Self-locking type clock valve with good sealing performance

Abstract

The utility model discloses a self-locking type clock valve with good sealing performance, which relates to the technical field of clock valves, and comprises a valve body with a feed port and a discharge port; a sealing ring is arranged on the inner wall of the valve body corresponding to the feeding hole; an annular sealing plug is formed at the end, away from the feeding port, of the sealing ring. The valve plate is positioned in the inner cavity of the valve body; an annular groove is formed in the valve plate; an annular cavity is formed in the flexible sealing ring; one end of the flexible sealing ring is embedded in the annular groove, and the other end of the flexible sealing ring protrudes to the outer side of the corresponding annular groove to form an arc-shaped deformation end; the valve plate driving mechanism is in transmission connection with the valve plate; the valve plate can enable the annular sealing plug to be inserted into the annular groove, the annular sealing plug can abut against the arc-shaped deformation end so that the arc-shaped deformation end can be bent and deformed in the reverse direction and can be recessed into the annular groove, and the deformed arc-shaped deformation end internally and externally wraps the insertion end of the annular sealing plug. The sealing structure can effectively prevent powder accumulation and dust accumulation on the sealing area, improves the sealing performance, and can avoid leakage of a conveying medium.

Description

TECHNICAL FIELD

[0001] The utility model relates to clock valve technical field, especially a kind of self-locking clock valve with good sealing performance. BACKGROUND

[0002] Clock valve is used as the medium flow switching device in pipeline, can effectively control the flow direction of medium, widely used in blast furnace coal powder injection and pulverizing system, as dust gas intercepting sealing. Clock valve has the characteristics of compact structure, small footprint, strict air tightness, high reliability. However, when applied to the medium conveying of dust, ash, powder, the sealing surface of existing clock valve is easy to accumulate powder and dust, which leads to poor sealing in valve closing state, and further easy to cause leakage of conveying medium, affecting intercepting effect.

[0003] Therefore, how to provide a self-locking clock valve with good sealing performance, which can effectively prevent powder and dust accumulation on the sealing area, thereby improving the sealing performance to prevent leakage of conveying medium, and is suitable for high-pressure sealing is a problem that needs to be solved by those skilled in the art. SUMMARY

[0004] Therefore, the utility model provides a self-locking clock valve with good sealing performance, which aims to solve the technical problem of poor sealing performance caused by powder and dust accumulation on the sealing surface of the traditional clock valve.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] The utility model provides a self-locking clock valve with good sealing performance, comprising:

[0007] The valve body has a feed inlet and a discharge outlet; the inner wall of the valve body is provided with a sealing ring corresponding to the feed inlet; the ring hole of the sealing ring is in sealing butt joint and communication with the feed inlet; the end of the sealing ring away from the feed inlet is formed with an annular sealing plug;

[0008] The valve plate is located in the inner cavity of the valve body; the valve plate has an annular groove on the plate surface;

[0009] The flexible sealing ring has an annular cavity extending in the circumferential direction in the inside; the annular cavity is filled with air; one end of the flexible sealing ring is coaxially embedded in the annular groove, and the other end has arc chamfer on the inside and outside and protrudes to the outside of the notch corresponding to the annular groove, to form an arc-shaped deformation end;

[0010] A valve plate driving mechanism is mounted on the valve body and is drivingly connected to the valve plate to drive the valve plate to swing; when the swinging valve plate reaches a blocking position, the annular sealing plug can be coaxially inserted into the annular groove, and the annular sealing plug can press against the arc-shaped deformation end during the insertion into the annular groove, so that the arc-shaped deformation end is reversely bent and deformed and recessed into the annular groove, and the deformed arc-shaped deformation end wraps the insertion end of the annular sealing plug.

[0011] The valve plate driving mechanism can drive the valve plate to swing to open and close the feed inlet; the cooperation of the sealing ring, the flexible sealing ring and the annular groove can realize effective closure of the feed inlet; when the valve plate does not block the feed inlet, the arc-shaped deformation end of the flexible sealing ring protrudes to the outside of the annular groove, and the protruding arc-shaped end face can effectively prevent particles such as dust from adhering, thereby avoiding the presence of dust particles between the contact surfaces during the process of the annular sealing plug contacting and pressing the arc-shaped deformation end; when the valve plate reaches the blocking position, the annular sealing plug is inserted into the annular groove, the arc-shaped deformation end is reversely bent and recessed into the annular groove, and wraps the insertion end of the annular sealing plug, thereby increasing the area of the sealing contact surface, and making the sealing performance more reliable and applicable to high-pressure sealing. Because the air in the annular cavity of the flexible sealing ring is compressed, when the valve plate is opened, the annular sealing plug leaves the annular groove, and under the action of air pressure, the arc-shaped deformation end recessed into the annular groove rebounds and restores to its original state, and the dust particles on the periphery are also bounced away. The utility model can effectively prevent dust from accumulating on the sealing area, thereby improving the sealing performance to avoid leakage of the conveying medium.

[0012] As a further improvement of the above technical solution, the insertion end of the annular sealing plug has arc-shaped chamfers on the inner and outer sides.

[0013] The beneficial effects of the above technical solution are that the insertion end of the annular sealing plug is chamfered to have an arc-shaped head, which can reduce the contact area of the initial contact between the insertion end of the annular sealing plug and the arc-shaped deformation end, and avoid the presence of dust particles between the contact surfaces.

[0014] As a further improvement of the above technical solution, the valve plate driving mechanism includes a valve electric actuator, a transmission shaft assembly and a swing arm.

[0015] The valve electric actuator is located outside the valve body; the valve body is provided with a shaft sleeve penetrating the inside and outside thereof; the transmission shaft assembly is arranged in the shaft sleeve; the driving end of the valve electric actuator is drivingly connected to one end of the transmission shaft assembly to drive the rotation thereof; the other end of the transmission shaft assembly is located in the valve body and is drivingly connected to one end of the swing arm to drive the swing arm to swing; the other end of the swing arm is connected to the valve plate to drive the valve plate to open and close the feed inlet.

[0016] As a further improvement of the above technical solution, the drive motor of the valve electric actuator is a self-locking motor.

[0017] The beneficial effects of the above technical solution are that the self-locking function of the self-locking motor can simply and effectively realize the self-locking of the clock valve.

[0018] As a further improvement of the above technical solution, the transmission shaft assembly comprises a transmission shaft, a sealing sleeve and a bearing;

[0019] The transmission shaft is arranged in the shaft sleeve, and the other end of the transmission shaft is fixedly connected to one end of the swing arm. The drive end of the valve electric actuator is in transmission connection with one end of the transmission shaft to drive the transmission shaft to rotate, thereby driving the swing arm to swing. The bearing is coaxially installed in the shaft sleeve and sleeved on the transmission shaft. The sealing sleeve is coaxially fixed to the outer end of the shaft sleeve and sleeved on the transmission shaft. The sealing sleeve and the shaft sleeve, and the sealing sleeve and the transmission shaft are sealed by a sealing assembly.

[0020] The beneficial effects of the above technical solution are that the sealing sleeve effectively prevents dust and gas in the valve body from leaking from the gap between the shaft sleeve and the transmission shaft.

[0021] As a further improvement of the above technical solution, the sealing assembly comprises a sealing ring one and a sealing ring two. The sealing ring one is sleeved between the outer peripheral wall of the sealing sleeve and the inner peripheral wall of the shaft sleeve. The sealing ring two is sleeved between the inner peripheral wall of the sealing sleeve and the outer peripheral wall of the transmission shaft.

[0022] As a further improvement of the above technical solution, a stabilizing plate is fixed to the other end of the transmission shaft in the valve body, and the other end of the transmission shaft is in rotary connection with the stabilizing plate.

[0023] The beneficial effects of the above technical solution are that the stabilizing plate supports the other end of the transmission shaft to improve the swing positioning accuracy of the valve plate, thereby improving the pressing fit accuracy between the annular sealing plug of the sealing ring and the arc-shaped deformation end of the flexible sealing ring.

[0024] As a further improvement of the above technical solution, the flexible sealing ring is a rubber or silicone sealing ring.

[0025] As a further improvement of the above technical solution, the sealing ring is a steel ring.

[0026] Through the above technical solution, compared with the prior art, the self-locking clock valve with good sealing performance has the following advantages and beneficial effects:

[0027] 1. The utility model discloses a ring seal plug's insertion end and the arc deformation end of flexible seal ring are designed as arc contact surface, effectively avoid the powder, dust of sealing surface, and in order to improve the sealing performance of clock valve, design the flexible seal ring as the structure with annular cavity, make the arc deformation end have the deformation performance of concave-convex, under the cooperation of annular groove, the insertion end of ring seal plug can enter annular groove and be covered inside and outside the arc deformation end of deformation, and good sealing performance is realized, and has the ability of high pressure sealing.

[0028] 2. The utility model discloses the transmission shaft and the shaft sleeve are connected through bearing rotation, and the operation is more flexible, avoids the blockage, realizes the clock valve self -lock through the self -lock type drive motor. And transmission shaft and shaft sleeve are sealed through sealing cover, further improve the sealing performance of valve body, effectively avoid the dust gas leakage in valve body. ACCURATE DRAWINGS

[0029] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, the following will be to the embodiment or prior art description needed to use the drawing briefly introduced, obviously, the drawing in the following description only is the embodiment of the utility model, for the ordinary skilled person in the art comes, under the premise of not paying creative labor, can also obtain other drawings according to the provided drawing.

[0030] Figure 1 The utility model discloses a valve plate closed state structure schematic diagram of self -locking clock valve with good sealing performance;

[0031] Figure 2 The utility model discloses Figure 1 The structure amplification schematic diagram in A place in the utility model;

[0032] Figure 3 The utility model discloses a valve plate open state structure schematic diagram of self -locking clock valve with good sealing performance;

[0033] Figure 4 The utility model discloses Figure 3 The structure amplification schematic diagram in B place in the utility model;

[0034] Figure 5 The utility model discloses a valve plate drive mechanism structure schematic diagram of self -locking clock valve with good sealing performance;

[0035] In the figure: 1, valve body; 11, feed port; 12, discharge port; 13, shaft sleeve; 14, stabilizing plate; 141, shaft seat; 15, annular support plate; 2, valve plate; 21, annular groove; 22, pressing plate groove; 23, pressing plate; 3, flexible sealing ring; 31, annular cavity; 32, arc-shaped deformation end; 4, valve plate driving mechanism; 41, valve electric actuator; 411, driving motor; 42, transmission shaft assembly; 421, transmission shaft; 422, sealing sleeve; 423, bearing; 424, sealing assembly; 4241, sealing ring one; 4242, sealing ring two; 43, swing arm; 5, sealing ring; 51, annular sealing plug; 52, O-shaped sealing ring; 6, bolt; 7, flange plate; 8, blind cover. DETAILED DESCRIPTION

[0036] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary, and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0037] In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0038] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0039] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] According to the embodiment of the utility model, as shown in Figures 1 to 5 A self-locking bell valve with good sealing performance, comprising: a valve body 1, a valve plate 2, a flexible sealing ring 3 and a valve plate driving mechanism 4.

[0041] The valve body 1 has a feed inlet 11 and a discharge outlet 12; the inner wall of the valve body 1 is provided with a sealing ring 5 corresponding to the feed inlet 11; the ring hole of the sealing ring 5 is in sealing butt joint and communication with the feed inlet 11; the end of the sealing ring 5 away from the feed inlet 11 is formed with an annular sealing plug 51.

[0042] The valve plate 2 is located in the inner cavity of the valve body 1; the valve plate 2 has an annular groove 21 on the plate surface.

[0043] The flexible sealing ring 3 has an annular cavity 31 extending in the circumferential direction in the inside; the annular cavity 31 is filled with air; one end of the flexible sealing ring 3 is coaxially embedded in the annular groove 21, and the other end has an arc-shaped chamfer on the inside and outside and protrudes to the outside of the notch corresponding to the annular groove 21 to form an arc-shaped deformation end 32.

[0044] The valve plate driving mechanism 4 is installed on the valve body 1 and is in transmission connection with the valve plate 2 to drive the valve plate 2 to swing; when the swinging valve plate 2 reaches the plugging position, the annular sealing plug 51 can be coaxially inserted into the annular groove 21, and the annular sealing plug 51 can press against the arc-shaped deformation end 32 during the process of being inserted into the annular groove 21, so that the arc-shaped deformation end 32 is reversely bent and deformed and recessed into the annular groove 21, and the deformed arc-shaped deformation end 32 covers the insertion end of the annular sealing plug 51.

[0045] The self-locking bell valve with good sealing performance of the embodiment can drive the valve plate 2 to swing to open and close the feed inlet 11 when in use; the effective closure of the feed inlet 11 can be realized through the cooperation of the sealing ring 5, the flexible sealing ring 3 and the annular groove 21; when the valve plate 2 does not plug the feed inlet 11, the arc-shaped deformation end 32 of the flexible sealing ring 3 protrudes to the outside of the annular groove 21, and the protruding arc-shaped end face can effectively prevent the attachment of dust and other particulate matters, thereby avoiding the retention of dust particles between the contact surfaces during the process that the annular sealing plug 51 contacts and presses against the arc-shaped deformation end 32; when the valve plate 2 reaches the plugging position, the annular sealing plug 51 is inserted into the annular groove 21, the arc-shaped deformation end 32 is reversely bent and recessed into the annular groove 21 and covers the insertion end of the annular sealing plug 51 inside and outside, which improves the area of the sealing contact surface, thereby making the sealing performance more reliable and being applicable to high-pressure sealing. Since the air in the annular cavity 31 of the flexible sealing ring 3 is compressed, when the valve plate 2 is opened, the annular sealing plug 51 leaves the annular groove 21, under the action of air pressure, the arc-shaped deformation end 32 recessed into the annular groove 21 rebounds and restores to the original state, and at the same time, the dust particles on the circumferential side can be bounced away. The utility model can effectively prevent the accumulation of dust on the sealing area, thereby improving the sealing performance to avoid the leakage of the conveying medium.

[0046] Specifically, a ring-shaped support plate 15 is welded to the inner wall of the valve body 1 corresponding to the inlet 11, and the outer peripheral wall of the ring-shaped support plate 15 is welded and sealed to the inner wall of the valve body 1. The sealing ring 5 is coaxially and tightly fastened to the ring-shaped support plate 15 by the bolts 6; the sealing ring 5 is sealed to the opposite wall surface of the ring-shaped support plate 15 by the O-shaped sealing ring 52.

[0047] Specifically, the axial section of the arc-shaped deformation end 32 of the flexible sealing ring 3 is a semicircular arc.

[0048] In some embodiments, the inner and outer sides of the insertion end of the ring-shaped sealing plug 51 are both arc-shaped chamfered.

[0049] The inner and outer sides of the insertion end of the ring-shaped sealing plug 51 are chamfered to be arc-shaped heads, which can reduce the contact area of the insertion end of the ring-shaped sealing plug 51 and the initial contact of the arc-shaped deformation end 32, and avoid dust particles remaining on the contact surface.

[0050] Specifically, the axial section of the insertion end of the ring-shaped sealing plug 51 is a semicircular arc.

[0051] In some embodiments, the ring-shaped groove 21 is a T-shaped groove; a pressure plate groove 22 is formed on the plate surface of the valve plate 2 corresponding to the inner side of the ring-shaped groove 21; the groove depth of the pressure plate groove 22 is smaller than the groove depth of the ring-shaped groove 21; the outer peripheral side of the pressure plate groove 22 is in communication with the inner peripheral side of the ring-shaped groove 21; the flexible sealing ring 3 is T-shaped as a whole, one end of the flexible sealing ring 3 is fitted and embedded in the ring-shaped groove 21, and a ring-shaped pressure plate 23 is fitted and installed in the pressure plate groove 22; the pressure plate 23 fixes the flexible sealing ring 3 in the ring-shaped groove 21, and the pressure plate 23 is fastened to the valve plate 2 by the bolts 6. The flexible sealing ring 3 can be taken out by removing the pressure plate 23 for replacement and maintenance.

[0052] In some embodiments, the valve plate driving mechanism 4 includes a valve electric actuator 41, a transmission shaft assembly 42, and a swing arm 43.

[0053] The valve electric actuator 41 is located outside the valve body 1; the valve body 1 is provided with a shaft sleeve 13 penetrating the inside and outside thereof; the transmission shaft assembly 42 is arranged in the shaft sleeve 13; the driving end of the valve electric actuator 41 is in transmission connection with one end of the transmission shaft assembly 42 to drive the rotation thereof; the other end of the transmission shaft assembly 42 is located inside the valve body 1 and in transmission connection with one end of the swing arm 43 to drive the swing of the swing arm 43; the other end of the swing arm 43 is connected to the valve plate 2 to drive the opening and closing of the inlet 11.

[0054] Specifically, the outer wall of the shaft sleeve 13 is welded and sealed to the valve body 1; or the shaft sleeve 13 is integrally cast and formed with the valve body 1.

[0055] In some embodiments, the driving motor 411 of the valve electric actuator 41 is a self-locking motor.

[0056] The self-locking function of the self-locking motor can be used to simply and effectively realize the self-locking of the clock valve.

[0057] In some embodiments, the transmission shaft assembly 42 comprises a transmission shaft 421, a sealing sleeve 422 and a bearing 423;

[0058] The transmission shaft 421 is arranged through the shaft sleeve 13, and the other end of the transmission shaft 421 is fixedly connected to one end of the swing arm 43. The driving end of the valve electric actuator 41 is in transmission connection with one end of the transmission shaft 421, so as to drive the transmission shaft 421 to rotate, and further drive the swing arm 43 to swing. The bearing 423 is coaxially arranged in the shaft sleeve 13 and sleeved on the transmission shaft 421. The sealing sleeve 422 is coaxially fixed to the outer end of the shaft sleeve 13 and sleeved on the transmission shaft 421. The sealing sleeve 422 and the shaft sleeve 13 and the sealing sleeve 422 and the transmission shaft 421 are sealed by the sealing assembly 424.

[0059] The sealing sleeve 422 effectively prevents dust and gas in the valve body 1 from leaking from the gap between the shaft sleeve 13 and the transmission shaft 421.

[0060] Specifically, one end of the swing arm 43 is sleeved on the transmission shaft 421, and the swing arm 43 and the transmission shaft 421 transmit torque through the spline. The swing arm 43 and the transmission shaft 421 are fastened by screws. The other end of the swing arm 43 is fastened to the middle part of the circular valve plate 2 by the bolt 6. The output shaft of the driving motor 411 is in transmission connection with one end of the transmission shaft 421, so as to control the rotation of the transmission shaft 421. The driving motor 411 can be a servo motor with self-locking function.

[0061] Specifically, one end of the sealing sleeve 422 is adapted to be arranged through the shaft sleeve 13 corresponding to one end of the valve body 1. The sealing sleeve 422 and the shaft sleeve 13 are fastened by screws.

[0062] Specifically, the shaft sleeve 13 has a flange plate 7 coaxially welded and fixed at one end corresponding to the outside of the valve body 1. The housing of the valve electric actuator 41 is fixedly installed on the flange plate 7 by the bolt 6.

[0063] In some embodiments, the sealing assembly 424 comprises a sealing ring one 4241 and a sealing ring two 4242. The sealing ring one 4241 is sleeved between the outer circumferential wall of the sealing sleeve 422 and the inner circumferential wall of the shaft sleeve 13. The sealing ring two 4242 is sleeved between the inner circumferential wall of the sealing sleeve 422 and the outer circumferential wall of the transmission shaft 421.

[0064] In some embodiments, a stabilizing plate 14 is fixed at the other end of the transmission shaft 421 in the valve body 1, and the other end of the transmission shaft 421 is rotatably connected to the stabilizing plate 14.

[0065] The stable plate 14 supports the other end of the transmission shaft 421, so as to improve the swing accuracy of the valve plate 2, and further improve the pressing fit accuracy between the annular sealing plug 51 of the sealing ring 5 and the arc-shaped deformation end 32 of the flexible sealing ring 3.

[0066] Specifically, the stable plate 14 is welded and fixed or integrally connected to the inner wall of the valve body 1; the plate surface of the stable plate 14 is provided with a mounting hole, and the mounting hole is fixed with a shaft seat 141; the other end of the transmission shaft 421 is arranged in and rotatably connected to the inner hole of the shaft seat 141.

[0067] In some embodiments, the flexible sealing ring 3 is a rubber or silicone sealing ring.

[0068] Specifically, the pressure of the air filled in the annular cavity 31 of the flexible sealing ring 3 is greater than or equal to the atmospheric pressure, and after the arc-shaped deformation end 32 of the flexible sealing ring 3 is deformed and recessed into the annular groove 21, the air pressure in the annular cavity 31 increases, and after the annular sealing plug 51 is separated from the arc-shaped deformation end 32, the arc-shaped deformation end 32 can be quickly and elastically restored to be convex under the air pressure in the annular cavity 31, and dust particles adhered to the surface can be bounced off the surface, so that dust adhesion and aggregation are avoided.

[0069] In some embodiments, the sealing ring 5 is a steel ring. The insertion end of the annular sealing plug 51 of the sealing ring 5 is smoothly polished to increase the air tightness.

[0070] In some embodiments, the outer wall of the valve body 1 is provided with a standby material port between the feed port 11 and the discharge port 12, and the standby material port is sealed by a blind cover 8.

[0071] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present specification.

[0072] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and modifications to the above embodiments within the scope of the present application.

Claims

1. A self-locking bell valve having good sealing performance, characterized by comprising: The utility model relates to a valve body (1) has the feed port (11) and the discharge port (12), the inner wall of valve body (1) is equipped with sealing ring (5) corresponding feed port (11) place, the ring hole of sealing ring (5) is sealed and is connected with feed port (11) and communicates, the end of sealing ring (5) away from feed port (11) forms annular sealing plug (51), Valve plate (2) is located in the inner chamber of valve body (1), the valve plate (2) has annular groove (21) on the board face, Flexible sealing ring (3) has annular cavity (31) extending in the circumference in, the annular cavity (31) is filled with air, one end of flexible sealing ring (3) is coaxially embedded in annular groove (21), the other end has arc chamfer and projects to the outside of the notch of corresponding annular groove (21) to constitute arc deformation end (32) inside and outside, Valve plate driving mechanism (4) is installed on valve body (1) and is transmission connected valve plate (2) to drive valve plate (2) swing, when valve plate (2) reaches the plugging position of swing, can make annular sealing plug (51) coaxially insert into annular groove (21), annular sealing plug (51) can press during inserting into annular groove (21) arc deformation end (32) to make arc deformation end (32) reverse bending deformation and recess into annular groove (21), the insertion end of annular sealing plug (51) is covered by deformed arc deformation end (32) inside and outside. The insertion end of annular sealing plug (51) has arc chamfer inside and outside.

2. The self-locking bell valve with good sealing performance according to claim 1, characterized in that, Valve plate driving mechanism (4) includes valve electric actuator (41), transmission shaft assembly (42) and swing arm (43), 3. The self-locking bell valve with good sealing performance according to claim 1, characterized in that, Valve electric actuator (41) is located outside valve body (1), the shaft sleeve (13) is arranged on valve body (1) and penetrates the inside and outside, transmission shaft assembly (42) is arranged on shaft sleeve (13), the drive end of valve electric actuator (41) is transmission connected one end of transmission shaft assembly (42) to drive it to rotate, the other end of transmission shaft assembly (42) is located in valve body (1) and is transmission connected one end of swing arm (43) to drive swing arm (43) swing, the other end of swing arm (43) is connected valve plate (2) to drive valve plate (2) to open and close feed port (11). The drive motor (411) of valve electric actuator (41) is self-locking motor.

4. The self-locking bell valve with good sealing performance according to claim 3, characterized in that, Transmission shaft assembly (42) includes transmission shaft (421), sealing sleeve (422) and bearing (423), 5. The self-locking bell valve with good sealing performance according to claim 3, characterized in that, ​ The transmission shaft (421) is arranged on the shaft sleeve (13), and the other end of the transmission shaft (421) is fixedly connected to one end of the swing arm (43). The driving end of the valve electric actuator (41) is in transmission connection with one end of the transmission shaft (421) to drive the transmission shaft (421) to rotate, and further drive the swing arm (43) to swing. The bearing (423) is coaxially arranged in the shaft sleeve (13) and sleeved on the transmission shaft (421). The sealing sleeve (422) is coaxially fixed to the outer end of the shaft sleeve (13) and sleeved on the transmission shaft (421). The sealing sleeve (422) and the shaft sleeve (13) and the sealing sleeve (422) and the transmission shaft (421) are all sealed by the sealing assembly (424).

6. The self-locking bell valve with good sealing performance according to claim 5, characterized in that, The sealing assembly (424) comprises a sealing ring one (4241) and a sealing ring two (4242). The sealing ring one (4241) is sleeved between the outer peripheral wall of the sealing sleeve (422) and the inner peripheral wall of the shaft sleeve (13). The sealing ring two (4242) is sleeved between the inner peripheral wall of the sealing sleeve (422) and the outer peripheral wall of the transmission shaft (421).

7. The self-locking bell valve with good sealing performance according to claim 5, characterized in that, The valve body (1) is fixed with a stabilizing plate (14) corresponding to the other end of the transmission shaft (421). The other end of the transmission shaft (421) is in rotary connection with the stabilizing plate (14).

8. The self-locking bell valve with good sealing performance according to claim 1, characterized in that, The flexible sealing ring (3) is a rubber or silicone sealing ring.

9. The self-locking bell valve with good sealing performance according to claim 1, characterized in that, The sealing ring (5) is a steel ring.

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