An automatic disengagement and resetting coupling

Abstract

The present invention provides an automatic disengagement and resetting coupling, comprising a pump connector, a connecting shaft and a limiter which are coaxially flange-connected in sequence, wherein the limiter comprises a connector connected to the connecting shaft at one end, the other end of the connector is rotatably connected to the shaft sleeve, and a disengagement mechanism is provided between the shaft sleeve and the connector; the disengagement mechanism comprises a mounting seat fixed to the shaft sleeve, a push rod is provided in the mounting seat, and a disc spring is pressed between one end of the push rod and the inner wall of the mounting seat; in the present invention, the connection between the main motor shaft and the fracturing pump shaft of the electric-driven fracturing skid is achieved through the cooperation of the pump connector, the connecting shaft, the connector and the shaft sleeve, and at the same time, a disengagement mechanism is provided between the connector and the shaft sleeve, so that the main motor shaft and the fracturing pump shaft have the ability to be disengaged from the transmission, and when the torque is overloaded during the transmission process, the main motor shaft and the fracturing pump shaft can be synchronously protected by disengaging the transmission, thereby avoiding mechanical damage caused by torque overload and increasing the service life of the electric-driven fracturing skid.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric-driven fracturing skids, and in particular relates to an automatic disengagement and resetting coupling. Background Art

[0002] At present, the application proportion of electric-driven fracturing skids in the entire fracturing pumping equipment is gradually increasing, and it is the future development direction of fracturing pumping equipment.

[0003] The skid-mounted electric fracturing skid drives the fracturing pump through the connecting shaft by the main motor to perform fracturing operations. Due to the large torque transmitted, the drive shaft generally uses a universal joint connecting shaft. The universal joint connecting shaft can adapt to high-torque conditions and has a large allowable installation deviation. The installation accuracy requirements for the active and passive equipment on both sides of the shaft are low. However, the universal joint connecting shaft itself is long, and there is no mechanical disconnection mechanism between the main motor and the fracturing pump. When the motor fails or the torque is overloaded, the electronic control system needs to shut down the main motor for protection. This method has a greater impact on the main motor and is a severe test for the main motor bearings and torque transmission mechanism. It will directly affect the life of the main motor and even cause mechanical damage.

[0004] How to design an automatic disengagement and resetting coupling and how to achieve overload protection are issues that need to be solved urgently. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide an automatic disengagement and resetting coupling to solve the problem in the prior art that the connection and transmission shafts are generally fixed and have no overload protection function.

[0006] To achieve the above-mentioned object, the present invention provides an automatically disengaging and resetting coupling, comprising a pump connection body, a connecting shaft, and a limiter coaxially connected in sequence by flanges, wherein the limiter comprises a connecting body connected to the connecting shaft at one end, the connecting body being rotatably connected to a sleeve at the other end, and a disengaging mechanism being provided between the sleeve and the connecting body;

[0007] The disengaging mechanism includes a mounting seat fixed to the shaft sleeve, a push rod is provided in the mounting seat, a disc spring is pressed between one end of the push rod and the inner wall of the mounting seat, and the other end of the push rod passes through the interior of the mounting seat and is limitedly engaged with a limit groove provided on the connector;

[0008] The push rod is integrally provided with a slip ring that slides and seals with the inner wall of the mounting seat. The inner side of the end of the mounting seat corresponding to the push rod is connected to a sealing ring that slides and seals with the outer wall of the push rod. The sealing ring and the slip ring cooperate to form an air chamber between the mounting seat and the push rod, and the air chamber is connected to the pressure supply port of the pressure pump.

[0009] By adopting this technical solution: the fracturing pump shaft of the electric-driven fracturing skid can be connected to the pump connector, and the main motor of the electric-driven fracturing skid can be connected to the shaft sleeve on the limiter. Through the cooperation of the pump connector, the connecting shaft, the connector and the shaft sleeve, the coaxial rotation connection of the main motor shaft and the fracturing pump shaft is realized. Under this premise, the top rod inside the mounting seat fixed to the shaft sleeve will extend out of the mounting seat under the reset action of the disc spring, and form a limit with the limit groove provided on the connector, thereby realizing the coaxial limit of the shaft sleeve and the connector, and then realizing the limit coupling of the main motor shaft and the fracturing pump shaft. The transmission can be carried out normally; when a torque overload problem occurs during the transmission process, the pressure pump can supply pressure to the inside of the air chamber, so that the pressure inside the air chamber increases, thereby pushing the push rod to compress the disc spring and separate it from the limit groove on the connector, releasing the limit state of the sleeve and the connector, and restoring the mutual rotation connection. At this time, the rotational force output by the main motor shaft will no longer be transmitted to the fracturing pump shaft side, realizing synchronous protection of the main motor and fracturing pump under torque overload state, avoiding the problem of mechanical damage caused by overload transmission, and indirectly increasing the service life of the electric drive fracturing skid equipment.

[0010] In one embodiment of the present invention, a first key is provided on the inner side wall of the pump connection body; the pump connection body, the connecting shaft and the connection body are connected in sequence through flange plates and bolt flanges; a second key is provided on the inner side wall of the sleeve.

[0011] By adopting this technical solution: a first key is set to facilitate the coaxial connection between the fracturing pump shaft and the pump connector; a flange is set to achieve the coaxial connection of the pump connector, the connecting shaft and the connector, and the connection is made detachable, which is convenient for subsequent disassembly and maintenance; a second key is set to facilitate the coaxial connection between the main motor shaft and the sleeve.

[0012] In one embodiment of the present invention, the inner side wall of the connector is fixed to the outer ring of the bearing, and the inner ring of the bearing is fixed to an end of the sleeve extending into the interior of the connector.

[0013] By adopting this technical solution: by adding a bearing to assist the rotational connection between the connector and the sleeve, the stability of the rotational connection is increased while reducing the rotational friction between the connector and the sleeve, avoiding the problem of the connector and the sleeve still transmitting to each other after the limit is released.

[0014] In one embodiment of the present invention, the decoupling mechanisms are evenly distributed around the circumference of the sleeve.

[0015] By adopting this technical solution: increasing the number of disengaging mechanisms to increase the number of matching groups of push rods and limit grooves, the stability of mutual limitation after the push rods and limit grooves are matched is ensured, avoiding the problem of poor limiting effect.

[0016] In one embodiment of the present invention, a dial is threadedly connected to one end of the mounting seat facing away from the connector, a guide column is passed through the dial, the guide column is coaxially and integrally connected to one end of the push rod pressing disc spring, and the disc spring is sleeved on the guide column.

[0017] By adopting this technical solution: the stability of the push rod moving inside the mounting seat is increased by setting a guide column and a dial, and at the same time the stability of the disc spring is increased by the guide column; at the same time, the compression force of the disc spring can be changed by rotating the dial position to adapt to the adjustment of the reset force of the push rod.

[0018] In one embodiment of the present invention, an air passage is provided on the mounting seat, one end of the air passage being connected to the interior of the sealing ring, the other end of the air passage is connected to and communicated with a pressure supply joint, the pressure supply joint is communicated with a pressure supply port of a pressure supply pump through a pressure supply pipe, the pressure supply pump is fixed on the mounting frame, and the mounting frame is fixed on the shaft sleeve.

[0019] By adopting this technical solution: by setting a mounting bracket on the shaft sleeve, the pressure supply pump and the shaft sleeve are integrated, thereby avoiding the problem of the pressure supply pipe being entangled on the shaft sleeve during the transmission process of the main motor shaft and the fracturing pump shaft of the electric-driven fracturing skid. Subsequently, only a power supply slip ring needs to be set to provide stable power supply to the pressure supply pump during the rotation process, thereby ensuring the feasibility of the structural setting.

[0020] In one embodiment of the present invention, a sheath fixed to the mounting seat is provided on the outer periphery of the shaft sleeve, one end of the sheath extends to the periphery of the connector, and the inner wall of the sheath is rotatably sealed with the outer wall of the connector.

[0021] By adopting this technical solution: a protective sleeve is added to protect the gap between the mounting seat and the connector, while not affecting the mutual rotation between the mounting seat and the connector, and preventing debris from falling into the gap and affecting the fit.

[0022] In one embodiment of the present invention, a torque sensor for monitoring overload is further included, and the torque sensor cooperates with the pressure supply pump.

[0023] By adopting this technical solution: setting up a torque sensor to monitor the transmission torque in real time, it is possible to cooperate with the pressure supply pump to achieve automatic overload protection.

[0024] As described above, the automatic disengagement and resetting coupling of the present invention has the following beneficial effects: the connection between the main motor shaft of the electric-driven fracturing skid and the fracturing pump shaft is realized through the cooperation of the pump connector, the connecting shaft, the connector and the sleeve, and at the same time, a disengagement mechanism is set between the connector and the sleeve, so that the main motor shaft and the fracturing pump shaft have the ability to disengage the transmission. When the torque is overloaded during the transmission process, the main motor shaft and the fracturing pump shaft can be synchronously protected by disengaging the transmission, avoiding mechanical damage caused by torque overload and increasing the service life of the electric-driven fracturing skid; the promotion and application has good economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the main structure of the present invention.

[0026] Figure 2 It is a main cross-sectional view of the present invention in the connected shaft state.

[0027] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0028] Figure 4 yes Figure 3 Enlarged view of point B in the middle.

[0029] Figure 5 It is a front cross-sectional view of the present invention in the disengaged state.

[0030] Figure 6 yes Figure 5 Enlarged view of point C in the middle.

[0031] In the figure: 1. Pump connector; 11. First key; 2. Connecting shaft; 3. Limiter; 31. Flange; 32. Connecting body; 33. Bushing; 34. Second key; 35. Bearing; 36. Mounting frame; 101. Mounting seat; 102. Dial; 103. Push rod; 104. Disc spring; 105. Limiting groove; 106. Slip ring; 107. Sealing ring; 108. Air chamber; 109. Pressure supply pump; 110. Pressure supply connector; 111. Air duct. DETAILED DESCRIPTION

[0032] The following describes the implementation of the present invention through specific embodiments. People skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0033] See also Figure 1-6. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they have no substantive technical significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0034] See also Figure 1-6 , an automatic disengagement and resetting coupling includes a pump connection body 1, a connecting shaft 2 and a limiter 3 which are coaxially flange-connected in sequence, wherein the limiter 3 includes a connecting body 32 connected to the connecting shaft 2 at one end, and the other end of the connecting body 32 is rotatably connected to the shaft sleeve 33 through a bearing 35; the fracturing pump shaft of the electric-driven fracturing skid can be connected to the pump connection body 1, and the main motor of the electric-driven fracturing skid can be connected to the shaft sleeve 33 on the limiter 3. Through the cooperation of the pump connection body 1, the connecting shaft 2, the connecting body 32 and the shaft sleeve 33, the coaxial transmission connection between the main motor shaft and the fracturing pump shaft is realized, providing the prerequisite for the coupling transmission between the main motor shaft and the fracturing pump shaft and the disengagement of the transmission when the torque is overloaded.

[0035] A disengaging mechanism is evenly distributed along the circumferential direction between the shaft sleeve 33 and the connecting body 32, and the disengaging mechanism includes a mounting seat 101 fixed to the shaft sleeve 33, and a push rod 103 is arranged in the mounting seat 101, and a disc spring 104 is pressed between one end of the push rod 103 and the inner wall of the mounting seat 101, and the other end of the push rod 103 passes through the interior of the mounting seat 101 and is limited by a limiting groove 105 provided on the connecting body 32; the push rod 103 inside the mounting seat 101 fixed to the shaft sleeve 33 will extend out of the interior of the mounting seat 101 under the resetting action of the disc spring 104, and form a limit with the limiting groove 105 provided on the connecting body 32, thereby realizing the coaxial limit of the shaft sleeve 33 and the connecting body 32, and then realizing the limit coupling of the main motor shaft and the fracturing pump shaft, so that transmission can be carried out normally.

[0036] The push rod 103 is integrally provided with a slip ring 106 that slides and seals with the inner wall of the mounting seat 101. The inner side of the end of the mounting seat 101 corresponding to the push rod 103 is connected to a sealing ring 107 that slides and seals with the outer wall of the push rod 103. The sealing ring 107 and the slip ring 106 cooperate to form an air chamber 108 between the mounting seat 101 and the push rod 103. The air chamber 108 is connected to the pressure supply port of the pressure supply pump 109. When a torque overload problem occurs during the transmission process, the pressure supply pump 109 can supply pressure to the interior of the air chamber 108. The pressure is supplied, so that the internal pressure of the air chamber 108 increases, thereby pushing the push rod 103 to compress the disc spring 104 and separate it from the limiting groove 105 on the connecting body 32, releasing the limiting state of the sleeve 33 and the connecting body 32, and restoring the mutual rotation connection. At this time, the rotational force output by the main motor shaft will no longer be transmitted to the fracturing pump shaft side, realizing synchronous protection of the main motor and fracturing pump under torque overload state, avoiding the problem of mechanical damage caused by overload transmission, and indirectly increasing the service life of the electric drive fracturing skid equipment.

[0037] Furthermore, an air passage 111 is provided on the mounting seat 101, one end of which is connected to the interior of the sealing ring 107, and the other end of the air passage 111 is connected and communicated with the pressure supply joint 110, and the pressure supply joint 110 is communicated with the pressure supply port of the pressure pump 109 through the pressure supply pipe. The pressure pump 109 is fixed on the mounting bracket 36, and the mounting bracket 36 is fixed on the shaft sleeve 33; by arranging the mounting bracket 36 on the shaft sleeve 33, the pressure pump 109 and the shaft sleeve 33 are set as one body, thereby avoiding the problem of the pressure supply pipe being entangled on the shaft sleeve 33 during the transmission process of the main motor shaft and the fracturing pump shaft of the electric drive fracturing skid. Subsequently, only a power supply slip ring needs to be set to provide stable power supply to the pressure pump 109 during the rotation process, thereby ensuring the feasibility of the structural setting.

[0038] It also includes a torque sensor for monitoring overload, which cooperates with the pressure supply pump 109; the torque sensor is set to monitor the transmission torque in real time, and can cooperate with the pressure supply pump 109 to achieve automatic overload protection.

[0039] The automatic disengagement and reset coupling can be used to connect the main motor shaft and the fracturing pump shaft of the electric-driven fracturing skid. In specific implementation, the main motor shaft of the electric-driven fracturing skid is connected to the pump connection body 1 through the first key 11, and the fracturing pump shaft is connected to the shaft sleeve 33 through the second key 34. At this time, the top rod 103 connected to the inside of the mounting seat 101 outside the shaft sleeve 33 will extend out of the inside of the mounting seat 101 under the action of the disc spring 104, and form a limit in the rotation direction with the limiting groove 105 on the connecting body 32. The power output by the main motor shaft will be directly transmitted to the connecting body 32, and then transmitted to the connecting shaft 2 and the pump connection body 1 in turn by the connecting body 32, and finally transmitted to the fracturing The pump shaft achieves normal transmission; when the torque sensor detects torque overload, the pressure pump 109 is started, and the pressure pump 109 will supply pressure to the air chamber 108 between the mounting seat 101 and the push rod 103, thereby pushing the push rod 103 to compress the disc spring 104, and the end of the push rod 103 will disengage from the limit groove 105, releasing the rotation limit of the connector 32 and the shaft sleeve 33. At this time, the power output by the main motor shaft will no longer be transmitted to the connector 32, nor will it be transmitted to the fracturing pump shaft, thereby realizing protection of the main motor shaft and the pressure pump shaft under torque overload conditions, avoiding the problem of mechanical damage caused by torque overload, and increasing the service life of the electric-driven fracturing skid.

[0040] In summary, the automatic disengagement and resetting coupling of the present invention has the following beneficial effects: the connection between the main motor shaft of the electric-driven fracturing skid and the fracturing pump shaft is achieved through the cooperation of the pump connector 1, the connecting shaft 2, the connector 32 and the sleeve 33, and at the same time, a disengagement mechanism is set between the connector 32 and the sleeve 33, so that the main motor shaft and the fracturing pump shaft have the ability to disengage the transmission. When the torque is overloaded during the transmission process, the main motor shaft and the fracturing pump shaft can be synchronously protected by disengaging the transmission, thereby avoiding mechanical damage caused by torque overload and increasing the service life of the electric-driven fracturing skid; the promotion and application of the coupling has good economic and social benefits. Therefore, the present invention effectively overcomes the various shortcomings of the prior art and has a high industrial utilization value.

[0041] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. An automatic disengagement and resetting coupling, characterized by: The invention comprises a pump connection body (1), a connecting shaft (2) and a limiter (3) which are coaxially connected in sequence by flanges, wherein the limiter (3) comprises a connecting body (32) connected to the connecting shaft (2) at one end, the connecting body (32) being rotatably connected to a shaft sleeve (33) at the other end, and a disengaging mechanism being provided between the shaft sleeve (33) and the connecting body (32); The disengaging mechanism includes a mounting seat (101) fixed to the shaft sleeve (33), a push rod (103) is provided in the mounting seat (101), a disc spring (104) is pressed between one end of the push rod (103) and the inner wall of the mounting seat (101), and the other end of the push rod (103) passes through the interior of the mounting seat (101) and is limitedly matched with a limiting groove (105) provided on the connecting body (32); The push rod (103) is integrally provided with a slip ring (106) that is in sliding and sealing cooperation with the inner wall of the mounting seat (101); the inner side of the end of the mounting seat (101) corresponding to the push rod (103) is connected to a sealing ring (107) that is in sliding and sealing cooperation with the outer wall of the push rod (103); the sealing ring (107) and the slip ring (106) cooperate to form an air chamber (108) between the mounting seat (101) and the push rod (103); the air chamber (108) is connected to the pressure supply port of the pressure supply pump (109).

2. The automatic disengagement and resetting coupling according to claim 1, characterized in that: A first key (11) is provided on the inner side wall of the pump connection body (1); the pump connection body (1), the connecting shaft (2) and the connecting body (32) are connected in sequence through a flange (31) and bolt flanges; a second key (34) is provided on the inner side wall of the shaft sleeve (33).

3. The automatic disengagement and resetting coupling according to claim 1, characterized in that: The inner side wall of the connecting body (32) is fixed to the outer ring of the bearing (35), and the inner ring of the bearing (35) is fixed to one end of the shaft sleeve (33) extending into the interior of the connecting body (32).

4. The automatic disengagement and resetting coupling according to claim 1, characterized in that: The decoupling mechanisms are evenly distributed in the circumferential direction of the shaft sleeve (33).

5. The automatic disengagement and resetting coupling according to claim 1, characterized in that: One end of the mounting seat (101) facing away from the connecting body (32) is threadedly connected to a dial plate (102), and a guide column is passed through the dial plate (102). The guide column is coaxially connected to one end of a disc spring (104) pressed by a push rod (103), and the disc spring (104) is sleeved on the guide column.

6. The automatic disengagement and resetting coupling according to claim 1, characterized in that: The mounting seat (101) is provided with an air passage (111) having one end connected to the interior of the sealing ring (107). The other end of the air passage (111) is connected to and communicates with a pressure supply connector (110). The pressure supply connector (110) is communicated with a pressure supply port of a pressure supply pump (109) through a pressure supply pipe. The pressure supply pump (109) is fixed on the mounting frame (36), and the mounting frame (36) is fixed on the shaft sleeve (33).

7. The automatic disengagement and resetting coupling according to claim 1, characterized in that: The outer sleeve of the shaft sleeve (33) is provided with a protective sleeve fixed to the mounting seat (101), one end of the protective sleeve extends to the periphery of the connector (32), and the inner wall of the protective sleeve is in rotational sealing cooperation with the outer wall of the connector (32).

8. The automatic disengagement and resetting coupling according to claim 1, characterized in that: The invention also comprises a torque sensor for monitoring overload, wherein the torque sensor cooperates with the pressure supply pump (109).

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