CN115235678A - Measuring device and measuring method - Google Patents

Abstract

The invention relates to a measuring device and a measuring method, wherein the measuring device comprises: the mounting seat is used for detachably mounting a rotor shaft of the centrifugal pump; the moving mechanism is arranged on the mounting seat and can reciprocate along a first direction; and the detection device is arranged on one side of the mounting seat, which is far away from the rotor shaft. Above-mentioned measuring device pulls down middle hydroecium apron, through mount pad installation rotor shaft, through the relative both sides butt in the inside wall of the middle hydroecium pump body of moving mechanism along first direction, the reaction force of the inside wall of the middle hydroecium pump body promotes rotor shaft and mount pad and removes, and rethread detection device measures the distance of second measurement reference surface and detection device, but this distance equivalence is the total wear volume of balance disk and balance chamber apron. So, only need the middle water chamber apron of dismouting, simplified the measuring procedure, improved work efficiency to detection device is contactless's measuring distance, and the degree of accuracy is high.

Description

Measuring device and measuring method

Technical Field

The invention relates to the technical field of wear of a balance disc of a centrifugal pump, in particular to a measuring device and a measuring method.

Background

Centrifugal pumps are pumps that transport liquids by centrifugal force generated when an impeller rotates, and are widely used in the industries of electricity, metallurgy, coal, building materials, and the like to transport slurries containing solid particles. The TWL-45S type centrifugal pump is one kind of centrifugal pump, when the TWL-45S type centrifugal pump is opened and stopped and the operating mode changes, because the pressure that the front and back apron of impeller received is unequal, the suction inlet lateral pressure is little, outlet side pressure is big, the rotor subassembly can produce very big axial force under the pressure differential effect, the axial force can produce the pulsation and make the rotor take place the axial float, and then lead to producing the axial wear between balance disc and the balance chamber cap, need change balance disc and balance chamber cap when the wearing and tearing volume reaches certain degree, in order to guarantee the normal operating of centrifugal pump.

In the prior art, two schemes are used for measuring the total wear rate of a balance disc and a balance chamber cover, one scheme is to disassemble a centrifugal pump, disassemble the balance disc and the balance chamber cover and then directly measure; the other method is to disassemble pipelines such as a steam side balance pipe, a main steam valve/regulating valve stuffing box steam guide pipe and the like, install an auxiliary tool at the steam end of the rotor, push/pull the rotor by the auxiliary tool to measure the axial displacement of the rotor, and calculate the abrasion loss through the change of the axial displacement of the rotor.

Both the two methods need to disassemble more parts, the disassembly and assembly workload is large, the measurement efficiency is low, and in addition, the risk that foreign matters fall into the centrifugal pump is avoided.

Disclosure of Invention

In view of the above, it is necessary to provide a measuring apparatus and a measuring method with high measuring efficiency and simple assembly and disassembly for solving the problems of large workload and low efficiency in measuring the total wear amount of the balance disk and the balance chamber cover in the prior art.

According to an aspect of the present application, an embodiment of the present application provides a measuring apparatus for measuring an abrasion loss of a balance disc of a centrifugal pump, where the centrifugal pump includes a rotor shaft, an intermediate water chamber pump body, and a balance disc, the rotor shaft is disposed in the intermediate water chamber pump body, and the balance disc is sleeved on the rotor shaft and located in the intermediate water chamber pump body; a first measuring reference surface and a second measuring reference surface are respectively formed on two opposite inner side surfaces of the middle water chamber pump body along a first direction, and the first direction is the axial direction of the rotor shaft; the measuring device includes:

a mounting seat for removably mounting a standard location on a rotor shaft of the centrifugal pump;

a moving mechanism mounted to the mount, the moving mechanism being capable of reciprocating in the first direction; and

and a detection device mounted on the mounting base, the detection device being configured to measure a distance to the second measurement reference surface when the moving mechanism abuts against the first measurement reference surface and/or the second measurement reference surface, respectively.

In one embodiment, the mount includes a clamp;

and one end of the fixture is provided with a positioning groove matched with the rotor shaft.

In one embodiment, the mount further comprises a first clamp and a second clamp; the fixture is provided with a first mounting groove and a second mounting groove at intervals along a second direction;

the first clamping piece is inserted into the fixture through the first mounting groove;

the second clamping piece is inserted into the fixture through the second mounting groove;

the first clamping piece and the second clamping piece are provided with a first arc-shaped groove and a second arc-shaped groove on one side facing each other, and the first arc-shaped groove and the second arc-shaped groove define a mounting groove together to clamp the rotor shaft;

the first direction and the second direction are perpendicular.

In one embodiment, the mount further comprises a limiting plate;

the limiting plate is arc-shaped and is formed on the inner wall of the positioning groove of the fixture, and the limiting plate is used for being accommodated in the limiting groove in the rotor shaft.

In one embodiment, the fixture is further provided with a first through hole, and the first through hole penetrates through the fixture along the first direction;

the moving mechanism comprises a gear and a rack; the gear is rotatably arranged on the fixture, the axis of the gear extends along a third direction, and the rack is movably inserted into the fixture through the first through hole; the gear is meshed with the rack;

the first direction, the second direction and the third direction are perpendicular to each other.

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

one end of the operating handle is arranged on the gear and used for driving the gear to rotate around the central axis of the gear.

In one embodiment, the moving mechanism further comprises two measuring contacts;

the two measuring contacts are arranged on the rack, and the two measuring contacts are respectively positioned on two opposite sides of the rack along the first direction.

In one embodiment, the moving mechanism further comprises a gear gland; the fixture is provided with a stepped hole, the diameter of the stepped hole far away from the rotor shaft is larger than that of the part close to the rotor shaft, the gear is arranged in the stepped hole, and the gear gland is fixedly arranged on the stepped surface of the stepped hole.

In one embodiment, 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 installed on the second clamping piece, and one end of the pre-tightening screw abuts against one side, facing the second clamping piece, of the first clamping piece so as to drive the second clamping piece to move towards the first clamping piece.

According to another aspect of the present application, an embodiment of the present application provides a measurement method, which employs the measurement apparatus described above; the measuring method comprises the following measuring steps:

mounting the mount to the rotor shaft;

driving the moving mechanism to move along the first direction until the moving mechanism abuts against the first measuring reference surface, and measuring the distance between the detection device and the second measuring reference surface through the detection device; and/or driving the moving mechanism to move along the second direction until the moving mechanism abuts against the second measuring reference surface, and measuring the distance between the detection device and the second measuring reference surface through the detection device.

According to the measuring device, the middle water chamber cover plate is detached, the rotor shaft is installed through the installation seat, the relative two sides of the driving moving mechanism along the first direction are abutted to the inner side wall of the middle water chamber pump body, the reaction force generated by the inner side wall of the middle water chamber pump body can push the rotor shaft and the installation seat to move, then the distance between the second measuring reference surface and the detecting device is measured through the detecting device, and the distance can be equivalent to the abrasion loss of the balance disc. So, only need the middle water chamber apron of dismouting promptly measurable quantity, simplified measurement procedure, improved work efficiency to detection device is contactless's measuring distance, and the degree of accuracy is high.

Drawings

FIG. 1 is an assembled view of the measuring device of the present invention in an operational state;

FIG. 2 is an assembled view of the measuring device of the present invention in another operating state;

FIG. 3 is a schematic view of the assembly of the measuring device and the rotor shaft according to the present invention;

FIG. 4 is a schematic view of a front view of the measuring device of the present invention;

FIG. 5 is a schematic diagram of a top view of a measuring device according to the present invention;

FIG. 6 is a schematic left side view of a measuring device according to the present invention;

figure 7 is a schematic isometric view of a clamp of the present invention;

figure 8 is a schematic front view of a fixture according to the invention;

figure 9 is a schematic top view of a fixture according to the invention;

figure 10 is a schematic left side view of a clamp according to the present invention;

FIG. 11 is a schematic illustration of a top view of a gear in the present invention;

FIG. 12 is a schematic front view of the operating handle of the present invention;

FIG. 13 is a schematic front view of the operating handle and gear assembly of the present invention;

FIG. 14 is a schematic illustration of a top view of the operating handle and gear assembly of the present invention;

FIG. 15 is a schematic left side view of the operating handle and gear assembly of the present invention;

FIG. 16 is a schematic diagram of a top view of a gear gland of the present invention;

FIG. 17 is a schematic flow chart of a measurement method according to the present invention;

FIG. 18 is another flow chart of the measurement method of the present invention.

The reference numbers illustrate:

100. a measuring device; 110. a mounting base; 111. a fixture; 1111. a first mounting groove; 1112. a second mounting groove; 1113. a stepped hole; 1114. a first through hole; 112. a first clamping member; 1121. a first arc-shaped slot; 113. a second clamping member; 1131. a second arc-shaped slot; 1132. a third through hole; 114. mounting grooves; 115. pre-tightening the screw; 116. a limiting plate; 120. a moving mechanism; 121. a gear; 1211. mounting a through hole; 122. a rack; 123. an operating handle; 124. measuring a contact; 125. a gear gland; 1251. a second through hole; 126. a key; 130. a detection device; 200. a centrifugal pump; 210. a balance disc; 220. a balance chamber cover; 230. a thrust ring; 240. a middle water chamber pump body; 241. a first measurement datum plane; 242. a second measurement datum plane; 250. a rotor shaft; 251. a limiting groove.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Fig. 1 shows an assembly diagram of a measuring device in an operating state according to an embodiment of the present invention, and fig. 2 shows an assembly diagram of a measuring device in another operating state according to an embodiment of the present invention.

Before describing the measuring apparatus 100 and the measuring method of the present application in detail, the structure of the measured object will be briefly described. Referring to fig. 1 and 2, the centrifugal pump 200 includes a balance disk 210, a balance chamber cover 220, a thrust collar 230, an intermediate water chamber cover plate (not shown), an intermediate water chamber pump body 240, and a rotor shaft 250. The rotor shaft 250 is installed in the middle water chamber pump body 240, the rotor shaft 250 is provided with a limit groove 251, and the limit groove 251 extends smoothly along the circumferential direction of the rotor shaft 250. The balance disk 210, the balance chamber cover 220 and the thrust collar 230 are all sleeved outside the rotor shaft 250, the balance disk 210 is fixedly connected with the rotor shaft 250, and the balance disk 210 and the balance chamber cover 220 can be arranged in a relative rotation mode.

Fig. 3 shows a schematic view of the assembly of the measuring device and the rotor shaft according to an embodiment of the invention.

Referring to fig. 3, for convenience of description, in the following embodiments of the present application, an axial direction of the rotor shaft 250 is taken as a first direction (as indicated by an X axis in fig. 3), a horizontal direction perpendicular to the axial direction of the rotor shaft 250 is taken as a second direction (as indicated by a Y axis in fig. 3), and a vertical direction perpendicular to the axial direction of the rotor shaft 250 is taken as a third direction (as indicated by a Z axis in fig. 3). Wherein the first direction, the second direction and the third direction are mutually perpendicular to each other.

With continuing reference to fig. 3 and with reference to fig. 1 and fig. 2, the present application provides a measuring apparatus 100 for measuring the wear amount of a balance disc 210 of a centrifugal pump 200, wherein the measuring apparatus 100 includes a mounting base 110, a moving mechanism 120 and a detecting apparatus 130, the mounting base 110 is disposed at a fixed position of a rotor shaft 250, the fixed position is a standard position for each measurement, during the measurement, the mounting base 110 is kept at the position of the rotor shaft 250, the moving mechanism 120 is mounted on the mounting base 110, the moving mechanism 120 can move back and forth along a first direction (axial direction of the rotor shaft 250), and the detecting apparatus 130 is mounted on a side of the mounting base 110 away from the rotor shaft 250. As shown in fig. 1 to fig. 3, on the paper surface of fig. 1 and fig. 2, the first measurement reference plane 241 is located on the left side, and the second reference plane 242 is located on the right side.

In this way, the middle water chamber cover plate is detached, the moving mechanism 120 is driven, and when the moving mechanism 120 moves leftwards along the first direction and abuts against the first measuring reference surface 241 of the middle water chamber pump body 240, at this time, the first measuring reference surface 241 generates a reaction force on the moving mechanism 120, and 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 disk 210 to move rightwards, and finally the balance disk 210 and the balance chamber cover 220 are in contact, and the detection device 130 can obtain a value, which is set as X1; when the rack 122 moves rightward in the first direction and abuts against the second measuring reference surface 242 of the middle water chamber pump body 240, the second measuring reference surface 242 generates a reaction force to the moving mechanism 120, the reaction force can push the rotor shaft 250 and the balance disk 210 to move leftward, and finally the balance disk 210 and the thrust collar 230 are in contact, and the detecting device 130 can obtain a value, which is set as Y1.

By comparing X1 and X2 to the norm X, Y, it can be determined whether there is wear on opposite sides of the balance disk 210. Therein, the standard value X, Y is measured before the centrifugal pump 200 is put into service, i.e., before the balance disk 210 is not worn by the method described above. 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 amount of wear on the left side of the balance disc 210, otherwise, no wear occurs.

So, adopt measuring device 100 of this application, only need dismantle the wearing and tearing volume of middle water chamber apron measurable quantity balance dish promptly, easy operation has improved measurement of efficiency, has reduced measurement cost.

Fig. 4 shows a schematic diagram of a front view of a measuring device in an embodiment of the invention, fig. 5 shows a schematic diagram of a top view of a measuring device in an embodiment of the invention, and fig. 6 shows a schematic diagram of a left side view of a measuring device in an embodiment of the invention.

Referring to fig. 4-6 in conjunction with fig. 3, the mounting block 110 is used to removably mount the rotor shaft 250 of the centrifugal pump 200, and specifically, the mounting block 110 includes a fixture 111, a first clamping member 112, and a second clamping member 113. The fixture 111 is used for detachably mounting the rotor shaft 250 of the centrifugal pump 200, and the first and second clamping members 112 and 113 are oppositely mounted to the fixture 111 in the second direction and are used for clamping and fixing the rotor shaft 250.

In this way, the rotor shaft 250 is fixed at different positions on the rotor shaft 250 axially by the first clamping member 112 and the second clamping member 113, so that the mounting seat 110 and the rotor shaft 250 are ensured to be fixed relatively.

Figure 7 shows a schematic view of an isometric view of a clamp in an embodiment of the invention, figure 8 shows a schematic view of a front view of a clamp in an embodiment of the invention, figure 9 shows a schematic view of a top view of a clamp in an embodiment of the invention, and figure 10 shows a schematic view of a left side view of a clamp in an embodiment of the invention.

Referring to fig. 7 in conjunction with fig. 8 to 10, one end of the fixture 111 is used for detachably mounting the rotor shaft 250, and the fixture 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 arc-shaped, and an inner diameter of the positioning groove is substantially equal to an outer diameter of the rotor shaft 250.

Like this, the spacing groove 251 cooperation that constant head tank and rotor shaft 250 seted up to make fixture 111 fix the joint on rotor shaft 250 through the constant head tank, and then play the effect of location and support to mount pad 110, and the internal diameter of constant head tank is substantially equal to the external diameter of rotor shaft 250, so that installation fixture 111, the efficiency of improvement assembly.

Further, the fixture 111 is provided with a first mounting groove 1111 and a second mounting groove 1112 at intervals along the second direction, the first mounting groove 1111 and the second mounting groove 1112 penetrate through the fixture 111 along the third direction, and the groove widths of the first mounting groove 1111 and the second mounting groove 1112 along the first direction are equal. The first clamping member 112 is generally inverted "L" shaped, the first clamping member 112 is inserted into the fixture 111 through the first mounting groove 1111, a first arc-shaped groove 1121 is formed in one side of the first clamping member 112 facing the second clamping member 113, and the first arc-shaped groove 1121 penetrates through the first clamping member 112 along the first direction from the side far away from the rotor shaft 250 to the side close to the rotor shaft 250. The second clamp 113 is substantially rectangular in shape as a whole. The second clamping member 113 is inserted into the fixture 111 through the second mounting groove 1112, a second arc-shaped groove 1131 is formed in one side of the second clamping member 113 facing the first clamping member 112, and the second arc-shaped groove 1131 penetrates through the second clamping member 113 along the first direction from the side far away from the rotor shaft 250 to the side close to the rotor shaft 250. Wherein the first arc-shaped slot 1121 and the second arc-shaped slot 1131 together define a mounting slot 114, and the mounting slot 114 can be used for fixing the rotor shaft 250. In a preferred embodiment, first clamping member 112 and second clamping member 113 are each pivotally mounted to clamp 111.

Thus, the first clamping member 112 and the second clamping member 113 are wrapped on the outer circumferential surface of the rotor shaft 250, and the first arc-shaped groove 1121 and the second arc-shaped groove 1131 are fitted to the rotor shaft 250 in terms of the contour shape, that is, the mounting groove 114 can be fitted to the outer circumferential surface of the rotor shaft 250, so that the first clamping member 112 and the second clamping member 113 can be clamped to the rotor shaft 250 together to provide another mounting position for the mounting base 110, and further, the mounting base 110 is more firmly and fixedly mounted on the rotor shaft 250, thereby preventing the mounting base 110 and the rotor shaft 250 from moving relatively in the moving process of the moving mechanism 120 and affecting the accuracy of the measurement result.

Referring to fig. 4 again, in some embodiments, the second clamping member 113 is opened with a third through hole 1132 along the second direction, and the third through hole 1132 penetrates through the second clamping member 113 along the second direction. The mounting base 110 further includes 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 member 113.

In this way, by tightening the pre-tightening screw 115, the second clamping member 113 can move towards the first clamping member 112, so that the rotor shaft 250 is clamped by the first clamping member 112 at two opposite sides, and the influence on the measurement result caused by the sliding of the mounting base 110 along the rotor shaft 250 after being subjected to an acting force in the measurement process is avoided.

Referring again to fig. 4, 7 and 8, in some embodiments, the mount 110 further includes a limiting plate 116. The limiting plate 116 is formed on the inner wall of the positioning groove of the fixture 111, and from a side close to the detecting device 130 to a side far from the detecting device 130, the limiting plate 116 is configured to increase in size in the second direction in a gradually increasing manner, and a projection of the limiting plate 116 on a plane perpendicular to the first direction is in a circular arc shape. The limit plate 116 can be fitted in a limit groove 251 formed in the rotor shaft 250.

It should be noted that the fixture 111 needs to support the entire mounting seat 110, and therefore, the thickness dimension of the portion of the fixture 111 mounted on the rotor shaft 250 along the first direction should be larger, and the limiting plate 116 is formed on the inner wall of the positioning groove of the fixture 111 for being mounted in the limiting groove 251 of the rotor shaft 250 to limit and position the mounting seat 110, and obviously, the dimension of the limiting plate 116 along the first direction should be substantially equal to or smaller than the groove width of the limiting groove 251, that is, the thickness dimension of the portion of the fixture 111 mounted on the rotor shaft 250 along the first direction is larger than the dimension of the limiting plate 116 along the first direction.

In this way, the rotor shaft 251 can be attached to the jig 111 by the stopper groove 251 and the stopper plate 116, and the stopper plate 116 can restrict the movement of the rotor shaft 250 in the first direction. When the moving mechanism 120 abuts against the inner wall of the middle header pump body 240, the mount 110 and the rotor shaft 250 move together in the first direction by the reaction of the middle header pump body 240.

Further, referring to fig. 4 to 6 again, the moving mechanism 120 is mounted on the mounting base 110, and the moving mechanism 120 can move back and forth along the first direction. Specifically, the moving mechanism 120 includes a gear 121 and a rack 122, the gear 121 is engaged with the rack 122, and the gear 121 is configured to rotate in response to an external force to drive the rack 122 to move back and forth along a first direction. The axis of the gear 121 extends in the third direction, the gear 121 is installed in the stepped hole 1114 on the side close to the rotor shaft 250, and the gear 121 can rotate about its own axis.

Referring to fig. 7 and 9 again, in some embodiments, a stepped hole 1113 is formed in the fixture 111, an axis of the stepped hole 1113 extends in the third direction, a diameter of a portion of the stepped hole 1113 away from the rotor shaft 250 is larger than a diameter of a portion of the stepped hole 111close to the rotor shaft 250, the gear 121 is disposed in the stepped hole 1113, the fixture 111 further defines a first through hole 1114, the first through hole 1114 penetrates through the fixture 111 in 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.

Wherein, the stepped hole 1113 may be a blind hole whose bottom is closed, and the gear 121 can be prevented from falling out of the jig 111 by setting a portion of the stepped hole 1113 near the rotor shaft 250 as a blind hole to support the gear 121; the gear 121 is rotated around its axis by an external force acting on the gear 121, so as to drive the rack 122 to move back and forth along the first direction. Alternatively, in other alternative embodiments, the stepped hole 1113 may be a through hole, and the inner diameter of the hole of the portion of the bottom of the gear 121 is reduced to avoid dropping.

Fig. 11 is a schematic diagram showing a top view of a gear in an embodiment of the present invention, fig. 12 is a schematic diagram showing a front view of an operating handle in an embodiment of the present invention, fig. 13 is a schematic diagram showing a front view of an operating handle and gear assembly in an embodiment of the present invention, fig. 14 is a schematic diagram showing a top view of an operating handle and gear assembly in an embodiment of the present invention, and fig. 15 is a schematic diagram showing a left side view of an operating handle and gear assembly in an embodiment of the present invention.

Referring to fig. 11 and 12, in some embodiments, the moving mechanism 120 further includes an operating handle 123. Referring to fig. 13 to 15, the operating handle 123 is substantially T-shaped as a whole, one end of the operating handle 123 is attached to the gear 121 via an attachment through hole 1211 formed by the key 126 and the gear 121, and the center of the operating handle 123 is disposed to overlap the axis of the gear 121.

In this way, the key 126 can prevent relative rotation between the operating handle 123 and the gear 121, and by rotating the operating handle 123, the gear 121 can be driven to rotate, and by meshing, the rotation of the gear 121 can drive the rack 122 to move in the first direction.

Referring again to fig. 4-6, in some embodiments, the moving mechanism 120 further includes two measuring contacts 124. The measuring contact 124 is integrally conical, the tip of the measuring contact 124 is disposed opposite to the rack 122, the two measuring contacts 124 are both mounted on the rack 122, and the two measuring contacts 124 are respectively located on two opposite sides of the rack 122 along the first direction.

In this way, the rack 122 abuts on the inner wall of the center water chamber pump body in point contact via the measuring contact 124. FIG. 16 shows a schematic diagram of a top view of a gear gland in an embodiment of the present invention.

Referring to fig. 16, in some embodiments, the moving mechanism 120 further includes a gear cover 125. Referring to fig. 4 to 6, the gear cover 125 is a plate-shaped structure having a cylindrical shape, and an axis of the gear cover 125 extends in the third direction, the gear cover 125 is installed in the stepped hole 1113 and located on a side away from the rotor shaft 250, and an upper end surface of the gear cover 125 is flush with an upper surface of the fixture 111. The gear cover 125 has a second through hole 1251 along the third direction, the second through hole 1251 and the center line of the gear cover 125 are overlapped, and the operating handle 123 sequentially extends into the second through hole 1251 and the installation through hole 1211 formed in the gear 121.

In this way, the gear cover 125 can prevent foreign matters such as dust from falling onto the gear 121 through the stepped hole 1113, thereby affecting the rotation of the gear 121.

In one embodiment, the stepped hole 1113 is formed with two stepped surfaces, and the diameter of the stepped hole 1113 increases from the side close to the rotor shaft 250 to the side far from the rotor shaft 250, the gear 121 is mounted on the stepped surface of the side close to the rotor shaft 250, and the gear cover 125 is mounted on the stepped surface of the side far from the rotor shaft 250.

In this way, the stepped surface on the side close to the rotor shaft 250 formed by the stepped hole 1113 supports the gear 121, and the gear 121 can be prevented from falling off the jig 111.

With continued reference to fig. 3 and 5, the detecting device 130 is mounted on the side of the mounting base 110 away from the rotor shaft 250 for measuring the wear amount of the balance disc 210. Preferably, the detection device 130 is a laser displacement sensor. Therefore, the detection device 130 adopts non-contact measurement, and has high measurement precision and good repeatability.

Fig. 17 shows a flow chart of the measurement method of the present invention.

Referring to fig. 17, according to another aspect of the present application, there is provided a measuring method for measuring a wear amount of a balance disc 210 using the measuring apparatus 100 described above; the second measuring reference plane 242 is closer to the balance disk 210 than the first measuring reference plane 241; the measuring method comprises the following measuring steps:

s110, mounting the mounting seat 110 on the rotor shaft 250;

specifically, the entire measuring apparatus 100 is mounted to the rotor shaft 250 by mounting the jig 111, the first clamp 112, and the second clamp to the rotor shaft 250, and fastening the measuring apparatus 100 by the preload screw 115.

S120, driving the moving mechanism 120 to move along 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 through the detection device 130; and/or, the moving mechanism 120 is driven to move along the second direction until the moving mechanism 120 abuts against the second measuring reference surface 242, and the distance between the detecting device 130 and the second measuring reference surface 242 is measured by the detecting device 130.

Specifically, taking fig. 1 as an example, a direction in which the rack 122 approaches the balance board 210 in the first direction is defined as a right side, and a direction in which the rack 122 moves away from the balance board 210 in the first direction is defined as a left side. Rotating the operating handle 123 clockwise, driving the gear 121 to rotate to drive the rack 122 to move left along the first direction, the measuring contact 124 on the left side of the rack 122 abuts against the first measuring reference surface 241, at this time, the rack 122 keeps a static state, the first measuring reference surface 241 causes the gear 121 to rotate along the rack 122 through a reaction, the gear 121 drives the fixture 111 to move right along the first direction, the fixture 111 drives the rotor shaft 250 to move right along the first direction, the rotor shaft 250 drives the balance disk 210 to move right along the first direction until the balance disk 210 contacts the balance disk cover 220, at this time, the detecting device 130 emits laser and receives laser reflected by the second measuring reference surface 242 to obtain a distance between the detecting device 130 and the second measuring reference surface 242, where the distance is the distance X1, and thus a first abrasion loss is obtained by subtracting X from X1.

S130, if the first abrasion loss is larger than a first preset value, replacing the balance disc 210;

specifically, the first preset value is an upper limit value of the wear amount on the right side of the balance disc 210, which is given according to the actual operation requirement of the balance disc 210, and if the wear amount on the right side of the balance disc 210 exceeds the first preset value, the normal operation of the centrifugal pump 200 is affected, and the balance disc 210 needs to be replaced in time.

Fig. 18 shows another flow chart of the measurement method of the present invention.

Referring to fig. 18, S140, if the first wear loss is not greater than the first preset value, the moving mechanism 120 is driven to move along 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 detecting device 130 and the second measurement reference surface 242 is measured by the detecting device 130 to determine a second wear loss of the balance disc 210;

specifically, taking fig. 2 as an example, a direction in which the rack 122 approaches the balance disk 210 in the first direction is defined as a right side, and a direction in which the rack 122 moves away from the balance disk 210 in the first direction is defined as a left side. Rotating the operating handle 123 counterclockwise, the driving gear 121 rotates to drive the rack 122 to move rightward along the first direction, the measuring contact 124 on the right side of the rack 122 abuts against the second measuring reference surface 242, at this time, the rack 122 remains in a stationary state, the second measuring reference surface 242 causes the gear 121 to rotate along the rack 122 through a reaction, the gear 121 drives the fixture 111 to move leftward along the first direction, the fixture 111 drives the rotor shaft 250 to move leftward along the first direction, the rotor shaft 250 drives the balance disk 210 to move leftward along the first direction until the balance disk 210 contacts the thrust ring 230, at this time, the detecting device 130 emits laser light and receives laser light reflected by the second measuring reference surface 242 to obtain a distance between the detecting device 130 and the second measuring reference surface 242, where the distance is the distance Y1 described above, so as to obtain a second wear amount, where the second wear amount is a difference obtained by subtracting Y from Y1.

S150, if the second abrasion loss is larger than a second preset value, replacing the balance disc 210;

specifically, the second preset value is an upper limit value of the wear amount on the left side of the balance disc 210, which is given according to the actual operation requirement of the balance disc 210, and if the wear amount on the left side of the balance disc 210 exceeds the second preset value, the normal operation of the centrifugal pump 200 is affected, and the balance disc 210 needs to be replaced in time.

It should be noted that, in order to save time and improve the measurement efficiency, in the measurement process, the steps S120 and S140 may be interchanged, that is, no matter the moving mechanism 120 is first abutted to the first measurement reference surface 241 or the second measurement reference surface 242, as long as the measurement result is that the side of the balance disc 210 is worn and the wear amount exceeds the standard value, it may be determined that the balance disc 210 needs to be replaced, and at this time, it is not necessary to continue to measure whether the other side of the balance disc 210 is worn.

In some embodiments, prior to mounting the measurement apparatus 100 to the rotor shaft 250, further comprising: disassembling the middle water chamber cover plate of the centrifugal pump 200;

specifically, the centrifugal pump 200 is closed, and the middle water chamber cover plate is removed by the disassembling tool, so that the measuring device 100 can be subsequently installed on the rotor shaft 250 to measure the abrasion amount of the balance disk 210.

It should be noted that before the moving mechanism 120 is driven to move in the first horizontal direction, the intermediate water chamber cover plate needs to be removed, the moving mechanism 120 is repeatedly driven to move in the first direction until the moving mechanism 120 abuts on one of the first measurement reference surface 241 and the second measurement reference surface 242, 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 disk 210, if the first wear amount is not greater than the first preset value, the moving mechanism 120 is driven to move in the first direction until the moving mechanism 120 abuts on the other of the first measurement reference surface 241 and the second measurement reference surface 242, 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 disk 210, the first reference wear amount and the second reference wear amount obtained by measurement are used as references for the first wear amount and the second wear amount, after the first reference wear amount and the second wear amount are obtained by measurement, the intermediate water chamber cover plate is installed, the intermediate water chamber cover plate 200 is started, when the intermediate centrifugal pump 200 is operated, the intermediate water chamber cover plate 200 is again used as a reference wear amount, the difference between the first reference wear amount and the actual wear amount of the first reference wear amount of the first wear amount and the second wear amount of the actual wear of the balance disk 210, and the actual wear amount of the balance disk 210, and the actual wear amount of the actual wear of the balance disk, and the actual wear amount of the actual wear of the intermediate water chamber cover plate, and the actual wear of the balance disk.

In the actual operation process of the centrifugal pump 200, when the right side of the balance disc 210 is worn, the first wear amount is smaller than the first reference wear amount, and the wear amount on the right side of the balance disc 210 is obtained by subtracting the first wear amount from the first reference 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 on the left side of the balance disc 210 is obtained by subtracting the second reference wear amount from the second wear amount; when the wear amount of the right side of the balance disk 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 disk 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 disk 210 exceeds the standard, and the balance disk 210 needs to be replaced, and the balance disk cover 220 needs to be replaced at the same time.

In summary, the present application provides a measuring apparatus 100 and a measuring method, wherein the rotor shaft 250 can be installed by detaching the middle water chamber cover plate via the installation seat 110, the detachment is simple, and the time is saved; when the rack 122 moves in the first direction until the left side of the moving mechanism 120 abuts against the first measuring reference surface 241, the reaction force of the first measuring reference surface 241 on the moving mechanism 120 pushes the rotor shaft 250 and the balance disk 210 to move rightward, and finally the balance disk 210 contacts with the balance chamber cover 220, so that the abrasion loss of the right side of the balance disk 210 can be measured by the detection device 130; when the rack 122 moves in the first direction until the right side of the moving mechanism 120 abuts against the second reference measuring surface 242, the reaction force of the second reference measuring surface 242 against the moving mechanism 120 pushes the rotor shaft 250 and the balance disk 210 to move to the left, and finally the balance disk 210 and the thrust ring 230 contact each other, so that the detecting device 130 can detect the wear amount of the left side of the balance disk 210. In this way, the reaction force of the middle 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, and the distance between the detection device 130 and the second measurement reference surface 242 is measured by the detection device 130, and the distance can be equivalent to the wear amount of the balance disc 210, and the detection device 130 is a contactless measurement distance, which has high accuracy.

All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A measuring device is used for measuring the abrasion loss of a balance disc of a centrifugal pump, the centrifugal pump comprises a rotor shaft, a middle water chamber pump body and the balance disc, the rotor shaft is arranged in the middle water chamber pump body, and the balance disc is sleeved on the rotor shaft and is positioned in the middle water chamber pump body; the water pump is characterized in that a first measuring reference surface and a second measuring reference surface are respectively formed on two opposite inner side surfaces of the middle water chamber pump body along a first direction, and the first direction is the axial direction of the rotor shaft; the measuring device includes:

a mounting seat for removably mounting a standard location on a rotor shaft of the centrifugal pump;

a moving mechanism mounted to the mount, the moving mechanism being capable of reciprocating in the first direction; and

and a detection device mounted on the mounting base, the detection device being configured to measure a distance to the second measurement reference surface when the moving mechanism abuts against the first measurement reference surface and/or the second measurement reference surface, respectively.

2. A measuring device as claimed in claim 1, wherein the mounting comprises a clamp;

and one end of the fixture is provided with a positioning groove matched with the rotor shaft.

3. The measurement device of claim 2, wherein the mount further comprises a first clamp and a second clamp; the fixture is provided with a first mounting groove and a second mounting groove at intervals along a second direction;

the first clamping piece is inserted into the fixture through the first mounting groove;

the second clamping piece is inserted into the fixture through the second mounting groove;

the first clamping piece and the second clamping piece are provided with a first arc-shaped groove and a second arc-shaped groove on one sides facing each other respectively, and the first arc-shaped groove and the second arc-shaped groove are defined together to form a mounting groove for clamping the rotor shaft;

the first direction and the second direction are perpendicular.

4. The measurement device of claim 2, wherein the mount further comprises a limit plate;

the limiting plate is arc-shaped and is formed on the inner wall of the positioning groove of the fixture, and the limiting plate is used for being accommodated in the limiting groove on the rotor shaft.

5. The measuring device according to claim 2, wherein the fixture is further provided with a first through hole, and the first through hole penetrates through the fixture along the first direction;

the moving mechanism comprises a gear and a rack; the gear is rotatably arranged on the fixture, the axis of the gear extends along a third direction, and the rack is movably inserted into the fixture through the first through hole; the gear is meshed with the rack;

the first direction, the second direction and the third direction are perpendicular to each other.

6. The measurement device of claim 5, wherein the movement mechanism further comprises an operating handle;

one end of the operating handle is arranged on the gear and used for driving the gear to rotate around the central axis of the gear.

7. The measurement device of claim 5, wherein the movement mechanism further comprises two measurement contacts;

the two measuring contacts are arranged on the rack, and the two measuring contacts are respectively positioned on two opposite sides of the rack along the first direction.

8. The measurement device of claim 5, wherein the movement mechanism further comprises a gear gland; the fixture is provided with a stepped hole, the diameter of the stepped hole far away from the rotor shaft is larger than that of the part close to the rotor shaft, the gear is arranged in the stepped hole, and the gear gland is fixedly arranged on the stepped surface of the stepped hole.

9. The measuring device as claimed in claim 3, wherein 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;

the pre-tightening screw extends into the third through hole to be installed on the second clamping piece, and one end of the pre-tightening screw abuts against one side, facing the second clamping piece, of the first clamping piece, so that the second clamping piece is driven to move towards the first clamping piece.

10. A measuring method, characterized in that the measuring apparatus according to any one of claims 1 to 9 is used, the measuring method comprising the following measuring steps:

mounting the mount to the rotor shaft;

driving the moving mechanism to move along the first direction until the moving mechanism abuts against the first measuring reference surface, and measuring the distance between the detection device and the second measuring reference surface through the detection device; and/or driving the moving mechanism to move along the second direction until the moving mechanism abuts against the second measuring reference surface, and measuring the distance between the detection device and the second measuring reference surface through the detection device.

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