Direct drive motor of screw pump

Abstract

The invention relates to the technical field of oil field screw pumps, in particular to a screw pump direct drive motor. Comprising a direct-drive motor body, an air supply device is arranged above the direct-drive motor body, the bottom of the air supply device communicates with a plurality of air supply pipes, the air supply pipes are used for guiding airflow generated by the air supply device to the outer wall of the direct-drive motor body, and in a normal state, part of the air supply pipes are in a conducting state; the temperature control mechanism comprises a temperature sensing part and a flow guide part, the flow guide part is used for guiding cooling liquid for cooling the direct drive motor body into the temperature sensing part, and the temperature sensing part opens the end parts of the plurality of air supply pipes when the temperature of the cooling liquid rises. When the memory spring is compressed, the traction rope pulls the baffle to move, so that the air supply pipe is communicated with the air supply ring, and air flow in the air supply pipe is blown to the cooling fins through the air supply ring, so that the cooling range of the direct-drive motor body shell is increased, the direct-drive motor body shell can be uniformly covered by the air flow, and the cooling effect is improved.

Description

Technical Field

[0001] The invention relates to the technical field of oilfield screw pumps, in particular to a screw pump direct drive motor. Background Art

[0002] In oil field production, the direct drive motor is directly connected to the drive shaft of the screw pump. The motor converts electrical energy into mechanical energy. Secondly, the screw pump consists of one or more spiral rotors (screws) and a fixed stator. The motor drives the screw to rotate. When the screw rotates, the oil is sucked into the inlet area of ​​the pump and pushed toward the outlet of the pump along the spiral groove of the screw. Then, the screw pump reduces the volume of the oil by rotating the screw, generating enough pressure to draw the oil from the underground oil layer to the ground.

[0003] During the oil pumping process, excessive load on the motor will cause the shell temperature to rise, and the prior art often uses air cooling to dissipate heat from the motor, and when applied to oil pumping, natural air cooling is often used for cooling. However, when the external environment is stable (i.e., there is no wind and it is in a calm state), the shell cannot be cooled. Moreover, when the external wind direction is certain (the windward side is exposed to wind, and the leeward side is exposed to less wind), the external wind force acts on the shell, and the shell located on the back has a lower cooling effect on the back than on the windward side, thereby reducing the cooling effect. Summary of the invention

[0004] The object of the present invention is to provide a direct-drive motor for a screw pump to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the purpose of the present invention is to provide a screw pump direct-drive motor, including a direct-drive motor body, an air supply device is arranged above the direct-drive motor body, and a plurality of air supply pipes are connected to the bottom of the air supply device, and the air supply pipes are used to guide the airflow generated by the air supply device to the outer wall of the direct-drive motor body. Under normal conditions, some air supply pipes are in a conducting state, and a temperature control mechanism is arranged outside the direct-drive motor body, and the temperature control mechanism includes a temperature sensing part and a flow guide part. The flow guide part is used to guide the coolant for cooling the direct-drive motor body to the temperature sensing part. When the temperature of the coolant rises, the temperature sensing part opens the ends of the plurality of air supply pipes to achieve cooling of the direct-drive motor body.

[0006] As a further improvement of the present technical solution, the air supply device includes a shell body and a drive motor disposed inside the shell body, the shell body is fixed to the upper surface of the direct drive motor body, and the output shaft of the drive motor is coaxially connected to the fan blades.

[0007] As a further improvement of the technical solution, the ends of the multiple air supply pipes are connected to an air supply ring, the air supply ring is fixedly connected to the outer ring of the direct-drive motor body, and multiple exhaust holes are opened at the bottom of the air supply ring.

[0008] As a further improvement of the present technical solution, the guide part includes a storage ring, which is connected to the cooling ring above through a pipeline, the cooling ring is fixedly connected to the air supply ring, and the cooling ring is connected to the inside of the direct-drive motor body casing, the outside of the cooling ring is connected to one end of the guide pipe, and the other end of the guide pipe is connected to the storage ring, so that the coolant can circulate in the direct-drive motor body casing, the storage ring and the cooling ring.

[0009] As a further improvement of the present technical solution, the temperature sensing part includes a memory spring, which is in an extended state under normal conditions and in a compressed state under high temperatures. The upper end of the memory spring is fixedly connected to a slider, and the lower end is fixedly connected to the inner wall of a cooling ring. The slider is slidably connected to the cooling ring, and a traction rope is connected to the upper surface of the slider.

[0010] As a further improvement of the technical solution, the end of the traction rope is fixedly connected to a baffle, and the adapter box to which the baffle is slidably connected is fixed on the cooling ring, and the adapter box is connected to the air supply pipe and the air supply ring.

[0011] As a further improvement of the technical solution, a blocking rod is fixedly connected to the bottom of the sliding block, the blocking rod is sleeved in a memory spring, and the blocking rod is symmetrically provided with notches.

[0012] As a further improvement of the technical solution, the guide pipe is connected to a housing, an impeller is arranged in the housing, the impeller is coaxially connected to an output shaft of an auxiliary motor, and the auxiliary motor is fixed on the housing.

[0013] As a further improvement of the technical solution, a tension spring is provided at the end of the adapter box, the tension spring is sleeved on the traction rope, and the two ends of the tension spring are respectively against the adapter box and the cooling ring.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. In the screw pump direct-drive motor, when the memory spring is compressed, the traction rope pulls the baffle to move, so that the air supply pipe and the air supply ring are connected, and the air flow in the air supply pipe is blown to the heat sink through the air supply ring, thereby increasing the cooling range of the direct-drive motor body shell, so that the direct-drive motor body shell can be evenly covered by the air flow, thereby improving the cooling effect.

[0015] 2. In the screw pump direct-drive motor, when the storage ring and the cooling ring are connected, the auxiliary motor can drive the impeller to rotate, and the impeller draws the coolant with low temperature in the storage ring into the cooling ring. The low-temperature coolant in the storage ring is mixed with the high-temperature coolant in the cooling ring, so that the temperature in the cooling ring and the outer casing of the direct-drive motor body is reduced, thereby realizing cyclic cooling of the direct-drive motor body.

[0016] 3. In the screw pump direct drive motor, the airflow can cool down the coolant in the storage ring after flowing through the direct drive motor body, so that it can be mixed with the high-temperature coolant in the cooling ring again when the temperature is high next time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the explosion structure of the cooling ring, the direct drive motor body and the storage ring of the present invention; Figure 3 It is a schematic diagram of the internal structure of the housing body of the present invention in a partial cutaway manner; Figure 4 It is a front view of the cutaway structure of the air supply ring, cooling ring and storage ring of the present invention; Figure 5 This is a schematic diagram of the exploded structure of the guide tube of the present invention; Figure 6 For the present invention Figure 4 A is an enlarged structural diagram; Figure 7 It is a partial schematic diagram of the cutaway structure of the air supply ring, cooling ring and storage ring of the present invention; Figure 8 For the present invention Figure 7 The enlarged structural diagram at B in FIG.

[0018] The meaning of each number in the figure is: 100, direct drive motor body; 110, air supply device; 111, housing body; 112, drive motor; 130, air supply pipe; 131, adapter box; 140, air supply ring; 150, extension spring; 151, traction rope; 152, baffle; 153, slider; 200. Temperature control mechanism; 210, storage ring; 211, cooling ring; 220, memory spring; 221, blocking rod; 222, notch; 230. Guide pipe; 231. Casing; 240. Auxiliary motor; 241. Impeller. DETAILED DESCRIPTION

[0019] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined. Example

[0022] like Figure 1 and Figure 2 As shown, a screw pump direct-drive motor is provided, including a direct-drive motor body 100, an air supply device 110 is arranged above the direct-drive motor body 100, and a plurality of air supply pipes 130 are connected to the bottom of the air supply device 110, and the air supply pipes 130 are used to guide the airflow generated by the air supply device 110 to the outer wall of the direct-drive motor body 100. Under normal conditions, some of the air supply pipes 130 are in a conducting state, and a temperature control mechanism 200 is arranged outside the direct-drive motor body 100. The temperature control mechanism 200 includes a temperature sensing part and a flow guide part. The flow guide part is used to guide the coolant for cooling the direct-drive motor body 100 to the temperature sensing part. When the temperature of the coolant rises, the temperature sensing part opens the ends of the plurality of air supply pipes 130 to achieve cooling of the direct-drive motor body 100, thereby avoiding high temperature of the direct-drive motor body 100 and affecting the normal operation of the direct-drive motor body 100.

[0023] It can be seen from this that when cooling the direct-drive motor body 100, the outer shell of the direct-drive motor body 100 is first cooled by the airflow generated by the air supply device 110. Secondly, after the temperature of the direct-drive motor body 100 continues to rise, the guide part guides the coolant to the temperature sensing part. At this time, the direct-drive motor body 100 is cooled by combining air cooling and coolant. At the same time, the temperature sensing part opens multiple air supply pipes 130, so that the multiple air supply pipes 130 cool different areas of the direct-drive motor body 100, thereby improving the cooling efficiency of the direct-drive motor body 100.

[0024] When the direct-drive motor body 100 just starts to work, that is, when the load of the direct-drive motor body 100 is in a normal state, part of the air supply pipe 130 is opened to cool the direct-drive motor body 100, so that the direct-drive motor body 100 can work at a stable temperature. When the load of the direct-drive motor body 100 increases, the remaining air supply pipes 130 are opened to further improve the cooling effect.

[0025] The specific cooling is as follows: Based on the above structure, combined with Figure 3 and Figure 4 As shown, the structure of the air supply device 110 is disclosed. The air supply device 110 includes a shell body 111 and a drive motor 112 disposed inside the shell body 111. The shell body 111 is fixed to the upper surface of the direct drive motor body 100, and the output shaft of the drive motor 112 is coaxially connected to the fan blades. On the other hand, the ends of the multiple air supply pipes 130 are connected to the air supply ring 140, which is fixedly connected to the outer ring of the direct drive motor body 100, and the bottom of the air supply ring 140 is provided with multiple exhaust holes (the exhaust holes are as shown in FIG. Figure 4 As shown). In this way, when the temperature of the direct-drive motor body 100 rises, the drive motor 112 is started, and the output shaft of the drive motor 112 drives the fan blades to rotate so as to deliver gas to the air supply pipe 130. The gas is delivered to the air supply ring 140 through the air supply pipe 130, and the gas is ejected from the exhaust hole to the heat sink outside the direct-drive motor body 100. At this time, the airflow can accelerate the heat dissipation on the surface of the heat sink, so that the temperature of the direct-drive motor body 100 is maintained at a low level, thereby extending the service life of the direct-drive motor body 100.

[0026] It should be noted that although multiple exhaust holes are opened at the bottom of the air supply ring 140, when the air flow in the air supply pipe 130 is transported to the air supply ring 140, the air flow out of the exhaust holes close to the air supply pipe 130 is greater than the air flow in other exhaust holes (the other exhaust holes refer to the exhaust holes away from the air supply pipe 130).

[0027] Secondly, another cooling method for the direct-drive motor body 100 is liquid cooling. The structure of the guide part is disclosed below. The guide part includes a storage ring 210, and the storage ring 210 is connected to the cooling ring 211 above through a pipeline. The cooling ring 211 is fixedly connected to the air supply ring 140, and the cooling ring 211 is connected to the inside of the shell of the direct-drive motor body 100. The outside of the cooling ring 211 is connected to one end of the guide pipe 230, and the other end of the guide pipe 230 is connected to the storage ring 210, so that the coolant circulates in the shell of the direct-drive motor body 100, the storage ring 210 and the cooling ring 211. Under normal conditions, the shell of the direct-drive motor body 100, the storage ring 210 and the cooling ring 211 are all stored with coolant. In this way, combined with the air cooling method, when the temperature of the shell of the direct-drive motor body 100 increases, the shell of the direct-drive motor body 100 is cooled under the joint action of air cooling and liquid cooling to improve the cooling effect.

[0028] It should be noted that the two ends of the direct drive motor body 100 housing are connected to the cooling ring 211. Figure 2 and Figure 4 shown.

[0029] Return to Figure 4 Combined with Figure 7 As shown, the temperature sensing part includes a memory spring 220, which is in an elongated state under normal conditions and in a compressed state under high temperatures. The spring is made of shape memory alloy gold wire, utilizing the memory effect of the shape memory alloy. The martensite phase (i.e., the phase structure at high temperatures) of the memory spring 220 is a soft phase, and the parent phase (i.e., the phase structure at low temperatures) is a hard phase. The upper end of the memory spring 220 is fixedly connected to a slider 153, and the lower end is fixedly connected to the inner wall of the cooling ring 211. The slider 153 is slidably connected to the cooling ring 211, and the upper surface of the slider 153 is connected to the traction rope 151. When the temperature in the cooling ring 211 rises, at this time, the memory spring 220 changes from an elongated state to a compressed state, and the memory spring 220 pulls the slider 153 to move downward. Similarly, the slider 153 pulls the traction rope 151 to move downward. This process is a compression process. When the temperature of the coolant in the cooling ring 211 decreases, on the contrary, the memory spring 220 changes from a compressed state to a released state.

[0030] At this time, under the effect of air cooling, not only the outer shell of the direct-drive motor body 100 can be cooled, but also the coolant inside the memory spring 220 can be cooled down, which helps to improve the cooling effect of the direct-drive motor body 100.

[0031] During the compression of the memory spring 220, part of the air supply pipe 130 is in an open state and part of it is in a closed state. Figure 6As shown, the end of the traction rope 151 is fixedly connected to the baffle 152, the baffle 152 is slidably connected to the adapter box 131 fixed on the cooling ring 211, and the adapter box 131 is connected to the air supply pipe 130 and the air supply ring 140. Figure 6 Based on and combined with Figure 7 As shown, when the memory spring 220 is compressed, the traction rope 151 pulls the baffle 152 to move, so that the air supply pipe 130 and the air supply ring 140 are connected, and the air flow in the air supply pipe 130 is blown toward the heat sink through the air supply ring 140, thereby increasing the cooling range of the direct-drive motor body 100 casing, so that the direct-drive motor body 100 casing can be evenly covered by the air flow, thereby improving the cooling effect.

[0032] In addition, in order to realize the circulation cooling of the direct drive motor body 100, Figure 7 Based on and combined with Figure 8 As shown, a blocking rod 221 is fixedly connected to the bottom of the slider 153, the blocking rod 221 is sleeved in the memory spring 220, and the blocking rod 221 is symmetrically provided with notches 222. Therefore, when the memory spring 220 is compressed, the slider 153 gradually drives the blocking rod 221 to move downward until the notches 222 on both sides of the blocking rod 221 move into the storage ring 210, and then, at this moment, the storage ring 210 is connected with the cooling ring 211.

[0033] Then, cooperate with Figure 5 As shown, the guide pipe 230 is connected to the housing 231, and the housing 231 is provided with an impeller 241, and the impeller 241 is coaxially connected to the output shaft of the auxiliary motor 240, and the auxiliary motor 240 is fixed on the housing 231. In this way, when the storage ring 210 and the cooling ring 211 are connected, the auxiliary motor 240 can drive the impeller 241 to rotate, and the impeller 241 draws the low-temperature coolant in the storage ring 210 into the cooling ring 211, and the low-temperature coolant in the storage ring 210 is mixed with the high-temperature coolant in the cooling ring 211, so that the temperature of the cooling ring 211 and the housing of the direct-drive motor body 100 is reduced, thereby realizing the circulation cooling of the direct-drive motor body 100.

[0034] Further, returning to Figure 6 and Figure 7As shown, since the end of the adapter box 131 is provided with a tension spring 150, the tension spring 150 is sleeved on the traction rope 151, and the two ends of the tension spring 150 are respectively against the adapter box 131 and the cooling ring 211, under normal conditions, the traction rope 151 and the memory spring 220 are in a balanced state. Therefore, when the memory spring 220 is compressed, the memory spring 220 overcomes the elastic potential energy of the tension spring 150 and drives the slider 153 to move downward. On the contrary, under the elastic action of the traction rope 151 and in accordance with the characteristics of the tension spring 150, the slider 153 moves upward, and the blocking rod 221 restricts the coolant in the cooling ring 211 from flowing into the storage ring 210.

[0035] Finally, when the direct-drive motor body 100 stops working, the airflow passing through the direct-drive motor body 100 can also cool down the coolant in the storage ring 210 so that it can be mixed with the high-temperature coolant in the cooling ring 211 again when the temperature is high next time.

[0036] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A screw pump direct drive motor, comprising a direct drive motor body (100), characterized in that: An air supply device (110) is arranged above the direct-drive motor body (100); the bottom of the air supply device (110) is connected to a plurality of air supply pipes (130); the air supply pipes (130) are used to guide the airflow generated by the air supply device (110) to the outer wall of the direct-drive motor body (100); under normal conditions, some of the air supply pipes (130) are in a conducting state; and a temperature control mechanism (200) is arranged outside the direct-drive motor body (100); the temperature control mechanism (200) comprises a temperature sensing portion and a flow guiding portion; the flow guiding portion is used to guide a cooling liquid for cooling the direct-drive motor body (100) to the temperature sensing portion; and when the temperature of the cooling liquid increases, the temperature sensing portion opens the ends of the plurality of air supply pipes (130) to achieve cooling of the direct-drive motor body (100); The ends of the plurality of air supply pipes (130) are connected to an air supply ring (140), the air supply ring (140) is fixedly connected to the outer ring of the direct drive motor body (100), and a plurality of exhaust holes are provided at the bottom of the air supply ring (140); The guide portion comprises a storage ring (210), the storage ring (210) being connected to an upper cooling ring (211) via a pipeline, the cooling ring (211) being fixedly connected to an air supply ring (140), and the cooling ring (211) being connected to the interior of a housing of a direct-drive motor body (100), the exterior of the cooling ring (211) being connected to one end of a guide pipe (230), and the other end of the guide pipe (230) being connected to the storage ring (210), so that the coolant circulates in the housing of the direct-drive motor body (100), the storage ring (210) and the cooling ring (211); The temperature sensing part comprises a memory spring (220), wherein the memory spring (220) is in an extended state under normal conditions and in a compressed state under high temperature, and the upper end of the memory spring (220) is fixedly connected to a slider (153), and the lower end is fixedly connected to the inner wall of a cooling ring (211), the slider (153) is slidably connected to the cooling ring (211), and the upper surface of the slider (153) is connected to a traction rope (151).

2. The direct drive motor for a screw pump according to claim 1, characterized in that: The air supply device (110) comprises a shell body (111) and a drive motor (112) disposed inside the shell body (111); the shell body (111) is fixed to the upper surface of the direct drive motor body (100); and the output shaft of the drive motor (112) is coaxially connected to the fan blades.

3. The screw pump direct drive motor according to claim 1, characterized in that: The end of the traction rope (151) is fixedly connected to a baffle (152); the adapter box (131) slidably connected to the baffle (152) is fixed on the cooling ring (211); and the adapter box (131) is connected to the air supply pipe (130) and the air supply ring (140).

4. The direct drive motor for a screw pump according to claim 1, characterized in that: A blocking rod (221) is fixedly connected to the bottom of the sliding block (153), the blocking rod (221) is sleeved in the memory spring (220), and the blocking rod (221) is symmetrically provided with notches (222).

5. The direct drive motor for a screw pump according to claim 1, characterized in that: The guide pipe (230) is in communication with a housing (231), an impeller (241) is arranged inside the housing (231), the impeller (241) is coaxially connected to an output shaft of an auxiliary motor (240), and the auxiliary motor (240) is fixed on the housing (231).

6. The direct drive motor for a screw pump according to claim 3, characterized in that: A tension spring (150) is provided at the end of the adapter box (131), the tension spring (150) is sleeved on the traction rope (151), and two ends of the tension spring (150) respectively abut against the adapter box (131) and the cooling ring (211).

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