Main pump motor thrust clearance detection system and detection device thereof

Abstract

The utility model relates to a main pump motor thrust clearance detection system and a detection device thereof. The main pump motor thrust clearance detection device comprises a support; the pushing mechanism is installed on the support and can move in the preset direction of the support, and the pushing mechanism is used for being connected with an output shaft of the main pump motor and driving the output shaft of the main pump motor to move in the preset direction; the power mechanism is mounted on the support and used for driving the pushing mechanism to move; and the displacement detection mechanism is mounted on the support and is used for detecting the displacement of the output shaft of the main pump motor under the pushing of the pushing mechanism. The main pump motor thrust clearance detection device can calculate the thrust clearance of the main pump motor, and has the advantages of automation, precision, intelligence and portability, so that the risk of personnel measurement can be reduced, and the measurement precision can be improved.

Description

Technical Field

[0001] The utility model relates to the field of nuclear power, in particular to a main pump motor thrust clearance detection system and a detection device thereof. Background Art

[0002] At present, the thrust clearance detection of the main pump motor usually adopts traditional processes, such as meter stands and dial indicators, manual meter reading, etc., and calculates whether the clearance meets the requirements. During the measurement process, personnel face a greater industrial risk of high-pressure medium leakage, and there are also risks such as calculation errors. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide an improved main pump motor thrust clearance detection system and a detection device thereof.

[0004] The technical solution adopted by the utility model to solve the technical problem is: a main pump motor thrust clearance detection device, comprising:

[0005] Support;

[0006] A pushing mechanism is installed on the support and is movably arranged relative to the support along a preset direction, and the pushing mechanism is used to connect to the output shaft of the main pump motor and drive the output shaft of the main pump motor to move in the preset direction;

[0007] A power mechanism, mounted on the support and used to drive the pushing mechanism to move;

[0008] The displacement detection mechanism is installed on the support and is used to detect the displacement of the output shaft of the main pump motor under the push of the pushing mechanism.

[0009] In some embodiments, the pushing mechanism includes a base mounted on the support, and a pushing head arranged on the base, and the base and the pushing head are matched with each other in a concave-convex manner; a connecting piece is provided on the pushing head, and the connecting piece protrudes toward an end of the pushing head away from the base to connect to the output shaft of the main pump motor.

[0010] In some embodiments, a groove is provided on the end surface where the base and the push head are connected; and a convex portion that cooperates with the groove is formed at one end where the push head and the base are connected.

[0011] In some embodiments, the support is annular;

[0012] The main pump motor thrust clearance detection device also includes a bearing; the bearing includes a bearing seat and a rolling element,

[0013] The bearing seat is at least partially mounted in the ring of the support and is coaxially arranged with the support;

[0014] The rolling element is coaxially arranged in the bearing seat and is rollingly connected with the bearing seat;

[0015] The pushing mechanism is partially inserted into the rolling body and is coaxially arranged with the bearing seat.

[0016] In some embodiments, the power mechanism includes a hydraulic drive mechanism;

[0017] A cavity is formed in the bearing seat, and the cavity is formed at one end of the bearing seat close to the pushing mechanism and is connected to the hydraulic drive mechanism.

[0018] In some embodiments, the main pump motor thrust clearance detection device also includes a ground displacement detection device, and the ground displacement detection device is installed on the bearing.

[0019] In some embodiments, the support includes a first end surface and a second end surface, and the first end surface is disposed opposite to the second end surface;

[0020] The pushing mechanism is arranged to protrude from the first end surface;

[0021] A connecting arm is arranged on the first end surface, and the connecting arm extends outward; the displacement detection mechanism is installed on the connecting arm.

[0022] In some embodiments, there are at least two displacement detection mechanisms, and at least two displacement detection mechanisms are arranged at intervals along the circumference of the support.

[0023] In some embodiments, the displacement detection mechanism includes a laser displacement sensor.

[0024] The utility model also constructs a main pump motor thrust gap detection system, including the main pump motor thrust gap detection device, a control unit, and a power output unit described in the utility model; the power output unit is connected to the power mechanism in the main pump motor thrust gap detection device, and the control unit is connected to the displacement detection mechanism in the main pump motor thrust gap detection device and the power output unit.

[0025] The implementation of the main pump motor thrust gap detection system and detection device of the utility model has the following beneficial effects: the main pump motor thrust gap detection device installs a pushing mechanism, a power mechanism connected to the pushing mechanism, and a displacement detection mechanism on a support, and then the power mechanism can drive the pushing mechanism to push the output shaft of the main pump motor connected to it to move in a preset direction, and the displacement detection mechanism detects the displacement of the output shaft of the main pump motor driven by the pushing mechanism, thereby calculating the thrust gap of the main pump motor. It has the advantages of automation, precision, intelligence, and portability, and can reduce the risk of personnel measurement and improve measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0027] Figure 1 It is a structural schematic diagram of a main pump motor thrust clearance detection device in some embodiments of the utility model;

[0028] Figure 2 yes Figure 1 A cross-sectional view of the thrust clearance detection device of the main pump motor shown;

[0029] Figure 3 yes Figure 1 The schematic diagram of the assembly of the support and displacement detection mechanism of the thrust clearance detection device of the main pump motor is shown;

[0030] Figure 4 yes Figure 3 The schematic diagram of the support structure of the thrust clearance detection device of the main pump motor is shown;

[0031] Figure 5 yes Figure 2 The schematic diagram of the bearing structure of the thrust clearance detection device of the main pump motor is shown;

[0032] Figure 6 yes Figure 5 A cross-sectional view of the thrust clearance detection device of the main pump motor shown;

[0033] Figure 7 yes Figure 2 The schematic diagram of the exploded structure of the push mechanism of the thrust clearance detection device of the main pump motor is shown;

[0034] Figure 8 yes Figure 6 A cross-sectional view of the base in the push mechanism shown. DETAILED DESCRIPTION

[0035] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "upper", "lower", "inner", "outer", etc. are based on the directions or positional relationships shown in the accompanying drawings, are constructed and operated in specific directions, and are only for the convenience of describing the present technical solution, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0036] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "installation", "connection", "setting" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intermediate elements. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third", etc. can explicitly or implicitly include one or more of the features. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0037] In the following description, specific details such as specific system structures and technologies are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details that hinder the description of the present invention.

[0038] Figure 1 and Figure 2 Some preferred embodiments of the main pump motor thrust clearance detection system of the utility model are shown. The main pump motor thrust clearance detection system can be used for the maintenance of the main pump motor, and can automatically measure the thrust clearance of the main pump motor, solving the problem of online measurement of the thrust clearance of the main pump motor. The main pump motor thrust clearance detection system has the advantages of automation, precision, intelligence, and portability, thereby reducing the risk of personnel measurement and improving measurement accuracy.

[0039] It should be noted that the thrust bearing in the main pump motor is a bidirectional thrust bearing. The axial thrust of each thrust bearing is borne by the upper and lower thrust pads, so that the thrust load is evenly distributed on each pad. The thrust head is located between the upper and lower thrust pads. Once the thrust head contacts one of the upper and lower thrust pads, a certain gap will be generated with the other thrust pad. If the gap is too small, the friction loss between the thrust pad and the thrust plate will increase, causing the temperature of the thrust pad to rise and the thrust pad to wear easily. If the thrust gap is too large, when the thrust changes suddenly, it will cause excessive impact on the thrust pad, causing the gap between the moving and static parts to change too much, causing axial friction and collision. Therefore, when the main pump motor is completely disassembled during unit maintenance, the gap must be measured.

[0040] In some embodiments, the main pump motor thrust gap detection system may include a first bracket, a second bracket, a main pump motor thrust gap detection device, a control unit, and a power output unit. The main pump motor gap detection device may be installed on the first bracket. The second bracket is arranged on one side of the first bracket. The first bracket and the second bracket may be tripods. In some embodiments, the first bracket may be a columnar structure. An adjustment device for adjusting the horizontality of the plane of the main pump motor thrust gap detection device may be arranged on the first bracket, and the adjustment device may include a small motor. The main pump motor thrust gap detection device may be connected to the main pump motor and may detect its thrust gap. The control unit is connected to the main pump motor thrust gap detection device, and is used to receive information fed back by the main pump motor thrust gap detection device, and process the information to obtain the main pump motor thrust gap. The control unit may be a conventional computer device. The power output unit may be connected to the main pump motor thrust gap detection device, and is used to output power to the main pump motor. The power output unit may be connected to the control unit, and may output or stop outputting power to the main pump motor thrust gap detection device by receiving instructions from the control unit. The power output unit may be a hydraulic pump station.

[0041] In some embodiments, the thrust clearance detection device of the main pump motor may include a support 10, a bearing 20, a driving mechanism 30, a power mechanism 40, and a displacement detection mechanism 50. The support 10 can be used to install the bearing 20, the power mechanism 40, and the displacement detection mechanism 50. The bearing 20 is installed on the support 10 and can be installed on the driving mechanism 30. The driving mechanism 30 is installed on the support 10 by installing the bearing 20. The driving mechanism 30 is movably arranged along a preset direction relative to the support 10. The driving mechanism 30 is used to connect with the output shaft of the main pump motor and can drive the output shaft of the main pump motor to move in a preset direction. The preset direction can be the axial direction of the bearing 20. The power mechanism 40 is installed on the support 10, and a power source can be injected into the driving mechanism 30 to drive the driving mechanism 30 to move. The displacement detection mechanism 50 is installed on the support 10 and can be used to detect the displacement of the output shaft of the main pump motor under the drive of the driving mechanism 30. The power mechanism 40 drives the pushing mechanism 30 to push the output shaft of the main pump motor connected thereto to move in a preset direction, and the displacement of the output shaft of the main pump motor driven by the pushing mechanism 30 is detected by the displacement detection mechanism 50, so that the thrust clearance of the main pump motor can be calculated. It has the advantages of automation, precision, intelligence and portability, which can reduce the risk of personnel measurement and improve measurement accuracy.

[0042] like Figure 3 and Figure 4As shown, further, in some embodiments, the support 10 may be annular, specifically, the support 10 may include a first annular body 11, and a second annular body 12 disposed inside the first annular body 11 and connected to the first annular body 11. The first annular body 11 and the second annular body 12 may both be annular, and the two are coaxially arranged. The axial height of the second annular body 12 is less than the axial height of the first annular body 11, that is, the second annular body 12 may be arranged in a stepped manner with the first annular body 11. The second annular body 12 may be used for the installation limit of the bearing 20.

[0043] In some embodiments, the support 10 further includes a first end face 10a and a second end face 10b, and the first end face 10a and the second end face 10b may be located at two ends of the first annular body 11 in the axial direction, and the two are arranged opposite to each other. In some embodiments, a plurality of first through holes 111 are provided on the first annular body 11, and the plurality of first through holes 111 may be arranged at intervals along the circumference of the first annular body 11, and may be used to install a connecting arm 13, and the connecting arm 13 may be located on the first end face 10a, and may extend radially outwardly along the first annular body 11, and may be connected to the first through hole 111 by providing a first connecting structure 14. The connecting arm 13 may be used for the displacement detection mechanism 50 to be installed thereon. There may be multiple connecting arms 13, and specifically, in some embodiments, there may be four connecting arms 13, and the four connecting arms 13 may be arranged equidistantly along the circumference of the first annular body 11. A sleeve 131 with two ends passing through may be provided at one end of the connecting arm 13 , and the first connecting structure 14 is passed through the sleeve 131 of the connecting arm 13 and is screwed to the first through hole 111 .

[0044] In some embodiments, a plurality of second through holes 121 may be provided on the second annular body 12 . The plurality of second through holes 121 may be arranged at intervals along the circumference of the second annular body 12 , and are used to be connected to the bearing 20 by providing a second connection structure.

[0045] like Figure 5 and Figure 6 As shown, in some embodiments, the bearing 20 may include a bearing seat 21 and a rolling element 22. The bearing seat 21 may be at least partially installed in the ring of the support 10 and coaxially arranged with the support 10. The rolling element 22 is a hollow structure and may be coaxially arranged in the bearing seat 21 and rollingly connected with the bearing seat 21.

[0046] In some embodiments, the bearing seat 21 is a hollow structure with two ends through, and may include a coaxially spliced ​​lower seat 211 and an upper seat 212. The lower seat 211 may be partially installed in the central through hole of the second annular body 12, and may overlap with the second annular body 12. In some embodiments, the lower seat 211 may include a first columnar body 2111 and a second columnar body 2112, the first columnar body 2111 may be inserted into the central through hole of the second annular body 12, the second columnar body 2112 is connected to the first columnar body 2111, and its radial dimension may be greater than the radial dimension of the first columnar body 2111, and it may be mounted on the first annular body 12. The upper seat 212 may be installed on the second columnar body 2112, and may protrude from the first end surface 10a. In some embodiments, the upper seat 212 may include a third column 2121 and a fourth column 2122. The third column 2121 may be installed in the first annular body 11. The radial dimension of the fourth column 2122 is smaller than the radial dimension of the third column 2121, and may protrude from the first end face 10a, and may limit the rolling body 22. A plurality of bolt holes 2123 are provided on the end face of the fourth column 2122 of the upper seat 212. The bolt holes 2123 may be multiple and may be arranged at intervals along the circumference of the upper seat 212, and may be used for installing countersunk screws.

[0047] like Figure 7 and Figure 8 As shown, in some embodiments, the pushing mechanism 30 can be inserted into the rolling body 22, and can pass through the upper seat body 212, and can be protruded from the first end surface 10a. In some embodiments, the pushing mechanism 30 may include a base 31, a push head 32, and a connecting member 33. The base 31 can be partially installed in the rolling body 22 of the bearing 20, and the push head 32 can be arranged on the base 31 and coaxially arranged with the base 31, and the two can be concave and convex. The connecting member 34 is arranged on the push head 32 and protrudes toward one end of the push head 32 away from the base 31, which can be used to connect with the output shaft of the main pump motor.

[0048] In some embodiments, the base 31 may include a plug-in portion 312 and a bearing portion 311 disposed on the plug-in portion 312 and bearing the push head 32. The plug-in portion 312 may be cylindrical and may be inserted into the central through hole of the rolling element 22 of the bearing 20. The bearing portion 311 may be cylindrical and may have a radial dimension greater than that of the plug-in portion 312. The bearing portion 311 may be mounted on the rolling element 22 and may pass through an end of the upper seat 212 away from the lower seat 211. In some embodiments, a groove 3111 may be provided on the end surface of the base 31 where the push head 32 is connected. The groove 3111 may be formed on the end surface of the bearing portion 311 away from the plug-in portion 312 and may be used for assembly with the push head 32. A section of the plug-in portion 312 away from the bearing portion 311 is provided with an annular mounting groove 3121, and the mounting groove 3121 may be used for mounting a retaining ring.

[0049] In some embodiments, the push head 32 may be columnar, and a mounting through hole 321 is provided thereon. The mounting through hole 321 runs through both ends of the push head 32, and is used for mounting with the mounting through hole 321. In some embodiments, a limiting step 3211 for limiting the connection member 33 may be provided inside the mounting through hole 321. In some embodiments, a convex portion 322 may be formed at one end of the push head 32 connected to the base 31, and the convex portion 322 may be provided corresponding to the groove 3111, and may be embedded in the groove 3111 and cooperate with the groove 3111. In some embodiments, the convex portion 322 may be a spherical surface.

[0050] In some embodiments, the connecting member 33 can be a screw or a coupling. The connecting member 33 can include a limiting portion 331 and a connecting portion 332. The limiting portion 331 can cooperate with the limiting step 3211 for limiting. The connecting portion 332 can pass through the mounting through hole 321 and be connected to the output shaft of the main pump motor. In some embodiments, it can be threadedly connected to the output shaft of the main pump motor.

[0051] For example Figure 1 and Figure 2 As shown, in some embodiments, the power mechanism 40 can be a hydraulic drive mechanism, such as a hydraulic cylinder, which can be installed on the side of the lower seat body 211 away from the upper seat body 212. A cavity 210 can be formed inside the bearing seat 21, and the cavity 210 is formed at the central axis of the lower seat body 211, which can be connected with the hydraulic drive mechanism, and the cylinder plunger of the hydraulic drive mechanism is embedded in the cavity 210, so that it can move under the action of hydraulic power and drive the pushing mechanism 30 to move along the axial direction of the support 10. In some embodiments, the depth of the cavity 210 can be 2mm, so that the range of movement of the output shaft of the main pump motor is between 2mm. The power mechanism 40 can be connected to the power output unit, and the power output unit can output hydraulic oil to the power mechanism 40. The power mechanism 40 can be connected to the second through hole 121 of the support 10 through a second connecting structure, and the second connecting structure can be a countersunk screw. The power mechanism 40 can be provided with a threaded hole corresponding to the second through hole 121.

[0052] In some embodiments, there may be at least two displacement detection mechanisms 50, and the at least two displacement detection mechanisms 50 may be arranged at intervals along the circumference of the support 10, and may be installed one-to-one on one side of the connecting arm 13, which may be arranged toward the main pump motor. Through at least two displacement detection mechanisms 50, the displacement of the output shaft of the main pump motor under the push of the pushing mechanism may be detected in different orientations, thereby improving the detection accuracy. In some embodiments, there may be four displacement detection mechanisms 50, and the angle between two adjacent displacement detection mechanisms 50 may be 90 degrees. The displacement detection mechanism 50 may be a laser displacement sensor, which may emit a laser toward the main pump motor and thereby obtain the axial movement distance of the output shaft of the main pump motor. In some embodiments, the displacement detection mechanism 50 may be connected to a control unit, which may feed back the detected information to the control unit.

[0053] In some embodiments, the main pump motor thrust clearance detection device may further include a ground displacement detection device 60, which is mounted on the bearing 20. Specifically, the ground displacement detection device 60 can be inserted from the bearing seat 21 to the support 10, and it can be set toward the second bracket, and can be used to measure the deformation of the main pump motor thrust clearance detection device, thereby improving the accuracy of the main pump motor thrust clearance detection. In some embodiments, the bearing seat 21 may be provided with an avoidance groove 2123, and the avoidance groove 2123 can be used for the ground displacement detection device 60 to be inserted into the support 10, and can extend from one of the first through holes 111 of the support 10. In some embodiments, the ground displacement detection device 60 can be a grating ruler, which can be connected to the control unit, and the detection information can be fed back to the control unit.

[0054] The thrust clearance detection system of the main pump motor of the present application specifically detects the thrust clearance of the main pump motor as follows: the thrust clearance detection device of the main pump motor is installed on the first bracket, the horizontality of the thrust clearance detection device of the main pump motor is adjusted, and the direction of the displacement detection device of the main pump motor thrust clearance detection device is adjusted, the output shaft of the main pump motor is connected to the connecting piece 33 of the thrust clearance detection device of the main pump motor, and the direction of the displacement detection mechanism of the thrust clearance detection device of the main pump motor is adjusted so that it faces the main pump motor. The hydraulic pump station is started by operating the control unit, and hydraulic oil is injected into the power mechanism 40. The power mechanism 40 drives the pushing mechanism 30 to move axially away from the support 10, and the output shaft of the main pump motor moves to the set position, and the injection of hydraulic oil into the power mechanism 40 is stopped. The displacement of the output shaft of the main pump motor is detected by the displacement detection mechanism and fed back to the control unit, and the detection information of the ground displacement detection device is also fed back to the control unit, and the control unit processes the information to obtain the thrust clearance of the main pump motor.

[0055] The main pump motor thrust clearance detection system of the present application utilizes a laser displacement sensor, a grating ruler, and multi-angle and multi-directional measurements. Through the integration of a data processing unit, the absolute value of the main pump motor thrust clearance is obtained, thus solving the problem of online measurement of the main pump motor thrust clearance.

[0056] It can be understood that the above embodiments only express the preferred implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the utility model. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the utility model, the above-mentioned technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the utility model. Therefore, all equivalent changes and modifications made to the scope of the claims of the utility model should belong to the scope covered by the claims of the utility model.

Claims

1. A main pump motor thrust clearance detection device, characterized in that: include: Support (10); A pushing mechanism (30) is mounted on the support (10) and is movably arranged relative to the support (10) along a preset direction, wherein the pushing mechanism (30) is used to connect to the output shaft of the main pump motor and drive the output shaft of the main pump motor to move in the preset direction; A power mechanism (40) is installed on the support (10) and is used to drive the pushing mechanism (30) to move; The displacement detection mechanism (50) is mounted on the support (10) and is used to detect the displacement of the output shaft of the main pump motor when driven by the driving mechanism (30).

2. The main pump motor thrust clearance detection device according to claim 1, characterized in that: The pushing mechanism (30) comprises a base (31) mounted on the support (10), and a pushing head (32) arranged on the base (31), wherein the base (31) and the pushing head (32) are matched with each other in a concave-convex manner; a connecting member (33) is arranged on the pushing head (32), and the connecting member (33) protrudes toward one end of the pushing head (32) away from the base (31) so as to be connected to the output shaft of the main pump motor.

3. The main pump motor thrust clearance detection device according to claim 2, characterized in that: The end surface where the base (31) and the push head (32) meet is provided with a groove (3111); and the end where the push head (32) and the base (31) meet is formed with a convex portion (322) that matches the groove (3111).

4. The main pump motor thrust clearance detection device according to claim 1, characterized in that: The support (10) is annular; The main pump motor thrust clearance detection device further comprises a bearing (20); the bearing (20) comprises a bearing seat (21) and a rolling element (22). The bearing seat (21) is at least partially installed in the ring of the support (10) and is coaxially arranged with the support (10); The rolling body (22) is coaxially arranged in the bearing seat (21) and is rollingly connected to the bearing seat (21); The pushing mechanism (30) is partially inserted into the rolling body (22) and is coaxially arranged with the bearing seat (21).

5. The main pump motor thrust clearance detection device according to claim 4, characterized in that: The power mechanism (40) comprises a hydraulic drive mechanism; A cavity is formed in the bearing seat (21), the cavity is formed at one end of the bearing seat (21) close to the pushing mechanism (30), and is connected to the hydraulic drive mechanism.

6. The main pump motor thrust clearance detection device according to claim 4, characterized in that: The main pump motor thrust clearance detection device further comprises a ground displacement detection device (60), and the ground displacement detection device (60) is mounted on the bearing (20).

7. The main pump motor thrust clearance detection device according to claim 1, characterized in that: The support (10) comprises a first end surface (10a) and a second end surface (10b), wherein the first end surface (10a) and the second end surface (10b) are arranged opposite to each other; The pushing mechanism (30) is arranged to protrude from the first end surface (10a); A connecting arm (13) is provided on the first end surface (10a), and the connecting arm (13) extends outward; the displacement detection mechanism (50) is installed on the connecting arm (13).

8. The main pump motor thrust clearance detection device according to claim 1, characterized in that: There are at least two displacement detection mechanisms (50), and the at least two displacement detection mechanisms (50) are arranged at intervals along the circumference of the support (10).

9. The main pump motor thrust clearance detection device according to claim 1, characterized in that: The displacement detection mechanism (50) comprises a laser displacement sensor.

10. A main pump motor thrust clearance detection system, characterized in that: It comprises a main pump motor thrust gap detection device, a control unit, and a power output unit as described in any one of claims 1 to 9; the power output unit is connected to a power mechanism (40) in the main pump motor thrust gap detection device, and the control unit is connected to a displacement detection mechanism (50) in the main pump motor thrust gap detection device and the power output unit.

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