Ultrasonic therapeutic instrument

Abstract

The utility model relates to an ultrasonic therapeutic instrument, which belongs to the technical field of medical beauty equipment and drives a transducer seat to move in an instrument shell along the guide direction of a guide part through a driving part so as to drive a transducer to move. Compared with the prior art, the moving track of the guide seat is limited through the guide part, the running stability of the transducer is improved, and meanwhile, the moving allowance deviating from the guide direction of the guide part is reserved at the joint of the transducer seat and the guide part, so that the guide seat has a deviating moving space on the guide part, and the moving stability of the transducer is improved. When the guide part has undesirable phenomena such as deformation and abrasion, the guide seat can still adaptively move along the guide direction under the driving of the driving part, the stable movement of the transducer is ensured, the effect of reducing the movement resistance of the transducer is achieved, and the detection device is arranged to detect the connection relationship between the transducer seat and the driving part, so that the reliability of the transducer seat is improved. Therefore, the safety and reliability of the ultrasonic therapeutic apparatus are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical cosmetic equipment, in particular to an ultrasonic therapeutic apparatus. Background Art

[0002] The transducer is an ultrasonic energy source used in the medical field. The thermal effect it generates can stimulate the collagen under the skin tissue to shrink, proliferate, and reorganize. Ultrasonic energy directly reaches the dermis, which can stimulate the continuous regeneration of collagen and reduce deep wrinkles; ultrasonic energy directly reaches the superficial fascia layer, which can tighten the skin and selectively reduce fat and improve contour curves; ultrasonic energy directly reaches the SMAS fascia layer, which can lift the muscle base to achieve firming and lifting.

[0003] At present, the transducer is usually set in the ultrasonic skin treatment device, and it generates heat and performs treatment by linear reciprocating motion during operation to achieve the desired effect. The doctor moves the transducer to the skin area that needs to be treated, covering the entire treatment area.

[0004] However, the resistance of the transmission structure of the transducer in the existing ultrasonic skin therapy device is too large, and most of them are prone to getting stuck during movement, as well as structural problems such as transducer falling off and displacement deviation, which affect the safety and reliability of the ultrasonic skin therapy device in treating patients. Utility Model Content

[0005] In view of this, it is necessary to provide an ultrasonic therapeutic apparatus to solve the problem in the prior art that the transmission structure resistance of the transducer is too large, which affects the safety and reliability of the treatment.

[0006] In order to solve the above problems, the utility model provides an ultrasonic therapeutic instrument, including an instrument housing, a transducer, and a transducer seat, a guide part, a connecting part, and a driving part;

[0007] The transducer seat is used to install the transducer;

[0008] The guide part is arranged in the instrument housing and is connected with the transducer seat in cooperation, and a movable space is provided at the connection between the transducer seat and the guide part to deviate from the guiding direction of the guide part;

[0009] The connecting part is used for detachable connection between the transducer seat and the driving part;

[0010] The driving part is transmission-connected to the transducer seat through the connecting part, and is used for driving the transducer seat to reciprocate along the guiding direction.

[0011] In a possible implementation, the guide portion (2) comprises a first guide rod and a second guide rod, the first guide rod and the second guide rod are arranged in parallel and at intervals in the instrument housing (10), the first guide rod and the second guide rod are slidably connected to the transducer seat (1) through a guide channel extending along a guide direction on the transducer seat (1), and the connection between the transducer seat (1) and one of the first guide rod and the second guide rod has the movable space.

[0012] In a possible implementation, the guide channel includes a reference hole and an adjustment hole, the first guide rod is movably inserted in the reference hole, and the inner wall of the reference hole is in contact with the first guide rod; the second guide rod is movably inserted in the adjustment hole, and there is a movable space between the adjustment hole and the second guide rod.

[0013] In a possible implementation, one side of the adjustment hole has an opening, an inner wall of the main hole of the adjustment hole is fitted to the second guide rod, and the second guide rod can deviate from the main hole of the adjustment hole through the opening of the adjustment hole.

[0014] In a possible implementation, the driving part includes a driving motor, a screw, a slider and a driving rod, the output end of the driving motor is fixedly connected to the screw, the slider is slidably mounted on the screw and threadedly connected to the screw, one end of the driving rod is connected to the slider, and the other end is fixedly connected to the connecting part, and the driving rod is parallel to the guiding direction of the guide part.

[0015] In a possible implementation, the connecting portion includes a first magnet and a second magnet that attract each other, the first magnet is fixedly connected to the driving rod, and the second magnet is fixedly connected to the transducer seat.

[0016] In a possible implementation, it also includes a detection device, which is used to detect whether the first magnet and the second magnet are attracted to each other; the detection device includes a detection rod and a position detector, when the first magnet and the second magnet are attracted to each other, one end of the detection rod abuts against the end of the second magnet, and the other end is located in the detection area of ​​the position detector.

[0017] In a possible implementation, a connecting rod is further included, the connecting rod is connected to the transducer seat, and the second magnet is arranged on the end surface of the connecting rod; the connecting rod is a hollow tube, and a vent hole is arranged on the tube wall.

[0018] In a possible implementation manner, a sealing member is further included, wherein the sealing member has a sealed cavity, and the driving member, the connecting rod and the connecting member are located in the sealed cavity.

[0019] In some possible implementations, the seal includes a first seal and a second seal, the first seal being sleeved on the driving rod, one end of the first seal being sealed connected to the instrument housing, and the other end being sealed connected to one side of the connecting rod; the second seal being sleeved on the connecting rod, one end of the second seal being sealed connected to the other side of the transducer seat, and the other end being sealed connected to the instrument housing.

[0020] The beneficial effects of the utility model are:

[0021] The utility model provides an ultrasonic therapeutic instrument, which drives the transducer seat to move along the guide direction of the guide part in the instrument housing through a driving part, thereby driving the transducer to move. Compared with the prior art, the utility model limits the movement trajectory of the transducer seat through the guide part, thereby improving the stability of the transducer operation. At the same time, the connection between the transducer seat and the guide part leaves an activity space that deviates from the guide direction of the guide part. When the guide part is deformed, worn, or stuck, stuck, or other undesirable phenomena occur during movement, the transducer seat can still move adaptively along the guide direction through the activity space of the guide part under the drive of the driving part, ensuring the smooth movement of the transducer, achieving the effect of reducing the movement resistance of the transducer, and improving the safety and reliability of the ultrasonic therapeutic instrument. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 An exploded view of the structure of an ultrasonic therapeutic apparatus according to an embodiment of the present invention;

[0023] Figure 2 A side sectional view of an embodiment of an ultrasonic therapeutic apparatus provided by the utility model;

[0024] In the figure: 1-transducer seat, 2-guide part, 3-connecting part, 31-first magnet, 32-second magnet, 4-driving part, 41-driving motor, 42-screw rod, 43-slider, 44-driving rod, 5-detection device, 6-connecting rod, 7-first sealing member, 8-second sealing member, 9-vent, 10-instrument housing, 11-transducer, 12-water injection hole. DETAILED DESCRIPTION

[0025] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0026] The main structure of the ultrasonic therapeutic device includes a handle and a treatment head. In order to make the structure lightweight and miniaturized, various control components and electrical components are arranged in the handle. The treatment head part includes a transducer arranged inside the shell and a transducer seat for mounting the transducer. Specifically, the transducer is located in the motion cavity, and the motion cavity is filled with liquid. The shell of the ultrasonic therapeutic device is provided with a sliding water injection cover and a corresponding water injection hole 12 for filling the motion cavity with liquid.

[0027] Combination Figure 1 and Figure 2 As shown, a specific embodiment of the utility model discloses an ultrasonic therapeutic device, comprising: a transducer seat 1, a guide part 2, a connecting part 3 and a driving part 4;

[0028] The transducer seat 1 is used to install the transducer;

[0029] The guide portion 2 is arranged in the instrument housing (10) and is connected with the transducer seat 1 in cooperation with each other. The connection between the transducer seat 1 and the guide portion 2 has a movable space that deviates from the guiding direction of the guide portion 2.

[0030] One end of the connecting part 3 is connected to the transducer seat 1, and the other end is connected to the driving part 4;

[0031] The driving part 4 is connected to the transducer seat 1 through the connecting part 3, and is used to drive the transducer seat 1 to move along the guiding direction;

[0032] In this embodiment, the movement trajectory of the transducer seat 1 is limited by the guide portion 2 to improve the stability of the transducer operation. At the same time, a movement space that deviates from the guide direction of the guide portion 2 is reserved at the connection between the transducer seat 1 and the guide portion 2. When the guide portion 2 is deformed, worn, or different spindles are stuck during movement, the transducer seat 1 can still adaptively move along the guide direction through the movement space of the guide portion 2 under the drive of the drive portion 4, thereby ensuring the smooth movement of the transducer and reducing the movement resistance of the transducer. At the same time, the problem of non-concentric offset of the two stainless steel guide rods generated by the transducer while ensuring the smooth reciprocating linear motion is solved, thereby reducing the movement resistance.

[0033] The guide portion 2 may be in the shape of a track, and the extension direction of the track is the guide direction. In a preferred embodiment, the guide portion 2 includes a first guide rod and a second guide rod, the first guide rod and the second guide rod are parallelly distributed and spaced apart in the instrument housing (10), the first guide rod and the second guide rod are both slidably connected to the transducer, and the connection between the second guide rod and the transducer seat 1 has the movable space.

[0034] It should be noted that the guide portion 2 may also include other numbers of guide rods, and it is only necessary to ensure that one of the guide rods in the guide portion 2 has both a guiding function and a limiting function, and the other guide rod has an adjusting function. In this embodiment, the first guide rod has a guiding and limiting function, and there is a movable space between the second guide rod and the transducer seat 1, which can avoid the problem of non-concentric offset of the double rod movement, and therefore has an adjusting function. Therefore, in this embodiment, the number of guide rods in the guide portion 2 is two, which can not only meet the functions of limiting and adjusting, but also reduce the complexity of the device.

[0035] Furthermore, the first guide rod and the second guide rod may be rigid sleeves.

[0036] In some embodiments, the guide portion (2) includes a first guide rod and a second guide rod, the first guide rod and the second guide rod are distributed in parallel and spaced apart in the instrument housing (10), the first guide rod and the second guide rod are slidably connected to the transducer seat (1) through a guide channel extending along a guide direction on the transducer seat (1), and the connection between the transducer seat (1) and one of the first guide rod and the second guide rod has the movable space.

[0037] In this embodiment, the guide channel can be a guide groove opened on the surface of the transducer seat 1, which overlaps the transducer seat 1 so that the transducer seat 1 can slide along the track of the guide part 2. The size of the guide groove can be slightly larger than the size of the guide part 2 to reserve a margin for movement.

[0038] In a specific embodiment, the guide channel includes a reference hole and an adjustment hole, the first guide rod is movably inserted in the reference hole, and the inner wall of the reference hole is in contact with the first guide rod; the second guide rod is movably inserted in the adjustment hole, and there is a movable space between the adjustment hole and the second guide rod.

[0039] It should be noted that this embodiment constructs the guide channel in the form of a reference hole and an adjustment hole, and the first guide rod and the second guide rod can be wrapped by the reference hole and the adjustment hole. Compared with the above-mentioned implementation method of the guide groove, this embodiment makes the operation of the transducer seat 1 more stable.

[0040] In order to ensure that there is a movable space between the second guide rod and the adjustment hole, the diameter of the adjustment hole can be larger than the diameter of the second guide rod. In a more preferred embodiment, one side of the adjustment hole has an opening, the inner wall of the main hole of the adjustment hole is attached to the second guide rod, and the second guide rod can deviate from the main hole of the adjustment hole through the opening of the adjustment hole.

[0041] It should be noted that, on the one hand, the main hole of the adjustment hole fits perfectly with the second guide rod, which can make the second guide rod and the transducer seat 1 have relative stability, ensuring the smoothness of the transducer's linear motion; on the other hand, the adjustment hole has an opening, which can make the second guide rod adaptively driven. When the resistance is too large, the adjustment hole can be deformed through the opening to reduce the movement resistance between the transducer seat 1 and the second guide rod, thereby avoiding the transducer seat from getting stuck, ensuring the smooth reciprocating linear motion of the transducer, and further improving the safety and reliability of the ultrasonic skin therapy device in treating patients.

[0042] Furthermore, in a preferred embodiment, both ends of the guide portion 2 are respectively connected to the inner wall of the instrument housing (10), the diameters of the plurality of guide portions 2 are the same, and the plurality of guide portions 2 are arranged on the same horizontal plane.

[0043] The connecting portion 3 includes a first magnet 31 and a second magnet 32 ​​that can attract each other. The first magnet 31 is fixedly connected to the driving portion 4 , and the second magnet 32 ​​is fixedly connected to the transducer seat 1 .

[0044] In this embodiment, the driving part 4 and the transducer seat 1 are connected by a strong magnet as the connecting part 3, so as to optimize the structure of the transmission assembly, reduce the resistance of linear reciprocating motion, and reduce the probability of the occurrence of the phenomenon such as the motion of the non-central axis being stuck. At the same time, the use of the strong magnetic attraction method can facilitate the detection device 5 to more quickly detect whether the connecting part 3 tightly connects the driving part 4 and the transducer seat 1; on the other hand, the use of a strong magnet as the connecting part 3 has a greater connection strength and a better connection effect than the use of an ordinary magnet.

[0045] In some embodiments, the driving unit 4 includes a driving motor 41, a screw rod 42, a slider 43 and a driving rod 44. The output end of the driving motor 41 is fixedly connected to the screw rod 42. The slider 43 can be slidably mounted on the screw rod 42 and is threadedly connected to the screw rod 42. One end of the driving rod 44 is connected to the first magnet 31 and the other end is fixedly connected to the slider 43. The driving rod 44 is distributed along the guiding direction of the guide unit 2.

[0046] In this embodiment, the driving unit 4 adopts a single-axis guided transmission structure such as a screw-nut mechanism. The single-axis guided structure is a concept commonly used in the design of machinery, motion control systems or mechanical structures. It refers to a machine or system with only one axis or linear guide to guide and control the movement of an object or component. In a single-axis guided structure, an object or component moves linearly along a single axis or guide. This axis or guide usually has one or more drive devices, such as a screw, gear or linear motor, etc., to control the position and speed of the object. The single-axis guided structure has a simple and compact design and is suitable for applications that require controlling the linear motion or position of an object. The use of a single-axis guided transmission structure in this embodiment can minimize the problem of eccentricity caused by multi-axis transmission, and has the advantages of high precision requirements and reduced transmission resistance.

[0047] Further, in a preferred embodiment, the material of the screw rod 42 and the slider 43 is polyetherimide. This embodiment uses polyetherimide (PEI) as the material of the slider 43 component. Polyetherimide (PEI) is a high-performance engineering plastic with excellent physical, mechanical and thermal properties. It is a polymer material obtained by the polymerization reaction of ether and imide. Polyetherimide has high strength and rigidity. These characteristics make it a very reliable material in structural applications. Polyetherimide can withstand certain friction without loss. In addition, polyetherimide also has excellent chemical stability and electrical insulation. It can resist corrosion from a variety of chemicals and has very low water absorption. This makes polyetherimide perform well in environments that require long-term contact with chemicals or water. In this embodiment, this material has the advantages of low friction coefficient, wear resistance and dimensional stability, which makes the slider 43 not easy to deform during movement and has low friction resistance.

[0048] It is understandable that in practice, the ultrasonic therapeutic device also requires circuit boards, control chips and other devices to realize control during operation. However, details such as these not mentioned in this article are existing technologies that can be known to technical personnel in this field, so they will not be explained in detail in this article.

[0049] In some embodiments, the detection device 5 includes a detection rod and a position detector, one end of the detection rod abuts against the end of the connecting portion 3 close to the transducer seat 1, and the other end is connected to the position detector, and the position detector is used to detect the positional relationship between the detection rod and the connecting portion 3. Furthermore, the connecting portion 3 is provided to connect the transducer seat 1 and the driving portion 4, and a detection rod is provided on the connecting portion 3 to detect whether the driving portion 4 and the transducer seat 1 are tightly connected during movement. If the transducer seat 1 is separated from the driving portion 4, a detection signal is generated by the position detector to stop the transducer from outputting energy, thereby improving the safety and reliability of the ultrasonic therapeutic device.

[0050] In some embodiments, the driving rod 44 and the first magnet 31 are provided with a through hole along the length direction of the driving rod 44, the detection rod can be movably inserted into the through hole, and one end of the detection rod is connected to the position detector and the other end is abutted against the second magnet, and the position detector is used to detect the position relationship between the detection rod and the second magnet.

[0051] In this embodiment, the detection rod slides in the driving rod 44 and can pass through the first magnet. The first magnet and the second magnet are attracted to each other, thereby abutting the movement of the detection rod so that it can be detected by the sensor on the position detector, thereby realizing the disconnection detection of the transducer and improving the reliability of the ultrasonic therapeutic device.

[0052] Furthermore, in a preferred embodiment, the guide part 2, the driving rod 44 and the detection rod are all made of stainless steel. Stainless steel has the advantages of high strength, wear resistance, smooth surface and not easy to get stuck, which can reduce the running resistance of the transducer and improve reliability.

[0053] Furthermore, in a preferred embodiment, the position detector adopts an optical sensor, and may also adopt other displacement sensors, such as a resistive sensor, to detect the position of the detection rod.

[0054] In some embodiments, it also includes a connecting rod 6, one end of which is connected to the transducer seat 1, and the other end is connected to the second magnet 32, and also includes a sealing member, the sealing member has a closed cavity, and the driving member, the connecting rod and the connecting member are located in the closed cavity.

[0055] It should be noted that by arranging the driving member, the connecting rod and the connecting member in a closed cavity, waterproof protection can be provided. The connecting rod 6 is a hollow tube with a vent hole 9 arranged on the tube wall. The vent hole 9 allows air to circulate inside and outside the seal to ensure air pressure balance.

[0056] In a specific embodiment, the seal comprises a first seal 7 and a second seal 8; the first seal 7 is sleeved on the connecting rod 6, one end of the first seal 7 is sealed connected to one side of the transducer seat 1, and the other end is sealed connected to the instrument housing 10;

[0057] The second sealing member 8 and the first sealing member 7 are coaxially arranged and respectively located on both sides of the transducer seat 1 . One end of the second sealing member 8 is sealedly connected to the other side of the transducer seat 1 , and the other end is sealedly connected to the instrument housing 10 .

[0058] In actual use, the transducer needs to be immersed in the water in the instrument housing 10, so the first sealing member 7 provided in this embodiment is a telescopic tube with a silicone corrugated structure, which provides waterproof protection on the one hand, and reduces the resistance of the transducer operation through its own elastic force. In this embodiment, the hole on the instrument housing 10 for inserting the driving rod 44 can be used as the exhaust hole of the first sealing member 7.

[0059] The second seal 8 is coaxially arranged with the first seal 7. The second seal 8 is similar to the first seal 7 and is also a bellows-shaped telescopic tube, which can also play the role of reducing resistance and waterproof protection. In addition, the first seal 7 and the second seal 8 can also bring a certain elasticity and damping effect to the movement of the transducer seat 1, making the operation more stable and reliable.

[0060] Further, in a preferred embodiment, the first seal 7 and the second seal 8 are both telescopic tubes with a highly flexible corrugated structure, and the hardness of the telescopic tubes of the first seal 7 and the second seal 8 is 30. It can be understood that in other embodiments, the seals can be made of other materials and other structures.

[0061] Highly flexible silicone is a soft, elastic and organic silicon compound material. It is made of high-quality silicone rubber. Highly flexible silicone can be easily twisted and deformed, and can maintain its shape and characteristics when it is restored to its original state. The material can withstand use in high temperature environments, is not easy to deform or crack, and is often used in fields that require high temperature stability, such as the automotive industry, electronic equipment, and industrial equipment. Highly flexible silicone has good corrosion resistance to many chemicals and can resist the erosion of acids, alkalis, and other common solvents, so it has a wide range of applications in the chemical industry and related fields. In addition, the material has excellent electrical insulation properties and can effectively prevent the passage of current, so it is often used in electronic equipment, insulating gaskets, and electrical engineering. Highly flexible silicone can withstand long-term use and will not be significantly deteriorated by atmospheric oxygen, humidity, and ultraviolet rays, so it has a long life and durability. The commonly used silicone hardness is generally 30-70 degrees Shore A. In this embodiment, a seal of 30 degrees Shore A is used as the first seal 7 and the second seal 8 to minimize the resistance to the expansion and contraction of the seal.

[0062] The above design is an improvement on the material and structure of the sealing telescopic tube, and the resistance caused by the compression and stretching of the two sealing parts is minimized by using highly flexible silicone and optimizing the telescopic folding edge.

[0063] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. An ultrasonic therapeutic device, comprising an instrument housing (10) and a transducer (11), characterized in that: include: A transducer seat (1), a guide portion (2), a connecting portion (3) and a driving portion (4); The transducer seat (1) is used to mount the transducer; The guide portion (2) is arranged in the instrument housing (10) and is connected to the transducer seat (1); a connection between the transducer seat (1) and the guide portion (2) has a movable space that deviates from the guiding direction of the guide portion (2); The connecting portion (3) is used for detachably connecting the transducer seat (1) and the driving portion (4); The driving portion (4) is transmission-connected to the transducer seat (1) via the connecting portion (3), and is used to drive the transducer seat (1) to reciprocate along the guiding direction.

2. The ultrasonic therapeutic apparatus according to claim 1, characterized in that: The guide portion (2) comprises a first guide rod and a second guide rod, the first guide rod and the second guide rod are arranged in parallel and at intervals in the instrument housing (10), the first guide rod and the second guide rod are slidably connected to the transducer seat (1) through a guide channel extending along a guide direction on the transducer seat (1), and the connection between the transducer seat (1) and one of the first guide rod and the second guide rod has the movable space.

3. The ultrasonic therapeutic apparatus according to claim 2, characterized in that: The guide channel includes a reference hole and an adjustment hole. The first guide rod is movably inserted in the reference hole, and the inner wall of the reference hole is in contact with the first guide rod. The second guide rod is movably inserted in the adjustment hole, and there is a movable space between the adjustment hole and the second guide rod.

4. The ultrasonic therapeutic apparatus according to claim 3, characterized in that: One side of the adjustment hole has an opening, the inner wall of the main hole of the adjustment hole is attached to the second guide rod, and the second guide rod can deviate from the main hole of the adjustment hole through the opening of the adjustment hole.

5. The ultrasonic therapeutic apparatus according to claim 1, characterized in that: The driving portion (4) comprises a driving motor (41), a screw rod (42), a slider (43) and a driving rod (44); the output end of the driving motor (41) is fixedly connected to the screw rod (42); the slider (43) is slidably sleeved on the screw rod (42) and is threadedly connected to the screw rod (42); one end of the driving rod (44) is connected to the slider (43) and the other end is fixedly connected to the connecting portion (3); the driving rod (44) is parallel to the guiding direction of the guiding portion (2).

6. The ultrasonic therapeutic apparatus according to claim 5, characterized in that: The connecting portion (3) comprises a first magnet (31) and a second magnet (32) which attract each other, the first magnet (31) being fixedly connected to the driving rod (44), and the second magnet (32) being fixedly connected to the transducer seat (1).

7. The ultrasonic therapeutic apparatus according to claim 6, characterized in that: The device further comprises a detection device (5), the detection device (5) being used to detect whether the first magnet (31) and the second magnet (32) are attracted to each other; the detection device (5) comprises a detection rod and a position detector, and when the first magnet (31) and the second magnet (32) are attracted to each other, one end of the detection rod abuts against the end of the second magnet (32), and the other end is located in the detection area of ​​the position detector.

8. The ultrasonic therapeutic apparatus according to claim 6, characterized in that: It also comprises a connecting rod (6), the connecting rod (6) being connected to the transducer seat (1), the second magnet (32) being arranged on the end surface of the connecting rod (6); the connecting rod (6) being a hollow tube, a vent hole being arranged on the tube wall.

9. The ultrasonic therapeutic apparatus according to claim 8, characterized in that: It also comprises a sealing member, the sealing member having a sealed cavity, the driving rod, the connecting rod (6) and the connecting rod being located in the sealed cavity.

10. The ultrasonic therapeutic apparatus according to claim 9, characterized in that: The sealing member comprises a first sealing member (7) and a second sealing member (8); the first sealing member (7) is sleeved on the driving rod (44); one end of the first sealing member (7) is sealingly connected to the instrument housing (10) and the other end is sealingly connected to one side of the connecting rod (6); the second sealing member (8) is sleeved on the connecting rod (6); one end of the second sealing member (8) is sealingly connected to the other side of the transducer seat (1) and the other end is sealingly connected to the instrument housing (10).

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