Axial force measuring device

Abstract

The utility model relates to an axial force measuring device, which comprises a support shell, a bearing box, a bearing seat, a bearing seat, a bearing seat, a bearing seat, a bearing seat and an axial force measuring device, and is characterized in that the support shell is detachably connected with the bearing seat; the axial force transmission rotating piece is rotatably arranged in the supporting shell, and the axial force transmission rotating piece is used for being detachably connected with a shaft head of the pump; the at least two thrust bearings are arranged in the transmission direction of the axial force, the two thrust bearings are located in the supporting shell, and the thrust bearings are arranged between the supporting shell and the axial force transmission rotating piece; and the force measuring element is clamped between the two thrust bearings, and the force measuring element is used for detecting the axial force transmitted to the thrust bearings from the axial force transmission rotating piece. According to the utility model, the technical problem that the real axial force generated by the pump cannot be accurately measured is solved.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal pump technology, and more particularly to an axial force measuring device, especially an axial force measuring device for wear-resistant bearings of centrifugal pumps. Background Technology

[0002] Centrifugal pumps, due to the uneven pressure distribution on their impellers, experience axial forces on their wear-resistant bearings towards the impeller inlet during operation. These axial forces are crucial for pump operation, significantly impacting the temperature and lifespan of the wear-resistant bearings. Furthermore, the actual axial force level is closely related to the machining and assembly dimensional errors of the components, often differing considerably from the theoretical value.

[0003] At present, manufacturers basically calculate the magnitude of axial force in theory. However, in actual production, due to the influence of machining and assembly dimensional errors of the rotor of the wear-resistant bearing structure, it is difficult to accurately measure the axial force level. Therefore, in actual production, it is difficult to measure and correct the axial force generated by the centrifugal pump with the wear-resistant bearing structure to perfectly balance the axial force.

[0004] There is currently no effective solution to the problem that the actual axial force generated by the pump cannot be accurately measured in related technologies.

[0005] Therefore, this utility model proposes an axial force measuring device to overcome the shortcomings of the prior art. Utility Model Content

[0006] The purpose of this invention is to provide an axial force measuring device that can accurately measure the actual axial force generated by a centrifugal pump with a wear-resistant bearing structure and display it in the form of a digital signal. This enables accurate measurement and convenient reading of the actual axial force data, allowing for correction of the axial force level of the centrifugal pump and improvement of its quality.

[0007] The objective of this utility model can be achieved by the following solutions:

[0008] This utility model provides an axial force measuring device, the axial force measuring device comprising:

[0009] A support housing for detachable connection to the pump's bearing housing;

[0010] An axial force transmission rotating component is rotatably disposed within the support housing and is used for detachable connection with the pump shaft.

[0011] At least two thrust bearings are arranged along the direction of axial force transmission, the two thrust bearings are located inside the support housing, and the thrust bearings are disposed between the support housing and the axial force transmission rotating component;

[0012] A force measuring element is sandwiched between the two thrust bearings and is used to detect the axial force transmitted to the thrust bearings by the axial force transmitting rotating component.

[0013] In a preferred embodiment of the present invention, the axial force measuring device further includes at least one radial bearing, which is disposed between the shaft head and the bearing housing to replace the original bearing disposed between the shaft head and the bearing housing.

[0014] In a preferred embodiment of the present invention, a pressure block is provided inside the support housing and between the thrust bearing and the force measuring element. The pressure block has a mounting groove on its wall facing the thrust bearing. An elastic element is provided in the mounting groove and is pressed between the bottom wall of the mounting groove and the thrust bearing.

[0015] In a preferred embodiment of the present invention, a hollow cavity is formed inside the axial force transmission rotating component, and a first flow channel is provided on the axial force transmission rotating component to connect the hollow cavity and the thrust bearing. The first flow channel is used to transport the lubricating oil in the hollow cavity to the thrust bearing.

[0016] In a preferred embodiment of this utility model, there are two first flow channels, both of which penetrate the wall of the axial force transmission rotating member and are respectively connected to the corresponding thrust bearing.

[0017] One of the two first flow channels has a first guide portion at its inlet. The first guide portion is disposed on the inner wall of the hollow cavity and has a flared structure that gradually expands from the direction close to the first flow channel to the direction away from the first flow channel.

[0018] And / or, the inlet of the other of the two first flow channels has a second flow guide, the second flow guide is disposed on the inner wall surface of the hollow cavity, and the second flow guide has a slope-shaped structure that is inclined from away from the first flow channel to close to the first flow channel. The second flow guide is located on one side of the first flow channel, and a boss-shaped abutment is provided on the opposite side of the first flow channel in the axial direction of the hollow cavity.

[0019] In a preferred embodiment of the present invention, the supporting shell has a second flow channel and a lubricant inlet. The lubricant inlet is connected to one end of the second flow channel, and the other end of the second flow channel forms a lubricant outlet, which is connected to the hollow cavity.

[0020] In a preferred embodiment of the present invention, the supporting housing has a lubricant return port that communicates with the thrust bearing, and the lubricant return port is connected to the lubricant inlet.

[0021] In a preferred embodiment of the present invention, the supporting shell includes a cylindrical shell body, an annular base, and an end cap. The base is used to be sleeved on the shaft head and detachably connected to the bearing housing. The shell body is arranged around the outer periphery of the axial force transmission rotating member, and one end of the shell body is connected to the base. The end cap is connected to the other end of the shell body.

[0022] The outer casing has a mounting hole communicating with its interior, and the force measuring element is inserted into the interior of the outer casing through the mounting hole.

[0023] In a preferred embodiment of the present invention, there are two second flow channels, both of which are disposed on the end cap. At least a portion of the end cap extends into the hollow cavity. In the axial direction of the hollow cavity, the outlets of the two second flow channels located on the end cap extend to positions opposite to the first guide portion and the second guide portion, respectively.

[0024] In a preferred embodiment of the present invention, the signal output terminal of the force measuring element is electrically connected to the signal receiving terminal of the display screen so as to display the detected axial force value through the display screen; and / or, the force measuring element is a strain gauge force sensor.

[0025] As described above, the features and advantages of the axial force measuring device of this utility model are:

[0026] During the pump's production testing phase, the support housing can be connected to the pump's bearing housing, and the axial force transmission rotating component located inside the support housing can be connected to the pump's shaft. During testing, both the support housing and the pump's bearing housing are stationary, while the axial force transmission rotating component rotates synchronously with the pump's shaft, thus transmitting the axial force from the shaft to the axial force transmission rotating component. Since two thrust bearings are spaced apart between the support housing and the axial force transmission rotating component along the direction of axial force transmission, the axial force on the axial force transmission rotating component will be transmitted to at least one thrust bearing regardless of its direction, and will be detected by a force measuring element sandwiched between the two thrust bearings. This achieves the purpose of accurately measuring the pump's true axial force, so that the pump's axial force level can be corrected based on the measurement results. Attached Figure Description

[0027] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the present invention. Wherein:

[0028] Figure 1 This is a front cross-sectional view of the axial force measuring device of this utility model.

[0029] The reference numerals in the accompanying drawings of this utility model are:

[0030] 1. Supporting shell; 101. Shell body;

[0031] 102. Base; 103. Second flow channel;

[0032] 104. Lubricating fluid inlet; 105. End cap;

[0033] 106. Lubricating fluid return port; 2. Rotating component for axial force transmission;

[0034] 201. Hollow cavity; 202. First flow channel;

[0035] 203. First guide section; 204. Second guide section;

[0036] 205. Blocking section; 3. Thrust bearing;

[0037] 4. Force measuring element; 5. Radial bearing;

[0038] 6. Pressure block; 7. Elastic component;

[0039] 10. Bearing housing; 20. Shaft end. Detailed Implementation

[0040] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate this utility model and are not intended to limit the scope of this utility model. After reading this utility model, any modifications of this utility model in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0041] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0043] It should be noted that the axial force measuring device of this invention is applied to the production stage of pumps (such as centrifugal pumps). Due to the influence of assembly and dimensional errors of parts during actual production, an axial force is generated towards the impeller inlet of the pump, but it is difficult to measure accurately. Therefore, the axial force measuring device of this invention is proposed. This axial force measuring device is used as a test fixture in the pump production and testing process to detect the axial force of the pump shaft and display it numerically. After the axial force measurement is completed, the axial force measuring device can be removed, and the assembly structure of the pump and the dimensions of corresponding parts can be adjusted according to the measured data to balance the axial force and improve the quality of the pump.

[0044] The structure of the axial force measuring device in this utility model is described below:

[0045] like Figure 1As shown, this utility model provides an axial force measuring device, which includes a supporting housing 1, an axial force transmission rotating component 2, a force measuring element 4, and at least two thrust bearings 3. The axial force transmission rotating component 2 is rotatably disposed inside the supporting housing 1. The two thrust bearings 3 are arranged at intervals along the direction of axial force transmission. The two thrust bearings 3 are located inside the supporting housing 1 and are disposed between the supporting housing 1 and the axial force transmission rotating component 2. The axial force transmission rotating component 2 can be rotated and supported inside the supporting housing 1 through the two thrust bearings 3. The aforementioned force measuring element 4 is sandwiched between the two thrust bearings 3. In the measurement state, the support housing 1 is detachably connected to the bearing housing 10 of the pump, and the axial force transmission rotating member 2 is detachably connected to the shaft head 20 of the pump to transmit the axial force of the shaft head 20 to the axial force transmission rotating member 2. The axial force transmitted to the axial force transmission rotating member 2 is transmitted to at least one thrust bearing 3, and the force measuring element 4 located between the two thrust bearings 3 can measure the axial force transmitted from the axial force transmission rotating member 2 to the thrust bearing 3, thereby obtaining the true level of the axial force of the pump.

[0046] This invention can be used in the production and testing phase of a pump. It connects the supporting housing 1 to the pump's bearing housing 10, and connects the axial force transmission rotating component 2, located within the supporting housing 1, to the pump's shaft head 20. During testing, both the supporting housing 1 and the pump's bearing housing 10 are stationary, while the axial force transmission rotating component 2 rotates synchronously with the pump's shaft head 20, thus transmitting the axial force from the shaft head 20 to the axial force transmission rotating component 2. Since two thrust bearings 3 are spaced apart between the supporting housing 1 and the axial force transmission rotating component 2 along the direction of axial force transmission, the axial force on the axial force transmission rotating component 2 will be transmitted to at least one thrust bearing 3 regardless of its direction, and detected by the force measuring element 4 sandwiched between the two thrust bearings 3. This achieves the purpose of accurately measuring the pump's true axial force, allowing for correction of the pump's axial force level based on the measurement results, thereby improving pump quality.

[0047] In this invention, two thrust bearings 3 are provided, and are respectively located on the left and right sides of the force measuring element 4 (e.g., Figure 1 As shown in the diagram, the direction of the axial force transmitted by the shaft head 20 during actual production can be either inward or outward along the axial direction of the shaft head 20 (i.e., ...). Figure 1 Since the axial force of the shaft head 20 is directed either to the right or left, thrust bearings 3 are respectively installed on both sides of the force measuring element 4. Regardless of the direction of the axial force of the shaft head 20, it will be transmitted to at least one thrust bearing 3 and detected by the force measuring element 4, so as to achieve the purpose of accurately measuring the axial force of the pump. Among them, the thrust bearing 3 is a double-direction thrust bearing.

[0048] In one optional embodiment of this utility model, such as Figure 1As shown, the axial force measuring device also includes at least one radial bearing 5, which is installed between the shaft head 20 and the pump bearing housing 10 to replace the original bearing installed between the shaft head 20 and the pump bearing housing 10. That is, during pump production, a bearing is needed between the shaft head 20 and the pump bearing housing 10 to support the shaft head 20. However, this bearing is generally a thrust bearing. But when using the axial force measuring device of this invention to measure axial force, if the bearing is still a thrust bearing, the axial force of the shaft head 20 cannot be transmitted to the axial force transmission rotating component 2, thus making it impossible to measure the axial force of the pump. Therefore, when using the axial force measuring device of this invention to measure the axial force of the pump, the original bearing between the shaft head 20 and the pump bearing housing 10 needs to be replaced with the aforementioned radial bearing 5. At this time, the radial bearing 5 only serves to support the shaft head 20 and ensure its stable rotation, while the axial force on the shaft head 20 can be fully transmitted to the axial force transmission rotating component 2, thereby achieving the effect of accurately measuring the axial force of the pump. It should be noted that the radial bearing 5 is only used during the measurement process. After the axial force measurement of the pump is completed, the radial bearing 5 between the shaft end 20 and the pump bearing housing 10 is replaced with the original thrust bearing.

[0049] In one optional embodiment of this utility model, such as Figure 1 As shown, an annular pressure block 6 is sandwiched inside the support housing 1 between the thrust bearing 3 and the force measuring element 4. The pressure block 6 has a mounting groove on its wall facing the thrust bearing 3. An elastic element 7 is installed in the mounting groove, pressing against the bottom wall of the mounting groove and the thrust bearing 3. The pressure block 6 and the elastic element 7 ensure that, regardless of the direction of the axial force of the shaft head 20 during testing, there is always a certain force between the two thrust bearings 3 and the force measuring element 4. This prevents the thrust bearing 3, which is not under load during measurement, from slipping and being damaged due to insufficient minimum force requirements.

[0050] Furthermore, such as Figure 1 As shown, the elastic element 7 can be, but is not limited to, a spring. One end of the spring abuts against the bottom wall of the mounting groove, and the other end of the spring abuts against the thrust bearing 3. Of course, other elastic structural components can also be used, and the specific structure of the elastic element 7 is not limited here.

[0051] In one optional embodiment of this utility model, such as Figure 1 As shown, a hollow cavity 201 is formed inside the axial force transmission rotating component 2. The axial force transmission rotating component 2 has a first flow channel 202 that connects the hollow cavity 201 and the thrust bearing 3. Lubricating oil can be injected into the hollow cavity 201, and then the lubricating oil in the hollow cavity 201 is transported to the thrust bearing 3 through the first flow channel 202, so as to lubricate the thrust bearing 3 and ensure the stable and smooth operation of the thrust bearing 3.

[0052] Specifically, such as Figure 1 As shown, there are two first flow channels 202. Both first flow channels 202 penetrate the wall of the axial force transmission rotating component 2 and are respectively connected to the two corresponding thrust bearings 3, thereby providing lubricating oil to the two thrust bearings 3 respectively, achieving lubrication of the two thrust bearings 3. Among them, one of the two first flow channels 202 has a first guide portion 203 at its inlet. The first guide portion 203 is disposed on the inner wall of the hollow cavity 201, and the first guide portion 203 has a flared structure that gradually expands from the direction close to the first flow channel 202 to the direction away from the first flow channel 202. Thus, the first guide portion 203 can guide the lubricating oil in the hollow cavity 201 to the first flow channel 202, avoiding the situation where the lubricating oil in the hollow cavity 201 cannot smoothly enter the first flow channel 202 when there is too little lubricating oil; and / or, the other of the two first flow channels 202 has a second guide portion 204 at its inlet. 4. The second guide portion 204 is disposed on the inner wall of the hollow cavity 201 and has an inclined slope structure that moves from away from the first flow channel 202 to close to the first flow channel 202. The second guide portion 204 can also guide the lubricating oil in the hollow cavity 201. In order to ensure that the lubricating oil in the hollow cavity 201 can be smoothly guided into the first flow channel 202, the second guide portion 204 is located on one side of the first flow channel 202 in the axial direction of the hollow cavity 201, and a boss-shaped abutment portion 205 can be provided on the other opposite side of the first flow channel 202 to block the lubricating oil and ensure that the lubricating oil fully enters the first flow channel 202.

[0053] Furthermore, such as Figure 1 As shown, the supporting housing 1 has a second flow channel 103 and a lubricant inlet 104. The lubricant inlet 104 is connected to one end of the second flow channel 103, and the other end of the second flow channel 103 forms a lubricant outlet. The lubricant outlet is connected to the hollow cavity 201. Lubricating oil can be injected into the hollow cavity 201 through the second flow channel 103 to ensure the stable and smooth operation of the thrust bearing 3.

[0054] Furthermore, such as Figure 1As shown, the supporting housing 1 has a lubricant return port 106 connected to the thrust bearing 3. The lubricant return port 106 is connected to the lubricant inlet 104. The lubricating oil passing through the thrust bearing 3 can return to the lubricant inlet 104 through the lubricant return port 106 and then enter the hollow cavity 201 through the lubricant inlet 104, realizing the circulation of the lubricating oil. During this circulation process, the lubricating oil can also carry away the heat generated by the rotation of the thrust bearing 3 under force, which can significantly reduce the temperature rise level of the axial force measuring device during operation, effectively reducing the risk of the thrust bearing burning out due to excessive temperature, and achieving the effect of cooling and ensuring the stable operation of the axial force measuring device.

[0055] In one optional embodiment of this utility model, such as Figure 1 As shown, the supporting housing 1 includes a cylindrical housing body 101, an annular base 102, and a disc-shaped end cap 105. In the measuring state, the base 102 is fitted onto the shaft head 20 and detachably connected to the bearing housing 10. The housing body 101 is arranged around the outer periphery of the axial force transmission rotating component 2, with one end of the housing body 101 connected to the base 102, and the end cap 105 connected to the other end of the housing body 101. The housing body 101 has a mounting hole communicating with its interior, through which the force measuring element 4 is inserted into the interior of the housing body 101. The base 102 and bearing housing 10, the axial force transmission rotating component 2 and shaft head 20, the housing body 101 and base 102, and the housing body 101 and end cap 105 can all be connected by multiple bolts for easy assembly and disassembly.

[0056] Specifically, such as Figure 1 As shown, there are two second flow channels 103, each corresponding to one thrust bearing 3. Both second flow channels 103 are mounted on end caps 105, with at least a portion of the end caps 105 extending into the hollow chamber 201. In the axial direction of the hollow chamber 201, the outlet of one second flow channel 103 on the end cap 105 extends to a position opposite to the first guide portion 203, while the outlet of the other second flow channel 103 extends to a position opposite to the second guide portion 204. The lubricating oil injected through the outlets of the two second flow channels 103 can be guided to the two first flow channels 202 through the first guide portion 203 and the second guide portion 204, respectively, so that the lubricating oil can be evenly distributed in the hollow chamber 201, thereby achieving sufficient lubrication for the two thrust bearings 3. Of course, in the axial direction of the hollow chamber 201, the outlets of the two second flow channels 103 can also be extended directly to positions opposite to the two first flow channels 202 respectively, so that the lubricating oil can be injected directly into the corresponding first flow channel 202 as much as possible, further ensuring that the lubricating oil is fully utilized.

[0057] Furthermore, such as Figure 1As shown, the outer shell 101 can be formed by splicing together the parts located on both sides of the force measuring element 4, that is... Figure 1 The two outer shell bodies 101 located on the left and right sides of the force measuring element 4 are connected by bolts, and the force measuring element 4 is located between the two outer shell bodies 101, which facilitates the installation of the force measuring element 4.

[0058] In an optional embodiment of this invention, the signal output terminal of the force measuring element 4 is electrically connected to the signal receiving terminal of the display screen to display the detected axial force value. An analog-to-digital conversion circuit is provided on the force measuring element 4 or between the force measuring element 4 and the display screen. This circuit converts the analog signal (current signal, voltage signal, etc.) detected by the force measuring element 4 into a digital signal, which is then displayed on the display screen. This allows operators to directly obtain the axial force of the pump through the display screen for corrective action.

[0059] In this invention, the force measuring element 4 can be a strain gauge force sensor. The strain gauge force sensor can be, but is not limited to, a resistance strain gauge force sensor.

[0060] The working process of the axial force measuring device of this utility model is as follows: Before starting the pump, the thrust bearing originally located between the shaft head 20 and the pump bearing housing 10 is replaced with a radial bearing 5. Then, the support housing 1 is fitted onto the outside of the shaft head 20, and the support housing 1 is bolted to the pump bearing housing 10. The axial force transmission rotating component 2 located inside the support housing 1 is also bolted to the shaft head 20. After starting the pump, the pump shaft transmits the axial force to the axial force transmission rotating component 2 through the shaft head 20 during rotation. The axial force transmission rotating component 2 transmits the axial force to the thrust bearing 3, and finally the axial force is completely transmitted to the force measuring element 4 for detection. The force measuring element 4 undergoes deformation due to the axial force, causing a change in its internal resistance, which in turn causes a corresponding change in its output current. Finally, the current signal reflecting the axial force is converted into a readable digital signal and displayed on the screen, thereby achieving accurate measurement of the pump's axial force. The actual axial force value can be directly read from the display screen.

[0061] During the above process, the thrust bearing 3 is always fully lubricated by lubricating oil, ensuring the stable and smooth operation of the thrust bearing 3.

[0062] The axial force measuring device of this utility model is installed as an integral component on the outside of the bearing housing 10 of the pump by skid mounting. It is simple and efficient to assemble, does not affect the structure and normal operation of the pump, and can be easily disassembled and installed on other pumps for axial force measurement after measuring one pump.

[0063] The features and advantages of this axial force measuring device are as follows:

[0064] 1. This axial force measuring device has two thrust bearings 3 spaced apart between the supporting housing 1 and the axial force transmission rotating component 2 along the direction of axial force transmission. Regardless of the direction of the axial force on the axial force transmission rotating component 2, it will be transmitted to at least one thrust bearing 3 and detected by the force measuring element 4 clamped between the two thrust bearings 3. This achieves the purpose of accurately measuring the true axial force of the pump, so as to correct the axial force level of the pump based on the measurement results, thereby improving the quality of the pump.

[0065] Second, this axial force measuring device can convert the signal detected by the force measuring element 4 into a digital signal and display it on the screen. The operator can directly know the axial force of the pump through the screen so as to make corrections.

[0066] It should be noted that in the description of this application, the terms "first," "second," etc., are used only for descriptive purposes and to distinguish similar objects; there is no order between them, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0067] The various embodiments described in this specification are presented in a progressive manner. The same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0068] The above are merely several embodiments of this utility model. Although the embodiments disclosed in this utility model are as described above, the content is only for the purpose of facilitating understanding of this utility model and is not intended to limit this utility model. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of this utility model should fall within the protection scope of this utility model.

Claims

1. An axial force measuring device, characterized in that, The axial force measuring device includes: A support housing for detachable connection to the pump's bearing housing; An axial force transmission rotating component is rotatably disposed within the support housing and is used for detachable connection with the pump shaft. At least two thrust bearings are arranged along the direction of axial force transmission, the two thrust bearings are located inside the support housing, and the thrust bearings are disposed between the support housing and the axial force transmission rotating component; A force measuring element is sandwiched between the two thrust bearings and is used to detect the axial force transmitted to the thrust bearings by the axial force transmitting rotating component.

2. The axial force measuring device of claim 1, wherein, The axial force measuring device further includes at least one radial bearing, which is disposed between the shaft head and the bearing housing to replace the original bearing disposed between the shaft head and the bearing housing.

3. The axial force measuring device of claim 1, wherein, A pressure block is sandwiched inside the support housing and between the thrust bearing and the force measuring element. The pressure block has a mounting groove on its wall facing the thrust bearing. An elastic element is provided in the mounting groove and is pressed between the bottom wall of the mounting groove and the thrust bearing.

4. The axial force measuring device of claim 1, wherein, The axial force transmission rotating component has a hollow cavity inside, and the axial force transmission rotating component has a first flow channel connecting the hollow cavity and the thrust bearing. The first flow channel is used to transport the lubricating oil in the hollow cavity to the thrust bearing.

5. The axial force measuring device of claim 4, wherein, The first flow channel consists of two channels, both of which penetrate the wall of the axial force transmission rotating component and are respectively connected to the corresponding thrust bearing. One of the two first flow channels has a first guide portion at its inlet. The first guide portion is disposed on the inner wall of the hollow cavity and has a flared structure that gradually expands from the direction close to the first flow channel to the direction away from the first flow channel. And / or, the inlet of the other of the two first flow channels has a second flow guide, the second flow guide is disposed on the inner wall surface of the hollow cavity, and the second flow guide has a slope-shaped structure that is inclined from away from the first flow channel to close to the first flow channel. The second flow guide is located on one side of the first flow channel, and a boss-shaped abutment is provided on the opposite side of the first flow channel in the axial direction of the hollow cavity.

6. The axial force measuring device of claim 5, wherein, The supporting shell has a second flow channel and a lubricant inlet. The lubricant inlet is connected to one end of the second flow channel, and the other end of the second flow channel forms a lubricant outlet, which is connected to the hollow cavity.

7. The axial force measuring device of claim 6, wherein, The supporting housing has a lubricant return port that communicates with the thrust bearing, and the lubricant return port is connected to the lubricant inlet.

8. The axial force measuring device of claim 6, wherein, The supporting housing includes a cylindrical housing body, an annular base, and an end cap. The base is used to be fitted onto the shaft head and detachably connected to the bearing housing. The housing body is arranged around the outer periphery of the axial force transmission rotating component, and one end of the housing body is connected to the base. The end cap is connected to the other end of the housing body. The outer casing has a mounting hole communicating with its interior, and the force measuring element is inserted into the interior of the outer casing through the mounting hole.

9. The axial force measuring device of claim 8, wherein, The number of the second flow channels is two, and both second flow channels are disposed on the end cap. At least a portion of the end cap extends into the hollow cavity. In the axial direction of the hollow cavity, the outlets of the two second flow channels located on the end cap extend to positions opposite to the first guide portion and the second guide portion, respectively.

10. The axial force measuring device of claim 1, wherein, The signal output terminal of the force measuring element is electrically connected to the signal receiving terminal of the display screen to display the detected axial force value through the display screen; and / or, the force measuring element is a strain gauge force sensor.

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