Motor head assembly

Abstract

The present invention discloses a motor head assembly, including a main body and an anti-backflow device, wherein: the main body includes a first shell and an abutting portion, the first shell is provided with a first through hole, the abutting portion is arranged in the first through hole, the abutting portion is provided with a through fluid channel, and the fluid channel is connected with the first through hole; the anti-backflow device includes an anti-backflow body, the anti-backflow body is movably arranged in the first through hole, the anti-backflow body includes an abutting surface opposite to the first port of the fluid channel and a fluid push surface away from the first port; when the fluid moves along the first direction, the fluid drives the anti-backflow body to separate from the first port through the abutting surface, so that the first port is opened; when the fluid moves along the second direction, the fluid drives the anti-backflow body to contact the first port through the fluid push surface, so that the first port is closed. The above scheme can solve the problem that the anti-backflow structure in the related art uses the spring as the main power source and the motor head assembly is prone to failure.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas field mining equipment, and in particular to a motor head assembly. Background Art

[0002] In oil and gas field mining operations, fluids usually need to be injected into the well through coiled tubing for operation, and the fluid in the well is not allowed to flow back into the coiled tubing, otherwise it is easy to cause safety accidents. In addition, some special operations require pressure operation. In order to ensure the safety of pressure operation and on-site construction, the relevant technology uses a motor head assembly to prevent the fluid in the well from flowing back into the coiled tubing.

[0003] In order to prevent the fluid in the well from flowing back into the continuous oil pipe, the motor head assembly in the related technology adopts a double-plate anti-backflow structure. Each anti-backflow structure usually consists of a valve plate, a valve body, a spring and a rotating shaft. The valve plate rotates around the rotating shaft under the action of the fluid to put the anti-backflow structure in an open state. At this time, the spring is in a stretched state. When the force of the fluid pushing the valve plate to rotate is less than the force of the spring to restore the deformation, the spring drives the valve plate to rotate around the rotating shaft to put the anti-backflow structure in a closed state. Since the main power for the double-plate anti-backflow structure to realize its function comes from the spring, however, during the operation of the continuous oil pipe, the continuous oil pipe will pass corrosive fluid to corrode the anti-backflow structure, or the spring itself will fail due to fatigue, resulting in the problem of functional failure of the anti-backflow structure of the motor head assembly. Summary of the invention

[0004] The invention discloses a motor head assembly to solve the problem that the backflow prevention structure in the related art uses a spring as the main power source and the motor head assembly is prone to failure.

[0005] In order to solve the above-mentioned technical problems, the present invention is achieved as follows:

[0006] The present application discloses a motor head assembly, comprising a main body and a backflow prevention device, wherein:

[0007] The main body includes a first shell and an abutment portion, the first shell is provided with a first through hole, the abutment portion is arranged in the first through hole and is sealed with the inner wall of the first through hole, the abutment portion is provided with a through fluid channel, and the fluid channel is connected with the first through hole;

[0008] The backflow prevention device comprises a backflow prevention body, the backflow prevention body is movably arranged in the first through hole, and the backflow prevention body comprises an abutment surface opposite to the first port of the fluid channel and a fluid push surface facing away from the first port;

[0009] When the fluid moves in the first direction, the fluid drives the backflow prevention body to separate from the first port through the abutment surface, so that the first port is opened;

[0010] When the fluid moves along the second direction, the fluid drives the backflow prevention body to contact the first port through the fluid push surface, so that the first port is closed.

[0011] The technical solution adopted by the present invention can achieve the following technical effects:

[0012] The motor head assembly disclosed in the embodiment of the present application is provided with an abutment portion in the first through hole of the first shell, and is sealed with the inner wall of the first through hole, so that when the fluid moves in the first direction, the fluid drives the anti-backflow body to separate from the first port through the abutment surface, so that the first port is opened, thereby realizing the circulation of the fluid in the motor head assembly along the first direction; when the fluid moves in the second direction, the fluid drives the anti-backflow body to contact the first port through the fluid push surface, so that the first port is closed, thereby blocking the circulation of the fluid in the motor head assembly along the second direction. By adopting the method of using the fluid to drive the anti-backflow body to open or close the first port, the power to drive the anti-backflow body comes from the circulation of the fluid, and the anti-backflow structure in the related art is no longer used, thereby solving the problem that the double-plate anti-backflow structure in the related art uses the spring as the main power source and the motor head assembly is prone to failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of a motor head assembly disclosed in an embodiment of the present invention;

[0014] Figure 2 A schematic diagram of the structure of a first shell disclosed in an embodiment of the present invention;

[0015] Figure 3 A cross-sectional view of a first housing disclosed in an embodiment of the present invention;

[0016] Figure 4 It is a schematic diagram of the structure of the gland disclosed in the embodiment of the present invention;

[0017] Figure 5 It is a structural schematic diagram of the abutment portion disclosed in an embodiment of the present invention;

[0018] Figure 6 A schematic diagram of the structure of a backflow prevention device disclosed in an embodiment of the present invention;

[0019] Figure 7 A schematic diagram of the structure of a guide bracket disclosed in an embodiment of the present invention;

[0020] Figure 8A schematic diagram of the structure of a second housing disclosed in an embodiment of the present invention;

[0021] Fig. 9 It is a schematic diagram of the structure of the shearing piece disclosed in an embodiment of the present invention.

[0022] Description of reference numerals:

[0023] 100-main body, 110-first shell, 111-first through hole, 112-convex key, 120-abutment portion, 121-fluid channel, 130-mounting bracket, 131-extended convex portion, 140-first sealing member,

[0024] 200-backflow prevention device, 210-backflow prevention body, 211-abutment surface, 212-fluid push surface, 220-guide bracket, 221-guide hole, 230-guide support rod, 240-elastic member,

[0025] 300- gland, 310- diversion hole,

[0026] 400-second housing, 410-third through hole, 420-key slot,

[0027] 500- shear parts,

[0028] 600-Rupture disk,

[0029] 700-Second sealing ring,

[0030] 800-third sealing ring,

[0031] 900-Fourth sealing ring. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. 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 making creative work are within the scope of protection of the present invention.

[0033] The technical solutions disclosed in various embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0034] Please refer to Figures 1 to 9 The embodiment of the present invention discloses a motor head assembly, which can be a component of a coiled tubing used in oil and gas field production operations. The disclosed motor head assembly includes a main body 100 and a backflow prevention device 200.

[0035] The main body 100 is the base for installing the various components of the motor head assembly, and the main body 100 includes a first shell 110 and an abutment portion 120. The first shell 110 is provided with a first through hole 111, and the abutment portion 120 is annularly arranged in the first through hole 111 and is sealed and connected to the inner wall of the first through hole 111. The abutment portion 120 can be an annular protrusion formed on the inner wall of the first through hole 111 and sealed and connected to the inner wall.

[0036] The abutting portion 120 is provided with a penetrating fluid channel 121 , which may be a channel surrounded by an annular protrusion and is connected to the first through hole 111 .

[0037] The backflow prevention device 200 includes a backflow prevention body 210, which is movably arranged in the first through hole 111. The backflow prevention body 210 includes an abutment surface 211 opposite to the first port of the fluid channel 121 and a fluid push surface 212 away from the first port. The abutment surface 211 is used to contact or separate from the first port to close or open the first port. The fluid push surface 212 is used to contact the fluid so that the fluid drives the backflow prevention body 210 to contact the first port through the fluid push surface 212. An anti-corrosion layer can be set at the abutment surface 211 and the first port to be suitable for harsh application environments, thereby protecting the abutment surface 211 and the first port.

[0038] When the fluid moves in the first direction, the fluid drives the anti-backflow body 210 to separate from the first port through the abutment surface 211, so that the first port is opened. When the fluid moves in the second direction, the fluid drives the anti-backflow body 210 to collide with the first port through the fluid push surface 212, so that the first port is closed. Specifically, the abutment surface 211 and the fluid push surface 212 can be arranged opposite to each other, and the first direction and the second direction can be opposite. Of course, the abutment surface 211 and the fluid push surface 212 can be arranged in other ways, for example, the abutment surface 211 and the fluid push surface 212 can be arranged in different planes, and the first direction and the second direction can be different planes. The first direction can be the direction in which the side where the abutment surface 211 is located points to the abutment surface 211, and the second direction can be the direction in which the side where the fluid push surface 212 is located points to the fluid push surface 212.

[0039] In a specific implementation process, when the fluid moves along the first direction, the fluid enters the first through hole 111 and the fluid channel 121. When the fluid moves to the abutting surface 211, the fluid drives the backflow prevention body 210 to separate from the first port through the abutting surface 211, so that the first port is opened, and the fluid can pass through the fluid channel 121 and the first through hole 111. When the fluid moves along the second direction, when the fluid moves in the first through hole 111 to the fluid push surface 212, the fluid drives the backflow prevention body 210 to contact the first port through the fluid push surface 212, so that the backflow prevention body 210 blocks the fluid channel 121, and the first port is closed to block the fluid from moving along the second direction.

[0040] The motor head assembly disclosed in the embodiment of the present application is provided with an abutment portion 120 in the first through hole 111 of the first shell 110, and is sealed with the inner wall of the first through hole 111, so that when the fluid moves in the first direction, the fluid drives the anti-backflow body 210 to separate from the first port through the abutment surface 211, so that the first port is opened, thereby realizing the circulation of the fluid in the motor head assembly along the first direction; when the fluid moves in the second direction, the fluid drives the anti-backflow body 210 to contact the first port through the fluid push surface 212, so that the first port is closed, thereby blocking the circulation of the fluid in the motor head assembly along the second direction. By adopting the method of using the fluid to drive the anti-backflow body 210 to open or close the first port, the power to drive the anti-backflow body 210 comes from the circulation of the fluid, and the anti-backflow structure in the related art is no longer used, thereby solving the problem that the double-plate anti-backflow structure in the related art uses the spring as the main power source and the motor head assembly is prone to failure.

[0041] In an optional embodiment, the backflow prevention device 200 may further include a guide bracket 220 and a guide support rod 230, the backflow prevention body 210 may be connected to the guide support rod 230, the guide bracket 220 may be connected to the main body 100, the guide bracket 220 may be provided with a guide hole 221, the end of the guide support rod 230 that is away from the backflow prevention body 210 may be inserted into the guide hole 221, and the guide support rod 230 may be guided and matched with the guide hole 221 to separate or conflict the backflow prevention body 210 from the first port. The guide bracket 220 may be provided with a plurality of bracket channels that are connected to the first through hole 111, so that the fluid passes through the guide bracket 220.

[0042] In the embodiment of the present application, a guide bracket 220 and a guide support rod 230 are set, the backflow prevention body 210 is connected to the guide support rod 230, the guide bracket 220 can be connected to the main body 100, and the guide bracket 220 is provided with a guide hole 221, so that the end of the guide support rod 230 that is away from the backflow prevention body 210 is inserted into the guide hole 221, and the guide support rod 230 can cooperate with the guide hole 221 to guide the backflow prevention body 210 to separate or contact the first port, thereby making the movement of the backflow prevention body 210 more accurate when separating or contacting the first port.

[0043] In order to facilitate the installation of the backflow prevention device 200 and the main body 100, the main body 100 may further include a mounting bracket 130, the mounting bracket 130 may be provided with an abutment portion 120, the inner wall of the first through hole 111 may be provided with a first internal thread, the mounting bracket 130 may be provided with a first external thread and a second internal thread, the guide bracket 220 may be provided with a second external thread, the mounting bracket 130 may be detachably mounted on the first through hole 111 by threading cooperation between the first external thread and the first internal thread, and the guide bracket 220 may be detachably mounted on the mounting bracket 130 by threading cooperation between the second external thread and the second internal thread. A third sealing ring 800 may be provided at the connection between the mounting bracket 130 and the inner wall of the first through hole 111. The mounting bracket 130 and the guide bracket 220 may clamp the abutment portion 120 to fix the abutment portion 120. A second sealing ring 700 may be provided at the connection between the mounting bracket 130 and the abutment portion 120.

[0044] The present application sets a mounting bracket 130, so that when the anti-backflow device 200 and the main body 100 are installed, the guide bracket 220 can be detachably mounted on the mounting bracket 130 through the threaded cooperation of the second external thread and the second internal thread, and at the same time, when the guide bracket 220 and the mounting bracket 130 are installed, the guide support rod 230 and the anti-backflow body 210 are installed together, so that the guide support rod 230, the anti-backflow body 210, the guide bracket 220 and the mounting bracket 130 are connected as a whole, and then the mounting bracket 130 is detachably mounted on the first through hole 111 through the threaded cooperation of the first external thread and the first internal thread, so that the installation of the anti-backflow device 200 and the main body 100 is more convenient.

[0045] In some embodiments, the guide bracket 220 and the mounting bracket 130 can be detachably connected by a bayonet snap-on connection, and the mounting bracket 130 can also be detachably mounted on the first through hole 111 by a bayonet snap-on connection. The present application does not impose any specific restrictions on the connection method between the guide bracket 220 and the mounting bracket 130, and the connection method between the mounting bracket 130 and the inner wall of the first through hole 111.

[0046] In order to protect the contact position between the abutment portion 120 and the backflow prevention body 210, the mounting bracket 130 may optionally include an extension convex portion 131, which may be connected to the abutment portion 120, and which may be arranged around the abutment portion 120, and which may be arranged around the first port of the fluid channel 121, and which may include a second internal thread. By providing the extension convex portion 131, the extension convex portion 131 may protect the first port of the fluid channel 121, and further the contact position between the abutment portion 120 and the backflow prevention body 210.

[0047] In some application environments, in order to meet working requirements, the continuous oil pipe needs to filter larger impurities when conveying fluid. The size of the impurities may refer to the volume of the impurities. In order to filter larger impurities, the motor head assembly may optionally include a gland 300. The gland 300 may be mounted on the mounting bracket 130 and located at the second port of the fluid channel 121. The first port and the second port may be arranged opposite to each other. The gland 300 may be provided with a plurality of flow diversion holes 310 arranged at intervals and passing through the gland 300. The plurality of flow diversion holes 310 may be connected to the fluid channel 121. Under the condition of ensuring the fluid flow rate, the gland 300 is provided with a plurality of flow diversion holes 310 arranged at intervals and passing through the gland 300. Compared with only one larger hole, the size of each flow diversion hole 310 is relatively small, so that larger impurities can be better filtered.

[0048] To facilitate installation of the gland 300, optionally, the gland 300 may be provided with a third external thread, and the mounting bracket 130 may be provided with a third internal thread, and the gland 300 may be detachably connected to the mounting bracket 130 through the threaded cooperation of the third external thread and the third internal thread. By connecting the gland 300 and the mounting bracket 130 through threads, not only is the connection relationship stable, but also the gland 300 can be connected to the mounting bracket 130 and then connected to the first housing 110 through the mounting bracket 130, thereby facilitating installation of the gland 300 and the main body 100.

[0049] In order to make the anti-backflow body 210 better block the first port when the anti-backflow body 210 conflicts with the first port, optionally, the first port can be an arc-shaped concave surface, and the abutting surface can be an arc-shaped convex surface that matches the shape of the arc-shaped concave surface. By making the first port an arc-shaped concave surface, and the abutting surface an arc-shaped convex surface that matches the shape of the arc-shaped concave surface, the anti-backflow body 210 can better block the first port when the anti-backflow body 210 conflicts with the first port.

[0050] In an optional embodiment, the backflow prevention device 200 may include an elastic member 240, which may be connected between the main body 100 and the backflow prevention body 210, and may be used to drive the backflow prevention body 210 to contact the first port. The elastic member 240 may be a coil spring.

[0051] Specifically, when there is no fluid passing through the motor head assembly, the elastic member 240 can drive the anti-backflow body 210 to contact the first port, so that when the fluid moves along the second direction, when the fluid impacts the anti-backflow body 210, the problem of damage caused by the impact of the anti-backflow body 210 and the first port is avoided, and the elastic member 240 can better play a buffering role when the fluid impacts the anti-backflow body 210, thereby protecting the protective member body 210. When the fluid moves along the second direction, the fluid and the elastic member 240 work together to drive the anti-backflow body 210 to contact the first port, thereby further preventing the fluid from passing through the first port along the second direction. The force of the elastic member 240 driving the anti-backflow body 210 to contact the first port can be small, so that the fluid can easily overcome the elastic force of the elastic member 240 to open the first port when moving along the first direction.

[0052] In some embodiments, by setting different elastic members 240 , the pressure threshold for opening the first port when the fluid flows in the first direction can be adjusted, so that the design can be performed according to actual application scenarios to meet different requirements.

[0053] In some application scenarios, for example, when the motor head assembly is used for a coiled tubing, the portion of the coiled tubing located underground may be stuck and unable to be recovered. In order to ensure that most of the coiled tubing can be recovered, a portion of the underground needs to be disconnected to ensure normal recovery of the coiled tubing. In order to ensure normal recovery of the coiled tubing, the motor head assembly may optionally include a second housing 400 and a shear member 500. The second housing 400 and the backflow prevention device 200 may be located on the same side of the first port. The second housing 400 may be provided with a third through hole 410 extending therethrough. The first end of the second housing 400 may be connected to the first end of the first housing 110 through the shear member 500. The first through hole 111 and the third through hole 410 may be connected.

[0054] In the embodiment of the present application, the first end of the second shell 400 can be connected to the first end of the first shell 110 through the shear piece 500, so that when the shear force between the second shell 400 and the first shell 110 is greater than the strength of the shear piece 500 itself, the shear piece 500 is damaged and the first shell 110 and the second shell 400 can be separated, thereby solving the problem of the continuous oil tubing getting stuck and being unable to be recovered when the motor head assembly is used for the continuous oil tubing.

[0055] In an optional implementation, the first end of the second shell 400 may be provided with a step structure, the second end of the second shell 400 may extend in a direction away from the first shell 110, the first end of the second shell 400 may be sleeved on the first end of the first shell 110, the second end of the first shell 110 may extend along a side away from the second shell 400, the first end of the first shell 110 may be aligned with the first port, and the second end of the first shell 110 may be aligned with the second port. The first end of the first shell 110 may be provided with a mounting groove, the shearing piece 500 may be disposed in the mounting groove and at least partially extend out of the notch of the mounting groove, and the shearing piece 500 may be in position-limiting contact with the end face of the step structure to limit the separation of the first shell 110 from the second shell 400. The first end of the second housing 400 is provided with a step structure, the first end of the first housing 110 is provided with a mounting groove, and the shearing piece 500 is provided in the mounting groove, so that when the first end of the second housing 400 is sleeved on the first end of the first housing 110, the shearing piece 500 can be in position-limiting contact with the end surface of the step structure, thereby limiting the separation of the first housing 110 from the second housing 400. A fourth sealing ring 900 can be provided at the connection between the first end of the second housing 400 and the first end of the first housing 110, and the fourth sealing ring 900 is sealingly connected to the connection between the first end of the second housing 400 and the first end of the first housing 110.

[0056] Optionally, the first end of the second shell 400 may be provided with a plurality of spaced key slots 420, and the first end of the first shell 110 may be provided with a plurality of spaced convex keys 112, and the plurality of key slots 420 and the plurality of convex keys 112 may be plugged in and matched. By providing a plurality of spaced key slots 420 at the first end of the second shell 400 and providing a plurality of spaced convex keys 112 at the first end of the first shell 110, the second shell 400 and the first shell 110 are connected by plugging in and matching the plurality of key slots 420 and the plurality of convex keys 112, so that the connection between the second shell 400 and the first shell 110 is more stable, and rotation around the central axis of the first through hole 111 can be avoided.

[0057] In an optional embodiment, the motor head assembly may further include a rupture disk 600, which may be disposed on the second housing 400. When the coiled tubing is stuck, a high-pressure fluid in the second direction may be introduced first, and the anti-backflow device 200 blocks the first through hole 111. At this time, the pressure in the second housing 400 rises sharply until the rupture disk 600 opens. At this time, the high-pressure fluid may push away nearby buried objects through the opening at the rupture disk, so as to facilitate the recovery of the coiled tubing without damaging the shear member 500.

[0058] In an optional embodiment, the abutting portion 120 may be provided with a first sealing member 140, which may be arranged around the inner port of the first port, and when the fluid drives the anti-backflow body 210 to collide with the first port through the fluid push surface 212, the first sealing member 140 may be sealed and connected between the first port and the anti-backflow body 210. By providing the first sealing member 140, when the fluid drives the anti-backflow body 210 to collide with the first port through the fluid push surface 212, the first sealing member 140 may be sealed and connected between the first port and the anti-backflow body 210, so that the anti-backflow body 210 can better block the first port.

[0059] The above embodiments of the present invention focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0060] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.

Claims

1. A motor head assembly, characterized in that: It comprises a main body (100), a backflow prevention device (200) and a gland (300), wherein: The main body (100) comprises a first shell (110) and an abutment portion (120); the first shell (110) is provided with a first through hole (111) extending therethrough; the abutment portion (120) is arranged in an annular manner inside the first through hole (111) and is sealedly connected to the inner wall of the first through hole (111); the abutment portion (120) is provided with a fluid passage (121) extending therethrough; and the fluid passage (121) is connected to the first through hole (111); The backflow prevention device (200) comprises a backflow prevention body (210), the backflow prevention body (210) being movably disposed in the first through hole (111), the backflow prevention body (210) comprising an abutment surface (211) opposite to the first port of the fluid channel (121) and a fluid push surface (212) facing away from the first port; When the fluid moves along the first direction, the fluid drives the backflow prevention body (210) to separate from the first port through the abutment surface (211), so that the first port is opened; When the fluid moves along the second direction, the fluid drives the backflow prevention body (210) to contact the first port through the fluid push surface (212), so that the first port is closed; The main body (100) comprises a mounting bracket (130), the mounting bracket (130) is provided with the abutting portion (120), the inner wall of the first through hole (111) is provided with a first internal thread, the mounting bracket (130) is provided with a first external thread, and the mounting bracket (130) is detachably mounted on the first through hole (111) through threaded cooperation between the first external thread and the first internal thread; The gland (300) is mounted on the mounting bracket (130) and is located at the second port of the fluid channel (121), the first port and the second port being arranged opposite to each other, the gland (300) is provided with a plurality of flow diversion holes (310) which are arranged at intervals and pass through the gland (300), and the plurality of flow diversion holes (310) are connected to the fluid channel (121).

2. The motor head assembly according to claim 1, characterized in that: The backflow prevention device (200) further comprises a guide bracket (220) and a guide support rod (230), the backflow prevention body (210) being connected to the guide support rod (230), the guide bracket (220) being connected to the main body (100), the guide bracket (220) being provided with a guide hole (221), an end of the guide support rod (230) facing away from the backflow prevention body (210) being passed through the guide hole (221), and the guide support rod (230) being guided and matched with the guide hole (221) so that the backflow prevention body (210) is separated from or in contact with the first port.

3. The motor head assembly according to claim 2, characterized in that: The mounting bracket (130) is provided with a second internal thread, the guide bracket (220) is provided with a second external thread, and the guide bracket (220) is detachably mounted on the mounting bracket (130) through thread cooperation between the second external thread and the second internal thread.

4. The motor head assembly according to claim 3, characterized in that: The mounting bracket (130) comprises an extending protrusion (131), the extending protrusion (131) is connected to the abutting portion (120), and the extending protrusion (131) is arranged around the abutting portion (120), and the extending protrusion (131) comprises the second internal thread.

5. The motor head assembly according to claim 1, characterized in that: The gland (300) is provided with a third external thread, the mounting bracket (130) is provided with a third internal thread, and the gland (300) is detachably connected to the mounting bracket (130) through threaded cooperation between the third external thread and the third internal thread.

6. The motor head assembly according to claim 1, characterized in that: The first port is an arc-shaped concave surface, and the abutting surface is an arc-shaped convex surface that matches the shape of the arc-shaped concave surface.

7. The motor head assembly according to claim 1, characterized in that: The backflow prevention device (200) comprises an elastic member (240), wherein the elastic member (240) is connected between the main body (100) and the backflow prevention body (210), and the elastic member (240) is used to drive the backflow prevention body (210) to contact the first port.

8. The motor head assembly according to claim 1, characterized in that: The motor head assembly further comprises a second shell (400) and a shear piece (500); the second shell (400) and the backflow prevention device (200) are both located on the same side of the first port; the second shell (400) is provided with a third through hole (410) extending therethrough; the first end of the second shell (400) is connected to the first end of the first shell (110) via the shear piece (500); and the first through hole (111) and the third through hole (410) are connected to each other.

9. The motor head assembly according to claim 8, characterized in that: A step structure is provided at the first end of the second shell (400), and the first end of the second shell (400) is sleeved on the first end of the first shell (110). A mounting groove is provided at the first end of the first shell (110). The shearing piece (500) is provided in the mounting groove and at least partially extends out of the notch of the mounting groove. The shearing piece (500) is in limited contact with the end surface of the step structure to limit the separation of the first shell (110) and the second shell (400).

10. The motor head assembly according to claim 9, characterized in that: The first end of the second shell (400) is provided with a plurality of spaced keyways (420), and the first end of the first shell (110) is provided with a plurality of spaced convex keys (112), and the plurality of keyways (420) and the plurality of convex keys (112) are plug-fitted.

11. The motor head assembly according to claim 8, characterized in that: The motor head assembly further comprises a rupture disk (600), wherein the rupture disk (600) is arranged on the second housing (400).

12. The motor head assembly according to claim 1, characterized in that: The abutting portion (120) is provided with a first sealing member (140), and the first sealing member (140) is arranged around the inner port of the first port. When the fluid drives the backflow prevention body (210) to abut against the first port through the fluid push surface (212), the first sealing member (140) is sealed and connected between the first port and the backflow prevention body (210).

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