Movement assembly and turbine flowmeter

Abstract

The utility model relates to fluid detection technical field discloses a kind of core assembly and turbine flowmeter, core assembly includes: core shell, core main shaft, core bearing and buffer device;Buffer device is fixedly connected with core shell, and buffer device is abutted with the second end of main shaft, buffer device can buffer axial force that core main shaft is received in first direction.When this kind of core assembly is assembled to turbine flowmeter, when the turbine body is impacted momentarily, since the inner ring of core bearing is sleeved on core main shaft, and first bearing is used to connect with turbine body, then along the direction of the first end of main shaft pointing the second end of main shaft, core main shaft and core bearing will receive an axial force;And since buffer device is abutted with the second end of main shaft, and used to buffer axial force that core main shaft is received, can reduce the damage that core bearing receives, to guarantee the service life of core bearing, guarantee the detection accuracy of turbine flowmeter.

Description

Technical Field

[0001] This utility model relates to the field of fluid detection technology, and in particular to a mechanism assembly and a turbine flow meter. Background Technology

[0002] A turbine flow meter is a velocity-type impeller flow measurement instrument. It utilizes the direct proportionality between the rotational angular velocity of the impeller placed in the fluid and the fluid velocity. By measuring the impeller rotational speed, the fluid velocity is obtained, and thus the flow rate in the pipe is obtained.

[0003] During the use of turbine flow meters, especially when the valve is suddenly opened or the gas flow rate changes abruptly, the turbine of the turbine flow meter is subjected to an instantaneous impact force. These axial forces will act on the inner ring of the bearing, causing a certain amount of displacement between the inner and outer rings of the bearing. These bearings are prone to damage under high-speed movement and axial force, which shortens the life of the bearings and greatly reduces the accuracy of the turbine flow meter.

[0004] Therefore, how to ensure the service life of the core bearing in the turbine flow meter, thereby ensuring the detection accuracy of the turbine flow meter, has become a technical problem that urgently needs to be solved in this field. Utility Model Content

[0005] The purpose of this invention is to at least solve the technical problem of how to ensure the service life of the core bearing in a turbine flow meter, thereby ensuring the accuracy of the flow meter's measurement. This objective is achieved through the following technical solution: In a first aspect, this utility model proposes a mechanism assembly suitable for a turbine flow meter. The mechanism assembly includes: a mechanism housing having a mechanism cavity extending along a first direction; a mechanism spindle passing through the mechanism cavity along the first direction, with two ends of the mechanism spindle being a first end and a second end, the first end of the spindle protruding from the outer wall of the mechanism housing and used to connect with the turbine body of the turbine flow meter; a mechanism bearing including a first bearing and a second bearing, the inner ring of the first bearing being fitted onto the mechanism spindle and the outer ring of the first bearing abutting against the inner wall of the mechanism cavity, the inner ring of the second bearing being fitted onto the mechanism spindle and the outer ring of the second bearing abutting against the inner wall of the mechanism cavity, and along the first direction, the first bearing and the second bearing being located at opposite ends of the mechanism cavity, the distance of the first bearing from the first end of the spindle being less than the distance of the second bearing from the first end of the spindle; and a buffer device fixedly connected to the mechanism housing and abutting against the second end of the spindle, the buffer device being configured to buffer the axial force on the mechanism spindle in the first direction.

[0006] When this mechanism assembly is assembled into a turbine flow meter, if the turbine body is subjected to a sudden impact force during operation, the inner rings of both the first and second bearings are fitted onto the main shaft of the mechanism. Since the first bearing is used to connect to the turbine body, the main shaft and the bearings will be subjected to an axial force along the direction from the first end to the second end of the main shaft. Because the buffer device abuts against the second end of the main shaft and is used to buffer the axial force on the main shaft, the damage to the bearings can be greatly reduced, thereby ensuring the service life of the bearings and thus ensuring the detection accuracy of the turbine flow meter.

[0007] In some embodiments of this utility model, along the first direction, one end of the movement housing has a first opening communicating with the movement cavity, and the movement assembly also includes a movement pressure plate for sealing the first opening, a buffer device is fixedly connected to the movement pressure plate, and the movement pressure plate is detachably connected to the movement housing.

[0008] In some embodiments of this utility model, the movement cavity includes a first cavity and a second cavity arranged along a first direction and communicating with each other, the outer ring of the second bearing abuts against the inner wall of the second cavity; the second cavity has a limiting wall, and along the first direction, the first opening is located on the side of the second cavity away from the first cavity, the limiting wall is used to prevent the second bearing from moving away from the first opening.

[0009] In some embodiments of this utility model, the buffer device includes: a guide post body, fixedly connected to the core pressure plate, the interior of the guide post body having a guide post cavity extending along a first direction, and the guide post body having a second opening communicating with the guide post cavity; a ball bearing, abutting against the second end of the main shaft, at least a portion of the ball bearing structure being located within the guide post cavity, the ball bearing being configured to protrude from the guide post cavity through the second opening and to reciprocate along the first direction; and an elastic member, located within the guide post cavity, the elastic member extending along the first direction and capable of stretching and contracting along the first direction, one end of the elastic member being connected to the ball bearing, and the other end of the elastic member being connected to the inner wall of the guide post cavity.

[0010] In some embodiments of this utility model, the guide post body extends along a first direction, and the two ends of the guide post body are a first end of the guide post and a second end of the guide post, respectively, and a second opening is provided at the first end of the guide post.

[0011] In some embodiments of this utility model, the movement plate has a mounting hole extending in a first direction, the mounting hole has an internal thread, the outer wall of the guide post body has an external thread that mates with the internal thread, and the guide post body is threadedly connected to the movement plate.

[0012] In some embodiments of this utility model, the second end of the guide post is provided with an auxiliary assembly hole, which extends along the first direction.

[0013] In some embodiments of this utility model, a preset gap exists between the second bearing and the core pressure plate along the first direction.

[0014] Secondly, this utility model proposes a turbine flow meter, comprising: a flow meter housing; a rear guide fluid installed in the cavity of the flow meter housing; a front guide fluid installed in the cavity of the flow meter housing and fixedly connected to the rear guide fluid; any of the above-mentioned core components, wherein the core housing is installed in the cavity of the rear guide fluid, and the first end of the core shaft protrudes from the cavity of the rear guide fluid; and a turbine body located in the cavity of the flow meter housing and connected to the first end of the core shaft.

[0015] In some embodiments of this utility model, the turbine flow meter further includes a counter assembly, a connecting rod assembly, and a magnetic coupling assembly; the counter assembly is installed on the flow meter housing and is used to record the fluid velocity when the turbine flow meter is working; the magnetic coupling assembly is connected to the main shaft of the mechanism through the connecting rod assembly, and is also connected to the digit wheel of the counter assembly.

[0016] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A cross-sectional view of the movement assembly provided in an embodiment of this utility model; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 A cross-sectional view of the buffer device in the movement assembly provided in this embodiment of the utility model; Figure 4 A cross-sectional view of a turbine flow meter provided in an embodiment of this utility model.

[0018] The attached figures are labeled as follows: 1. Turbine flow meter; 10. Movement components; 100. Movement housing; 101. Movement cavity; 1011. First cavity; 1012. Second cavity; 10121. Limiting wall; 110. Reduction section; 200. Movement spindle; 201. First end of spindle; 202. Second end of spindle; 210. First spindle; 220. Second spindle; 230. Intermediate spindle; 310. First bearing; 320. Second bearing; 400. Movement pressure plate; 401. Mounting hole; 500. Buffer device; 510. Guide post body; 511. First end of guide post; 512. Second end of guide post; 513. Guide post cavity; 514. Auxiliary assembly hole; 520. Ball bearing; 530. Elastic element; 600. Initial gear; a. Preset gap; 20. Flow meter housing; 30. Post-guide fluid; 40. Leading fluid; 50. Turbine body; 60. Counter component; 70. Linkage assembly; 80. Magnetic coupling assembly. Detailed Implementation

[0019] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0020] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0021] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0022] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented as "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0023] Figure 1 A cross-sectional view of the movement assembly provided in an embodiment of this utility model; Figure 2 for Figure 1 Enlarged view of point A in the middle; as shown Figure 1 and Figure 2As shown, this utility model embodiment provides a mechanism assembly 10, suitable for a turbine flow meter 1. The mechanism assembly 10 includes: a mechanism housing 100 having a mechanism cavity 101 extending along a first direction; a mechanism spindle 200 passing through the mechanism cavity 101 along the first direction, with two ends of the mechanism spindle 200 being a first spindle end 201 and a second spindle end 202, the first spindle end 201 protruding from the outer wall of the mechanism housing 100 and used for connection with the turbine body 50 of the turbine flow meter 1; and a mechanism bearing, including a first bearing 310 and a second bearing 320, the inner ring of the first bearing 310 being sleeved on the mechanism spindle 200. The outer ring of the first bearing 310 abuts against the inner wall of the movement cavity 101. The inner ring of the second bearing 320 is sleeved on the movement spindle 200. The outer ring of the second bearing 320 abuts against the inner wall of the movement cavity 101. Along the first direction, the first bearing 310 and the second bearing 320 are located at the two ends of the movement cavity 101, respectively. The distance of the first bearing 310 from the first end 201 of the spindle is less than the distance of the second bearing 320 from the first end 201 of the spindle. A buffer device 500 is fixedly connected to the movement housing 100 and abuts against the second end 202 of the spindle. The buffer device 500 is configured to buffer the axial force on the movement spindle 200 in the first direction.

[0024] In this embodiment, when the core assembly 10 is assembled into the turbine flow meter 1, when the turbine flow meter 1 encounters an instantaneous impact force on the turbine body 50 during operation, since the inner rings of the first bearing 310 and the second bearing 320 are both fitted onto the core spindle 200, and the first bearing 310 is used to connect with the turbine body 50, the core spindle 200 and the core bearing will be subjected to an axial force along the direction from the first end 201 of the main shaft to the second end 202 of the main shaft. Since the buffer device 500 abuts against the second end 202 of the main shaft and is used to buffer the axial force on the core spindle 200, the damage to the core bearing can be greatly reduced, thereby ensuring the service life of the core bearing and thus ensuring the detection accuracy of the turbine flow meter.

[0025] Since the first end 201 of the main shaft is used to connect to the turbine body 50 of the turbine flow meter 1, and the distance between the first bearing 310 and the first end 201 of the main shaft is less than the distance between the second bearing 320 and the first end 201 of the main shaft, it indicates that the first bearing 310 is closer to the first end 201 of the main shaft, and the second bearing 320 is closer to the second end 202 of the main shaft.

[0026] Additionally, refer to Figure 1Along the first direction, the main spindle 200 of the movement may include an intermediate main spindle 230 and a first main spindle 210 and a second main spindle 220 located on both sides of the intermediate main spindle 230. The inner ring of the first bearing 310 is fitted onto the first main spindle 210, and the inner ring of the second bearing 320 is fitted onto the second main spindle 220. It is easy to understand that, in order to facilitate the assembly of the first bearing 310 and the second bearing 320, the diameter of the first main spindle 210 and the diameter of the second main spindle 220 should both be configured to be smaller than the diameter of the intermediate main spindle 230.

[0027] In some embodiments of this utility model, along the first direction, one end of the movement housing 100 has a first opening communicating with the movement cavity 101. The movement assembly 10 also includes a movement pressure plate 400 for sealing the first opening. The buffer device 500 is fixedly connected to the movement pressure plate 400, and the movement pressure plate 400 is detachably connected to the movement housing 100.

[0028] In this embodiment, since the first opening is connected to the movement cavity 101, and some structures in the movement assembly 10 (such as the buffer device 500, the second bearing 320, etc.) need to be assembled into the movement cavity 101, in order to facilitate assembly, the movement pressure plate 400 can be detachably connected to the movement housing 100. For example, the two can be connected by screws, so that the first opening can be switched between the blocked state and the open state, thereby improving the overall assembly efficiency of the movement assembly 10. Moreover, the detachable connection of the movement pressure plate 400 also facilitates subsequent maintenance. It is easy to understand that the screw connection is only an example. In actual working conditions, it is sufficient to ensure that the movement pressure plate 400 can be detachably connected to the movement housing 100. The specific connection method is not limited.

[0029] Please refer to the above. Figure 1 and Figure 2 In some embodiments of this utility model, the movement cavity 101 includes a first cavity 1011 and a second cavity 1012 arranged along a first direction and interconnected with each other. The outer ring of the second bearing 320 abuts against the inner wall of the second cavity 1012. The second cavity 1012 has a limiting wall 10121. Along the first direction, the first opening is located on the side of the second cavity 1012 away from the first cavity 1011. The limiting wall 10121 is used to prevent the second bearing 320 from moving away from the first opening.

[0030] In this embodiment, the limiting wall 10121 effectively limits the second bearing 320, thereby further improving the assembly efficiency of the movement assembly 10.

[0031] Specifically, please refer to Figure 1 and Figure 2When designing the movement housing 100, a reduced diameter section 110 can be provided at the right end of the first cavity 1011, and the right side wall of the reduced diameter section 110 constitutes the limiting wall 10121; that is, the first cavity 1011 and the second cavity 1012 are respectively located on both sides of the reduced diameter section 110, so as to... Figure 2 For example, the second bearing 320 is located on the right side of the reduced diameter portion 110, and the limiting wall 10121 is used to prevent the second bearing 320 from moving to the left.

[0032] Figure 3 A cross-sectional view of the buffer device in the movement assembly provided in this embodiment of the present invention; Reference Figures 1 to 3 In some embodiments of this utility model, the buffer device 500 includes: a guide post body 510, fixedly connected to the core pressure plate 400, the guide post body 510 having a guide post cavity 513 extending along a first direction, and the guide post body 510 having a second opening communicating with the guide post cavity 513; a ball bearing 520 abutting against the second end 202 of the main shaft, at least a portion of the structure of the ball bearing 520 being located within the guide post cavity 513, the ball bearing 520 being configured to protrude from the guide post cavity 513 through the second opening and to reciprocate along the first direction; and an elastic member 530 located within the guide post cavity 513, the elastic member 530 extending along the first direction and capable of stretching and contracting along the first direction, one end of the elastic member 530 being connected to the ball bearing 520, and the other end of the elastic member 530 being connected to the inner wall of the guide post cavity 513.

[0033] In this embodiment, the specific process of the movement assembly 10 buffering the axial force on the movement bearing is described below with reference to the specific structure of the buffer device 500: As can be seen from the above, when this mechanism component 10 is assembled into the turbine flow meter 1, when the turbine flow meter 1 encounters an instantaneous impact force on the turbine body 50 during operation, the mechanism main shaft 200 and the mechanism bearing will be subjected to an axial force in the direction from the first end 201 of the main shaft to the second end 202 of the main shaft. When the main shaft 200 and the bearing are subjected to the aforementioned axial force, the ball bearing 520 abuts against the second end 202 of the main shaft, the two ends of the elastic element 530 are respectively connected to the inner wall of the ball bearing 520 and the guide post cavity 513, and the guide post body 510 is fixedly connected to the main shaft pressure plate 400; therefore, the buffer device 500 as a whole can provide the second end 202 of the main shaft with a force opposite to the aforementioned axial force (the direction of this force is from the second end 202 of the main shaft to the first end 201 of the main shaft), thereby buffering the aforementioned axial force. Therefore, it can significantly reduce the damage to the bearing, thereby ensuring the service life of the bearing and thus ensuring the detection accuracy of the turbine flow meter.

[0034] The two ends of the elastic element 530 can be bonded to the inner wall of the ball 520 and the guide post cavity 513 respectively. The bonding method is simple to operate and has good connection stability.

[0035] In addition, it is easy to understand that the elastic element 530 can be made of rubber or spring, as long as the elastic element 530 can extend along the first direction and can stretch and contract along the first direction. The specific material of the elastic element 530 can be determined according to the actual working conditions and there are no restrictions.

[0036] Continue to refer to Figures 1 to 3 In some embodiments of this utility model, the guide post body 510 extends along a first direction, and the two ends of the guide post body 510 are respectively the first end 511 and the second end 512 of the guide post. The second opening is provided at the first end 511 of the guide post. The movement pressure plate 400 has a mounting hole 401 extending along the first direction. The mounting hole 401 has an internal thread, and the outer wall of the guide post body 510 has an external thread that mates with the internal thread. The guide post body 510 is threadedly connected to the movement pressure plate 400.

[0037] In this embodiment, the assembly of the buffer device 500 will be described in detail below with reference to the specific structure of the movement pressure plate 400 and the guide post body 510: When all other structures in the movement cavity 101 are assembled, the movement pressure plate 400 is connected to the movement housing 100 to seal the first opening; then the buffer device 500 is inserted into the mounting hole 401 so that the external thread of the guide post body 510 is threadedly engaged with the internal thread of the mounting hole 401. Then the guide post body 510 is screwed so that the buffer device 500 moves closer to the second end 202 of the spindle in the first direction until the ball bearing 520 abuts against the second end 202 of the spindle, at which point the assembly is complete.

[0038] Therefore, by setting the guide post body 510 to extend along the first direction and threading the guide post body 510 to the movement plate 400, it is convenient to adjust the force between the movement spindle 200 and the buffer device 500 (or between the second end 202 of the spindle and the ball 520) in the first direction, which improves the assembly efficiency and makes the force between the buffer device 500 and the movement plate 400 more uniform.

[0039] like Figure 3 As shown, in some embodiments of this utility model, the second end 512 of the guide post is provided with an auxiliary assembly hole 514, which extends along the first direction.

[0040] In this embodiment, referring to the detailed assembly process of the buffer device 500 described above, it can be seen that the guide post body 510 is ultimately to pass through the mounting hole 401 on the mechanism pressure plate 400 to abut against the second end 202 of the spindle; when the dimension of the guide post body 510 in the first direction is smaller than the depth of the mounting hole 401 in the first direction (such as... Figure 2 In cases where auxiliary components are needed, the guide post body 510 often needs to move within the mounting hole 401.

[0041] Specifically, taking the auxiliary assembly hole 514 as an internal hexagonal hole as an example, the auxiliary assembly accessory can be a hexagonal wrench. The two work together to realize the screwing of the guide post body 510 in the mounting hole 401 until the second end 202 of the spindle abuts against the ball 520. Finally, the hexagonal wrench is removed from the mounting hole 401.

[0042] Therefore, the addition of auxiliary assembly holes 514 further improves the overall assembly efficiency of the buffer device 500.

[0043] like Figure 2 As shown, in some embodiments of this utility model, along the first direction, there is a preset gap a between the second bearing 320 and the core pressure plate 400.

[0044] In this embodiment, it is easy to understand that, in order to further reduce the axial force on the second bearing 320 in the first direction, one of the most direct and effective ways is to ensure that the movement plate 400 and the second bearing 320 do not come into contact, that is, there is no abutting relationship between the two (movement plate 400 and second bearing 320), and naturally the second bearing 320 will not be subjected to more axial force in the first direction.

[0045] Therefore, in this embodiment, a preset gap a is set, thereby reducing the axial force on the second bearing 320 in the first direction and further ensuring the service life of the second bearing 320.

[0046] Figure 4 A cross-sectional view of the turbine flow meter provided in the embodiment of this utility model, as shown below. Figure 4 As shown, this utility model embodiment also provides a turbine flow meter 1, which includes: a flow meter housing 20; a rear guide fluid 30 installed in the cavity of the flow meter housing 20; a front guide fluid 40 installed in the cavity of the flow meter housing 20 and fixedly connected to the rear guide fluid 30; any of the above-mentioned core components 10, wherein the core housing 100 is installed in the cavity of the rear guide fluid 30, and the first end 201 of the core main shaft 200 protrudes out of the cavity of the rear guide fluid 30; and a turbine body 50 located in the cavity of the flow meter housing 20 and connected to the first end 201 of the core main shaft 200.

[0047] The turbine body 50 can be locked to the first end 201 of the main shaft of the movement main shaft 200 by means of a nut.

[0048] In this embodiment, the beneficial effects of the turbine flow meter 1 are the same as those of any of the aforementioned core components 10, namely, they can significantly reduce the damage to the core bearing, thereby ensuring the service life of the core bearing and thus ensuring the detection accuracy of the turbine flow meter. For details, please refer to the analysis of any of the aforementioned core components 10, which will not be repeated here.

[0049] Continue to refer to Figure 4 In some embodiments of this utility model, the turbine flow meter 1 further includes a counter assembly 60, which is installed in the flow meter housing 20 and is used to record the fluid flow rate of the turbine flow meter 1 during operation. The turbine flow meter 1 also includes a connecting rod assembly 70 and a magnetic coupling assembly 80. The magnetic coupling assembly 80 is drivenly connected to the main shaft 200 of the movement through the connecting rod assembly 70, and is also drivenly connected to the digit wheel of the counter assembly 60.

[0050] In this embodiment, it is easy to understand that the digit wheel of the counter assembly 60 is used to display the fluid flow rate. In order to ensure that the main shaft 200 of the mechanism can eventually drive the digit wheel to rotate, the main cavity 101 of the mechanism assembly 10 is also provided with an initial gear 600 that meshes with the main shaft 200 of the mechanism. The magnetic coupling assembly 80 meshes with the initial gear 600 through the connecting rod assembly 70, and the magnetic coupling assembly 80 also meshes with the digit wheel, thereby realizing the transmission connection between the main shaft 200 of the mechanism and the digit wheel.

[0051] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A mechanism assembly suitable for a turbine flow meter, characterized in that, The movement assembly includes: The movement housing has a movement cavity extending along a first direction; The main shaft of the mechanism passes through the mechanism cavity along the first direction. The two ends of the main shaft are a first end and a second end, respectively. The first end of the main shaft protrudes from the outer wall of the mechanism housing and is used to connect with the turbine body of the turbine flow meter. A movement bearing includes a first bearing and a second bearing. The inner ring of the first bearing is fitted onto the movement spindle, and the outer ring of the first bearing abuts against the inner wall of the movement cavity. The inner ring of the second bearing is fitted onto the movement spindle, and the outer ring of the second bearing abuts against the inner wall of the movement cavity. Along a first direction, the first bearing and the second bearing are located at opposite ends of the movement cavity. The distance of the first bearing from a first end of the spindle is less than the distance of the second bearing from a first end of the spindle. A buffer device is fixedly connected to the movement housing and abuts against the second end of the main shaft. The buffer device is configured to buffer the axial force on the main shaft of the movement in the first direction.

2. The movement assembly according to claim 1, characterized in that, Along the first direction, one end of the movement housing has a first opening communicating with the movement cavity, the movement assembly further includes a movement pressure plate for sealing the first opening, the buffer device is fixedly connected to the movement pressure plate, and the movement pressure plate is detachably connected to the movement housing.

3. The movement assembly according to claim 2, characterized in that, The movement cavity includes a first cavity and a second cavity arranged along a first direction and interconnected with each other, and the outer ring of the second bearing abuts against the inner wall of the second cavity; The second cavity has a limiting wall, and along the first direction, the first opening is located on the side of the second cavity away from the first cavity. The limiting wall is used to prevent the second bearing from moving away from the first opening.

4. The movement assembly according to claim 2, characterized in that, The buffer device includes: The guide post body is fixedly connected to the mechanism pressure plate. The interior of the guide post body has a guide post cavity extending along the first direction, and the guide post body has a second opening communicating with the guide post cavity. A ball bearing abuts against the second end of the spindle, at least a portion of the ball bearing's structure being located within the guide post cavity, the ball bearing being configured to extend out of the guide post cavity through the second opening and to reciprocate along the first direction; and An elastic element is located within the guide post cavity. The elastic element extends along the first direction and is capable of telescoping along the first direction. One end of the elastic element is connected to the ball bearing, and the other end of the elastic element is connected to the inner wall of the guide post cavity.

5. The movement assembly according to claim 4, characterized in that, The guide post body extends along the first direction, and the two ends of the guide post body are the first end of the guide post and the second end of the guide post, respectively. The second opening is provided at the first end of the guide post.

6. The movement assembly according to claim 5, characterized in that, The movement plate has a mounting hole extending along the first direction, the mounting hole has an internal thread, the outer wall of the guide post body has an external thread that mates with the internal thread, and the guide post body is threadedly connected to the movement plate.

7. The movement assembly according to claim 6, characterized in that, The second end of the guide post is provided with an auxiliary assembly hole, which extends along the first direction.

8. The movement assembly according to any one of claims 2-7, characterized in that, Along the first direction, there is a preset gap between the second bearing and the mechanism pressure plate.

9. A turbine flow meter, characterized in that, The turbine flow meter includes: Flowmeter housing; The downstream fluid guide is installed inside the cavity of the flow meter housing; A guide fluid is installed inside the cavity of the flow meter housing and is fixedly connected to the guide fluid. The movement assembly as described in any one of claims 1-8, wherein the movement housing is mounted within the cavity of the rear fluid guide, and the first end of the main shaft of the movement protrudes from the cavity of the rear fluid guide; and The turbine body is located inside the cavity of the flow meter housing and is connected to the first end of the main shaft of the mechanism.

10. The turbine flow meter according to claim 9, characterized in that, The turbine flow meter further includes a counter assembly, a connecting rod assembly, and a magnetic coupling assembly; the counter assembly is installed in the flow meter housing and is used to record the fluid velocity when the turbine flow meter is working; the magnetic coupling assembly is driven to the main shaft of the mechanism through the connecting rod assembly, and the magnetic coupling assembly is driven to the digit wheel of the counter assembly.

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