric ball valve of this embodiment also includes a limiting structure for preventing the transmission member 3 from deviating from the rotation track. The limiting structure limits the transmission member 3 to prevent the transmission member 3 from deviating from the rotation track, so as to effectively prevent the transmission member 3 from rotating continuously after the limit switch assembly 2 fails, thereby ensuring the normal operation of the electric ball valve and improving the reliability and stability of the electric ball valve. Specifically, the limiting structure can limit the transmission member 3 to the first position or the second position, preventing the transmission member 3 from continuing to rotate, so that the actuator can complete the last switch command issued, so as to effectively prevent the transmission member 3 from rotating continuously after the limit switch assembly 2 fails.

[0038] like Figure 1 and Figure 2As shown, the limit switch assembly 2 includes a first blocking column 41 and a second blocking column 42, which are respectively arranged on the housing 1 along the circumferential direction of the main body 31 at intervals, and the heights of the first blocking column 41 and the second blocking column 42 are both greater than or equal to the height of the first paddle 321, and are both less than the height of the second paddle 322, and the first paddle 321 is located between the first blocking column 41 and the second blocking column 42. That is, when the limit switch assembly 2 fails, one of the first blocking column 41 and the second blocking column 42 can collide with the first paddle 321 and prevent the first paddle 321 from continuing to rotate with the main body 31. Specifically, when the main body 31 rotates to the first position, the first paddle 321 is pressed against the first blocking column 41; when the main body 31 rotates to the second position, the first paddle 321 is pressed against the second blocking column 42.

[0039] In this embodiment, the first paddle 321 originally in the transmission member 3 cooperates with the first blocking column 41 and the second blocking column 42 respectively, and there is no need to add a new structure to the transmission member 3, thereby simplifying the structure of the transmission member 3 and reducing the cost. When the limit switch assembly 2 fails, when the transmission member 3 rotates to the first position or the second position, the first limit switch 21 or the second limit switch 22 cannot be triggered, and the driving member continues to drive the transmission member 3 to rotate. At this time, the first paddle 321 collides with the first blocking column 41 or the second blocking column 42 to prevent the transmission member 3 from continuing to rotate and limit the transmission member 3 to the first position or the second position.

[0040] Furthermore, the portion of the first paddle 321 connected to the main body 31 can be respectively pressed against the first blocking column 41 and the second blocking column 42. The first blocking column 41 and the second blocking column 42 are both arranged at a position closer to the main body 31, so that the portion of the first paddle 321 connected to the main body 31 collides with the two blocking columns, which greatly reduces the moment of the collision force, reduces the impact strength caused to the first paddle 321, avoids the first paddle 321 from being damaged such as fracture, and improves the safety of the transmission member 3.

[0041] like Figure 2 As shown, the center angle of the limiting structure is greater than or equal to 90°. Specifically, the first blocking column 41 and the second blocking column 42 are located on a circle with the rotation center of the main body 31 as the center ( Figure 2On the circumference shown by the dotted line in the middle), the central angle α corresponding to the first blocking column 41 and the second blocking column 42 is preferably 100° to 110°. Since the rotation angle of the transmission member 3 between the first position and the second position is 90°, and the angle of the two blocking columns 4 is slightly greater than 90°. When the limit switch assembly 2 is not faulty, the limit switch assembly 2 controls the drive member to stop driving the transmission member 3 to rotate, and when the transmission member 3 reaches the first position or the second position, it will not collide with one of the blocking columns to ensure the normal operation of the electric ball valve. When the limit switch assembly 2 fails, the transmission member 3 will continue to rotate a smaller angle after rotating to the first position or the second position, so that the first paddle 321 collides and contacts with one of the blocking columns to limit the transmission member 3 to the first position or the second position. At this time, the valve body is still in the previous command state (that is, opening or closing the pipeline) to ensure the normal operation of the electric ball valve. When the central angle α corresponding to the first blocking column 41 and the second blocking column 42 is too large, the transmission member 3 drives the valve stem to rotate too large an angle, which may cause the valve body to be unable to ensure that the pipeline is in a fully open or fully closed state.

[0042] In this embodiment, an observation port is provided through the housing 1, and indicator marks showing the opening and closing of the valve body are provided at intervals along the circumference of the transmission member 3. When the transmission member 3 rotates to the first position or the second position, one of the indicator marks is opposite to the observation port. By providing the observation port, it is convenient for the staff to clearly and intuitively view the opening and closing state of the electric ball valve through the observation port. Specifically, special symbols or numbers can be provided on the circumferential side of the main body 31 to indicate the opening and closing state of the electric ball valve. For example, the words "ON" and "OFF" are provided on the main body 31. When the electric ball valve is in the first position, the valve body opens the pipeline where it is located, and at this time, "ON" is opposite to the observation port; when the electric ball valve is in the second position, the valve body closes the pipeline where it is located, and at this time, "OFF" is opposite to the observation port. Of course, in other embodiments, other characters can also be used for representation, such as numbers, etc., which are not listed one by one here.

[0043] Embodiment 2

[0044] like Figure 3 and Figure 4 As shown, this embodiment proposes an electric ball valve, which has a structure substantially the same as that of the electric ball valve in the first embodiment, with the main difference being that the limiting structure of this embodiment is an arc-shaped limiting groove 11 (such as Figure 3As shown in FIG. 1 , a guide protrusion 33 is further provided on the main body 31 of the transmission member 3. Specifically, the guide protrusion 33 is slidably provided in the limit groove 11. The main body 31 is connected to the valve stem, and the driving member is in transmission connection with the main body 31. The transmission member 3 is limited by the limit structure to limit the transmission member 3 to the first position or the second position, so as to prevent the transmission member 3 from deviating from the rotation track, so as to effectively prevent the transmission member 3 from rotating continuously after the limit switch assembly 2 fails, thereby ensuring the normal operation of the electric ball valve and improving the reliability and stability of the electric ball valve.

[0045] In this embodiment, one end of the guide protrusion 33 is fixed to the bottom surface of the main body 31, and the limit groove 11 is provided on the surface of the housing 1 opposite to the bottom surface of the main body 31. If the limit switch assembly 2 fails, when the main body 31 rotates to the first position, the guide protrusion 33 abuts against one end of the limit groove 11; when the main body 31 rotates to the second position, the guide protrusion 33 abuts against the other end of the limit groove 11, so that the limit structure can limit the transmission member 3 to the first position or the second position, so that the actuator can complete the last switch command issued, so as to effectively prevent the transmission member 3 from rotating continuously after the limit switch assembly 2 fails.

[0046] like Figure 3 and Figure 4 As shown, a through hole 10 is formed through the housing 1, and the main body 31 is rotatably installed in the through hole 10. The valve stem passes through the through hole 10 and is plugged into the main body 31, so that the main body 31 and the valve stem rotate synchronously. When the limit switch assembly 2 fails, the transmission member 3 rotates to the first position or the second position, and the guide protrusion 33 slides in the limit groove 11, the limit switch assembly 2 cannot be triggered, and the driving member continues to drive the transmission member 3 to rotate. At this time, the guide protrusion 33 collides with the inner side wall of one end of the limit groove 11 to prevent the transmission member 3 from continuing to rotate, thereby limiting the transmission member 3 to the first position or the second position.

[0047] like Figure 4As shown, the limit groove 11 is an arc groove and is concentric with the through hole 10. The center angle of the limit groove 11 is preferably 100° to 110°. Since the rotation angle of the transmission member 3 between the first position and the second position is 90°, the center angle of the limit groove 11 of this embodiment is slightly greater than 90°. When the limit switch assembly 2 does not fail, the limit switch assembly 2 controls the driving member to stop driving the transmission member 3. When the transmission member 3 reaches the first position and the second position, the guide protrusion 33 does not collide with the end of the limit groove 11 to ensure that the transmission member 3 is reliably limited to the first position and the second position. When the limit switch assembly 2 fails, the transmission member 3 rotates to the first position or the second position and then continues to rotate a smaller angle, so that the guide protrusion 33 collides with one end of the limit groove 11 to limit the transmission member 3 to the first position or the second position. At this time, the valve body is still in the previous command state (i.e., opening or closing the pipeline) to ensure the normal operation of the electric ball valve. When the central angle corresponding to the limiting groove 11 is too large, the transmission member 3 drives the valve stem to rotate too large an angle, which may cause the valve body to be unable to ensure that the pipeline is in a fully open or fully closed state.

[0048] The above embodiments are only to illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and modifications, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An electric ball valve, comprising a valve body and an actuator, wherein the actuator comprises a housing (1), a driving member, a limit switch assembly (2) and a transmission member (3); One end of the transmission member (3) is transmission-connected to the valve stem of the valve body; the other end of the transmission member (3) is transmission-connected to the driving member; when the transmission member (3) rotates to a first position, the valve body is opened; when the transmission member (3) rotates from the first position to a second position by a preset angle, the valve body is closed; the transmission member (3) can reciprocate between the first position and the second position and form an arc-shaped rotation trajectory; The limit switch assembly (2) is located on the housing (1), and the transmission member (3) can trigger the limit switch assembly (2) when it rotates to the first position or the second position; It is characterized in that The electric ball valve also includes a limiting structure for preventing the transmission member (3) from deviating from a rotation track.

2. The electric ball valve according to claim 1, characterized in that: The central angle of the limiting structure is greater than or equal to 90°.

3. The electric ball valve according to claim 1, characterized in that: The transmission member (3) comprises a main body (31), a first paddle (321) and a second paddle (322); the first paddle (321) and the second paddle (322) protrude from the circumference of the main body (31) and are arranged at intervals from each other, and the second paddle (322) is located above the first paddle (321); one end of the main body (31) is transmission-connected to the valve stem, and the other end of the main body (31) is transmission-connected to the driving member.

4. The electric ball valve according to claim 3, characterized in that: The side surfaces of the first paddle (321) and the second paddle (322) are both outwardly convex arc surfaces.

5. The electric ball valve according to claim 3, characterized in that: The limit switch assembly (2) comprises a first limit switch (21) and a second limit switch (22) which are arranged in parallel, and the second limit switch (22) is located above the first limit switch (21).

6. The electric ball valve according to claim 5, characterized in that: The first paddle (321) cooperates with the first limit switch (21); the second paddle (322) cooperates with the second limit switch (22).

7. The electric ball valve according to claim 3, characterized in that: The limiting structure comprises a first blocking column (41) and a second blocking column (42); the first blocking column (41) and the second blocking column (42) are respectively arranged on the shell (1) at intervals along the circumference of the main body (31); the heights of the first blocking column (41) and the second blocking column (42) are both greater than or equal to the height of the first paddle (321), and are both less than the height of the second paddle (322); the first paddle (321) is located between the first blocking column (41) and the second blocking column (42).

8. The electric ball valve according to claim 3, characterized in that: The transmission member (3) is provided with a guide protrusion (33), the limiting structure is an arc-shaped limiting groove (11) opened on the housing (1), and the guide protrusion (33) is slidably arranged in the limiting groove (11).

9. The electric ball valve according to claim 8, characterized in that: One end of the guide protrusion (33) is fixed to the bottom surface of the main body (31), and the limiting groove (11) is provided on the surface of the shell (1) opposite to the bottom surface of the main body (31).

10. The electric ball valve according to claim 1, characterized in that: An observation port is provided through the shell (1), and indicator marks showing whether the valve body is open or closed are provided at intervals along the circumference of the transmission member (3); when the transmission member (3) rotates to the first position or the second position, one of the indicator marks is opposite to the observation port.

11. The electric ball valve according to claim 1, characterized in that: The preset angle is 90°.

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