Dynamic sealing structure of downhole double-actuator giant magnetostrictive transducer

Abstract

The application relates to a dynamic sealing structure of a downhole double-actuator giant magnetostrictive transducer, which dynamically seals the output rod of the giant magnetostrictive actuator from two aspects. One aspect is to prevent water from entering, rubber sleeves capable of fitting the output rod and the connecting ring in shape are arranged at both ends of the central through hole of the connecting ring, and a suitable adhesive is selected to bond the rubber sleeves on the output rod and the connecting ring, and the elastic rubber sleeves are used for dynamically sealing the output rod in axial reciprocating motion. Secondly, O-ring grooves are designed on the side wall of the central through hole of the connecting ring and the output rod, and the O-rings are respectively arranged in the grooves on the side wall of the central through hole of the connecting ring and the output rod in the form of being embedded or sleeved, and the O-rings are compressed and deformed through interference fit with the contact surfaces of the output rod and the connecting ring to prevent water from entering. The other aspect is water storage, the upper connecting ring and the lower connecting ring are manufactured by using a metal 3D printing technology, and the entering water is guided to the water storage groove through the drainage groove and the funnel-shaped drainage channel structure in the connecting ring.

Description

Technical Field

[0001] This invention relates to a dynamic sealing structure for a downhole dual-actuator super magnetostrictive transducer, belonging to the technical field of super magnetostrictive transducers. Background Technology

[0002] O-rings are widely used in downhole instruments due to their reliable function, cost-effectiveness, and ease of installation. Under zero differential pressure, the O-ring seal relies on the interference fit between the O-ring and the sealing surface during assembly, which generates compression deformation and creates an initial contact pressure. This initial contact pressure must be large enough to fully fill the tiny irregularities in the sealing surface with sealing material. The compression deformation of the O-ring at this point can be expressed as its compressibility ratio.

[0003] In downhole instrument applications, O-rings are typically exposed to various fluids such as water, acid, nitrogen, oil, natural gas, hydrogen sulfide, and carbon dioxide. Therefore, O-rings must possess corrosion resistance under these downhole fluid conditions. Furthermore, the materials of most O-rings soften with increasing temperature; the impact of temperature on the sealing performance and compression resistance of O-rings must also be considered.

[0004] Regardless of whether the O-ring is external or internal, it will inevitably experience wear and aging due to the continuous axial reciprocating motion of the output rod and the complex fluid environment downhole. Therefore, after a period of dynamic sealing at the output rod using O-rings, a small amount of water will inevitably seep in. Even using a suitable adhesive to bond a rubber sleeve that conforms to the shape of the output rod and the connecting ring may result in a decrease in sealing effectiveness over time due to the high downhole temperature and complex fluid environment. Since removing the transducer is costly, it is generally not done easily, making it difficult to drain the small amount of water that has seeped in promptly. However, by using metal 3D printing technology to design a special structure, this seeped water can be temporarily stored in a specific location inside the connecting ring. Summary of the Invention

[0005] This invention addresses the following technical problems: It solves the dynamic sealing problem at the output rod by using rubber sleeves at both ends of the central through-hole of the connecting ring, whose shape conforms to the output rod and connecting ring. A suitable adhesive is used to bond the rubber sleeves to the output rod and connecting ring. When the output rod reciprocates axially, the rubber sleeves undergo elastic deformation, maintaining a sealing function even during this elastic deformation. O-ring grooves are designed on the sidewall of the central through-hole of the connecting ring and on the output rod, allowing the O-rings to be installed either internally or externally on the sidewall of the central through-hole of the connecting ring and on the output rod, respectively. The interference fit between the O-rings and the contact surfaces of the output rod and connecting ring generates compression deformation to prevent water ingress. Furthermore, it solves the problem of decreased sealing performance and difficulty in timely drainage of small amounts of water after wear and aging of the rubber sleeves and O-rings by using metal 3D printing technology to design a drainage groove and funnel-shaped drainage channel structure on the connecting ring, guiding the infiltrated water to a storage tank inside the connecting ring for temporary storage.

[0006] The technical solution of this invention is a dynamic sealing structure for a downhole dual-actuator magnetostrictive transducer, comprising an upper actuator, a connecting rod, a radiator, and a lower actuator. The upper actuator is connected to the top end of the connecting rod via an upper connecting ring, and the lower actuator is connected to the bottom end of the connecting rod via a lower connecting ring. The radiator is installed inside the connecting rod, with its top end connected to the upper output rod of the upper actuator, which passes through the central through-hole of the upper connecting ring, and its bottom end connected to the lower output rod of the lower actuator, which passes through the central through-hole of the lower connecting ring.

[0007] The upper actuator consists of an upper driver, an upper actuator outer sleeve, an upper connecting ring, an upper output rod, a first rubber sleeve of the upper actuator, a second rubber sleeve of the upper actuator, an outer O-ring of the upper output rod, and an inner O-ring of the upper connecting ring. The upper driver refers to the driving unit of the upper actuator, which contains a magnetic circuit structure with a driving magnetic field and a bias magnetic field, and can complete the conversion of electrical energy to magnetic energy to mechanical energy. The upper actuator outer sleeve encloses the upper driver, and the bottom center of the upper driver is directly connected to the upper output rod. When the transducer is working, the upper driver transmits the driving force to the top of the radiator through the upper output rod. The bottom sidewall of the upper actuator outer sleeve connects to the top sidewall of the upper connecting ring. The central axis of the upper connecting ring has a through-hole structure at both ends. The upper output rod passes through the central through-hole of the upper connecting ring and connects to the top of the radiator. The first rubber sleeve of the upper actuator is installed at the position where the upper output rod exits the central through-hole of the upper connecting ring, and the second rubber sleeve of the upper actuator is installed at the position where the upper output rod enters the central through-hole of the upper connecting ring. The shapes of the first and second rubber sleeves of the upper actuator can fit the upper output rod and the upper connecting ring. A suitable adhesive is used to bond the first and second rubber sleeves of the upper actuator to the contact surfaces with the upper output rod and the upper connecting ring. The outer O-ring of the upper output rod is installed in the O-ring groove of the upper output rod. The O-ring groove of the upper output rod is an O-ring groove cut from the round rod structure of the upper output rod. The embedded O-ring of the upper connecting ring is installed in the O-ring groove of the upper connecting ring. The O-ring groove of the upper connecting ring is the O-ring groove on the side wall of the central through hole of the upper connecting ring.

[0008] The structural features of the upper connecting ring include a flow channel, a funnel-shaped drainage channel, a water storage tank, and an O-ring embedded groove. The flow channel is located on the side wall of the central through-hole of the upper connecting ring. After the upper actuator is assembled, the flow channel is below the O-ring embedded groove and above the O-ring outer groove of the upper output rod, i.e., below the embedded O-ring and above the outer O-ring of the upper output rod. Both the outer O-ring of the upper output rod and the embedded O-ring of the upper connecting ring will undergo compression deformation under the pressure of the upper output rod and the side wall of the central through-hole of the upper connecting ring. The funnel-shaped drainage channel of the upper connecting ring has a funnel structure that is wider at the top and narrower at the bottom. The wide opening is the inlet, communicating with the flow channel of the upper connecting ring, and the narrow opening is the outlet, communicating with the water storage tank of the upper connecting ring. Downhole fluid that breaks through the first rubber sleeve of the upper actuator and the outer O-ring of the upper output rod will flow from the drainage groove of the upper connecting ring into the funnel-shaped drainage channel of the upper connecting ring, and then flow through the funnel-shaped drainage channel into the water storage tank of the upper connecting ring for temporary storage. The O-ring embedding groove of the upper connecting ring is also located on the side wall of the central through-hole of the upper connecting ring. The embedded O-ring of the upper connecting ring is installed in the O-ring embedding groove of the upper connecting ring. Downhole fluid that returns after being blocked by the second rubber sleeve of the upper actuator and the embedded O-ring of the upper connecting ring will also flow sequentially through the drainage groove and the funnel-shaped drainage channel of the upper connecting ring, and enter the water storage tank of the upper connecting ring for temporary storage.

[0009] The inner diameter of the central through hole of the first rubber sleeve of the upper actuator and the inner diameter of the central through hole of the second rubber sleeve of the upper actuator are both smaller than the diameter of the upper output rod.

[0010] The lower actuator consists of a lower driver, a lower actuator outer sleeve, a lower connecting ring, a lower output rod, a first rubber sleeve of the lower actuator, a second rubber sleeve of the lower actuator, an outer O-ring of the lower output rod, and an inner O-ring of the lower connecting ring. The lower driver refers to the driving unit of the lower actuator, which contains a magnetic circuit structure with a driving magnetic field and a bias magnetic field, and can complete the conversion of electrical energy to magnetic energy to mechanical energy. The lower actuator outer sleeve encloses the lower driver, and the top center of the lower driver is directly connected to the lower output rod. When the transducer is working, the lower driver transmits the driving force to the bottom end of the radiator through the lower output rod. The top sidewall of the lower actuator outer sleeve connects to the bottom sidewall of the lower connecting ring. The central axis of the lower connecting ring has a through-hole structure at both ends. The lower output rod passes through the central through-hole of the lower connecting ring and connects to the bottom of the radiator. The first rubber sleeve of the lower actuator is installed at the position where the lower output rod exits the central through-hole of the lower connecting ring, and the second rubber sleeve of the lower actuator is installed at the position where the lower output rod enters the central through-hole of the lower connecting ring. The shapes of the first and second rubber sleeves of the lower actuator can fit the lower output rod and the lower connecting ring. A suitable adhesive is used to bond the first and second rubber sleeves of the lower actuator to the contact surfaces with the lower output rod and the lower connecting ring. The outer O-ring of the lower output rod is installed in the O-ring groove of the lower output rod. The O-ring groove of the lower output rod is an O-ring groove cut from the round rod structure of the lower output rod. The embedded O-ring of the lower connecting ring is installed in the O-ring groove of the lower connecting ring. The O-ring groove of the lower connecting ring is the O-ring groove on the side wall of the central through hole of the lower connecting ring.

[0011] The structural features of the lower connecting ring include a flow channel, a funnel-shaped drainage channel, a water storage tank, and an O-ring embedded groove. The flow channel is located on the side wall of the central through-hole of the lower connecting ring. After the lower actuator is assembled, the flow channel is above the O-ring embedded groove and below the O-ring outer groove of the lower output rod, i.e., above the embedded O-ring and below the outer O-ring of the lower output rod. Both the outer O-ring of the lower output rod and the embedded O-ring of the lower connecting ring will undergo compression deformation under the pressure of the lower output rod and the side wall of the central through-hole of the lower connecting ring. The funnel-shaped drainage channel of the lower connecting ring has a funnel structure that is wider at the top and narrower at the bottom. The wide opening is the inlet, communicating with the flow channel of the lower connecting ring, and the narrow opening is the outlet, communicating with the water storage tank of the lower connecting ring. Downhole fluid that breaks through the first rubber sleeve of the lower actuator and the outer O-ring of the lower output rod will flow from the drainage groove of the lower connecting ring into the funnel-shaped drainage channel of the lower connecting ring, and then flow through the funnel-shaped drainage channel into the water storage tank of the lower connecting ring for temporary storage. The O-ring embedding groove of the lower connecting ring is also located on the side wall of the central through-hole of the lower connecting ring. The embedded O-ring of the lower connecting ring is installed in the O-ring embedding groove of the lower connecting ring. Downhole fluid that returns after being blocked by the second rubber sleeve of the lower actuator and the embedded O-ring of the lower connecting ring will also flow sequentially through the drainage groove and the funnel-shaped drainage channel of the lower connecting ring, and enter the water storage tank of the lower connecting ring for temporary storage.

[0012] The inner diameter of the central through hole of the first rubber sleeve of the lower actuator and the inner diameter of the central through hole of the second rubber sleeve of the lower actuator are both smaller than the diameter of the lower output rod.

[0013] Both the upper and lower connecting rings are manufactured using metal 3D printing technology.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] (1) This invention solves the dynamic sealing problem at the output rod. Rubber sleeves with shapes that fit the output rod and the connecting ring are used at both ends of the central through-hole of the connecting ring. A suitable adhesive is used to bond the rubber sleeves to the output rod and the connecting ring. When the output rod makes axial reciprocating motion, the rubber sleeves will undergo elastic deformation along with the output rod. While undergoing elastic deformation, the rubber sleeves still provide a sealing function. O-ring grooves are designed on the sidewalls of the central through-hole of the output rod and the connecting ring, allowing the O-rings to be installed on the output rod as outer sleeves and on the sidewalls of the central through-hole of the connecting ring as inner sleeves. The interference fit between the O-rings and the sidewalls of the central through-hole of the output rod and the connecting ring generates compression deformation to prevent water ingress. This invention integrates traditional methods such as O-rings, rubber sleeves, and rubber-metal adhesives to prevent water ingress, achieving multiple layers of sealing and providing relative reliability.

[0016] (2) This invention addresses the issue of small amounts of water seeping in after the sealing effect of the rubber sleeve and O-ring deteriorates and is difficult to drain in a timely manner. It utilizes metal 3D printing technology to design a drainage groove and funnel-shaped drainage channel structure on the connector ring to guide the seeping water to a water storage tank inside the connector ring for temporary storage. This water storage aspect leverages the emerging technology of metal 3D printing to design structures that cannot be fabricated using traditional methods, adding an extra layer of protection for the stable operation of the transducer. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2A This is a schematic diagram of the assembly of the upper actuator;

[0019] Figure 2B This is a schematic diagram of the lower actuator assembly;

[0020] Figure 3A This is a schematic diagram of the upper connecting ring;

[0021] Figure 3B This is a schematic diagram of the lower connecting ring;

[0022] Figure 4A This is a schematic diagram showing the position of some of the rubber sleeves in this invention;

[0023] Figure 4B This is a schematic diagram showing the positions of the remaining rubber sleeves in this invention;

[0024] Figure 5A This is a schematic diagram of the assembly of the outer O-ring of the upper output rod in this invention;

[0025] Figure 5B This is a schematic diagram of the assembly of the outer O-ring of the lower output rod in this invention;

[0026] Figure 6A This is a schematic diagram of the assembly of the embedded O-ring of the upper connecting ring in this invention;

[0027] Figure 6B This is a schematic diagram of the assembly of the embedded O-ring of the lower connecting ring in this invention.

[0028] In the diagram, 1-upper actuator, 1-1-upper driver, 1-2-upper actuator outer sleeve, 1-3-upper connecting ring, 1-3-a-drainage groove of upper connecting ring, 1-3-b-funnel-shaped drainage channel of upper connecting ring, 1-3-c-water storage tank of upper connecting ring, 1-3-d-O-ring embedded groove of upper connecting ring, 1-4-upper output rod, 1-4-a-O-ring outer groove of upper output rod, 1-5-first rubber sleeve of upper actuator, 1-6-second rubber sleeve of upper actuator, 1-7-outer O-ring of upper output rod, 1-8-embedded O-ring of upper connecting ring, 2-connector Rod, 3-Radiator, 4-Lower Actuator, 4-1-Lower Driver, 4-2-Lower Actuator Outer Sleeve, 4-3-Lower Connecting Ring, 4-3-a-Drainage Groove of Lower Connecting Ring, 4-3-b-Funnel-shaped Drainage Channel of Lower Connecting Ring, 4-3-c-Water Storage Tank of Lower Connecting Ring, 4-3-d-O-ring Embedded Groove of Lower Connecting Ring, 4-4-Lower Output Rod, 4-4-a-O-ring Outer Groove of Lower Output Rod, 4-5-First Rubber Sleeve of Lower Actuator, 4-6-Second Rubber Sleeve of Lower Actuator, 4-7-Outer O-ring of Lower Output Rod, 4-8-Embedded O-ring of Lower Connecting Ring. Detailed Implementation

[0029] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] like Figure 1 As shown, the dynamic sealing structure of the dual-actuator magnetostrictive transducer of this invention consists of an upper actuator 1, a connecting rod 2, a radiator 3, and a lower actuator 4. The upper actuator 1 is connected to the top of the connecting rod 2 via an upper connecting ring 1-3, and the lower actuator 4 is connected to the bottom of the connecting rod 2 via a lower connecting ring 4-3. The radiator 3 is installed inside the connecting rod 2. The top of the radiator 3 is connected to the upper output rod 1-4 in the upper actuator 1, which passes through the central through-hole of the upper connecting ring 1-3, and the bottom of the radiator 3 is connected to the lower output rod 4-4 in the lower actuator 4, which passes through the central through-hole of the lower connecting ring 4-3. When the transducer is working, the output phases of the two magnetostrictive actuators can be synchronized by controlling the input current signal, thereby ensuring that both ends of the radiator 3 contract and expand simultaneously, achieving the effect of increasing the output power of the transducer.

[0031] When the transducer is working, the upper output rod 1-4 will reciprocate axially. Without a suitable dynamic sealing measure, the high downhole pressure will force fluid to enter the upper actuator 1 through the gap between the upper output rod 1-4 and the central through hole of the upper connecting ring 1-3, thus causing device failure. In order to reduce the risk of water ingress into the upper actuator 1, the present invention first uses rubber sleeves at both ends of the central through hole of the upper connecting ring 1-3, the shape of which can fit the upper output rod 1-4 and the upper connecting ring 1-3, and uses a suitable adhesive to bond the rubber sleeves to the upper output rod 1-4 and the upper connecting ring 1-3. When the upper output rod 1-4 reciprocates axially, the first rubber sleeve 1-5 and the second rubber sleeve 1-6 of the upper actuator will undergo elastic deformation with the upper output rod 1-4, and the elasticity of the rubber sleeves will provide a dynamic seal for the upper output rod 1-4 during axial reciprocating motion. Secondly, O-rings are installed in the inner groove 1-3-d of the upper connecting ring and the outer groove 1-4-a of the upper output rod. The O-rings undergo compression deformation through an interference fit with the contact surfaces of the upper connecting ring 1-3 and the upper output rod 1-4, thus creating initial contact pressure at the sealing contact surfaces. This initial contact pressure causes the O-rings to fill the gap between the side wall of the central through hole of the upper connecting ring 1-3 and the upper output rod 1-4, achieving a dynamic seal. Considering the high downhole temperature, the rubber sleeve and O-ring will soften as the temperature rises, and the axial reciprocating motion of the output rod will cause a certain degree of wear and aging of the O-rings. Therefore, after using the rubber sleeve and O-rings to dynamically seal the output rod for a period of time, a small amount of water seepage is inevitable. This invention utilizes metal 3D printing technology to manufacture the upper connecting ring 1-3. The structural features of the upper connecting ring 1-3 include a drainage groove 1-3-a, a funnel-shaped drainage channel 1-3-b, a water storage tank 1-3-c, and an O-ring embedded groove 1-3-d. The drainage groove 1-3-a is located on the side wall of the central through hole of the upper connecting ring 1-3. After the upper actuator 1 is assembled, the drainage groove 1-3-a is below the O-ring embedded groove 1-3-d and above the O-ring outer groove 1-4-a of the upper output rod, that is, below the inner O-ring 1-8 of the upper connecting ring and above the outer O-ring 1-7 of the upper output rod. Both the inner O-ring 1-8 and the outer O-ring 1-7 of the upper connecting ring will undergo compressive deformation under the pressure of the upper output rod 1-4 and the side wall of the central through hole of the upper connecting ring 1-3. The funnel-shaped drainage channel 1-3-b of the upper connecting ring has a funnel structure that is wider at the top and narrower at the bottom. The wide opening is the water inlet, which communicates with the diversion channel 1-3-a of the upper connecting ring, and the narrow opening is the water outlet, which communicates with the water storage tank 1-3-c of the upper connecting ring. The downhole fluid that breaks through the first rubber sleeve 1-5 of the upper actuator and the outer O-ring 1-7 of the upper output rod will flow from the diversion channel 1-3-a of the upper connecting ring into the funnel-shaped drainage channel 1-3-b of the upper connecting ring, and then flow through the funnel-shaped drainage channel 1-3-b of the upper connecting ring into the water storage tank 1-3-c of the upper connecting ring for temporary storage.The O-ring groove 1-3-d of the upper connecting ring is also on the side wall of the central through hole of the upper connecting ring 1-3. The inner O-ring 1-8 of the upper connecting ring is installed in the inner O-ring groove 1-3-d of the upper connecting ring. The downhole fluid that returns after being blocked by the second rubber sleeve 1-6 of the upper actuator and the inner O-ring 1-8 of the upper connecting ring will also flow through the diversion groove 1-3-a and the funnel-shaped drainage channel 1-3-b of the upper connecting ring in sequence, and enter the water storage tank 1-3-c of the upper connecting ring for temporary storage.

[0032] When the transducer is working, the lower output rod 4-4 will reciprocate axially. Without suitable dynamic sealing measures, the high downhole pressure will force fluid to enter the lower actuator 4 through the gap between the lower output rod 4-4 and the central through hole of the lower connecting ring 4-3, thus causing device failure. In order to reduce the risk of water ingress into the lower actuator 4, this invention first uses rubber sleeves at both ends of the central through hole of the lower connecting ring 4-3, the shape of which can fit the lower output rod 4-4 and the lower connecting ring 4-3, and uses a suitable adhesive to bond the rubber sleeves to the lower output rod 4-4 and the lower connecting ring 4-3. When the lower output rod 4-4 reciprocates axially, the first rubber sleeve 4-5 and the second rubber sleeve 4-6 of the lower actuator will undergo elastic deformation with the lower output rod 4-4, and the elasticity of the rubber sleeves will provide a dynamic seal for the lower output rod 4-4 during axial reciprocating motion. Secondly, O-rings are installed in the inner groove 4-3-d of the lower connecting ring and the outer groove 4-4-a of the lower output rod. The O-rings undergo compression deformation through an interference fit with the contact surfaces of the lower connecting ring 4-3 and the lower output rod 4-4, thus creating initial contact pressure at the sealing contact surfaces. This initial contact pressure causes the O-rings to fill the gap between the side wall of the central through hole of the lower connecting ring 4-3 and the lower output rod 4-4, achieving a dynamic seal. Considering the high downhole temperature, the rubber sleeve and O-ring will soften as the temperature rises, and the axial reciprocating motion of the output rod will cause a certain degree of wear and aging of the O-rings. Therefore, after a period of dynamic sealing at the output rod using rubber sleeves and O-rings, a small amount of water seepage is inevitable. This invention utilizes metal 3D printing technology to manufacture the lower connecting ring 4-3. The structural features of the lower connecting ring 4-3 include a drainage groove 4-3-a, a funnel-shaped drainage channel 4-3-b, a water storage tank 4-3-c, and an O-ring inlay groove 4-3-d. The drainage groove 4-3-a is located on the side wall of the central through hole of the lower connecting ring 4-3. After the lower actuator 4 is assembled, the drainage groove 4-3-a is above the O-ring inlay groove 4-3-d and below the O-ring outer sleeve groove 4-4-a of the lower output rod, that is, above the inner O-ring 4-8 of the lower connecting ring and below the outer O-ring 4-7 of the lower output rod. Both the inner O-ring 4-8 and the outer O-ring 4-7 of the lower connecting ring will undergo compressive deformation under the pressure of the lower output rod 4-4 and the side wall of the central through hole of the lower connecting ring 4-3. The funnel-shaped drainage channel 4-3-b of the lower connecting ring has a funnel structure that is wider at the top and narrower at the bottom. The wide opening is the water inlet, which communicates with the diversion channel 4-3-a of the lower connecting ring, and the narrow opening is the water outlet, which communicates with the water storage tank 4-3-c of the lower connecting ring. The downhole fluid that breaks through the first rubber sleeve 4-5 of the lower actuator and the outer O-ring 4-7 of the lower output rod will flow from the diversion channel 4-3-a of the lower connecting ring into the funnel-shaped drainage channel 4-3-b of the lower connecting ring, and then flow through the funnel-shaped drainage channel 4-3-b of the lower connecting ring into the water storage tank 4-3-c of the lower connecting ring for temporary storage.The O-ring groove 4-3-d of the lower connecting ring is also on the side wall of the central through hole of the lower connecting ring 4-3. The inner O-ring 4-8 of the lower connecting ring is installed in the O-ring groove 4-3-d of the lower connecting ring. The downhole fluid that returns after being blocked by the second rubber sleeve 4-6 of the lower actuator and the inner O-ring 4-8 of the lower connecting ring will also flow through the diversion groove 4-3-a and the funnel-shaped drainage channel 4-3-b of the lower connecting ring in sequence, and enter the water storage tank 4-3-c of the lower connecting ring for temporary storage.

[0033] like Figure 2A As shown, the upper actuator 1 consists of an upper driver 1-1, an upper actuator outer sleeve 1-2, an upper connecting ring 1-3, an upper output rod 1-4, a first rubber sleeve 1-5 of the upper actuator, a second rubber sleeve 1-6 of the upper actuator, an outer O-ring 1-7 of the upper output rod, and an inner O-ring 1-8 of the upper connecting ring. The outer O-ring 1-7 of the upper output rod is installed in the O-ring outer groove 1-4-a of the upper output rod. To better allow the first rubber sleeve 1-5 and the second rubber sleeve 1-6 of the upper actuator to fit snugly against the upper output rod 1-4, the inner diameters of the central through holes of both the first rubber sleeve 1-5 and the second rubber sleeve 1-6 are smaller than the diameter of the upper output rod 1-4. The upper actuator 1-1 refers to the drive unit of the upper actuator 1. It contains a magnetic circuit structure with a driving magnetic field and a bias magnetic field, which can complete the conversion of electrical energy to magnetic energy to mechanical energy. The upper actuator outer sleeve 1-2 wraps the upper actuator 1-1 inside. The bottom center of the upper actuator 1-1 is directly connected to the upper output rod 1-4. When the transducer is working, the upper actuator 1-1 transmits the driving force to the top of the radiator 3 through the upper output rod 1-4. The bottom side wall of the upper actuator outer sleeve 1-2 is connected to the top side wall of the upper connecting ring 1-3. The central axis of the upper connecting ring 1-3 is a circular hole structure with both ends through it. The upper output rod 1-4 passes through the central through hole of the upper connecting ring 1-3 and connects to the top of the radiator 3. The first rubber sleeve 1-5 of the upper actuator is installed at the position where the upper output rod 1-4 passes through the central through hole of the upper connecting ring 1-3. The second rubber sleeve 1-6 of the upper actuator is installed at the position where the upper output rod 1-4 passes through the central through hole of the upper connecting ring 1-3. The shapes of the first rubber sleeve 1-5 and the second rubber sleeve 1-6 of the upper actuator can fit the upper output rod 1-4 and the upper connecting ring 1-3. A suitable adhesive is used to bond the first rubber sleeve 1-5 and the second rubber sleeve 1-6 of the upper actuator to the contact surface with the upper output rod 1-4 and the upper connecting ring 1-3. The outer O-ring 1-7 of the upper output rod is installed in the outer O-ring groove 1-4-a of the upper output rod. The outer O-ring groove 1-4-a of the upper output rod is an O-ring groove cut from the round rod structure of the upper output rod 1-4. The inner O-ring 1-8 of the upper connecting ring is installed in the inner O-ring groove 1-3-d of the upper connecting ring. The inner O-ring groove 1-3-d of the upper connecting ring is an O-ring groove on the side wall of the central through hole of the upper connecting ring 1-3.

[0034] like Figure 2B As shown, the lower actuator 4 consists of a lower driver 4-1, a lower actuator outer sleeve 4-2, a lower connecting ring 4-3, a lower output rod 4-4, a first rubber sleeve 4-5 of the lower actuator, a second rubber sleeve 4-6 of the lower actuator, an outer O-ring 4-7 of the lower output rod, and an inner O-ring 4-8 of the lower connecting ring. The outer O-ring 4-7 of the lower output rod is installed in the O-ring outer groove 4-4-a of the lower output rod. To better allow the first rubber sleeve 4-5 and the second rubber sleeve 4-6 of the lower actuator to fit snugly against the lower output rod 4-4, the inner diameters of the central through holes of both the first rubber sleeve 4-5 and the second rubber sleeve 4-6 are smaller than the diameter of the lower output rod 4-4. The lower actuator 4-1 refers to the drive unit of the lower actuator 4. It contains a magnetic circuit structure with a driving magnetic field and a bias magnetic field, which can complete the conversion of electrical energy to magnetic energy to mechanical energy. The lower actuator outer sleeve 4-2 wraps the lower actuator 4-1 inside. The top center of the lower actuator 4-1 is directly connected to the lower output rod 4-4. When the transducer is working, the lower actuator 4-1 transmits the driving force to the bottom of the radiator 3 through the lower output rod 4-4. The top sidewall of the lower actuator outer sleeve 4-2 is connected to the bottom sidewall of the lower connecting ring 4-3. The central axis of the lower connecting ring 4-3 has a circular hole structure with both ends through it. The lower output rod 4-4 passes through the central through hole of the lower connecting ring 4-3 and connects to the bottom of the radiator 3. The first rubber sleeve 4-5 of the lower actuator is installed at the position where the lower output rod 4-4 passes through the central through hole of the lower connecting ring 4-3. The second rubber sleeve 4-6 of the lower actuator is installed at the position where the lower output rod 4-4 passes through the central through hole of the lower connecting ring 4-3. The shapes of the first rubber sleeve 4-5 and the second rubber sleeve 4-6 of the lower actuator can fit the lower output rod 4-4 and the lower connecting ring 4-3. A suitable adhesive is used to bond the first rubber sleeve 4-5 and the second rubber sleeve 4-6 of the lower actuator to the contact surface with the lower output rod 4-4 and the lower connecting ring 4-3. The outer O-ring 4-7 of the lower output rod is installed in the outer O-ring groove 4-4-a of the lower output rod. The outer O-ring groove 4-4-a is an O-ring groove cut from the round rod structure of the lower output rod 4-4. The inner O-ring 4-8 of the lower connecting ring is installed in the inner O-ring groove 4-3-d of the lower connecting ring. The inner O-ring groove 4-3-d is an O-ring groove on the side wall of the central through hole of the lower connecting ring 4-3.

[0035] like Figure 3AAs shown, the drainage groove 1-3-a of the upper connecting ring is located on the side wall of the central through hole of the upper connecting ring 1-3. After the upper actuator 1 is assembled, the drainage groove 1-3-a of the upper connecting ring is below the O-ring inner groove 1-3-d of the upper connecting ring and above the O-ring outer groove 1-4-a of the upper output rod, that is, below the inner O-ring 1-8 of the upper connecting ring and above the outer O-ring 1-7 of the upper output rod. Both the outer O-ring 1-7 of the upper output rod and the inner O-ring 1-8 of the upper connecting ring will undergo compression deformation under the pressure of the upper output rod 1-4 and the side wall of the central through hole of the upper connecting ring 1-3. The funnel-shaped drainage channel 1-3-b of the upper connecting ring has a funnel structure that is wider at the top and narrower at the bottom. The wide opening is the water inlet, which communicates with the drainage groove 1-3-a of the upper connecting ring, and the narrow opening is the water outlet, which communicates with the water storage tank 1-3-c of the upper connecting ring. Downhole fluid that breaks through the first rubber sleeve 1-5 of the upper actuator and the outer O-ring 1-7 of the upper output rod will flow from the drainage groove 1-3-a of the upper connecting ring into the funnel-shaped drainage channel 1-3-b of the upper connecting ring, and then flow through the funnel-shaped drainage channel 1-3-b into the water storage tank 1-3-c of the upper connecting ring for temporary storage. The O-ring inlay groove 1-3-d of the upper connecting ring is also on the side wall of the central through hole of the upper connecting ring 1-3. The inner O-ring 1-8 of the upper connecting ring is installed in the inner O-ring inlay groove 1-3-d of the upper connecting ring. Downhole fluid that returns after being blocked by the second rubber sleeve 1-6 of the upper actuator and the inner O-ring 1-8 of the upper connecting ring will also flow sequentially through the drainage groove 1-3-a and the funnel-shaped drainage channel 1-3-b of the upper connecting ring, and enter the water storage tank 1-3-c of the upper connecting ring for temporary storage.

[0036] If downhole fluid is to enter the upper actuator 1 through the gap between the center through hole of the upper output rod 1-4 and the upper connecting ring 1-3, it will need to successively overcome the four dynamic sealing measures to prevent water ingress: the first rubber sleeve 1-5 of the upper actuator, the outer O-ring 1-7 of the upper output rod, the inner O-ring 1-8 of the upper connecting ring, and the second rubber sleeve 1-6 of the upper actuator.

[0037] like Figure 3BAs shown, the drainage groove 4-3-a of the lower connecting ring is on the side wall of the central through hole of the lower connecting ring 4-3. After the lower actuator 4 is assembled, the drainage groove 4-3-a of the lower connecting ring is above the O-ring inner groove 4-3-d of the lower connecting ring and below the O-ring outer groove 4-4-a of the lower output rod, that is, above the inner O-ring 4-8 of the lower connecting ring and below the outer O-ring 4-7 of the lower output rod. Both the outer O-ring 4-7 of the lower output rod and the inner O-ring 4-8 of the lower connecting ring will undergo compression deformation under the pressure of the lower output rod 4-4 and the side wall of the central through hole of the lower connecting ring 4-3. The funnel-shaped drainage channel 4-3-b of the lower connecting ring has a funnel structure that is wider at the top and narrower at the bottom. The wide opening is the water inlet, which communicates with the drainage groove 4-3-a of the lower connecting ring, and the narrow opening is the water outlet, which communicates with the water storage tank 4-3-c of the lower connecting ring. Downhole fluid that breaks through the first rubber sleeve 4-5 of the lower actuator and the outer O-ring 4-7 of the lower output rod will flow from the drainage groove 4-3-a of the lower connecting ring into the funnel-shaped drainage channel 4-3-b of the lower connecting ring, and then flow through the funnel-shaped drainage channel 4-3-b into the water storage tank 4-3-c of the lower connecting ring for temporary storage. The O-ring inlay groove 4-3-d of the lower connecting ring is also on the side wall of the central through hole of the lower connecting ring 4-3. The inner O-ring 4-8 of the lower connecting ring is installed in the inner O-ring inlay groove 4-3-d of the lower connecting ring. Downhole fluid that returns after being blocked by the second rubber sleeve 4-6 of the lower actuator and the inner O-ring 4-8 of the lower connecting ring will also flow sequentially through the drainage groove 4-3-a and the funnel-shaped drainage channel 4-3-b of the lower connecting ring, and enter the water storage tank 4-3-c of the lower connecting ring for temporary storage.

[0038] If downhole fluid is to enter the lower actuator 4 through the gap between the lower output rod 4-4 and the central through hole of the lower connecting ring 4-3, it will need to overcome four dynamic sealing measures to prevent water ingress: the first rubber sleeve 4-5 of the lower actuator, the outer O-ring 4-7 of the lower output rod, the inner O-ring 4-8 of the lower connecting ring, and the second rubber sleeve 4-6 of the lower actuator.

[0039] like Figure 4A As shown, the rubber sleeve above the upper connecting ring 1-3 and the upper output rod 1-4 is the second rubber sleeve 1-6 of the upper actuator. The right side of the figure shows the situation after the upper output rod 1-4 is hidden. The rubber sleeve above the lower connecting ring 4-3 and the lower output rod 4-4 is the first rubber sleeve 4-5 of the lower actuator. In order to better fit the rubber sleeve and the output rod, the inner diameter of the central through hole of the rubber sleeve should be smaller than the diameter of the output rod. The elasticity of the rubber sleeve allows the output rod to still pass through the central through hole of the rubber sleeve. It is necessary to apply a rubber-metal adhesive such as Chemlock or Rohm and Haas at the contact points between the rubber sleeve and the connecting ring and the output rod. In addition, since there are conditions for adhesion between rubber and metal, but it is difficult to form a strong and lasting bond, the connecting ring and the output rod should be surface-treated before applying the adhesive.

[0040] like Figure 4BAs shown, the rubber sleeve below the upper connecting ring 1-3 and the upper output rod 1-4 is the first rubber sleeve 1-5 of the upper actuator. The rubber sleeve below the lower connecting ring 4-3 and the lower output rod 4-4 is the second rubber sleeve 4-6 of the lower actuator. The right side of the figure shows the situation after the lower output rod 4-4 is hidden. Similarly, in order to better fit the rubber sleeve and the output rod, the inner diameter of the central through hole of the rubber sleeve should be smaller than the diameter of the output rod, and a rubber-metal adhesive such as Chemlock or Rohm and Haas needs to be applied to the contact points between the rubber sleeve and the connecting ring and the output rod. In addition, since there are conditions for adhesion between rubber and metal, but it is difficult to form a strong and lasting bond, the connecting ring and the output rod should be surface-treated before applying the adhesive.

[0041] The first rubber sleeve 1-5 and the second rubber sleeve 1-6 of the upper actuator have a disc-shaped bottom to fit the upper connecting ring 1-3. The middle section of the first rubber sleeve 1-5 and the second rubber sleeve 1-6 of the upper actuator has a cylindrical shape to fit the upper output rod 1-4. The first rubber sleeve 1-5 of the upper actuator is installed at the position where the upper output rod 1-4 passes through the central through hole of the upper connecting ring 1-3, and the second rubber sleeve 1-6 of the upper actuator is installed at the position where the upper output rod 1-4 enters the central through hole of the upper connecting ring 1-3. The first rubber sleeve 4-5 and the second rubber sleeve 4-6 of the lower actuator have a disc-shaped bottom to fit the lower connecting ring 4-3. The middle section of the first rubber sleeve 4-5 and the second rubber sleeve 4-6 of the lower actuator has a cylindrical shape to fit the lower output rod 4-4. The first rubber sleeve 4-5 of the lower actuator is installed at the position where the lower output rod 4-4 passes through the central through hole of the lower connecting ring 4-3, and the second rubber sleeve 4-6 of the lower actuator is installed at the position where the lower output rod 4-4 passes through the central through hole of the lower connecting ring 4-3.

[0042] like Figure 5A As shown, the outer O-ring 1-7 of the upper output rod is installed in the O-ring outer groove 1-4-a of the upper output rod. To ensure a better fit between the outer O-ring 1-7 and the upper output rod 1-4, the inner diameter of the outer O-ring 1-7 should be smaller than the diameter of the upper output rod 1-4. The elasticity of the O-ring allows the upper output rod 1-4 to still pass through the outer O-ring 1-7. Furthermore, a rubber-metal adhesive such as Chemlock or Rohm and Haas needs to be applied to the surface of the outer O-ring 1-7 and the O-ring outer groove 1-4-a of the upper output rod. Additionally, since there are conditions for adhesion between rubber and metal, but a strong and durable bond is difficult to form, the surface of the O-ring outer groove 1-4-a of the upper output rod should be carefully treated before applying the adhesive.

[0043] like Figure 5BAs shown, the outer O-ring 4-7 of the lower output rod is installed in the O-ring outer groove 4-4-a of the lower output rod. Similarly, to ensure a better fit between the outer O-ring 4-7 and the lower output rod 4-4, the inner diameter of the outer O-ring 4-7 should be smaller than the diameter of the lower output rod 4-4. The elasticity of the O-ring allows the lower output rod 4-4 to still pass through the outer O-ring 4-7. A rubber-metal adhesive such as Chemlock or Rohm and Haas needs to be applied to the surface of the outer O-ring 4-7 and the O-ring outer groove 4-4-a. Furthermore, since there are conditions for adhesion between rubber and metal, but a strong and durable bond is difficult to form, the surface of the O-ring outer groove 4-4-a of the lower output rod should be carefully treated before applying the adhesive.

[0044] like Figure 6A As shown, the embedded O-ring 1-8 of the upper connecting ring is installed in the O-ring groove 1-3-d of the upper connecting ring. During installation, the elasticity of the embedded O-ring 1-8 is first used to insert it into the central through hole of the upper connecting ring 1-3, and then the embedded O-ring 1-8 is inserted into the O-ring groove 1-3-d of the upper connecting ring section by section. To make the embedded O-ring 1-8 of the upper connecting ring more securely installed in the O-ring groove 1-3-d of the upper connecting ring, a rubber-metal adhesive such as Chemlock or Rohm and Haas can be applied to the surface of the embedded O-ring 1-8, and special attention should be paid to the surface treatment of the O-ring groove 1-3-d of the upper connecting ring.

[0045] like Figure 6B As shown, the embedded O-ring 4-8 of the lower connector ring is installed in the O-ring groove 4-3-d of the lower connector ring. During installation, the elasticity of the embedded O-ring 4-8 is first used to insert it into the central through hole of the lower connector ring 4-3, and then the embedded O-ring 4-8 is inserted into the O-ring groove 4-3-d of the lower connector ring section by section. To make the embedded O-ring 4-8 of the lower connector ring more securely installed in the O-ring groove 4-3-d of the lower connector ring, a rubber-metal adhesive such as Chemlock or Rohm and Haas can be applied to the surface of the embedded O-ring 4-8, and special attention should be paid to the surface treatment of the O-ring groove 4-3-d of the lower connector ring.

[0046] This invention achieves multiple dynamic seals at the output rod of a downhole dual-actuator magnetostrictive transducer, providing dynamic sealing at the output rod from two aspects. Firstly, to prevent water ingress, rubber sleeves with shapes that fit the output rod and the connecting ring are used at both ends of the central through-hole of the connecting ring. A rubber-metal adhesive such as Chemlock or Rohm and Haas is used to bond the rubber sleeves to the output rod and the connecting ring, utilizing the elasticity of the rubber sleeves to provide dynamic sealing for the output rod during axial reciprocating motion. Secondly, O-ring grooves are designed on the sidewall of the central through-hole of the connecting ring and on the output rod. The O-rings are installed in the O-ring groove of the output rod in an outer sleeve form, and in the O-ring groove of the sidewall of the central through-hole of the connecting ring in an inner sleeve form. Again, a rubber-metal adhesive such as Chemlock or Rohm and Haas is used to ensure a more secure installation of the O-rings. The interference fit between the O-rings and the contact surfaces of the output rod and the connecting ring generates compression deformation, preventing water ingress. On the other hand, there is water storage. Metal 3D printing technology is used to manufacture the upper and lower connecting rings. Through the diversion groove and funnel-shaped drainage channel structure inside the connecting ring, the incoming water is guided to the water storage tank inside the connecting ring.

[0047] The above description, in conjunction with specific embodiments, provides a further detailed explanation of the present invention, but it should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications or substitutions should be considered to fall within the scope of protection defined by the claims submitted herein.

Claims

1. A dynamic sealing structure for a downhole dual-actuator super magnetostrictive transducer, characterized in that: It includes an upper actuator (1), a connecting rod (2), a radiator (3), and a lower actuator (4); the upper actuator (1) is connected to the top of the connecting rod (2) through an upper connecting ring (1-3), and the lower actuator (4) is connected to the bottom of the connecting rod (2) through a lower connecting ring (4-3); the radiator (3) is installed inside the connecting rod (2), the top of the radiator (3) is connected to the upper output rod (1-4) in the upper actuator (1) that passes through the central through hole of the upper connecting ring (1-3), and the bottom of the radiator (3) is connected to the lower output rod (4-4) in the lower actuator (4) that passes through the central through hole of the lower connecting ring (4-3); The upper actuator (1) consists of an upper driver (1-1), an upper actuator outer sleeve (1-2), an upper connecting ring (1-3), an upper output rod (1-4), a first rubber sleeve (1-5) of the upper actuator, a second rubber sleeve (1-6) of the upper actuator, an outer O-ring (1-7) of the upper output rod, and an inner O-ring (1-8) of the upper connecting ring; the upper driver (1-1) refers to the driving unit of the upper actuator (1), which contains a magnetic circuit structure with a driving magnetic field and a bias magnetic field, and can complete the conversion of electrical energy to magnetic energy to mechanical energy; the upper actuator outer sleeve (1-2) The upper actuator (1-1) is enclosed within the upper actuator (1-1), and the bottom center of the upper actuator (1-1) is directly connected to the upper output rod (1-4). When the transducer is working, the upper actuator (1-1) transmits the driving force to the top of the radiator (3) through the upper output rod (1-4). The bottom side wall of the upper actuator sleeve (1-2) is connected to the top side wall of the upper connecting ring (1-3). The central axis of the upper connecting ring (1-3) is a circular hole structure with two through holes. The upper output rod (1-4) passes through the central through hole of the upper connecting ring (1-3) and is connected to the top of the radiator (3). The connection is as follows: the first rubber sleeve (1-5) of the upper actuator is installed at the position where the upper output rod (1-4) passes through the central through hole of the upper connecting ring (1-3); the second rubber sleeve (1-6) of the upper actuator is installed at the position where the upper output rod (1-4) enters the central through hole of the upper connecting ring (1-3). The shapes of the first rubber sleeve (1-5) and the second rubber sleeve (1-6) of the upper actuator can fit the upper output rod (1-4) and the upper connecting ring (1-3). The first rubber sleeve (1-5) and the second rubber sleeve (1-6) of the upper actuator are then bonded together. On the contact surfaces of the upper output rod (1-4) and the upper connecting ring (1-3); the outer O-ring (1-7) of the upper output rod is installed in the outer O-ring groove (1-4-a) of the upper output rod, and the outer O-ring groove (1-4-a) of the upper output rod is an O-ring groove cut on the round rod structure of the upper output rod (1-4); the inner O-ring (1-8) of the upper connecting ring is installed in the inner O-ring groove (1-3-d) of the upper connecting ring, and the inner O-ring groove (1-3-d) of the upper connecting ring is an O-ring groove on the side wall of the central through hole of the upper connecting ring (1-3); The structural features of the upper connecting ring (1-3) include a drainage groove (1-3-a), a funnel-shaped drainage channel (1-3-b), a water storage tank (1-3-c), and an O-ring recess (1-3-d). The drainage groove (1-3-a) of the upper connecting ring is located on the side wall of the central through hole of the upper connecting ring (1-3). After the upper actuator (1) is assembled, the drainage groove (1-3-a) of the upper connecting ring is below the O-ring recess (1-3-d) of the upper connecting ring, and is located on the O-ring of the upper output rod. Above the outer groove (1-4-a), that is, below the inner O-ring (1-8) of the upper connecting ring and above the outer O-ring (1-7) of the upper output rod, both the outer O-ring (1-7) of the upper output rod and the inner O-ring (1-8) of the upper connecting ring will undergo compression deformation under the pressure of the side wall of the central through hole of the upper output rod (1-4) and the upper connecting ring (1-3); the inner diameter of the central through hole of the first rubber sleeve of the lower actuator and the inner diameter of the central through hole of the second rubber sleeve of the lower actuator are both smaller than the diameter of the lower output rod (4-4).

2. The dynamic sealing structure of the downhole dual-actuator super magnetostrictive transducer according to claim 1, characterized in that: The funnel-shaped drainage channel (1-3-b) of the upper connecting ring has a funnel structure that is wider at the top and narrower at the bottom. The wide opening is the inlet, which communicates with the diversion channel (1-3-a) of the upper connecting ring, and the narrow opening is the outlet, which communicates with the water storage tank (1-3-c) of the upper connecting ring. The downhole fluid that breaks through the first rubber sleeve (1-5) of the upper actuator and the outer O-ring (1-7) of the upper output rod will flow from the diversion channel (1-3-a) of the upper connecting ring into the funnel-shaped drainage channel (1-3-b) of the upper connecting ring, and then flow through the funnel-shaped drainage channel (1-3-b) of the upper connecting ring into the water storage tank of the upper connecting ring. The O-ring groove (1-3-d) of the upper connecting ring is also on the side wall of the central through hole of the upper connecting ring (1-3). The O-ring (1-8) of the upper connecting ring is installed in the O-ring groove (1-3-d) of the upper connecting ring. The downhole fluid that returns after being blocked by the second rubber sleeve (1-6) of the upper actuator and the O-ring (1-8) of the upper connecting ring will also flow through the diversion groove (1-3-a) and the funnel-shaped drainage channel (1-3-b) of the upper connecting ring in sequence and enter the water storage tank (1-3-c) of the upper connecting ring for temporary storage.

3. The dynamic sealing structure of the downhole dual-actuator super magnetostrictive transducer according to claim 2, characterized in that: The inner diameter of the central through hole of the first rubber sleeve (1-5) of the upper actuator and the inner diameter of the central through hole of the second rubber sleeve (1-6) of the upper actuator are both smaller than the diameter of the upper output rod (1-4).

4. The dynamic sealing structure of the downhole dual-actuator super magnetostrictive transducer according to claim 1, characterized in that: The lower actuator (4) consists of a lower driver (4-1), a lower actuator outer sleeve (4-2), a lower connecting ring (4-3), a lower output rod (4-4), a first rubber sleeve (4-5) of the lower actuator, a second rubber sleeve (4-6) of the lower actuator, an outer O-ring (4-7) of the lower output rod, and an inner O-ring (4-8) of the lower connecting ring; the lower driver (4-1) refers to the driving unit of the lower actuator (4), which contains a magnetic circuit structure with a driving magnetic field and a bias magnetic field, and can complete the conversion of electrical energy to magnetic energy to mechanical energy; the lower actuator outer sleeve (4-2) The lower actuator (4-1) is enclosed within the lower actuator (4-1), and the top center of the lower actuator (4-1) is directly connected to the lower output rod (4-4). When the transducer is working, the lower actuator (4-1) transmits the driving force to the bottom of the radiator (3) through the lower output rod (4-4). The top side wall of the lower actuator outer sleeve (4-2) is connected to the bottom side wall of the lower connecting ring (4-3). The central axis of the lower connecting ring (4-3) is a circular hole structure with two through holes. The lower output rod (4-4) passes through the central through hole of the lower connecting ring (4-3) and is connected to the bottom of the radiator (3). The connection is as follows: the first rubber sleeve (4-5) of the lower actuator is installed at the position where the lower output rod (4-4) passes through the central through hole of the lower connecting ring (4-3); the second rubber sleeve (4-6) of the lower actuator is installed at the position where the lower output rod (4-4) enters the central through hole of the lower connecting ring (4-3). The shapes of both the first rubber sleeve (4-5) and the second rubber sleeve (4-6) of the lower actuator can fit the lower output rod (4-4) and the lower connecting ring (4-3). The first rubber sleeve (4-5) and the second rubber sleeve (4-6) of the lower actuator are then bonded together. On the contact surfaces with the lower output rod (4-4) and the lower connecting ring (4-3); the outer O-ring (4-7) of the lower output rod is installed in the outer O-ring groove (4-4-a) of the lower output rod, which is an O-ring groove cut into the round rod structure of the lower output rod (4-4); the inner O-ring (4-8) of the lower connecting ring is installed in the inner O-ring groove (4-3-d) of the lower connecting ring, which is an O-ring groove on the side wall of the central through hole of the lower connecting ring (4-3).

5. The dynamic sealing structure of the downhole dual-actuator super magnetostrictive transducer according to claim 1, characterized in that: The structural features of the lower connecting ring (4-3) include a drainage groove (4-3-a), a funnel-shaped drainage channel (4-3-b), a water storage tank (4-3-c), and an O-ring inlay groove (4-3-d). The drainage groove (4-3-a) is located on the side wall of the central through hole of the lower connecting ring (4-3). After the lower actuator (4) is assembled, the drainage groove (4-3-a) of the lower connecting ring is above the O-ring inlay groove (4-3-d) of the lower connecting ring, and is located in the lower output... Below the O-ring outer groove (4-4-a) of the output rod, that is, above the embedded O-ring (4-8) of the lower connecting ring and below the outer O-ring (4-7) of the lower output rod, both the outer O-ring (4-7) of the lower output rod and the embedded O-ring (4-8) of the lower connecting ring will undergo compression deformation under the pressure of the side wall of the central through hole of the lower output rod (4-4) and the lower connecting ring (4-3); the funnel-shaped drainage channel (4-3-b) of the lower connecting ring has a funnel structure that is wider at the top and narrower at the bottom, with the wide opening being the water inlet, and is connected to the lower connecting ring. The diversion channel (4-3-a) is connected to the water outlet, which is also connected to the water storage tank (4-3-c) of the lower connecting ring. Downhole fluid that breaks through the first rubber sleeve (4-5) of the lower actuator and the outer O-ring (4-7) of the lower output rod will flow from the diversion channel (4-3-a) of the lower connecting ring into the funnel-shaped drainage channel (4-3-b) of the lower connecting ring, and then through the funnel-shaped drainage channel (4-3-b) into the water storage tank (4-3-c) of the lower connecting ring for temporary storage. The O-ring of the lower connecting ring is embedded within... The groove (4-3-d) is also on the side wall of the central through hole of the lower connecting ring (4-3). The embedded O-ring (4-8) of the lower connecting ring is installed in the groove (4-3-d) of the O-ring of the lower connecting ring. The downhole fluid that returns after being blocked by the second rubber sleeve (4-6) of the lower actuator and the embedded O-ring (4-8) of the lower connecting ring will also flow through the diversion groove (4-3-a) and the funnel-shaped drainage channel (4-3-b) of the lower connecting ring in sequence, and enter the water storage tank (4-3-c) of the lower connecting ring for temporary storage.

6. The dynamic sealing structure of the downhole dual-actuator super magnetostrictive transducer according to claim 1, characterized in that: Both the upper connecting ring (1-3) and the lower connecting ring (4-3) are manufactured using metal 3D printing technology.

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