Electric stop valve

Abstract

The utility model provides an electric stop valve which comprises a shell structure, a valve element structure, a driving output shaft, a positioning bearing and a limiting ring, a valve port is formed in the shell structure, the valve element structure is arranged in the shell structure, the valve port is opened and closed through rotation of the valve element structure, and the driving output shaft drives the valve element structure to rotate; wherein an outer ring of the positioning bearing is fixed in the shell structure, an inner ring of the positioning bearing is sleeved on the driving output shaft, the limiting ring is mounted on the driving output shaft and is axially limited, and the limiting ring is in limiting fit with one side, facing the valve port, of the inner ring of the positioning bearing. According to the scheme, due to the fact that the outer ring of the positioning bearing is fixed in the shell structure, the side, facing the valve port, of the outer ring of the positioning bearing axially limits the limiting ring, and the limiting ring is matched with the driving output shaft in an axial limiting mode, limiting of the driving output shaft in the direction away from the valve port is achieved; the driving output shaft is prevented from moving in the direction away from the valve port, and the performance of the electric stop valve is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field, specifically, relate to a kind of electric stop valve. BACKGROUND

[0002] Electric stop valve is applied to air conditioning system and other equipment, rotates by driving output shaft and drives valve core structure, and valve core structure actuation realizes the opening and closing of valve port, to realize the on-off of pipeline. Electric stop valve in the related art lacks limiting to the axial direction of driving output shaft, and driving output shaft can move in the direction away from valve port, which affects the normal use of electric stop valve. SUMMARY

[0003] The utility model provides a kind of electric stop valve, to solve the problem that driving output shaft in electric stop valve can move in the direction away from valve port.

[0004] To solve the above problems, the utility model provides an electric stop valve, including shell structure, valve core structure, driving output shaft, locating bearing and limit ring, the valve port is provided in shell structure, valve core structure is arranged in shell structure, and valve core structure is opened and closed valve port by rotation, and driving output shaft drives valve core structure to rotate;Wherein, the outer ring of locating bearing is fixed in shell structure, the inner ring of locating bearing is sleeved on driving output shaft, limit ring is installed on driving output shaft and is axially limited, and the side of limit ring and the inner ring of locating bearing towards valve port is limited cooperation.

[0005] Further, the outer wall of driving output shaft has output shaft limiting surface, and the inner ring of locating bearing is limited cooperation with the side of output shaft limiting surface away from valve port.

[0006] Further, driving output shaft has output shaft limiting slot, and limit ring has notch in circumference, and limit ring is clamped into output shaft limiting slot.

[0007] Further, the electric stop valve further includes pre-tightening sleeve, the pre-tightening sleeve is fixed to the shell structure, the pre-tightening sleeve has an assembly hole, the driving output shaft penetrates the assembly hole, and the pre-tightening sleeve is limited cooperation with the side of limit ring towards valve port.

[0008] Further, the end face of pre-tightening sleeve has pre-tightening limiting slot, and limit ring is located in pre-tightening limiting slot, and limit ring and the bottom wall of pre-tightening limiting slot abut.

[0009] Further, the driving output shaft comprises a first output shaft section, a limiting groove section and a second output shaft section connected in sequence, the outer diameter of the first output shaft section and the outer diameter B of the second output shaft section are both greater than the outer diameter of the limiting groove section, and the output shaft limiting groove is formed between the first output shaft section, the limiting groove section and the second output shaft section; wherein the positioning bearing is sleeved on the first output shaft section, the second output shaft section is inserted into the assembly hole, and the limiting ring can be elastically expanded and contracted in the radial direction to be clamped into the output shaft limiting groove, the diameter of the pre-tightening limiting groove is C, the difference between the outer diameter and the inner diameter of the limiting ring is D, and C>B+D.

[0010] Further, the outer diameter of the first output shaft section is greater than the outer diameter B of the second output shaft section, and the second output shaft section and the inner wall of the assembly hole are in clearance fit.

[0011] Further, the driving output shaft further comprises a third output shaft section connected with the second output shaft section, the outer diameter of the third output shaft section is less than the outer diameter of the second output shaft section, and the outer diameter of the third output shaft section is not greater than the inner diameter of the limiting ring, the connecting portion of the second output shaft section and the third output shaft section has an insertion guide inclined surface, the third output shaft section is inserted into the assembly hole and is in clearance fit with the inner wall of the assembly hole, the valve core structure penetrates into the assembly hole and is in clearance fit with the inner wall of the assembly hole, and the third output shaft section and the valve core structure are in circumferential limiting fit.

[0012] Further, the outer wall of the pre-tightening sleeve is threadedly connected with the inner wall of the shell structure, and the pre-tightening sleeve and the valve core structure are in axial limiting fit.

[0013] Further, the electric shut-off valve further comprises a driving shell, a part of the driving output shaft is located in the driving shell, the shell structure comprises a connecting seat and a valve seat, the valve core structure is installed in the valve seat, and the valve seat and the driving shell are connected with the connecting seat; wherein the outer ring of the positioning bearing is in limiting fit with the valve seat and / or the connecting seat.

[0014] Further, the connecting seat and the valve seat are threadedly connected, and the electric shut-off valve further comprises a valve body sealing ring located between the inner wall of the connecting seat and the outer wall of the valve seat.

[0015] In the scheme, the positioning bearing is arranged in the shell structure, which plays a role of radially limiting the driving output shaft and reducing the rotating resistance. Since the outer ring of the positioning bearing is fixed in the shell structure, the inner ring of the positioning bearing axially limits the limiting ring, and the limiting ring is in axial limiting fit with the driving output shaft, thereby limiting the driving output shaft in the direction away from the valve port, avoiding the driving output shaft from moving in the direction away from the valve port, and ensuring the performance of the electric shut-off valve. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings accompanying the specification provide further understanding of the present application, serve as an example of the embodiments of the present application, and explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0017] Figure 1 A structure schematic view of the electric stop valve provided by the embodiment of the present application is shown;

[0018] Figure 2 A schematic view of the limiting ring in Figure 1 is shown;

[0019] Figure 3 A schematic view of the driving output shaft in Figure 1 is shown;

[0020] Figure 4 A schematic view of the pre-tightening sleeve in Figure 1 is shown;

[0021] Figure 5 A schematic view of the connecting seat in Figure 1 is shown.

[0022] Among them, the above drawings include the following reference signs:

[0023] 130, valve body sealing ring; 140, circumferential limiting member; 150, positioning bearing; 160, thrust bearing;

[0024] 202, valve port; 210, valve seat; 220, pre-tightening sleeve; 221, assembly hole; 224, pre-tightening limiting groove; 240, limiting ring;

[0025] 300, valve core structure;

[0026] 410, driving output shaft; 412, output shaft limiting surface; 413, output shaft limiting groove; 4151, first output shaft section; 4152, limiting groove section; 4153, second output shaft section; 4154, third output shaft section; 4155, insertion guide inclined surface; 440, driving shell; 441, shell limiting surface;

[0027] 500, connecting seat; 501, bottom wall limiting surface; 503, connecting limiting surface;

[0028] 610, pre-tightening nut. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way limiting on the present application and its applications or uses. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0030] As shown in Figures 1 to 5 The embodiment of the present application provides an electric stop valve, which comprises a shell structure, a valve core structure 300, a driving output shaft 410, a positioning bearing 150 and a limiting ring 240. The shell structure is provided with a valve port 202. The valve core structure 300 is arranged in the shell structure. The valve core structure 300 is driven to rotate by the driving output shaft 410. The outer ring of the positioning bearing 150 is fixed in the shell structure. The inner ring of the positioning bearing 150 is sleeved on the driving output shaft 410. The limiting ring 240 is installed on the driving output shaft 410 and axially limited. The limiting ring 240 and the inner ring of the positioning bearing 150 are limited on the side facing the valve port 202.

[0031] In the present scheme, the shell structure is provided with the positioning bearing 150. The positioning bearing 150 plays a role of radially limiting the driving output shaft 410 and reducing the rotating resistance. The outer ring of the positioning bearing 150 is fixed in the shell structure. The inner ring of the positioning bearing 150 is axially limited on the side facing the valve port 202. The limiting ring 240 is axially limited with the driving output shaft 410. Thus, the driving output shaft 410 is limited in the direction away from the valve port 202. The driving output shaft 410 is prevented from moving in the direction away from the valve port 202. The performance of the electric stop valve is ensured.

[0032] As shown in Figure 1 and Figure 3 The outer wall of the driving output shaft 410 has an output shaft limiting surface 412. The output shaft limiting surface 412 and the inner ring of the positioning bearing 150 are limited on the side away from the valve port 202. Thus, the inner ring of the positioning bearing 150 can limit the output shaft limiting surface 412 of the driving output shaft 410 facing the valve port 202. Thus, the driving output shaft 410 is limited in the direction facing the valve port 202. The driving output shaft 410 is prevented from moving in the direction facing the valve port 202.

[0033] As shown in Figure 3As shown, the drive output shaft 410 has an output shaft limiting groove 413, and the limiting ring 240 has a gap in the circumferential direction, and the limiting ring 240 is clamped into the output shaft limiting groove 413. Since the limiting ring 240 has a gap in the circumferential direction, the limiting ring 240 can be expanded under external force, so that the radial dimension of the limiting ring 240 becomes larger, and the drive output shaft 410 is inserted into the limiting ring 240, and after the limiting ring 240 is correspondingly positioned with the output shaft limiting groove 413, the limiting ring 240 is radially retracted, thereby being clamped into the output shaft limiting groove 413, so as to realize the axial limiting of the limiting ring 240 and the drive output shaft 410. In this scheme, the clamping mode is adopted, which is convenient for assembly and disassembly.

[0034] As shown in Figure 1 and Figure 4 The electric shut-off valve further comprises a pre-tightening sleeve 220, which is fixed to the housing structure, and the pre-tightening sleeve 220 has an assembly hole 221, and the drive output shaft 410 is inserted into the assembly hole 221, and the pre-tightening sleeve 220 is limitedly matched with the side of the limiting ring 240 facing the valve port 202.

[0035] The assembly hole 221 on the pre-tightening sleeve 220 can guide and radially limit the drive output shaft 410. By limitingly matching the pre-tightening sleeve 220 with the side of the limiting ring 240 facing the valve port 202, the side of the limiting ring 240 facing the valve port 202 is limited, and the limiting ring 240 is prevented from moving, so as to reliably limit the axial direction of the drive output shaft 410.

[0036] As shown in Figure 4 The end face of the pre-tightening sleeve 220 has a pre-tightening limiting groove 224, and the limiting ring 240 is located in the pre-tightening limiting groove 224, and the limiting ring 240 and the bottom wall of the pre-tightening limiting groove 224 are in abutment. By installing the limiting ring 240 in the pre-tightening limiting groove 224 of the pre-tightening sleeve 220, the limiting ring 240 can be more reliably limited.

[0037] In addition, during assembly, the pre-tightening sleeve 220 and the limiting ring 240 can be installed first, and then the drive output shaft 410 is inserted through the limiting ring 240 and into the pre-tightening sleeve 220. By providing the pre-tightening limiting groove 224, the position of the limiting ring 240 can be accurately defined before the drive output shaft 410 is inserted, which is beneficial to quickly align and connect the drive output shaft 410 and the limiting ring 240.

[0038] Specifically, as shown in Figure 3As shown, the drive output shaft 410 comprises a first output shaft segment 4151, a limiting groove segment 4152 and a second output shaft segment 4153 connected in sequence, the outer diameter of the first output shaft segment 4151 and the outer diameter B of the second output shaft segment 4153 are both greater than the outer diameter of the limiting groove segment 4152, and the output shaft limiting groove 413 is formed between the first output shaft segment 4151, the limiting groove segment 4152 and the second output shaft segment 4153. By arranging the shaft segments with different diameters, the outer diameter of the limiting groove segment 4152 is relatively small, forming the output shaft limiting groove 413 for clamping the limiting ring 240.

[0039] The positioning bearing 150 is sleeved on the first output shaft segment 4151, the second output shaft segment 4153 is inserted into the assembly hole 221, and the limiting ring 240 can be radially elastically expanded to be clamped into the output shaft limiting groove 413. The diameter of the pre-tightening limiting groove 224 is C, the difference between the outer diameter and the inner diameter of the limiting ring 240 is D, and C > B + D.

[0040] Through the above arrangement, the assembly of the positioning bearing 150 and the drive output shaft 410, and the assembly of the drive output shaft 410 and the pre-tightening sleeve 220 are realized. Moreover, the relationship of C > B + D allows the pre-tightening limiting groove 224 to have enough space in the radial direction to accommodate the radial deformation of the limiting ring 240, further allowing the limiting ring 240 to expand to pass through the second output shaft segment 4153, thereby realizing the clamping cooperation with the limiting groove segment 4152.

[0041] Further, the outer diameter of the first output shaft segment 4151 > the outer diameter B of the second output shaft segment 4153, and the second output shaft segment 4153 and the inner wall of the assembly hole 221 are in clearance fit. In this way, the outer diameter of the second output shaft segment 4153 is small, facilitating the second output shaft segment 4153 to pass through the positioning bearing 150 and the limiting ring 240, and the outer diameter of the second output shaft segment 4153 and the inner wall of the assembly hole 221 form a gap, so that the drive output shaft 410 does not generate frictional resistance with the pre-tightening sleeve 220 when rotating.

[0042] Further, the drive output shaft 410 further comprises a third output shaft segment 4154 connected with the second output shaft segment 4153, the outer diameter of the third output shaft segment 4154 < the outer diameter of the second output shaft segment 4153, and the outer diameter of the third output shaft segment 4154 is not greater than the inner diameter of the limiting ring 240. The connection between the second output shaft segment 4153 and the third output shaft segment 4154 has an insertion guide slope 4155, and the third output shaft segment 4154 is inserted into the assembly hole 221 and clearance fits with the inner wall of the assembly hole 221.

[0043] Since the outer diameter of the third output shaft segment 4154 is not greater than the inner diameter of the limiting ring 240, it is convenient to insert the driving output shaft 410 into the limiting ring 240, and the third output shaft segment 4154 is inserted into the assembly hole 221 and is in clearance fit with the inner wall of the assembly hole 221, so that the driving output shaft 410 does not generate frictional resistance with the pre-tightening sleeve 220 when rotating. By setting the insertion guide inclined surface 4155, after contacting the limiting ring 240, the limiting ring 240 can be expanded as the driving output shaft 410 continues to be inserted, so as to facilitate the second output shaft segment 4153 to pass through the limiting ring 240. After the second output shaft segment 4153 passes through the limiting ring 240, the limiting ring 240 corresponds to the limiting groove segment 4152 with a smaller diameter, and the limiting ring 240 shrinks radially to realize the clamping connection with the limiting groove segment 4152.

[0044] The valve core structure 300 is inserted into the assembly hole 221 and is in clearance fit with the inner wall of the assembly hole 221, and the third output shaft segment 4154 and the valve core structure 300 are in circumferential limiting fit, so as to realize the torque transmission of the driving output shaft 410 to the valve core structure 300, and the valve core structure 300 does not contact the inner wall of the assembly hole 221 when rotating, thereby avoiding the generation of frictional resistance and wear.

[0045] As shown in Figure 1 , the outer wall of the pre-tightening sleeve 220 is threadedly connected with the inner wall of the outer shell structure, and the pre-tightening sleeve 220 and the valve core structure 300 are in axial limiting fit. The threaded connection facilitates disassembly and assembly. After the valve core structure 300 is installed, the pre-tightening sleeve 220 is installed to realize the axial limiting of the valve core structure 300, thereby avoiding the internal leakage caused by the poor closing of the valve port 202 due to the axial movement of the valve core structure 300.

[0046] As shown in Figure 1 , the electric shut-off valve further comprises a driving shell 440, a part of the driving output shaft 410 is located in the driving shell 440, and the outer shell structure comprises a connecting seat 500 and a valve seat 210, the valve core structure 300 is installed in the valve seat 210, and the valve seat 210 and the driving shell 440 are connected with the connecting seat 500 respectively; wherein the outer ring of the positioning bearing 150 is in limiting fit with the valve seat 210 and / or the outer ring of the positioning bearing 150 is in limiting fit with the connecting seat 500.

[0047] Through the above setting, the connection of the valve seat 210, the connecting seat 500 and the driving shell 440 is realized, and through the setting of the positioning bearing 150, it is beneficial to keep the driving output shaft 410 and the valve seat 210 in high coaxiality, and the valve core structure 300 is installed in the valve seat 210, so that the driving output shaft 410 and the valve core structure 300 have high coaxiality, so that the torque transmission is stable, and the driving output shaft 410 and the valve core structure 300 do not shake when rotating.

[0048] AsFigure 1 As shown, the connecting seat 500 and the valve seat 210 are threadedly connected, and the threaded connection facilitates disassembly and assembly of the two. The electric shut-off valve further comprises a valve body sealing ring 130 located between the inner wall of the connecting seat 500 and the outer wall of the valve seat 210. In this way, the valve body sealing ring 130 achieves sealing between the inner wall of the connecting seat 500 and the outer wall of the valve seat 210, avoiding leakage at the threaded connection position and improving product reliability.

[0049] The above-mentioned electric shut-off valve can be assembled by the following assembly method:

[0050] S10, the valve core structure 300 and the pre-tightening sleeve 220 are assembled into the valve seat 210;

[0051] S20, the limiting ring 240 and the positioning bearing 150 are assembled into the valve seat 210, and the limiting ring 240 is clamped between the pre-tightening sleeve 220 and the positioning bearing 150, wherein the limiting ring 240 can elastically stretch and contract in the radial direction;

[0052] S30, the drive output shaft 410 is sequentially inserted through the positioning bearing 150, the limiting ring 240, and the pre-tightening sleeve 220, and after the drive output shaft 410 is installed in place, the drive output shaft 410 and the limiting ring 240 are clamped and circumferentially limited with the valve core structure 300.

[0053] In the above method, the pre-tightening sleeve 220 and the positioning bearing 150 achieve axial limiting of the limiting ring 240, and then after the drive output shaft 410 is inserted in place, the limiting ring 240 is clamped with the drive output shaft 410, so that the drive output shaft 410 can be axially limited, preventing axial movement of the drive output shaft 410, and achieving assembly of the drive output shaft 410 and the valve core structure 300. This assembly method is easy to operate and improves operational efficiency.

[0054] Specifically, in S10: the electric shut-off valve further comprises a circumferential limiting piece 140, which is first installed in the valve seat 210, and then the valve core structure 300 is installed, and the circumferential limiting piece 140 is used to limit the rotation range of the valve core structure 300; in this way, the circumferential limiting piece 140 limits the rotation range of the valve core structure 300, so that the valve core structure 300 rotates to the position of closing the valve port 202 or the position of opening the valve port 202 when rotating.

[0055] Optionally, the valve core structure 300 comprises a valve core body, a connecting rod and a valve core sealing block connected in sequence, the valve core body is connected with the driving output shaft 410, and the valve core sealing block has a solid structure and a avoiding gap in the circumferential direction; wherein the valve port 202 is closed when the solid structure of the valve core sealing block corresponds to the valve port 202, and the valve port 202 is opened when the avoiding gap of the valve core sealing block corresponds to the valve port 202. The circumferential limiting piece 140 is in the form of a ring structure and is fixed in the valve seat 210, the inner side of the circumferential limiting piece 140 is provided with a limiting protrusion, the connecting rod passes through the hole of the circumferential limiting piece 140, and the limiting protrusion is located in the rotation path of the connecting rod, wherein when the connecting rod rotates to abut against the limiting protrusion, the limiting protrusion prevents the connecting rod from continuing to rotate, thereby limiting the rotation range of the valve core structure 300. Further, the limiting protrusion is in the form of two, which limits the connecting rod at two different positions to limit the rotation range of the connecting rod.

[0056] In S10, the electric shut-off valve further comprises a thrust bearing 160, the thrust bearing 160 is first sleeved on the valve core structure 300, and then the inner wall of the valve seat 210 and the pre-tightening sleeve 220 are threadedly connected, and the thrust bearing 160 is pressed by the pre-tightening sleeve 220. After the thrust bearing 160 is pressed by the pre-tightening sleeve 220, the thrust bearing 160 abuts against the valve core structure 300, thereby axially limiting the valve core structure 300, and preventing the valve core structure 300 from moving away from the valve port 202 to affect the opening and closing of the valve port 202.

[0057] Further, the electric shut-off valve further comprises a connecting seat 500, and in S20, after the positioning bearing 150 is installed, the connecting seat 500 is installed on the valve seat 210, and the outer ring of the positioning bearing 150 away from the pre-tightening sleeve 220 is limited by the connecting limiting surface 503 on the connecting seat 500. By limiting the positioning bearing 150 through the connecting seat 500, the positioning bearing 150 is prevented from moving away from the valve port 202, so that the positioning bearing 150 can more reliably axially limit the limiting ring 240.

[0058] Further, the electric shut-off valve further comprises a connecting seat 500, a pre-tightening nut 610, a driving housing 440 and a driving assembly installed in the driving housing 440, the driving assembly drives the driving output shaft 410 to rotate, the connecting seat 500 is connected with the valve seat 210, and in S30:

[0059] After the driving output shaft 410 is installed in place, the output shaft limiting surface 412 on the driving output shaft 410 limits the side of the inner ring of the positioning bearing 150 away from the valve port 202, and the end of the driving housing 440 extends into the cavity of the connecting seat 500;

[0060] The pre-tightening nut 610 is sleeved on the driving shell 440 and is screwed with the inner wall of the connecting seat 500, and after the pre-tightening nut 610 is installed in place, the pre-tightening nut 610 presses the shell limiting surface 441 of the driving shell 440, so that the end surface of the driving shell 440 presses the bottom wall limiting surface 501 of the connecting seat 500, thereby fixing the driving shell 440.

[0061] In the above method, the depth of the driving output shaft 410 inserted into the pre-tightening sleeve 220 is limited by the cooperation of the inner ring of the locating bearing 150 and the output shaft limiting surface 412 on the driving output shaft 410, so that the driving output shaft 410 is just clamped with the limiting ring 240 after being inserted into place, thereby realizing accurate assembly.

[0062] The above only describes optional embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0063] It should be noted that the terms used herein are only intended to describe specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a reference to the presence of a feature, step, operation, device, component, and / or combinations thereof.

[0064] The relative arrangement, numerical expressions, and numerical values of the components and steps set forth in the embodiments are not intended to limit the scope of the present application, unless otherwise specified. It should be understood that the sizes of the various parts shown in the drawings are not drawn in proportion. Techniques, methods, and devices known to those skilled in the relevant art can not be discussed in detail, but should be considered as part of the specification where appropriate. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0065] In the description of the present solution, it needs to be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship is generally based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present solution and simplifying the description, without making the opposite statement, these orientation words do not indicate and imply that the device or element indicated must have a particular orientation or be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the scope of protection of the present solution; the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component itself.

[0066] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used herein to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0067] In addition, it needs to be pointed out that the use of "first", "second" and the like to define parts only for the convenience of distinguishing the corresponding parts, and if there is no further declaration, the above words have no special meaning, therefore cannot be understood as a limitation on the scope of protection of the present solution.

Claims

1. An electric shut-off valve, characterized in that The electric cut-off valve comprises a shell structure, a valve core structure (300), a driving output shaft (410), a positioning bearing (150) and a limiting ring (240), the shell structure is internally provided with a valve port (202), the valve core structure (300) is arranged in the shell structure, the valve core structure (300) is arranged to open and close the valve port (202) by rotating, the driving output shaft (410) drives the valve core structure (300) to rotate, the outer ring of the positioning bearing (150) is fixed in the shell structure, the inner ring of the positioning bearing (150) is sleeved on the driving output shaft (410), the limiting ring (240) is installed on the driving output shaft (410) and axially limited, and the limiting ring (240) and the inner ring of the positioning bearing (150) are limitedly matched on the side facing the valve port (202).

2. Motor-operated stop valve according to claim 1, characterized in that The outer wall of the driving output shaft (410) has an output shaft limiting surface (412), and the output shaft limiting surface (412) and the inner ring of the positioning bearing (150) are limitedly matched on the side away from the valve port (202).

3. The motor-operated globe valve of claim 1, wherein The driving output shaft (410) has an output shaft limiting groove (413), and the limiting ring (240) has a notch in the circumferential direction, and the limiting ring (240) is clamped into the output shaft limiting groove (413).

4. The motor-operated globe valve of claim 1, wherein The electric cut-off valve further comprises a pre-tightening sleeve (220), the pre-tightening sleeve (220) is fixed to the shell structure, the pre-tightening sleeve (220) has an assembly hole (221), the driving output shaft (410) penetrates the assembly hole (221), and the pre-tightening sleeve (220) is limitedly matched with the limiting ring (240) on the side facing the valve port (202).

5. The motor-operated globe valve of claim 4, wherein, The end surface of the pre-tightening sleeve (220) has a pre-tightening limiting groove (224), the limiting ring (240) is located in the pre-tightening limiting groove (224), and the limiting ring (240) and the bottom wall of the pre-tightening limiting groove (224) are in abutment.

6. Motor-operated stop valve according to claim 5, characterized in that The driving output shaft (410) comprises a first output shaft section (4151), a limiting groove section (4152) and a second output shaft section (4153) connected in sequence, the outer diameter of the first output shaft section (4151) and the outer diameter B of the second output shaft section (4153) are both greater than the outer diameter of the limiting groove section (4152), and the output shaft limiting groove (413) is formed between the first output shaft section (4151), the limiting groove section (4152) and the second output shaft section (4153); wherein the positioning bearing (150) is sleeved on the first output shaft section (4151), the second output shaft section (4153) is inserted into the assembly hole (221), the limiting ring (240) can be radially elastically stretched to be clamped into the output shaft limiting groove (413), the diameter of the pre-tightening limiting groove (224) is C, the difference between the outer diameter and the inner diameter of the limiting ring (240) is D, and C>B+D.

7. Motor-operated stop valve according to claim 6, characterized in that The outer diameter of the first output shaft section (4151) is greater than the outer diameter B of the second output shaft section (4153), and the second output shaft section (4153) and the inner wall of the assembly hole (221) are in clearance fit.

8. The motor-operated globe valve of claim 6, wherein, The drive output shaft (410) further comprises a third output shaft section (4154) connected with the second output shaft section (4153), the outer diameter of the third output shaft section (4154) is less than the outer diameter of the second output shaft section (4153), and the outer diameter of the third output shaft section (4154) is not greater than the inner diameter of the limiting ring (240), the connection between the second output shaft section (4153) and the third output shaft section (4154) has an insertion guide slope (4155), the third output shaft section (4154) is inserted into the assembly hole (221) and is in clearance fit with the inner wall of the assembly hole (221), the valve core structure (300) penetrates into the assembly hole (221) and is in clearance fit with the inner wall of the assembly hole (221), and the third output shaft section (4154) and the valve core structure (300) are in circumferential limiting fit.

9. The motor-operated globe valve of claim 4, wherein, The outer wall of the pre-tightening sleeve (220) and the inner wall of the shell structure are in threaded connection, and the pre-tightening sleeve (220) and the valve core structure (300) are in axial limiting fit.

10. The motor-operated globe valve of claim 1, wherein The electric shut-off valve further comprises a drive shell (440), a part of the drive output shaft (410) is located in the drive shell (440), the shell structure comprises a connecting seat (500) and a valve seat (210), the valve core structure (300) is installed in the valve seat (210), and the valve seat (210) and the drive shell (440) are connected with the connecting seat (500) respectively; wherein the outer ring of the positioning bearing (150) and the valve seat (210) are in limiting fit, and / or the outer ring of the positioning bearing (150) and the connecting seat (500) are in limiting fit.

11. Motor-operated stop valve according to claim 10, characterized in that The connecting seat (500) and the valve seat (210) are in threaded connection, and the electric shut-off valve further comprises a valve body sealing ring (130), which is located between the inner wall of the connecting seat (500) and the outer wall of the valve seat (210).

Images