Measuring device and measuring method

Abstract

The present application relates to a kind of measuring device and measuring method, measuring device includes: mounting seat, for the rotatable shaft of centrifugal pump is detachably installed;Moving mechanism is installed in mounting seat, moving mechanism can reciprocate along first direction;Detection device is installed in the side of mounting seat away from rotatable shaft.The above-mentioned measuring device, remove intermediate water chamber cover, install rotatable shaft by mounting seat, by moving mechanism, the inner side wall of intermediate water chamber pump body is abutted on the opposite sides in first direction, the reaction force of the inner side wall of intermediate water chamber pump body pushes rotatable shaft and mounting seat to move, and then the distance between second measurement datum surface and detection device is measured by detection device, which can be equivalent to the total wear of balance disc and balance chamber cover.So, only need to disassemble intermediate water chamber cover, simplify the measurement step, improve work efficiency, and detection device is non-contact type measurement distance, accuracy is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wear of a balancing disc of a centrifugal pump, and particularly relates to a measuring device and a measuring method. BACKGROUND

[0002] A centrifugal pump refers to a pump for conveying liquid by centrifugal force generated when an impeller rotates, and is widely used in power, metallurgy, coal, building materials and other industries to convey slurry containing solid particles. The TWL-45S type centrifugal pump is one of centrifugal pumps. When the TWL-45S type centrifugal pump is started and stopped or the working condition changes, due to the fact that the front and rear cover plates of the impeller are subjected to different pressures, the pressure on the suction port side is small, the pressure on the outlet side is large, and under the action of the pressure difference, the rotor assembly will generate a large axial force, the axial force will generate pulsation to make the rotor axially move, and then cause the balancing disc and the balancing chamber cover to axially wear. When the wear reaches a certain degree, the balancing disc and the balancing chamber cover need to be replaced to ensure the normal operation of the centrifugal pump.

[0003] In the prior art, there are two schemes for measuring the total wear of the balancing disc and the balancing chamber cover. One is to disassemble the centrifugal pump and dismount the balancing disc and the balancing chamber cover, and then directly measure. The other is to dismount the steam side balancing pipe, the main steam valve / regulating valve packing gland steam pipe and other pipelines, and install auxiliary tools on the steam end of the rotor, and measure the axial movement of the rotor by pushing / pulling the rotor with the auxiliary tools, and calculate the wear from the change of the axial movement of the rotor.

[0004] Both the above two methods need to dismount many parts, have large dismounting work and low measurement efficiency, and have the risk of foreign matter falling into the centrifugal pump. SUMMARY

[0005] Therefore, it is necessary to provide a measuring device and a measuring method with high measurement efficiency and simple dismounting in view of the problems of large work and low efficiency in measuring the total wear of the balancing disc and the balancing chamber cover in the prior art.

[0006] According to one aspect of the present application, an embodiment of the present application provides a measuring device for measuring wear of a balancing disc of a centrifugal pump, the centrifugal pump comprising a rotor shaft, an intermediate water chamber pump body and the balancing disc, the rotor shaft being arranged in the intermediate water chamber pump body, and the balancing disc being sleeved on the rotor shaft and located in the intermediate water chamber pump body; opposite two inner side surfaces of the intermediate water chamber pump body along a first direction form a first measuring reference surface and a second measuring reference surface, respectively, the first direction being an axial direction of the rotor shaft; the measuring device comprises:

[0007] a mounting seat for detachably mounting a standard position on the rotor shaft of the centrifugal pump;

[0008] A moving mechanism is mounted on the mounting base and is capable of reciprocating along the first direction; and

[0009] A detection device is mounted on the mounting base and is used to measure the distance to the second measurement reference surface when the moving mechanism is in contact with the first measurement reference surface and / or the second measurement reference surface.

[0010] In one embodiment, the mounting base comprises a clamp;

[0011] One end of the clamp forms a positioning slot adapted to the rotor shaft.

[0012] In one embodiment, the mounting base further comprises a first clamping member and a second clamping member; first and second installation slots are spaced apart along a second direction on the clamp;

[0013] The first clamping member is inserted into the clamp through the first installation slot;

[0014] The second clamping member is inserted into the clamp through the second installation slot;

[0015] The first and second clamping members are respectively provided with first and second arc-shaped slots on the side facing each other, and the first and second arc-shaped slots jointly define an installation slot to clamp the rotor shaft;

[0016] The first direction and the second direction are perpendicular.

[0017] In one embodiment, the mounting base further comprises a limiting plate;

[0018] The limiting plate is arc-shaped and formed on the inner wall of the positioning slot of the clamp, and is used to accommodate a limiting slot on the rotor shaft.

[0019] In one embodiment, the clamp is further provided with a first through hole, which penetrates the clamp along the first direction;

[0020] The moving mechanism comprises a gear and a rack; the gear is rotatably mounted on the clamp, and the axis of the gear extends along a third direction; the rack is movably inserted into the clamp through the first through hole; and the gear is engaged with the rack.

[0021] The first direction, the second direction and the third direction are perpendicular to each other.

[0022] In one embodiment, the moving mechanism further comprises an operating handle;

[0023] One end of the operation handle is installed on the gear to drive the gear to rotate around its own central axis.

[0024] In one of the embodiments, the moving mechanism further comprises two measuring contacts.

[0025] The two measuring contacts are installed on the rack, and the two measuring contacts are respectively located on opposite sides of the rack along the first direction.

[0026] In one of the embodiments, the moving mechanism further comprises a gear gland; the fixture is formed with a stepped hole, the stepped hole has a larger hole diameter away from the rotor shaft than a hole diameter close to the rotor shaft, the gear is arranged in the stepped hole, and the gear gland is fixedly installed on a stepped surface of the stepped hole.

[0027] In one of the embodiments, the second clamping member is provided with a third through hole along the second direction, and the mounting seat further comprises a pre-tightening screw.

[0028] The pre-tightening screw extends into the third through hole to be installed on the second clamping member, and one end of the pre-tightening screw abuts against one side of the first clamping member facing the second clamping member to drive the second clamping member to move towards the first clamping member.

[0029] According to another aspect of the present application, the embodiments of the present application provide a measuring method using the above-mentioned measuring device; the measuring method comprises the following measuring steps:

[0030] The mounting seat is installed on the rotor shaft.

[0031] The moving mechanism is driven to move along the first direction until the moving mechanism abuts against the first measuring reference surface, the distance between the detection device and the second measuring reference surface is measured by the detection device; and / or, the moving mechanism is driven to move along the second direction until the moving mechanism abuts against the second measuring reference surface, the distance between the detection device and the second measuring reference surface is measured by the detection device.

[0032] The above-mentioned measuring device, the intermediate water chamber cover plate is removed, the rotor shaft is installed by means of the mounting seat, the moving mechanism is driven to abut against the inner side wall of the intermediate water chamber pump body along the opposite sides of the first direction, and the reaction force generated by the inner side wall of the intermediate water chamber pump body can push the movement of the rotor shaft and the mounting seat, and then the distance between the second measuring reference surface and the detection device is measured by means of the detection device, which can be equivalent to the wear amount of the balance disc. In this way, only the intermediate water chamber cover plate needs to be disassembled for measurement, which simplifies the measurement steps, improves the work efficiency, and the detection device is a non-contact type for measuring distance, which has high accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 Assembly diagram of the measuring device in the working state of the present application;

[0034] Figure 2 Assembly diagram of the measuring device in another working state of the present application;

[0035] Figure 3 Assembly diagram of the measuring device and the rotor shaft of the present application;

[0036] Figure 4 Assembly diagram of the front view of the measuring device of the present application;

[0037] Figure 5 Assembly diagram of the top view of the measuring device of the present application;

[0038] Figure 6 Assembly diagram of the left view of the measuring device of the present application;

[0039] Figure 7 Assembly diagram of the isometric view of the fixture of the present application;

[0040] Figure 8 Assembly diagram of the front view of the fixture of the present application;

[0041] Figure 9 Assembly diagram of the top view of the fixture of the present application;

[0042] Figure 10 Assembly diagram of the left view of the fixture of the present application;

[0043] Figure 11 Assembly diagram of the top view of the gear of the present application;

[0044] Figure 12 Assembly diagram of the front view of the operating handle of the present application;

[0045] Figure 13 Assembly diagram of the front view of the operating handle and the gear assembly of the present application;

[0046] Figure 14 Assembly diagram of the top view of the operating handle and the gear assembly of the present application;

[0047] Figure 15 Assembly diagram of the left view of the operating handle and the gear assembly of the present application;

[0048] Figure 16 Assembly diagram of the top view of the gear gland of the present application;

[0049] Figure 17 Flowchart of the measuring method of the present application;

[0050] Figure 18 Another flowchart of the measuring method in the present application.

[0051] BRIEF DESCRIPTION OF DRAWINGS

[0052] 100, measuring device; 110, mounting seat; 111, clamp; 1111, first mounting groove; 1112, second mounting groove; 1113, stepped hole; 1114, first through hole; 112, first clamping piece; 1121, first arc-shaped groove; 113, second clamping piece; 1131, second arc-shaped groove; 1132, third through hole; 114, mounting groove; 115, pre-tightening screw; 116, limiting plate; 120, moving mechanism; 121, gear; 1211, mounting through hole; 122, rack; 123, operation handle; 124, measuring contact; 125, gear gland; 1251, second through hole; 126, key; 130, detection device; 200, centrifugal pump; 210, balance disc; 220, balance chamber cover; 230, thrust ring; 240, intermediate water chamber pump body; 241, first measuring reference surface; 242, second measuring reference surface; 250, rotor shaft; 251, limiting groove. DETAILED DESCRIPTION

[0053] In order to make the above object, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings. In the following description, a lot of specific details are set forth in order to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the concept of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0054] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" 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 purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to 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.

[0055] In addition, the terms "first", "second", etc. are used herein only to describe different instances, and are not used to denote or imply relative importance or a number of indications of the technical features indicated. Thus, the technical features defined with "first", "second", etc. can explicitly or implicitly include at least one of the technical features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0056] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, 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, unless otherwise explicitly limited. 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.

[0057] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0058] It should be noted that when an element is referred to as "fixed to" or "provided on" another element, it can be directly on the other element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and are not the only embodiment.

[0059] Figure 1 Fig. 1 shows an assembly schematic diagram of the measuring device in a working state in an embodiment of the present application, Figure 2 Fig. 2 shows an assembly schematic diagram of the measuring device in another working state in an embodiment of the present application.

[0060] Before describing the measuring device 100 and the measuring method of the present application in detail, the structure of the measured object is briefly described. Referring to Figure 1 and Figure 2The centrifugal pump 200 includes a balance disc 210, a balance chamber cover 220, a thrust ring 230, an intermediate water chamber cover (not shown in the figure), an intermediate water chamber pump body 240, and a rotor shaft 250. The rotor shaft 250 is mounted on the intermediate water chamber pump body 240, and the rotor shaft 250 has a limiting groove 251 that extends smoothly along the circumference of the rotor shaft 250. The balance disc 210, the balance chamber cover 220, and the thrust ring 230 are all sleeved on the outside of the rotor shaft 250, and the balance disc 210 and the rotor shaft 250 are fixedly connected, while the balance disc 210 and the balance chamber cover 220 can be rotated relative to each other.

[0061] Figure 3 A schematic diagram of the assembly of the measuring device and the rotor shaft in one embodiment of the present invention is shown.

[0062] See Figure 3 For ease of description, in the following embodiments of this application, the axial direction of the rotor shaft 250 is taken as the first direction (e.g., Figure 3 As shown by the X-axis in the diagram, the second direction is the horizontal direction perpendicular to the rotor shaft 250 axis (as shown in the diagram). Figure 3 As shown by the Y-axis in the diagram, the vertical direction perpendicular to the rotor shaft 250 axis is taken as the third direction (e.g., Figure 3 (As shown by the Z-axis in the diagram). The first direction, the second direction, and the third direction are perpendicular to each other.

[0063] Continue reading Figure 3 and combined Figure 1 and Figure 2 This application provides a measuring device 100 for measuring the wear of the balance disc 210 of a centrifugal pump 200. The measuring device 100 includes a mounting base 110, a moving mechanism 120, and a detection device 130. The mounting base 110 is disposed at a fixed position on the rotor shaft 250, which is the standard position for each measurement. During the measurement process, the mounting base 110 remains stationary at this position on the rotor shaft 250. The moving mechanism 120 is mounted on the mounting base 110 and can reciprocate along a first direction (the axial direction of the rotor shaft 250). The detection device 130 is mounted on the side of the mounting base 110 away from the rotor shaft 250. (See also: [link to relevant documentation]). Figures 1 to 3 As shown, in Figure 1 and Figure 2 On the paper, the first measurement reference plane 241 is located on the left, and the second reference plane 242 is located on the right.

[0064] Thus, the intermediate water chamber cover plate is disassembled, the moving mechanism 120 is driven, when the moving mechanism 120 moves to the left along the first direction and abuts against the first measurement reference surface 241 of the intermediate water chamber pump body 240, at this time, the first measurement reference surface 241 generates a reaction force to the moving mechanism 120, since the moving mechanism 120 is fixed on the rotor shaft 250 through the mounting seat 110, the reaction force can push the rotor shaft 250 and the balance disc 210 to move to the right, finally the balance disc 210 and the balance chamber cover 220 are contacted, the detection device 130 can obtain a value, which is set as X1; when the rack 122 moves to the right along the first direction and abuts against the second measurement reference surface 242 of the intermediate water chamber pump body 240, the second measurement reference surface 242 generates a reaction force to the moving mechanism 120, the reaction force can push the rotor shaft 250 and the balance disc 210 to move to the left, finally the balance disc 210 and the thrust ring 230 are contacted, the detection device 130 can obtain a value, which is set as Y1.

[0065] By comparing X1 and X2 with the standard values X and Y, whether the balance disc 210 has wear on the two opposite sides can be determined. The standard values X and Y are measured before the centrifugal pump 200 is put into use, that is, before the balance disc 210 is worn by the above method. Specifically, if X1 < X, it indicates that the right side of the balance disc 210 has been worn, and the difference obtained by subtracting X1 from X is the wear amount of the right side of the balance disc 210, otherwise, no wear occurs; if Y1 > Y, it indicates that the left side of the balance disc 210 has been worn, and the difference obtained by subtracting Y from Y1 is the wear amount of the left side of the balance disc 210, otherwise, no wear occurs.

[0066] Thus, by using the measurement device 100 of the present application, the wear amount of the balance disc can be measured only by disassembling the intermediate water chamber cover plate, the operation is simple, the measurement efficiency is improved, and the measurement cost is reduced.

[0067] Figure 4 a schematic view showing a front view of the measurement device in an embodiment of the present application is shown, Figure 5 a schematic view showing a top view of the measurement device in an embodiment of the present application is shown, Figure 6 a schematic view showing a left view of the measurement device in an embodiment of the present application is shown.

[0068] Referring to Figures 4 to 6 and combining Figure 3The mounting seat 110 is used for detachably mounting the rotor shaft 250 of the centrifugal pump 200, and specifically, the mounting seat 110 comprises a clamp 111, a first clamping piece 112 and a second clamping piece 113. The clamp 111 is used for detachably mounting the rotor shaft 250 of the centrifugal pump 200, and the first clamping piece 112 and the second clamping piece 113 are oppositely mounted on the clamp 111 in the second direction and are used for clamping and fixing the rotor shaft 250.

[0069] In this way, the rotor shaft 250 is fixed at different axial positions on the rotor shaft 250 by the first clamping piece 112 and the second clamping piece 113, so as to ensure the relative fixation of the mounting seat 110 and the rotor shaft 250.

[0070] Figure 7 Fig. 4 shows a schematic view of an axial view of the clamp in an embodiment of the present application, Figure 8 Fig. 5 shows a schematic view of an elevation view of the clamp in an embodiment of the present application, Figure 9 Fig. 6 shows a schematic view of a top view of the clamp in an embodiment of the present application, Figure 10 Fig. 7 shows a schematic view of a left view of the clamp in an embodiment of the present application.

[0071] Referring to Figure 7 , and combining Figures 8 to 10 , one end of the clamp 111 is used for detachably mounting the rotor shaft 250, and the clamp 111 is mounted on one end of the rotor shaft 250 to form a positioning groove adapted to the rotor shaft 250. The positioning groove is in the shape of a circular arc, and the inner diameter of the positioning groove is substantially equal to the outer diameter of the rotor shaft 250.

[0072] In this way, the positioning groove and the limiting groove 251 formed on the rotor shaft 250 are matched to enable the clamp 111 to be fixedly clamped on the rotor shaft 250 through the positioning groove, so as to play a role of positioning and supporting the mounting seat 110. In addition, the inner diameter of the positioning groove is substantially equal to the outer diameter of the rotor shaft 250, so as to facilitate the mounting of the clamp 111 and improve the efficiency of assembly.

[0073] Further, the fixture 111 is spaced apart in the second direction to form a first mounting slot 1111 and a second mounting slot 1112, and the first mounting slot 1111 and the second mounting slot 1112 penetrate the fixture 111 in a third direction, and the slot widths of the first mounting slot 1111 and the second mounting slot 1112 in the first direction are equal. The first clamping piece 112 is generally in the shape of an inverted "L", and the first clamping piece 112 is inserted into the fixture 111 through the first mounting slot 1111, and a first arc-shaped slot 1121 is formed on a side of the first clamping piece 112 facing the second clamping piece 113, the first arc-shaped slot 1121 penetrates the first clamping piece 112 in the first direction, and from a side away from the rotor shaft 250 to a side close to the rotor shaft 250. The second clamping piece 113 is generally in the shape of a cuboid. The second clamping piece 113 is inserted into the fixture 111 through the second mounting slot 1112, and a second arc-shaped slot 1131 is formed on a side of the second clamping piece 113 facing the first clamping piece 112, the second arc-shaped slot 1131 penetrates the second clamping piece 113 in the first direction, and from a side away from the rotor shaft 250 to a side close to the rotor shaft 250. Wherein, the first arc-shaped slot 1121 and the second arc-shaped slot 1131 jointly define a mounting slot 114, and the mounting slot 114 can be used to fix the rotor shaft 250. In a preferred embodiment, the first clamping piece 112 and the second clamping piece 113 are both mounted on the fixture 111 through a pin shaft.

[0074] In this way, the first clamping piece 112 and the second clamping piece 113 are wrapped around the outer circumferential surface of the rotor shaft 250, and the contour shape of the first arc-shaped slot 1121 and the second arc-shaped slot 1131 fits the rotor shaft 250, that is, the mounting slot 114 can fit the outer circumferential surface of the rotor shaft 250, so that the first clamping piece 112 and the second clamping piece 113 can be jointly clamped on the rotor shaft 250, so as to provide another mounting position for the mounting seat 110, and further make the mounting seat 110 more firmly fixed on the rotor shaft 250, so as to avoid relative movement between the mounting seat 110 and the rotor shaft 250 during the movement of the moving mechanism 120, and affect the accuracy of the measurement result.

[0075] Again referring to Figure 4 In some embodiments, the second clamping piece 113 is provided with a third through hole 1132 in the second direction, and the third through hole 1132 penetrates the second clamping piece 113 in the second direction. The mounting seat 110 further comprises a pre-tightening screw 115, and the pre-tightening screw 115 extends into the third through hole 1132 to be mounted on the second clamping piece 113.

[0076] In this way, by tightening the pre-tightening screw 115, the second clamping piece 113 can be moved towards the first clamping piece 112, so as to clamp the rotor shaft 250 on the opposite sides of the first clamping piece 112 and the second clamping piece 113, thereby avoiding the sliding of the mounting seat 110 along the rotor shaft 250 under the action of force during the measurement process, and affecting the measurement result.

[0077] Referring again to Figure 4 , Figure 7 and Figure 8 , in some embodiments, the mounting base 110 further comprises a limiting plate 116. The limiting plate 116 is formed on the inner wall of the positioning groove of the clamp 111, and the limiting plate 116 is configured to increase in size in the second direction from the side close to the detection device 130 to the side away from the detection device 130, and the increasing manner is gradually increasing, and the projection of the limiting plate 116 on the plane perpendicular to the first direction is in the shape of a circular arc. The limiting plate 116 can be fitted into the limiting groove 251 opened on the rotor shaft 250.

[0078] It should be noted that the clamp 111 needs to support the entire mounting base 110, therefore, the thickness dimension of the portion of the clamp 111 mounted on the rotor shaft 250 along the first direction should be relatively large, and the limiting plate 116 is used to be mounted in the limiting groove 251 of the rotor shaft 250 to limit and position the mounting base 110, and is formed on the inner wall of the positioning groove of the clamp 111, obviously, the size of the limiting plate 116 along the first direction should be substantially equal to or less than the groove width of the limiting groove 251, that is, the thickness dimension of the portion of the clamp 111 mounted on the rotor shaft 250 along the first direction is greater than the size of the limiting plate 116 along the first direction.

[0079] In this way, by means of the limiting groove 251 and the limiting plate 116, the rotor shaft 251 can be mounted on the clamp 111, and the limiting plate 116 can limit the movement of the rotor shaft 250 in the first direction. When the moving mechanism 120 abuts against the inner wall of the intermediate water chamber pump body 240, under the reaction of the intermediate water chamber pump body 240, the mounting base 110 and the rotor shaft 250 move together in the first direction.

[0080] Further referring again to Figures 4 to 6 , the moving mechanism 120 is mounted on the mounting base 110, and the moving mechanism 120 can reciprocate along the first direction. Specifically, the moving mechanism 120 comprises a gear 121 and a rack 122, the gear 121 and the rack 122 are engaged, and the gear 121 is used to rotate in response to external force to drive the rack 122 to reciprocate along the first direction. The axis of the gear 121 extends along the third direction, the gear 121 is mounted in the stepped hole 1114 and located at the side close to the rotor shaft 250, and the gear 121 can rotate around its own axis.

[0081] Referring again to Figure 7 and Figure 9In some embodiments, a stepped hole 1113 is formed on the fixture 111, the axis of the stepped hole 1113 extends along the third direction, the diameter of the stepped hole 1113 far from the rotor shaft 250 is larger than the diameter of the stepped hole 1113 close to the rotor shaft 250, the gear 121 is arranged in the stepped hole 1113, the fixture 111 is further provided with a first through hole 1114, the first through hole 1114 penetrates the fixture 111 along the first direction, and the first through hole 1114 is in communication with the stepped hole 1113. The rack 122 is movably inserted into the fixture 111 through the first through hole 1114.

[0082] In some embodiments, the stepped hole 1113 can be a blind hole, the bottom of the stepped hole 1113 is closed, the part of the stepped hole 1113 close to the rotor shaft 250 is arranged as a blind hole to support the gear 121, which can prevent the gear 121 from falling off the fixture 111; the gear 121 is rotated around its axis by external force acting on the gear 121 to drive the rack 122 to move back and forth along the first direction. Alternatively, in other optional embodiments, the stepped hole 1113 can also be a through hole, the inner diameter of the part of the through hole at the bottom of the gear 121 is reduced to avoid falling.

[0083] Figure 11 Fig. 2 shows a schematic diagram of a top view of the gear in an embodiment of the present application, Figure 12 Fig. 3 shows a schematic diagram of a front view of the operating handle in an embodiment of the present application, Figure 13 Fig. 4 shows a schematic diagram of a front view of the operating handle and the gear assembly in an embodiment of the present application, Figure 14 Fig. 5 shows a schematic diagram of a top view of the operating handle and the gear assembly in an embodiment of the present application, Figure 15 Fig. 6 shows a schematic diagram of a left view of the operating handle and the gear assembly in an embodiment of the present application.

[0084] Referring to Figure 11 and Figure 12 In some embodiments, the moving mechanism 120 further comprises an operating handle 123. Referring to Figures 13 to 15 , the operating handle 123 is generally in the shape of a "T", one end of the operating handle 123 is mounted on the gear 121 through the mounting through hole 1211 of the gear 121 and the key 126, and the center of the operating handle 123 is arranged in coincidence with the axis of the gear 121.

[0085] In this way, the key 126 can prevent the relative rotation between the operating handle 123 and the gear 121, the rotation of the operating handle 123 can drive the rotation of the gear 121, and the rotation of the gear 121 can drive the movement of the rack 122 along the first direction through the meshing.

[0086] Referring again to Figures 4 to 6In some embodiments, the moving mechanism 120 further comprises two measuring contacts 124. The measuring contacts 124 are conical in shape, and the tips of the measuring contacts 124 are arranged to face away from the rack 122. Both of the measuring contacts 124 are mounted on the rack 122, and are located on opposite sides of the rack 122 along the first direction.

[0087] In this way, the rack 122 abuts the inner wall of the intermediate water chamber pump body in point contact with the measuring contacts 124. Figure 16 A schematic diagram showing a top view of the gear gland in an embodiment of the present application is shown.

[0088] Referring to Figure 16 In some embodiments, the moving mechanism 120 further comprises a gear gland 125. In combination with Figures 4 to 6 The gear gland 125 is a plate-shaped structure that is cylindrical in shape, and the axis of the gear gland 125 extends along the third direction. The gear gland 125 is mounted in the stepped hole 1113 on the side away from the rotor shaft 250, and the upper end surface of the gear gland 125 is flush with the upper surface of the fixture 111. The gear gland 125 is provided with a second through hole 1251 along the third direction, and the second through hole 1251 is coaxial with the center line of the gear gland 125. The operating handle 123 extends into the second through hole 1251 and the mounting through hole 1211 of the gear 121 in sequence.

[0089] In this way, the gear gland 125 can prevent dust and other foreign matter from falling onto the gear 121 through the stepped hole 1113, thereby affecting the rotation of the gear 121.

[0090] In an embodiment, the stepped hole 1113 is formed with two stepped surfaces, and the hole diameter of the stepped hole 1113 increases from the side close to the rotor shaft 250 to the side away from the rotor shaft 250. The gear 121 is mounted on the stepped surface close to the rotor shaft 250, and the gear gland 125 is mounted on the stepped surface away from the rotor shaft 250.

[0091] In this way, the stepped surface close to the rotor shaft 250 formed by the stepped hole 1113 supports the gear 121, which can prevent the gear 121 from falling out of the fixture 111.

[0092] Continuing to refer to Figure 3 and Figure 5 The detection device 130 is mounted on the side of the mounting seat 110 away from the rotor shaft 250, and is used to measure the wear of the balance disc 210. Preferably, the detection device 130 is a laser displacement sensor. In this way, the detection device 130 uses non-contact measurement, which has high measurement accuracy and good repeatability.

[0093] Figure 17 A flowchart showing the measurement method in the present application is shown.

[0094] Referring to Figure 17 According to another aspect of the present application, there is provided a measurement method for measuring the wear of the balance disc 210 using the measurement device 100 described above; the second measurement reference surface 242 is closer to the balance disc 210 than the first measurement reference surface 241; the measurement method comprises the following measurement steps:

[0095] S110, mounting the mounting seat 110 on the rotor shaft 250;

[0096] Specifically, the entire measurement device 100 is mounted on the rotor shaft 250 by mounting the fixture 111, the first clamping member 112 and the second clamping member 112 on the rotor shaft 250, and the measurement device 100 is fastened by the pre-tightening screw 115.

[0097] S120, driving the moving mechanism 120 to move in the first direction until the moving mechanism 120 abuts against the first measurement reference surface 241, and measuring the distance between the detection device 130 and the second measurement reference surface 242 by the detection device 130; and / or, driving the moving mechanism 120 to move in the second direction until the moving mechanism 120 abuts against the second measurement reference surface 242, and measuring the distance between the detection device 130 and the second measurement reference surface 242 by the detection device 130.

[0098] Specifically, taking the rack 122 as an example, the direction of the rack 122 approaching the balance disc 210 in the first direction is defined as the right side, and the direction of the rack 122 moving away from the balance disc 210 in the first direction is defined as the left side. Figure 1 Clockwise rotating the operating handle 123 drives the gear 121 to rotate to drive the rack 122 to move to the left in the first direction, and the measurement contact 124 on the left side of the rack 122 abuts against the first measurement reference surface 241. At this time, the rack 122 remains in a stationary state, the first measurement reference surface 241 drives the gear 121 to rotate along the rack 122 by reaction, the gear 121 drives the fixture 111 to move to the right in the first direction, the fixture 111 drives the rotor shaft 250 to move to the right in the first direction, the rotor shaft 250 drives the balance disc 210 to move to the right in the first direction, until the balance disc 210 contacts the balance chamber cover 220. At this time, the detection device 130 emits laser and receives the laser reflected by the second measurement reference surface 242, to obtain the distance between the detection device 130 and the second measurement reference surface 242, which is X1 described above, and then to obtain the first wear, which is the difference between X and X1.

[0099] S130, if the first wear is greater than the first preset value, replacing the balance disc 210;

[0100] Specifically, the first preset value is an upper limit value of the wear amount of the right side of the balance disc 210 according to the actual operation requirement of the balance disc 210, and if the wear amount of the right side of the balance disc 210 has exceeded the first preset value, the normal operation of the centrifugal pump 200 will be affected, and the balance disc 210 needs to be replaced in time.

[0101] Figure 18 Another flowchart of the measurement method in the application is shown.

[0102] Referring to Figure 18 , S140, if the first wear amount is not greater than the first preset value, the moving mechanism 120 is driven to move to the other one of the first measurement reference surface 241 and the second measurement reference surface 242 abutting against the moving mechanism 120 in the first direction, and the distance between the detection device 130 and the second measurement reference surface 242 is measured by the detection device 130 to determine the second wear amount of the balance disc 210.

[0103] Specifically, taking Figure 2 as an example, the direction of the rack 122 moving close to the balance disc 210 in the first direction is defined as the right side, and the direction of the rack 122 moving away from the balance disc 210 in the first direction is defined as the left side. The handle 123 is rotated counterclockwise to drive the gear 121 to rotate to drive the rack 122 to move to the right in the first direction, and the measurement contact 124 on the right side of the rack 122 abuts against the second measurement reference surface 242. At this time, the rack 122 remains in a stationary state, the second measurement reference surface 242 drives the gear 121 to rotate along the rack 122 through reaction, the gear 121 drives the clamp 111 to move to the left in the first direction, the clamp 111 drives the rotor shaft 250 to move to the left in the first direction, and the rotor shaft 250 drives the balance disc 210 to move to the left in the first direction until the balance disc 210 contacts the thrust ring 230. At this time, the detection device 130 emits laser and receives the laser reflected by the second measurement reference surface 242 to obtain the distance between the detection device 130 and the second measurement reference surface 242, which is Y1, and then the second wear amount is obtained by subtracting Y from Y1.

[0104] S150, if the second wear amount is greater than the second preset value, the balance disc 210 is replaced.

[0105] Specifically, the second preset value is an upper limit value of the wear amount of the left side of the balance disc 210 according to the actual operation requirement of the balance disc 210, and if the wear amount of the left side of the balance disc 210 has exceeded the second preset value, the normal operation of the centrifugal pump 200 will be affected, and the balance disc 210 needs to be replaced in time.

[0106] It should be noted that, in order to save time and improve the efficiency of measurement, the above steps S120 and S140 can be interchanged during the measurement process, that is, whether the moving mechanism 120 first abuts against the first measurement reference surface 241 or the second measurement reference surface 242, as long as the measurement result is that wear has occurred on the side of the balance disc 210 and the wear amount exceeds the standard value, it can be determined that the balance disc 210 needs to be replaced, at this time there is no need to continue to measure whether wear has occurred on the other side of the balance disc 210.

[0107] In some embodiments, before installing the measuring device 100 on the rotor shaft 250, further comprising: disassembling the intermediate water chamber cover plate of the centrifugal pump 200;

[0108] Specifically, the centrifugal pump 200 is closed, and the intermediate water chamber cover plate is disassembled by a disassembly tool, so as to facilitate the subsequent installation of the measuring device 100 on the rotor shaft 250 to measure the wear amount of the balance disc 210.

[0109] It should be noted that before driving the moving mechanism 120 to move in the first horizontal direction, the intermediate water chamber cover plate needs to be disassembled, and the moving mechanism 120 is repeatedly driven to move in the first direction until the moving mechanism 120 abuts against one of the first measurement reference surface 241 and the second measurement reference surface 242, and the distance between the detection device 130 and the second measurement reference surface 142 is measured by the detection device 130 to determine the first reference wear amount of the balance disc 210. If the first wear amount is not greater than the first preset value, the moving mechanism 120 is repeatedly driven to move in the first direction until the moving mechanism 120 abuts against the other one of the first measurement reference surface 241 and the second measurement reference surface 242, and the distance between the detection device 130 and the second measurement reference surface 242 is measured by the detection device 130 to determine the second reference wear amount of the balance disc 210. The first reference wear amount and the second reference wear amount measured are used as the reference of the first reference wear amount and the second reference wear amount. After the first reference wear amount and the second reference wear amount are measured, the intermediate water chamber cover plate is installed, the centrifugal pump 200 is started, and after the centrifugal pump 200 runs for a period of time, the centrifugal pump 200 is closed. The intermediate water chamber cover plate is disassembled again, and the first wear amount and the second wear amount of the balance disc 210 are measured. The absolute value of the difference between the first reference wear amount and the first wear amount is used as the actual wear amount of the right side of the balance disc 210, and the absolute value of the difference between the second reference wear amount and the second wear amount is used as the actual wear amount of the left side of the balance disc 210.

[0110] In actual operation of the centrifugal pump 200, when the right side of the balance disc 210 is worn, the first wear amount is less than the first reference wear amount, and the wear amount of the right side of the balance disc 210 is equal to the difference between the first reference wear amount and the first wear amount; when the left side of the balance disc 210 is worn, the second wear amount is greater than the second reference wear amount, and the wear amount of the left side of the balance disc 210 is equal to the difference between the second wear amount and the second reference wear amount; when the wear amount of the right side of the balance disc 210 (i.e., the difference between the first reference wear amount and the first wear amount) is greater than the first preset value and / or the wear amount of the left side of the balance disc 210 (i.e., the difference between the second wear amount and the second reference wear amount) is greater than the second preset value, it is determined that the wear amount of the balance disc 210 exceeds the standard, and the balance disc 210 needs to be replaced, and the balance chamber cover 220 is also replaced.

[0111] In summary, the application provides a measuring device 100 and a measuring method. The intermediate water chamber cover plate is removed, and the rotor shaft 250 can be installed by means of the mounting seat 110, which is simple to disassemble and assemble and saves time. The gear 121 can be driven to rotate by rotating the operation handle 123, and the gear 121 can drive the rack 122 to move in the first direction. When the rack 122 moves to the left side of the moving mechanism 120 and abuts against the first measurement reference surface 241 in the first direction, the reaction force of the first measurement reference surface 241 on the moving mechanism 120 pushes the rotor shaft 250 and the balance disc 210 to move to the right, and finally the balance disc 210 and the balance chamber cover 220 are in contact, and the detection device 130 can measure the wear amount of the right side of the balance disc 210. When the rack 122 moves to the right side of the moving mechanism 120 and abuts against the second measurement reference surface 242 in the first direction, the reaction force of the second measurement reference surface 242 on the moving mechanism 120 pushes the rotor shaft 250 and the balance disc 210 to move to the left, and finally the balance disc 210 and the thrust ring 230 are in contact, and the detection device 130 can measure the wear amount of the left side of the balance disc 210. In this way, the reaction force of the intermediate water chamber pump body 240 on the moving mechanism 120 can push the rotor shaft 250 and the balance disc 210 to move, and drive the detection device 130 to move. The distance between the detection device 130 and the second measurement reference surface 242 is measured by the detection device 130, which is equivalent to the wear amount of the balance disc 210, and the detection device 130 is a non-contact distance measuring device with high accuracy.

[0112] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, but as long as the combinations of the technical features do not contradict, they should be considered within the scope of the present disclosure.

[0113] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are within the scope of protection of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A measuring device for measuring the wear amount of a balance disc of a centrifugal pump, the centrifugal pump comprising a rotor shaft, an intermediate water chamber pump body, and a balance disc, the rotor shaft being provided in the intermediate water chamber pump body, the balance disc being sleeved on the rotor shaft and located in the intermediate water chamber pump body; characterized in that, The opposite two inner sides of the intermediate water chamber pump body along a first direction are respectively formed with a first measurement reference surface and a second measurement reference surface, the first direction being an axial direction of the rotor shaft; the measurement device comprises: A mounting seat for detachably mounting a standard position on the rotor shaft of the centrifugal pump; the mounting seat comprises a clamp, a first clamping piece and a second clamping piece; the clamp is provided with a first mounting groove and a second mounting groove spaced apart along a second direction; the first clamping piece is inserted into the clamp through the first mounting groove; the second clamping piece is inserted into the clamp through the second mounting groove; wherein one side of the first clamping piece and the second clamping piece facing each other is respectively provided with a first arc-shaped groove and a second arc-shaped groove, and the first arc-shaped groove and the second arc-shaped groove jointly define a mounting groove to clamp the rotor shaft; the first direction and the second direction are perpendicular; A moving mechanism mounted on the mounting seat, which can reciprocate along the first direction; and A detection device mounted on the mounting seat, which is used to measure the distance to the second measurement reference surface when the moving mechanism respectively abuts against the first measurement reference surface and / or the second measurement reference surface.

2. The measurement device according to claim 1, wherein One end of the clamp is formed with a positioning groove matched with the rotor shaft.

3. The measuring device of claim 2, wherein, The mounting seat further comprises a limiting plate; The limiting plate is arc-shaped and formed on the inner wall of the positioning groove of the clamp, and is used to accommodate a limiting groove on the rotor shaft.

4. The measuring device of claim 2, wherein, The clamp is further provided with a first through hole penetrating through the clamp along the first direction; The moving mechanism comprises a gear and a rack; the gear is rotatably mounted on the clamp, and the axis of the gear extends along a third direction; the rack is movably inserted into the clamp through the first through hole; the gear is engaged with the rack; The first direction, the second direction and the third direction are perpendicular to each other.

5. The measuring device of claim 4, wherein, The moving mechanism further comprises an operating handle; One end of the operating handle is mounted on the gear to drive the gear to rotate around its own central axis.

6. The measuring device of claim 4, wherein, The moving mechanism further comprises two measurement contacts; The two measurement contacts are mounted on the rack, and the two measurement contacts are respectively located on the opposite sides of the rack along the first direction.

7. The measuring device of claim 4, wherein, The moving mechanism further comprises a gear gland; the clamp is formed with a stepped hole, the hole diameter of the portion of the stepped hole away from the rotor shaft is larger than the hole diameter of the portion of the stepped hole close to the rotor shaft, the gear is arranged in the stepped hole, and the gear gland is fixedly mounted on the step surface of the stepped hole.

8. The measuring device of claim 7, wherein, The stepped hole is formed with two step surfaces, and the hole diameter of the stepped hole increases from the side close to the rotor shaft to the side away from the rotor shaft; the gear is mounted on the step surface close to the rotor shaft, and the gear gland is mounted on the step surface away from the rotor shaft.

9. The measuring device of claim 1, wherein, The second clamping piece is provided with a third through hole along the second direction, and the mounting seat further comprises a pre-tightening screw. The pre-tightening screw extends into the third through hole to be mounted on the second clamping member, and one end of the pre-tightening screw abuts against one side of the first clamping member facing the second clamping member to drive the second clamping member to move towards the first clamping member.

10. A method of measurement, characterized by, The measuring method comprises the following measuring steps by using the measuring device according to any one of claims 1 to 9: mounting the mounting seat on the rotor shaft; driving the moving mechanism to move in the first direction until the moving mechanism abuts against the first measuring reference surface, and measuring the distance between the detecting device and the second measuring reference surface by the detecting device; and / or driving the moving mechanism to move in the second direction until the moving mechanism abuts against the second measuring reference surface, and measuring the distance between the detecting device and the second measuring reference surface by the detecting device.

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