Spiral dampers for low speed rotating devices

Abstract

The present invention discloses a spiral damper used in a low-speed rotating device, including an oil pan, a sealed oil chamber is provided in the oil pan, the oil chamber is filled with a viscous fluid medium, an inner shell is provided in the oil chamber, and the oil chamber is divided into an inner oil chamber and an outer oil chamber by the shell, a first oil hole is provided on the inner shell near its left end, a second oil hole is provided on the inner shell near its right end, a rubber screw rod with an interference fit with the inner shell is provided in the inner oil chamber, the rubber screw rod is movably connected to the oil pan, a movable latch is provided on the oil pan, the latch is inserted into the oil chamber, and an adjustable gap is reserved between the bottom end of the latch and the orifice of the first oil hole, the latch is provided with a spring that drives it to be pressed down and inserted into the first oil hole, and the outer oil chamber and the inner oil chamber can only communicate with each other through the gap or the second oil hole. The present invention has an ingenious structure, which hinders the rotation of the pay-off drum that rotates too fast, improves the wire-out speed of the pay-off drum, and tries to make the wire-out speed of the pay-off drum uniform during the process of winding the steel wire with the hose.

Description

Technical Field

[0001] The invention relates to the field of dampers, and in particular to a spiral damper used in a low-speed rotating device. Background Art

[0002] Drilling hose is the customary name for "rubber hose for rotary drilling and shock absorption", commonly known as "water hose". In geological and petroleum rotary drilling, large volumes of fluid mud need to be transported to the drill bit under high pressure, and the rotary drilling hose is used as a flexible connector in the mud delivery pipeline.

[0003] Existing drilling hoses generally include an inner rubber layer and a steel wire winding layer. Figure 1 The figure shows a conventional wire winding diagram of a drilling hose, and the winding process is as follows: first, a pay-off drum 111 with a wire winding is placed in a wheel, and then a wire 112 is fixedly wound around the end of a hose 113, and then the hose is driven by a motor 114 to rotate forward along a straight line for a predetermined stroke to complete the wire winding of the hose. When the hose rotates forward, the wire pulls the pay-off drum to rotate.

[0004] However, technicians found that on the rubber hose with completed steel wire winding, among the several turns of steel wire wound on the inner rubber tape, some of the steel wires were tightly embedded in the inner rubber tape, while the other parts had a large gap between them and the inner rubber tape and were relatively loose.

[0005] The main reason why the steel wire is wound on the inner tape with different degrees of tightness is that the speed at which the pay-off drum feeds the steel wire is uneven. One of the problems that causes the uneven rotation speed of the pay-off drum on the wheel is the weight of the pay-off drum. When the hose is winding the steel wire, the steel wire wound on the pay-off drum is shortened and the wire feeding speed of the pay-off drum is accelerated, causing the subsequent steel wire wound on the hose to be too loose.

[0006] In order to solve the problem of uneven wire delivery speed of the pay-off drum, the technicians decided to add a bearing between the shaft and the wheel (the wheel shaft is fixedly connected to the pay-off drum, and the pay-off drum drives the wheel shaft to rotate on the wheel disc) to reduce the friction between the wheel shaft and the wheel disc, so that the pay-off speed of the pay-off drum is as consistent as possible throughout the whole process. However, adding a bearing between the shaft and the wheel disc will inevitably lead to too fast wire delivery speed of the pay-off drum, so that the steel wire wrapped on the inner rubber tape is too loose. For this reason, the technicians in this field designed a damper. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide a spiral damper used in a low-speed rotating device to hinder the rotation of a pay-off drum that rotates too fast, improve the wire output speed of the pay-off drum, and make the wire output speed of the pay-off drum as uniform as possible during the process of winding the wire around the hose.

[0008] The technical solution adopted by the present invention to solve the above technical problems is: a spiral damper used in a low-speed rotating device includes an oil pan, a closed oil chamber is provided in the oil pan, the oil chamber is filled with a viscous fluid medium, an inner shell is provided in the oil chamber, the inner shell divides the oil chamber into an inner oil chamber and an outer oil chamber, a first oil hole is provided on the inner shell near its left end, a second oil hole is provided on the inner shell near its right end, a rubber screw rod with an interference fit with the inner shell is provided in the inner oil chamber, the rubber screw rod is movably connected to the oil pan, a movable latch is provided on the oil pan, the latch is inserted into the oil chamber, and an adjustable gap is reserved between the bottom end of the latch and the orifice of the first oil hole, the latch is provided with a spring that drives it to be pressed down and inserted into the first oil hole, and the outer oil chamber and the inner oil chamber can only communicate with each other through the gap or the second oil hole.

[0009] A further preferred solution of the present invention is as follows: the latch comprises an upper body, a shaft shoulder and a lower body, a support is provided on the outside of the oil pan, the latch is movably connected to the support, the spring is sleeved on the upper body, one end of the spring abuts against the support, the other end of the spring abuts against the shaft shoulder, and the lower body is inserted into the oil chamber. The spring arranged between the support and the shaft shoulder mainly applies pressure to the latch, so that the latch is resisted when floating up, so that the gap between the first oil hole and the bottom end of the latch is adjustable.

[0010] A further preferred solution of the present invention is that the rubber screw rod comprises a rotatable shaft body and a damping sleeve arranged on the shaft body, the damping sleeve is arranged in a spiral shape along the axial direction of the shaft body, and the damping sleeve is interference fit with the inner shell body.

[0011] A further preferred solution of the present invention is that the damping sleeve comprises an outer layer made of rubber. The damping sleeve made of rubber has good sealing performance.

[0012] A further preferred embodiment of the present invention is as follows: the oil pan comprises a front cover and a rear cover, the front cover and the rear cover are respectively provided with a first bearing and a second bearing, the front end of the shaft body is movably connected to the first bearing, and the rear end of the shaft body is movably connected to the second bearing.

[0013] A further preferred embodiment of the present invention is as follows: the first bearing and the second bearing are both deep groove ball bearings.

[0014] Compared with the prior art, the advantages of the present invention are simple structure and ingenious design, which can hinder the rotation of the pay-off drum that rotates too fast, improve the wire output speed of the pay-off drum, and make the wire output speed of the pay-off drum as uniform as possible during the process of winding the wire around the hose.

[0015] The fluid medium arranged in the oil chamber of the oil pan is viscous, which can cause the bearing to experience a certain degree of resistance when it rotates; the first oil hole arranged on the left end side of the inner shell body and the second oil hole arranged on the right end side of the inner shell body are mainly used to connect the inner oil chamber with the outer oil chamber, and the rubber screw rod arranged in the inner oil chamber can be connected to the rotating shaft or the wire reel. When the rubber screw rod rotates, it can transport the fluid medium in the inner oil chamber in one direction. The movable pin arranged in the oil chamber is used to adjust the gap between the pin and the first oil hole when the pin is moving (floating up or pressing down).

[0016] In simple terms, after the pay-off drum is connected to one end of the rubber screw rod, the pay-off drum drives the rubber screw rod to rotate rapidly (about 20~30r / min) in a predetermined direction (the direction of conveying the fluid medium to the outer oil chamber through the first oil hole). Since the fluid medium in the inner oil chamber is viscous, the rubber screw rod will encounter a certain degree of resistance when rotating, thereby slowing down the rotation speed of the rubber screw rod (about 15~20r / min). Furthermore, inside the oil pan, the fluid medium in the outer oil chamber enters the inner oil chamber through the second oil hole, and the rotation of the rubber screw rod drives the inner fluid medium to flow and to the outside through the first oil hole. The oil chamber transports the fluid medium, thus forming a cycle, and when the rubber screw rotates to drive the internal fluid medium to the first oil hole, the pressure at the first oil hole increases, and the pin is pushed upward, driving the gap to increase. However, since the pin is covered with a spring (within the adaptable range of the spring force), the greater the upward thrust on the pin, the greater the downward force on the pin. The gap can be adaptively adjusted to ensure that its opening size is stable, and ultimately achieve a nearly uniform rotation speed of the rubber screw, improve the wire delivery speed of the pay-off reel, and try to make the wire delivery speed of the pay-off reel uniform during the process of winding the hose around the wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a simplified diagram of the traditional wire winding of the hose;

[0018] Figure 2 It is a schematic diagram of the structure of the present invention. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] like Figure 1 to Figure 2 As shown: a spiral damper used in a low-speed rotating device includes an oil pan 1, which is in the shape of a disc. The oil pan 1 is provided with a closed and cylindrical oil chamber, which is filled with a viscous fluid medium. A cylindrical inner shell 2 is provided in the oil chamber to divide the oil chamber into an inner oil chamber 3 and an outer oil chamber 4. The inner shell 2 is provided with a first oil hole 5 near its left end (for conveying the fluid medium from the inner oil chamber 3 to the outer oil chamber 4), and a second oil hole 6 is provided near its right end (for conveying the fluid medium from the inner oil chamber 3 to the outer oil chamber 4). The outer oil chamber 4 conveys fluid medium to the inner oil chamber 3), and the inner oil chamber 3 is provided with a rubber screw rod 7 which is interference fit with the inner shell 2, and the rubber screw rod 7 is movably connected to the oil pan 1. A movable latch 8 is provided on the oil pan 1, and the latch 8 is inserted into the oil chamber, and an adjustable gap 9 is reserved between the bottom end of the latch 8 and the opening of the first oil hole 5. The latch 8 is provided with a spring 11 which drives it to be pressed down and inserted into the first oil hole 5. The outer oil chamber 4 and the inner oil chamber 3 can only communicate with each other through the gap 9 or the second oil hole 6.

[0023] The latch 8 includes an upper body 81, a shoulder 82 and a lower body 83. A support member 10 is provided on the outside of the oil pan 1. The latch 8 is movably connected to the support member 10. The spring 11 is sleeved on the upper body 81, and one end of the spring 11 is against the support member 10, and the other end of the spring 11 is against the shoulder 82. The lower body 83 is inserted into the oil chamber.

[0024] The rubber spiral rod 7 includes a rotatable shaft body 71 and a damping sleeve 72 arranged on the shaft body 71 . The damping sleeve 72 is arranged in a spiral shape along the axial direction of the shaft body 71 , and the damping sleeve 72 is interference fit with the inner housing 2 .

[0025] The damping sleeve 72 includes an outer layer 721 made of rubber.

[0026] The oil pan 1 includes a front cover 12 and a rear cover 13 . The front cover 12 and the rear cover 13 are respectively provided with a first bearing 14 and a second bearing 15 . The front end of the shaft body 71 is movably sleeved with the first bearing 14 , and the rear end of the shaft body 71 is movably sleeved with the second bearing 15 .

[0027] The first bearing 14 and the second bearing 15 are both deep groove ball bearings.

[0028] The pay-off drum is connected to the rubber screw rod 7. When the pay-off drum discharges the steel wire, the pay-off drum drives the rubber screw rod 7 to rotate clockwise, and the outer oil chamber 4 transports the fluid medium to the first oil hole 5 through the second oil hole 6. The outer oil chamber 4 and the inner oil chamber 3 realize the flow circulation of the fluid medium through the first oil hole 5 and the second oil hole 6. The rubber screw rod 7 rotates, and the fluid medium retained between the grooves of the damping sleeve 72 in the inner oil chamber 3 is transported to the first oil hole 5. The pin 8 is subjected to an upward thrust, but because the spring 11 sleeved on the pin 8 applies pressure to the pin 8, the gap 9 between the pin 8 and the first oil hole 5 can be adaptively adjusted according to the rotation speed of the rubber screw rod 7, so that the opening size of the gap 9 tends to be constant, so as to achieve a nearly uniform rotation speed of the rubber screw rod 7, improve the wire outlet speed of the pay-off drum, and try to make the wire outlet speed of the pay-off drum uniform in the process of winding the steel wire with the hose.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. The spiral damper used in low-speed rotating devices is characterized by The invention comprises an oil pan, wherein the oil pan is provided with a sealed oil cavity, the oil cavity is filled with a viscous fluid medium, an inner shell is provided in the oil cavity, the inner shell divides the oil cavity into an inner oil cavity and an outer oil cavity, the inner shell is provided with a first oil hole near its left end, the first oil hole is used to transport the fluid medium from the inner oil cavity to the outer oil cavity, the inner shell is provided with a second oil hole near its right end, the second oil hole is used to transport the fluid medium from the outer oil cavity to the inner oil cavity, the inner oil cavity is provided with a rubber screw rod which is interference fit with the inner shell, the rubber screw rod is movably connected with the oil pan, the oil pan is provided with a movable latch, the latch is inserted into the oil cavity, and an adjustable gap is reserved between the bottom end of the latch and the orifice of the first oil hole, the latch is provided with a spring which drives it to be pressed down and inserted into the first oil hole, and the outer oil cavity and the inner oil cavity can only be communicated with each other through the gap or the second oil hole; The latch comprises an upper body, a shaft shoulder and a lower body. A support is provided on the outer side of the oil pan. The latch is movably connected to the support. The spring is sleeved on the upper body, and one end of the spring abuts against the support, while the other end of the spring abuts against the shaft shoulder. The lower body is inserted into the oil chamber. The rubber spiral rod comprises a rotatable shaft body and a damping sleeve arranged on the shaft body. The damping sleeve is arranged in a spiral shape along the axial direction of the shaft body, and the damping sleeve is interference-fitted with the inner shell body.

2. The spiral damper used in a low-speed rotating device according to claim 1, characterized in that The damping sleeve comprises an outer layer made of rubber.

3. The spiral damper used in a low-speed rotating device according to claim 1, characterized in that The oil pan comprises a front cover and a rear cover, wherein the front cover and the rear cover are respectively provided with a first bearing and a second bearing, the front end of the shaft body is movably sleeved with the first bearing, and the rear end of the shaft body is movably sleeved with the second bearing.

4. The spiral damper used in a low-speed rotating device according to claim 3, characterized in that The first bearing and the second bearing are both deep groove ball bearings.

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