Submersible motor protector and submersible screw pump

Abstract

The present application relates to a submersible motor protector and a submersible screw pump, comprising a housing, a rotating shaft, a first and a second brake member, a locking assembly and a brake driving member, wherein the rotating shaft is rotatably arranged in the housing; the first brake member is arranged in the housing and fixed to the rotating shaft; the second brake member is movably arranged in the housing and circumferentially fixed to the housing; the locking assembly is arranged in the housing, connected to the first brake member and detachably connected to the second brake member; the brake driving member is connected to the second brake member; in a first state, the first brake member is separated from the second brake member, the rotating shaft can drive the first brake member to rotate, and the locking assembly is connected to the second brake member to axially limit the second brake member; in a second state, the rotating shaft is subjected to a thrust toward the second brake member, the rotating shaft can drive the first brake member to move toward the second brake member, the first brake member can drive the locking assembly to separate from the second brake member, and the brake driving member can drive the second brake member to move in the direction of the first brake member, so that the second brake member is connected to the first brake member.

Description

Technical Field

[0001] The present application relates to the field of submersible unit equipment, and in particular to a submersible motor protector and a submersible screw pump. Background Art

[0002] At present, when the submersible screw pump unit is in operation, the role of the shaft is to bear the axial force generated during the operation and lifting of the screw pump, and prevent the axial force from continuing to be transmitted to the motor. If the shaft is overloaded, it will cause the shaft to move downward, and transmit the axial force generated by the screw pump to the motor. The motor itself cannot withstand the axial force, and the motor will be damaged quickly when it is running while bearing the axial force, resulting in huge losses.

[0003] The existing submersible screw pump unit has no feedback device, and the motor shutdown is generally a direct braking method of the motor. Summary of the invention

[0004] The embodiments of the present application are intended to provide a submersible motor protector and a submersible screw pump to solve the problem of mechanical control shutdown after the shaft is overloaded.

[0005] In order to solve the above technical problems, a technical solution adopted in the present application is: to provide a submersible motor protector, including a housing, a rotating shaft, a first brake member, a second brake member, a locking assembly and a brake driving member, wherein the rotating shaft is rotatably arranged in the housing; the first brake member is arranged in the housing and fixed to the rotating shaft; the second brake member is movably arranged in the housing, the second brake member is circumferentially fixed to the housing, and the second brake member is arranged on one side of the first brake member along the axial direction of the rotating shaft; the locking assembly is arranged in the housing, the locking assembly is connected to the first brake member, and the locking assembly is detachably connected to the second brake member; the brake driving member is connected to the second Braking member; in a first state, the locking assembly is connected to the second brake member to limit the axial position of the second brake member, the first brake member is separated from the second brake member, and the rotating shaft can drive the first brake member to rotate relative to the housing; in a second state, the rotating shaft is subjected to a thrust toward the second brake member, the rotating shaft can drive the first brake member to move toward the direction of the second brake member, the first brake member can drive the locking assembly to separate from the second brake member, and the brake driving member can drive the second brake member to move toward the direction of the first brake member, so that the second brake member is connected to the first brake member to limit the circumferential position of the first brake member.

[0006] In one or more / any one of the above optional embodiments, the locking assembly includes a push rod, a slider and a first elastic member, the push rod is movably arranged in the outer shell, and the slider is movably connected to the outer shell; along the axial direction of the rotating shaft, one end of the push rod is slidably connected to the slider, and the other end of the push rod is connected to the first brake member; along the radial direction of the rotating shaft, one end of the slider is connected to the first elastic member, and the other end of the slider is detachably connected to the second brake member; in the first state, the first elastic member can apply an elastic force to the slider in the direction of the second brake member, so that the slider is connected to the second brake member; in the second state, the first brake member can drive the push rod to move in the direction of the second brake member, and the push rod can drive the slider to move in the direction away from the second brake member, so that the slider is separated from the second brake member.

[0007] In one or more / any one of the above optional embodiments, the slider is provided with an inclined surface, which is inclined to the axial direction of the rotating shaft; one end of the push rod can be slidably abutted against the inclined surface, and the push rod can move relative to the outer shell along the axial direction of the rotating shaft, driving the slider to move relative to the outer shell along the radial direction of the rotating shaft, so that the slider is connected or separated from the second brake member.

[0008] In one or more / any one of the above optional embodiments, a limiting groove is provided on the circumference of the second brake member, and one end of the slider can be clamped in the limiting groove to axially fix the second brake member to the outer shell; and / or the outer shell is provided with a slider hole, which extends from the inner wall of the outer shell toward the outer wall of the outer shell, and the slider is at least partially accommodated in the slider hole, and the slider can move in the slider hole.

[0009] In one or more / any one of the above optional embodiments, the submersible motor protector includes a thrust bearing, which is movably arranged in the outer shell, the thrust bearing is arranged around the rotating shaft, and the thrust bearing is arranged between the first brake member and the locking assembly; the moving ring of the thrust bearing is connected to the first brake member, and the stationary ring of the thrust bearing is connected to the push rod, the first brake member can drive the thrust bearing to move toward the direction of the second brake member, and the first brake member can drive the moving ring of the thrust bearing to rotate relative to the outer shell.

[0010] In one or more / any one of the above optional embodiments, the submersible motor protector includes a third elastic member, a bearing group and a fourth elastic member; the third elastic member is connected to one end of the thrust bearing facing the locking assembly, and when the second state is reset to the first state, the third elastic member can apply an elastic force to the thrust bearing so that the thrust bearing and the push rod move toward the direction of the first brake member; and / or the submersible motor protector includes a bearing group and a fourth elastic member, the bearing group is movably arranged in the housing, the bearing group is sleeved on the rotating shaft, and the bearing group is arranged on the side of the first brake member away from the second brake member, the fourth elastic member is connected to one end of the bearing group facing the second brake member, and when the second state is reset to the first state, the fourth elastic member can apply an elastic force to the bearing group so that the bearing group and the rotating shaft move in a direction away from the second brake member.

[0011] In one or more / any one of the above optional embodiments, the braking drive member includes a second elastic member, which abuts against one end of the second braking member facing away from the first braking member; in the second state, the second elastic member can drive the second braking member to move in the direction of the first braking member.

[0012] In one or more / any one of the above optional embodiments, the brake drive member also includes a suction device, which is arranged on the side of the second brake member away from the first brake member; when resetting from the second state to the first state, the suction device can apply an adsorption force to the second brake member, so that the second brake member moves in a direction away from the first brake member until the second brake member is connected to the locking assembly.

[0013] In one or more / any one of the above optional embodiments, one of the first brake member and the second brake member is provided with a clamping block, and the other of the first brake member and the second brake member is provided with a clamping groove, and the clamping block can be clamped in the clamping groove to circumferentially limit the first brake member; and / or one of the second brake member and the outer shell is provided with a sliding groove, and the other of the second brake member and the outer shell is provided with a sliding key, and the sliding key is movably arranged in the sliding groove.

[0014] In one or more / any one of the above optional embodiments, a reset component is further included; the reset component is connected to the first brake member and / or the second brake member; when resetting from the second state to the first state, the reset component can drive the first brake member to move in a direction away from the second brake member; and / or the reset component can drive the second brake member to move in a direction away from the first brake member; so that the first brake member and the second brake member are separated.

[0015] In order to solve the above technical problem, another technical solution adopted in the present application is: to provide a submersible screw pump, including the above submersible motor protector.

[0016] The submersible motor protector in the embodiment of the present application, after the rotating shaft is thrust toward the second brake member, the locking assembly, the brake member and the brake drive member cooperate with each other to prevent the rotating shaft from continuing to rotate, and perform a feedback shutdown on the motor to prevent the axial force generated by the continued rotation and lifting of the screw pump from causing damage to other parts of the unit.

[0017] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be exemplified below. Obviously, the drawings described below are only some embodiments of the present application, and these exemplary descriptions do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, and unless otherwise stated, the figures in the drawings do not constitute a scale limitation.

[0019] Figure 1 is a schematic structural diagram of a submersible motor protector according to an embodiment of the present application;

[0020] Figure 2 yes Figure 1 A cross-sectional view of a submersible motor protector is shown;

[0021] Figure 3 yes Figure 2 A schematic diagram of the structure of a first joint of a housing in a submersible motor protector shown;

[0022] Figure 4 yes Figure 2 A schematic diagram of the structure of the second joint of the housing in the submersible motor protector shown;

[0023] Figure 5 yes Figure 3 a cross-sectional view of the first joint shown;

[0024] Figure 6 yes Figure 2 A structural schematic diagram of the first brake member in the submersible motor protector shown in ;

[0025] Figure 7 yes Figure 2 A schematic diagram of the structure of the second brake member in the submersible motor protector shown in ;

[0026] Figure 8 yes Figure 2 A schematic diagram of the structure of a slider in a submersible motor protector shown in ;

[0027] Fig. 9 yes Figure 8 A cross-sectional view of the slider shown;

[0028] Fig.10 yes Figure 2 A partial enlarged view of the submersible motor protector is shown.

[0029] The reference numerals are as follows:

[0030] 10. Shell;

[0031] 110, housing; 110a, first end; 110b, second end;

[0032] 120, first joint; 121, first main body; 122, first latch; 123, first step; 124, bump; 120a, first cavity; 120b, second cavity; 120c, third cavity; 120d, slider hole; 120e, receiving hole;

[0033] 130, second joint; 131, second main body; 132, second latch tongue; 133, second step portion;

[0034] 20. Rotating shaft;

[0035] 30, first brake member; 310, first connecting portion; 320, limiting portion; 30a, slot;

[0036] 40, second brake member; 410, second connecting portion; 420, clamping block; 40a, sliding groove; 40b, limiting groove;

[0037] 50. Locking assembly;

[0038] 510, slider; 511, inclined surface; 520, push rod; 530, first elastic member;

[0039] 60. Brake drive parts;

[0040] 610, second elastic member;

[0041] 620, a pull-in device; 621, an armature; 622, a magnetic attraction member;

[0042] 70, thrust bearing; 710, moving ring; 720, stationary ring; 730, roller;

[0043] 80. Bearing set;

[0044] 90. Reset assembly; 910. Third elastic member; 920. Fourth elastic member. DETAILED DESCRIPTION

[0045] In order to facilitate the understanding of the present application, the present application is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or there can be one or more centered elements therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element, or there can be one or more centered elements therebetween.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0047] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "length", "width", and "thickness" is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the embodiments of the present application.

[0048] In the description of the embodiments of the present application, the use of words such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meanings and therefore cannot be understood as limiting the scope of protection of the present application. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0049] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0050] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0051] In the prior art, there is no feedback device in the submersible screw pump unit, making it difficult to identify whether the unit is overloaded, and the existing motor shutdown is generally a direct motor braking method. During operation, the submersible motor is controlled to rotate and drive the submersible screw pump unit to operate. The axial force generated by the screw pump lifting is transmitted downward, and the axial force is borne by the shaft after reaching the shaft. However, if the shaft is overloaded during operation, it will continue to move downward along the axial direction. To this end, the present application provides a submersible motor protector to solve the mechanical control shutdown after the shaft is overloaded.

[0052] like Figure 1 and Figure 2 As shown, the embodiment of the present application provides a submersible motor protector, including a housing 10, a rotating shaft 20, a first brake member 30, a second brake member 40, a locking assembly 50 and a brake driver 60. The rotating shaft 20 is rotatably disposed in the housing 10, and the rotating shaft 20 can move relative to the housing 10; the first brake member 30 is disposed in the shell 110 of the housing 10 and fixed to the rotating shaft 20; the second brake member 40 is movably disposed in the shell 110 of the housing 10, and the second brake member 40 is circumferentially fixed to the shell 110 of the housing 10, and the second brake member 40 is disposed on one side of the first brake member 30 along the axial direction of the rotating shaft 20; the locking assembly 50 is disposed in the shell 110 of the housing 10, the locking assembly 50 is connected to the first brake member 30, and the locking assembly 50 is detachably connected to the second brake member 40; the brake driver 60 is connected to the second brake member 40.

[0053] In the first state, the locking assembly 50 is connected to the second brake member 40 to limit the axial position of the second brake member 40 , the first brake member 30 is separated from the second brake member 40 , and the rotating shaft 20 can drive the first brake member 30 to rotate relative to the housing 10 .

[0054] In the second state, the rotating shaft 20 is pushed toward the second brake member 40, the rotating shaft 20 can drive the first brake member 30 to move toward the second brake member 40, the first brake member 30 can drive the locking assembly 50 to separate from the second brake member 40, and the brake driving member 60 can drive the second brake member 40 to move toward the first brake member 30, so that the second brake member 40 is connected to the first brake member 30 to circumferentially limit the first brake member 30. It should be noted that the second brake member 40 is connected to the first brake member 30, which means that the second brake member 40 abuts against the first brake member 30 to limit the rotation of the first brake member 30 and the rotating shaft 20.

[0055] In some embodiments, the housing 10 includes the above-mentioned housing 110, a first joint 120 and a second joint 130, and the first joint 120 and the second joint 130 are respectively connected to the two ends of the housing 110. The first joint 120 is connected to the first end 110a of the housing 110, and the second joint 130 is connected to the second end 110b of the housing 110. The first end 110a of the housing 110 and the second end 110b of the housing 110 are arranged opposite to each other along the axis direction of the housing 110. The rotating shaft 20 is sequentially arranged through the first joint 120, the housing 110 and the second joint 130, and the two ends of the rotating shaft 20 are rotatably connected to the first joint 120 and the second joint 130, respectively, and the rotating shaft 20 can rotate relative to the housing 110 around its axis, and the rotating shaft 20 can move relative to the housing 110 along its axis direction. It should be noted that the axis direction of the rotating shaft 20 refers to the extension direction of the rotating shaft 20. The axis direction of the housing 110 is the same as the axis direction of the rotating shaft 20.

[0056] In some embodiments, the first connector 120 and the second connector 130 are respectively detachably connected to the housing 110 , such as by threaded connection, snap connection, pin connection, etc.

[0057] In some embodiments, Figure 3 As shown, the first connector 120 includes a first main body 121 and a first tongue 122, the first tongue 122 is connected to one end of the first connector 120 facing the housing 110, and the first tongue 122 is connected to the housing 110. Specifically, the first tongue 122 is inserted into the housing 110 from the first end 110a of the housing 110, and the first tongue 122 is connected to the inner circumferential wall of the housing 110. In this embodiment, the first tongue 122 is threadedly connected to the housing 110. It can be understood that in some other embodiments, the connection method between the first tongue 122 and the housing 110 can be set according to actual needs, such as welding, snap connection, pin connection, etc., which is not limited here.

[0058] In some embodiments, the outer diameter of the first body portion 121 is greater than the outer diameter of the first latch 122 . A first step portion 123 is formed at the connection between the first latch 122 and the first body portion 121 . The first end 110 a of the housing 110 abuts against the first step portion 123 .

[0059] In some embodiments, Figure 4 As shown, the second connector 130 includes a second main body 131 and a second tongue 132, the second tongue 132 is connected to one end of the second main body 131 facing the housing 110, and the second tongue 132 is connected to the housing 110. Specifically, the second tongue 132 is inserted into the housing 110 from the second end 110b of the housing 110, and the second tongue 132 is connected to the inner circumferential wall of the housing 110. In this embodiment, the second tongue 132 is threadedly connected to the housing 110. It can be understood that in some other embodiments, the connection method between the second tongue 132 and the housing 110 can be set according to actual needs, such as welding, snap connection, pin connection, etc., which is not limited here.

[0060] In some embodiments, the outer diameter of the second body portion 131 is greater than the outer diameter of the second latch 132 , and a second step portion 133 is formed at the connection between the second latch 132 and the second body portion 131 . The second end 110 b of the housing 110 abuts against the second step portion 133 .

[0061] In some embodiments, Figure 5 As shown, the inner wall of the first joint 120 is provided with a protrusion 124 extending along the radial direction thereof, and the protrusion 124 divides the internal space of the first joint 120 into a first cavity 120a, a second cavity 120b and a third cavity 120c along the axial direction of the first joint 120, and the first cavity 120a, the second cavity 120b and the third cavity 120c are sequentially connected along the axial direction of the first joint 120. Among them, the inner diameter of the first cavity 120a is greater than the inner diameter of the second cavity 120b. Among them, the axial direction of the first joint 120 is the same as the axial direction of the rotating shaft 20, and the axial direction of the rotating shaft 20 is perpendicular to the radial direction of the rotating shaft 20.

[0062] In some embodiments, Figure 6 As shown, the first brake member 30 is annular, the first brake member 30 is sleeved outside the rotating shaft 20, and the first brake member 30 is threadedly connected to the rotating shaft 20. It is understood that in some other embodiments, the shape of the first brake member 30 can be set according to actual needs, such as being set to a columnar shape, a block shape, etc., which is not limited here. It is understood that in some other embodiments, the connection method of the first brake member 30 and the rotating shaft 20 can be set according to actual needs, such as being set to welding, snap connection, pin connection, etc., which is not limited here.

[0063] In some embodiments, the first brake member 30 includes a first connection portion 310 and a limiting portion 320, wherein the first connection portion 310 is threadedly connected to the rotating shaft 20, and the limiting portion 320 is connected to one end of the first connection portion 310 close to the second brake member 40, and the limiting portion 320 is used for circumferential limiting when connected to the second brake member 40. The outer diameter of the first connection portion 310 is greater than the outer diameter of the limiting portion 320.

[0064] In some embodiments, part of the second brake member 40 is disposed in the first joint 120 and sleeved on the rotating shaft 20, and the second brake member 40 can move between a first position and a second position relative to the first joint 120. Specifically, the second brake member 40 is accommodated in the second cavity 120b, and the second brake member 40 can move in a direction extending from the second cavity 120b to the first cavity 120a. The first position is the position of the second brake member 40 when the rotating shaft 20 is not subjected to a thrust in the direction of the second brake member 40 in the first state, that is, the position where the locking assembly 50 is connected to the second brake member 40 and locks the second brake member 40. The second position is the position of the second brake member 40 when the second brake member 40 is connected to the first brake member 30 after the rotating shaft 20 is subjected to a thrust in the direction of the second brake member 40 in the second state.

[0065] In some embodiments, a block is provided between one of the first brake member 30 and the second brake member 40 , and a slot is provided between the other of the first brake member 30 and the second brake member 40 . The block can be clamped in the slot to circumferentially limit the first brake member 30 .

[0066] In some embodiments, Figure 7 As shown, the second brake member 40 includes a second connection portion 410 and a clamping block 420, and the clamping block 420 is connected to one end of the second connection portion 410 facing the first brake member 30. The second connection portion 410 is partially disposed in the first joint 120, and the second connection portion 410 is sleeved on the rotating shaft 20. The second connection portion 410 is circumferentially fixed to the rotating shaft 20, and the second connection portion 410 can move relative to the rotating shaft 20. The second connection portion 410 can drive the clamping block 420 to move along the axial direction of the rotating shaft 20, so that the clamping block 420 is connected to the first brake member 30, thereby limiting the first brake member 30 from rotating relative to the second brake member 40.

[0067] In some embodiments, Figure 6As shown, the first brake member 30 is provided with a slot 30a, and the slot 30a extends from one end of the first brake member 30 toward the second brake member 40 toward the other end of the first brake member 30. When the block 420 is clamped in the slot 30a, the first brake member 30 can be restricted from rotating relative to the second brake member 40, thereby realizing the circumferential limit of the rotating shaft 20. It can be understood that in some other embodiments, the slot 30a can also be set on the second brake member 40, and correspondingly, the block 420 can be set on the first brake member 30. The arrangement of the block 420 and the slot 30a is not limited here.

[0068] In this embodiment, the slot 30a is a through hole, that is, the slot 30a passes through the first connection portion 310 and the limiting portion 320. It can be understood that in some other embodiments, the slot 30a can also be a blind hole, that is, the slot 30a extends from one end of the limiting portion 320 toward the first connection portion 310.

[0069] In this example, the slot 30a is an arc slot, and the shape of the block 420 matches the shape of the slot 30a. It is understandable that in some other embodiments, the shape of the slot 30a can also be set according to actual needs, such as a circular slot, a square slot, etc., which is not limited here.

[0070] In some embodiments, a slide groove is provided at one of the second brake member 40 and the housing 10, and a sliding key is provided at the other of the second brake member 40 and the housing 10, and the sliding key is movably disposed in the slide groove.

[0071] In some embodiments, Figure 7 As shown, the second brake member 40 is provided with a slide groove 40a, which is arranged on the outer wall of the second brake member 40, and the slide groove 40a penetrates the second brake member 40 along the axial direction of the second brake member 40, that is, the slide groove 40a extends from one end of the second brake member 40 toward the first brake member 30 to the other end of the second brake member 40. The housing 10 is provided with a slide key (not shown in the figure), which is arranged on the inner wall of the first joint 120, and the shape of the slide key is adapted to the shape of the slide groove 40a. The slide key is movably arranged in the slide groove 40a, so that the second brake member 40 is circumferentially fixed to the shell 110 of the housing 10, and the second brake member 40 can move relative to the housing 10 along the slide key. The slide key can be integrally formed with the first joint 120, or the slide key is a separate component. Among them, the axial direction of the second brake member 40 is the same as the axial direction of the rotating shaft 20. It is understandable that in some other embodiments, the slide groove may be provided on the housing 10, and correspondingly, the slide key may be provided on the second brake member 40. The arrangement of the slide groove 40a and the slide key is not limited herein.

[0072] In some embodiments, Figure 2 , Figure 8 and Fig. 9 As shown, the locking assembly 50 includes a slider 510, a push rod 520 and a first elastic member 530. The slider 510 is movably connected to the housing 10, and the push rod 520 is movably disposed in the housing 110 of the housing 10; along the axial direction of the rotating shaft 20, one end of the push rod 520 is slidably connected to the slider 510, and the other end of the push rod 520 is connected to the first brake member 30; along the radial direction of the rotating shaft 20, one end of the slider 510 is connected to the first elastic member 530, and the other end of the slider 510 is detachably connected to the second brake member 40. In the first state, the first elastic member 530 can apply an elastic force toward the second brake member 40 to the slider 510, so that the slider 510 is connected to the second brake member 40; in the second state, the first brake member 30 can drive the push rod 520 to move toward the second brake member 40, and the push rod 520 can drive the slider 510 to move in a direction away from the second brake member 40, so that the slider 510 is separated from the second brake member 40.

[0073] In some embodiments, the first joint 120 of the housing 10 is provided with a slider hole 120d (eg Figure 5 As shown in FIG. 1 , the slider hole 120d extends from the inner wall of the first joint 120 toward the outer wall of the first joint 120. The slider hole 120d is disposed on the protrusion 124, and the slider hole 120d is in communication with the second cavity 120b. The first elastic member 530 is received in the slider hole 120d, and at least a portion of the slider 510 is received in the slider hole 120d. The first elastic member 530 abuts against an end of the slider 510 that is away from the second brake member 40, and the slider 510 can slide in the slider hole 120d along the hole wall of the slider hole 120d.

[0074] In some embodiments, the outer wall of the second brake member 40 is provided with a limiting groove 40b (eg Figure 7 As shown in the figure, the limiting groove 40b is arranged along the circumference of the second brake member 40. In the first state, the second brake member 40 is located at the first position, and the limiting groove 40b is connected with the slider hole 120d along the aperture direction of the slider hole 120d. The first elastic member 530 can apply elastic force to the slider 510, so that one end of the slider 510 is clamped in the limiting groove 40b, so that the second brake member 40 is axially fixed to the housing 10, thereby realizing the axial limiting of the second brake member 40 and limiting the second brake member 40 to the first position. In the second state, the push rod 520 drives the slider 510 to move in the direction away from the limiting groove 40b, so that the slider 510 is separated from the limiting groove 40b.

[0075] In some embodiments, Fig. 9As shown, the slider 510 is provided with an inclined surface 511, which is inclined to the axial direction of the rotating shaft 20; the end of the push rod 520 away from the first brake member 30 can be slidably abutted against the inclined surface 511, and the push rod 520 can move relative to the housing 10 along the axial direction of the rotating shaft 20, driving the slider 510 to move relative to the housing 10 along the radial direction of the rotating shaft 20, so that the slider 510 is connected to or separated from the limiting groove 40b of the second brake member 40. Specifically, the inclined surface 511 is formed on the hole wall of the inclined hole inside the slider 510, and one end of the push rod 520 is inserted into the inclined hole. It should be noted that the hole in the slider 510 can be a through hole or a blind hole.

[0076] In some embodiments, Figure 5 As shown, the first joint 120 of the housing 10 is provided with a receiving hole 120e for the push rod 520 to pass through, and the extending direction of the receiving hole 120e is parallel to the axial direction of the first joint 120. Specifically, the receiving hole 120e is provided in the protrusion 124, and the receiving hole 120e extends from one end of the protrusion 124 toward the first cavity 120a toward the other end to communicate with the slider hole 120d. One end of the push rod 520 passes through the receiving hole 120e and abuts against the inclined surface 511. The receiving hole 120e guides the push rod 520 to prevent the push rod 520 from deflecting during the movement.

[0077] In some embodiments, Fig.10 As shown, the braking drive member 60 includes a second elastic member 610, which is disposed in the third cavity 120c. The second elastic member 610 abuts against one end of the second braking member 40 away from the first braking member 30. In the second state, the second elastic member 610 can drive the second braking member 40 to move toward the direction of the first braking member 30.

[0078] In some embodiments, the brake driver 60 further includes an absorber 620, which is disposed on a side of the second brake member 40 away from the first brake member 30, and an end of the second elastic member 610 away from the second brake member 40 abuts against the absorber 620. When resetting from the second state to the first state, the absorber 620 can apply an adsorption force to the second brake member 40, so that the second brake member 40 moves in a direction away from the first brake member 30 until the second brake member 40 is connected to the locking assembly 50.

[0079] In some embodiments, the attractor 620 includes an armature 621 and a magnetic member 622, wherein the armature 621 is fixed to an end of the second brake member 40 away from the first brake member 30, and the magnetic member 622 is fixed in the third cavity 120c of the first joint 120. The magnetic member 622 can absorb the armature 621 on the second brake member 40 to reset the second brake member 40 from the second position to the first position, thereby disengaging the second brake member 40 from the first brake member 30. It can be understood that in some other embodiments, the armature 621 can also be omitted, that is, the second brake member 40 itself is made of magnetic material, and the magnetic member 622 can directly absorb the second brake member 40.

[0080] In some embodiments, the magnetic member 622 is sleeved on the shaft 20, and the shaft 20 can rotate relative to the magnetic member 622. The magnetic member 622 is provided with a receiving cavity, and the second elastic member 610 is received in the receiving cavity and one end of the second elastic member 610 is fixed to the bottom of the receiving cavity, and the other end of the second elastic member 610 is used to connect with the second brake member 40.

[0081] In some embodiments, the magnetic member 622 is an electromagnet, that is, the magnetic member 622 can attract the armature 621 and the second brake member 40 when powered on, so as to reset the second brake member 40 from the second position to the first position.

[0082] In some embodiments, Fig.10 As shown, the submersible motor protector further includes a thrust bearing 70, which is disposed around the rotating shaft 20 and between the locking assembly 50 and the first brake member 30. The thrust bearing 70 includes a moving ring 710, a stationary ring 720 and a roller 730. The moving ring 710 of the thrust bearing 70 is connected to the first brake member 30, and the stationary ring 720 of the thrust bearing 70 is connected to the push rod 520. The first brake member 30 can drive the thrust bearing 70 to move toward the direction of the second brake member 40, and the first brake member 30 can drive the moving ring 710 of the thrust bearing 70 to rotate relative to the housing 10.

[0083] In some embodiments, the thrust bearing 70 is disposed in the first cavity 120a, and the thrust bearing 70 can move in the first cavity 120a along the axial direction of the rotating shaft 20. When the rotating shaft 20 drives the first brake member 30 to move toward the second brake member 40, the thrust bearing 70 is driven to move together to cooperate with the locking assembly 50 to release the second brake member 40, so that the second brake member 40 moves from the first position to the second position. Specifically, one end of the push rod 520 is fixed to the thrust bearing 70, and the other end of the push rod 520 cooperates with the slider 510. When the thrust bearing 70 moves, the push rod 520 pushes the slider 510, so that the slider 510 is separated from the limiting groove 40b of the second brake member 40.

[0084] In some embodiments, the thrust bearing 70 is a thrust roller bearing, and the moving ring 710 and the stationary ring 720 of the thrust bearing 70 are arranged at intervals along the axial direction of the rotating shaft 20, and the roller 730 is arranged between the moving ring 710 and the stationary ring 720. The moving ring 710 and the stationary ring 720 are both arranged around the rotating shaft 20, and the end of the moving ring 710 away from the stationary ring 720 is connected to the first brake member 30, and the end of the stationary ring 720 away from the moving ring 710 is connected to the push rod 520, and the second brake member 40 can pass through the stationary ring 720 and the moving ring 710 in sequence to connect with the first brake member 30. Among them, the circumferential direction of the moving ring 710 and the first joint 120 is not fixed, that is, the moving ring 710 can rotate relative to the first joint 120 following the first brake member 30. Furthermore, the moving ring 710 and the stationary ring 720 can move together along the axis direction of the first joint 120, that is, the first brake member 30 can push the moving ring 710 to move toward the stationary ring 720, and then push the push rod 520 through the stationary ring 720. It can be understood that in some other embodiments, the structure of the thrust bearing 70 can also be set according to actual needs, such as being set to a thrust ball bearing, a thrust sliding bearing, etc., which are not limited here.

[0085] In some embodiments, a limiter (not shown) is provided at one end of the thrust bearing 70 facing the first brake member 30, and the limiter is disposed in the first cavity 120a. The limiter can limit the thrust bearing 70 from being separated from the first cavity 120a, and the thrust bearing 70 can move between the limiter and the protrusion 124. In the first state, the thrust bearing 70 can abut against the limiter, and in the second state, the thrust bearing 70 can move toward the direction of the protrusion 124. In this embodiment, the limiter is an elastic retaining ring. It can be understood that in some other embodiments, the structure of the limiter can be set according to actual needs, such as being set as a limiter block, a limiter pipe clamp, etc., which is not limited here.

[0086] In some embodiments, Figure 2 and Fig.10 As shown, the submersible motor protector also includes a bearing group 80, which is movably arranged in the housing 110 of the housing 10, and the bearing group 80 is sleeved on the rotating shaft 20, and the bearing group 80 is arranged on the side of the first brake member 30 away from the second brake member 40. Among them, the outer ring of the bearing group 80 is movably connected to the inner wall of the housing 110 of the housing 10, and the outer ring of the bearing group 80 and the housing 110 are circumferentially fixed; the inner ring of the bearing group 80 is sleeved on the rotating shaft 20, and the rotating shaft 20 can drive the inner ring of the bearing group 80 to rotate relative to the outer ring of the bearing group 80, and the rotating shaft 20 can drive the bearing group 80 to move relative to the housing 110 along the axial direction of the rotating shaft 20. Among them, the bearing group 80 includes at least one bearing, and at least one bearing is sequentially arranged along the axial direction of the rotating shaft 20.

[0087] In some embodiments, Fig.10As shown, the submersible motor protector further includes a reset assembly 90, which is disposed in the housing 110 of the housing 10, and the reset assembly 90 is connected to the first brake member 30 and / or the second brake member 40. When resetting from the second state to the first state, the reset assembly 90 can drive the first brake member 30 to move in a direction away from the second brake member 40; or the reset assembly 90 can drive the second brake member 40 to move in a direction away from the first brake member 30, so that the first brake member 30 and the second brake member 40 are separated.

[0088] In some embodiments, the reset assembly 90 includes a third elastic member 910. The third elastic member 910 is disposed in the housing 110 of the housing 10, and the third elastic member 910 is connected to one end of the thrust bearing 70 facing the locking assembly 50. Specifically, the third elastic member 910 is placed in the third cavity 120c and is disposed between the thrust bearing 70 and the protrusion 124, and the two ends of the third elastic member 910 abut against the thrust bearing 70 and the protrusion 124 respectively. When resetting from the second state to the first state, the third elastic member 910 can apply an elastic force to the thrust bearing 70, so that the thrust bearing 70 and the push rod 520 move toward the direction of the first brake member 30. At this time, the push rod 520 can be withdrawn from the inclined surface 511, so that the slider 510 presses the second brake member 40 under the elastic force of the first elastic member 530.

[0089] It can be understood that in the second state, the rotating shaft 20 is subjected to a thrust toward the second brake member 40, causing the thrust bearing 70 to push the push rod 520 and compress the third elastic member 910, causing the slider 510 to disengage from the limiting groove 40b to release the second brake member 40, and causing the second brake member 40 to move toward the direction of the first brake member 30.

[0090] In some embodiments, the reset assembly 90 further includes a fourth elastic member 920, which is disposed in the housing 110 of the housing 10, and the fourth elastic member 920 is connected to one end of the bearing group 80 facing the second brake member 40. Specifically, the fourth elastic member 920 is disposed between the first latch 122 and the bearing group 80, and the two ends of the fourth elastic member 920 abut against the first latch 122 and the bearing group 80, respectively. When resetting from the second state to the first state, the fourth elastic member 920 can apply an elastic force to the bearing group 80, so that the bearing group 80 and the rotating shaft 20 move in a direction away from the second brake member 40. It can be understood that in the second state, the rotating shaft 20 is subjected to a thrust in the direction of the second brake member 40, and the rotating shaft 20 carries the bearing group 80 and the first brake member 30 to move toward the second brake member 40 and compress the fourth elastic member 920.

[0091] In this embodiment, the first elastic member 530, the second elastic member 610, the third elastic member 910 and the fourth elastic member 920 are all springs. It is understandable that in some other embodiments, the structures of the first elastic member 530, the second elastic member 610, the third elastic member 910 and the fourth elastic member 920 can be set according to actual needs, such as disc springs, spring sheets, etc., which are not limited here.

[0092] In some embodiments, the submersible motor protector further includes a coupling, which is connected to one end of the rotating shaft 20 close to the first joint 120 , and is used to connect the screw pump of the submersible unit to the rotating shaft 20 .

[0093] The specific structural operating principle of the submersible motor protector in the embodiment of the present application is as follows:

[0094] The submersible motor is controlled to rotate and drive the submersible screw pump unit to operate. The axial force generated by the lifting of the screw pump is transmitted downward. After reaching the shaft, the axial force is borne by the shaft. During normal operation, the shaft overcomes the axial force to prevent the axial force from continuing to be transmitted downward. After a long period of operation, wax deposition occurs in the well, causing the lifting force of the screw pump to increase until the shaft is overloaded. After the shaft is overloaded, the strong axial force pushes the shaft downward, and the first brake member fixed on the shaft moves downward with the shaft until it presses against the thrust bearing. The thrust bearing continues to transmit the axial force downward, pushing the push rod, which pushes the slider outward and compresses the first elastic member. This action causes the slider to disengage from the second brake member, which was previously in a compressed state. Due to the elastic force of the second elastic member, the second brake member is ejected upward, so that the second brake member moves toward the first brake member and connects with the first brake member. Since the second brake member cannot rotate relative to the first joint of the housing, the first brake member is forced to stop rotating, and the shaft stops rotating accordingly. At this time, the screw pump unit is in a stopped state, the lifting reaction force of the screw pump disappears, and the motor is in a blocked state. Due to the motor blocking, an overcurrent alarm is generated, the motor stops supplying power, and the submersible unit stops. For the convenience of description, this application defines the downward direction as the direction in which the second joint extends toward the first joint.

[0095] After shutdown, the attractor is energized and attracted to reset the second brake member from the second state to the first state. As the axial force of the screw pump disappears, the fourth elastic member presses the bearing assembly to the initial position (the position in the first state), and the third elastic member presses the push rod and the thrust bearing to the initial position (the position in the first state). As the push rod is pulled out of the inclined surface of the slider, the first elastic member presses the slider into the limiting groove of the second brake member, and the locking assembly is reset to the first state.

[0096] Adjust the parameters, restart the machine, and the shaft works normally until the shaft is overloaded again. Repeat the above actions to extend the service life of the submersible unit. Until the shaft itself fails and cannot be reset, the motor cannot start. At this time, the submersible unit is taken out from the well. Except for the shaft, other parts can be maintained and used normally, reducing after-sales maintenance costs and increasing the utilization rate of various after-sales parts.

[0097] The submersible motor protector of the embodiment of the present application can prevent the shaft from continuing to rotate after the shaft is overloaded, protect other components of the unit and perform emergency shutdown, and perform feedback shutdown on the motor to prevent the axial force generated by the screw pump from continuing to rotate and lift and causing damage to other components of the unit. In addition, the submersible motor protector is reset after shutdown so that it can be used again after adjusting parameters next time.

[0098] The present application also provides a submersible screw pump, including the above-mentioned submersible motor protector. The structure and function of the submersible motor protector can be referred to the above-mentioned embodiments, which will not be described in detail here.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Under the concept of the present application, the technical features in the above embodiments or different embodiments may also be combined, the steps may be implemented in any order, and there are many other changes in different aspects of the present application as described above, which are not provided in detail for the sake of simplicity. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A submersible motor protector, characterized in that: include: shell; A rotating shaft is rotatably disposed in the housing; A first brake member is disposed in the housing and fixed to the rotating shaft; a second brake member, movably disposed in the housing, the second brake member being circumferentially fixed to the housing, and disposed on one side of the first brake member along the axis direction of the rotating shaft; A locking assembly, disposed on the housing, the locking assembly being connected to the first brake member, and the locking assembly being detachably connected to the second brake member; a brake driving member, the brake driving member being connected to the second brake member; In the first state, the locking assembly is connected to the second brake member to limit the axial position of the second brake member, the first brake member is separated from the second brake member, and the rotating shaft can drive the first brake member to rotate relative to the housing; In the second state, the rotating shaft is subjected to a thrust force toward the second brake member, the rotating shaft can drive the first brake member to move toward the second brake member, the first brake member can drive the locking assembly to separate from the second brake member, and the brake driving member can drive the second brake member to move toward the first brake member, so that the second brake member is connected to the first brake member to circumferentially limit the first brake member.

2. The submersible motor protector according to claim 1, characterized in that: The locking assembly includes a push rod, a slider and a first elastic member, the push rod is movably disposed in the housing, and the slider is movably connected to the housing; Along the axis direction of the rotating shaft, one end of the push rod is slidably connected to the sliding block, and the other end of the push rod is connected to the first brake member; Along the radial direction of the rotating shaft, one end of the slider is connected to the first elastic member, and the other end of the slider is detachably connected to the second braking member; In the first state, the first elastic member may apply an elastic force to the slider in a direction toward the second braking member, so that the slider is connected to the second braking member; In the second state, the first brake member can drive the push rod to move toward the second brake member, and the push rod can drive the slider to move away from the second brake member, so that the slider is separated from the second brake member.

3. The submersible motor protector according to claim 2, characterized in that: The slider is provided with an inclined surface, and the inclined surface is inclined to the axial direction of the rotating shaft; One end of the push rod can be slidably abutted against the inclined surface, and the push rod can move relative to the housing along the axial direction of the rotating shaft, driving the slider to move relative to the housing along the radial direction of the rotating shaft, so that the slider is connected to or separated from the second brake member.

4. The submersible motor protector according to claim 2, characterized in that: A limiting groove is provided on the circumference of the second brake member, and one end of the slider can be clamped in the limiting groove, so that the second brake member is axially fixed to the housing; and / or The housing is provided with a slider hole, the slider hole extends from the inner wall of the housing toward the outer wall of the housing, the slider is at least partially accommodated in the slider hole, and the slider can move in the slider hole.

5. The submersible motor protector according to claim 2, characterized in that: The submersible motor protector further comprises a thrust bearing, which is movably disposed in the housing, annularly disposed on the rotating shaft, and disposed between the first brake member and the locking assembly; The moving ring of the thrust bearing is connected to the first brake member, and the stationary ring of the thrust bearing is connected to the push rod. The first brake member can drive the thrust bearing to move toward the second brake member, and the first brake member can drive the moving ring of the thrust bearing to rotate relative to the housing.

6. The submersible motor protector according to claim 5, characterized in that: The submersible motor protector further comprises a third elastic member, wherein the third elastic member is connected to one end of the thrust bearing facing the locking assembly, and when the second state is reset to the first state, the third elastic member can apply an elastic force to the thrust bearing so that the thrust bearing and the push rod move toward the direction of the first brake member; and / or The submersible motor protector also includes a bearing group and a fourth elastic member. The bearing group is movably arranged in the outer shell, the bearing group is sleeved on the rotating shaft, and the bearing group is arranged on the side of the first brake member away from the second brake member. The fourth elastic member is connected to one end of the bearing group facing the second brake member. When resetting from the second state to the first state, the fourth elastic member can apply an elastic force to the bearing group to make the bearing group and the rotating shaft move in the direction away from the second brake member.

7. The submersible motor protector according to claim 1, characterized in that: The brake driving member comprises a second elastic member, the second elastic member abuts against an end of the second brake member away from the first brake member; In the second state, the second elastic member can drive the second braking member to move toward the first braking member.

8. The submersible motor protector according to claim 7, characterized in that: The brake driving member further comprises a sucker, and the sucker is arranged on a side of the second brake member facing away from the first brake member; When resetting from the second state to the first state, the attractor can apply an adsorption force to the second brake member, so that the second brake member moves in a direction away from the first brake member until the second brake member is connected to the locking assembly.

9. The submersible motor protector according to any one of claims 1 to 8, characterized in that: A clamping block is disposed between one of the first brake member and the second brake member, and a clamping groove is disposed between the other of the first brake member and the second brake member, wherein the clamping block can be clamped in the clamping groove to limit the circumferential position of the first brake member; and / or One of the second brake member and the housing is provided with a slide groove, and the other of the second brake member and the housing is provided with a slide key, and the slide key is movably arranged in the slide groove.

10. The submersible motor protector according to claim 1, characterized in that: The submersible motor protector also includes a reset component; The reset assembly is connected to the first brake member and / or the second brake member; When resetting from the second state to the first state, the resetting component may drive the first brake member to move in a direction away from the second brake member, and / or the resetting component may drive the second brake member to move in a direction away from the first brake member; So that the first braking member and the second braking member are separated.

11. A submersible screw pump, characterized in that: It comprises a submersible motor protector as described in any one of claims 1 to 10.

Images