Waterproof transducer

Abstract

The utility model belongs to the field of ultrasonic medical instruments, and particularly relates to a waterproof transducer which comprises a rear cover plate, a front cover plate, a piezoelectric ceramic module and a glue injection ring, the piezoelectric ceramic module is installed between the front cover plate and the rear cover plate, the piezoelectric ceramic module is arranged on the rear cover plate in a sleeved mode, and an annular cavity is formed between the piezoelectric ceramic module and the rear cover plate; a glue injection ring is arranged between the piezoelectric ceramic module and the rear cover plate, a plurality of through holes are formed in the glue injection ring, and the through holes are communicated with the annular cavity; waterproof covering layers are formed on the inner circumference and the outer circumference of the piezoelectric ceramic module; according to the transducer glue injection device, glue is injected into the transducer through one through hole, right opposite to the glue injection ring, of an injection molding machine, air is exhausted through the other through holes, the one-time glue injection process for the interior and the exterior of the transducer can be achieved, the glue injection efficiency is improved, the sealing performance and the waterproof effect of the interior and the exterior of the transducer are guaranteed, and automatic production is easy to achieve.

Description

Technical Field

[0001] The utility model belongs to the field of ultrasonic medical equipment, and in particular relates to a waterproof transducer. Background Art

[0002] The ultrasonic tooth cleaner generates ultrasonic frequency electric pulse waves by an electronic oscillation circuit, which are amplified to a certain intensity and transmitted to the transducer, which converts electrical energy into mechanical energy, stimulating the working tip to produce vibrations of the same frequency, thereby breaking up tartar or removing smoke stains, tea stains, and pigments on the tooth surface quickly and efficiently.

[0003] The transducer is the core component of the ultrasonic dental cleaner and is installed inside the handle of the ultrasonic dental cleaner. In order to ensure the working performance of the transducer, it needs to be waterproof and sealed. Most of the existing technologies achieve the purpose of waterproofing by brushing, injecting silicone or other rubber inside and outside the piezoelectric ceramic module of the transducer to isolate the piezoelectric ceramic module from the outside air and internal water channels.

[0004] For example, the patent document with the publication number CN103341438A discloses a waterproof transducer, which forms a cavity among the front cover, the piezoelectric ceramic module and the rear cover by opening a hole in the rear cover and the front cover respectively, and injects glue from the opening of the front cover or the rear cover by manual injection, and then injects glue from the other side. After injecting glue, the silicone is cured by heating and vulcanization. After curing, a layer of silicone is wrapped on the outer surface of the transducer by an injection molding machine. The process is complicated, and bubbles are easily generated inside the opening of the rear cover or the front cover by manual injection, which easily makes the waterproofing fail.

[0005] Another example is the patent document with publication number CN102228886A, which discloses a waterproof ultrasonic transducer. By opening a hole in the front cover plate and injecting silica gel into the cavity formed by the front cover plate and the rear cover plate, the cooling water at the front cover plate end is prevented from invading the piezoelectric ceramic module inside the transducer through the gap between the threaded connection between the rear cover plate and the front cover plate, thereby causing the risk of transducer failure. This solution cannot prevent the problem of high-temperature water vapor invading the piezoelectric ceramic module due to the failure of the silica gel outside the transducer, thereby causing the transducer to fail, and the waterproof effect is poor.

[0006] In summary, the existing technology cannot achieve complete isolation between the piezoelectric ceramic module and the connecting rod, and it is difficult to prevent the intrusion of high-temperature water vapor into the transducer due to the failure of the external silicone of the transducer. At the same time, the internal waterproof isolation can only be completed manually, and then the waterproof purpose of the specific external position can be achieved by using a silicone injection molding machine, and the production efficiency is low.

[0007] Based on this, it is necessary to improve the defects of the prior art to overcome the shortcomings in practical applications. Utility Model Content

[0008] Based on the above-mentioned shortcomings and deficiencies in the prior art, one of the purposes of the present invention is to at least solve one or more of the above-mentioned problems in the prior art. In other words, one of the purposes of the present invention is to provide a waterproof transducer that meets one or more of the above-mentioned needs.

[0009] In order to achieve the above utility model purpose, the utility model adopts the following technical solutions:

[0010] The utility model provides a waterproof transducer, comprising a rear cover plate, a front cover plate, a piezoelectric ceramic module and a glue injection ring, wherein the piezoelectric ceramic module is installed between the front cover plate and the rear cover plate, the piezoelectric ceramic module is sleeved on the rear cover plate and forms an annular cavity with the rear cover plate; the glue injection ring is installed between the piezoelectric ceramic module and the rear cover plate, a plurality of through holes are provided on the glue injection ring, and the through holes are connected with the annular cavity; the inner circumference and the outer circumference of the piezoelectric ceramic module form a waterproof covering layer.

[0011] As a preferred solution, the glue injection ring is provided with a plurality of through holes along a circumferential array, and the plurality of through holes are respectively configured as glue injection holes and exhaust holes.

[0012] As a preferred embodiment, the rear cover plate includes a cover plate body and a connecting rod, one end of the connecting rod is built into the front cover plate and threadedly matched with the front cover plate, a reserved gap is provided between the end of the front cover plate and the connecting rod, and the reserved gap is connected to the annular cavity.

[0013] As a preferred solution, a piezoelectric ceramic module and a glue injection ring are installed between the cover plate body and the front cover plate, and the piezoelectric ceramic module is tightly matched with the glue injection ring.

[0014] As a preferred solution, the glue injection ring is sleeved on the connecting rod, and the inner wall of the glue injection ring is connected to the annular cavity.

[0015] As a preferred solution, the waterproof covering layer is wrapped around the inner and outer circumferences of the piezoelectric ceramic module to seal the piezoelectric ceramic module.

[0016] As a preferred solution, the thickness of the annular cavity is set to 0.1-1 mm.

[0017] As a preferred solution, the piezoelectric ceramic module includes a piezoelectric ceramic sheet and an electrode sheet, and the piezoelectric ceramic sheet is electrically connected to the electrode sheet.

[0018] As a preferred solution, the waterproof covering layer is configured to include one or more of silicone, fluororubber, and nitrile rubber.

[0019] As a preferred solution, the diameter of the through hole is set to 0.2-3 mm.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] The utility model provides a waterproof transducer, which first injects glue into the inside of the transducer through a through hole of a glue injection ring of an injection molding machine, and exhausts air through the remaining through holes, so that a one-time glue injection process for the inside and outside of the transducer can be achieved, thereby improving the glue injection efficiency, ensuring the sealing and waterproof effect of the inside and outside of the transducer, and only requires one-time injection molding by the injection molding machine, so that automated production can be easily achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, drawings of other embodiments can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the overall structure of a waterproof transducer according to an embodiment of the utility model;

[0024] Figure 2 is a cross-sectional view of a waterproof transducer according to an embodiment of the utility model;

[0025] Figure 3 yes Figure 2 AA cross section in;

[0026] Figure 4 This is a schematic structural diagram of a glue injection ring according to an embodiment of the utility model;

[0027] In the figure: 1 rear cover, 11 cover body, 12 connecting rod, 2 front cover, 3 piezoelectric ceramic module, 31 piezoelectric ceramic sheet, 32 electrode sheet, 4 glue injection ring, 41 through hole, 5 annular cavity, 6 waterproof covering layer, 61 first waterproof covering layer, 62 second waterproof covering layer, 7 wire. DETAILED DESCRIPTION

[0028] In order to more clearly illustrate the embodiments of the present application, the specific implementation methods of the present application will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0029] In the description of the embodiments of the present application, the terms "inside", "outside", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the application. In addition, the terms "first", "second", etc. are only used to distinguish in the description and have no special meaning.

[0030] According to some embodiments of the present application, a waterproof transducer is provided. Figures 1 to 4 As shown, it includes a rear cover plate 1, a front cover plate 2, a piezoelectric ceramic module 3 and a glue injection ring 4. The piezoelectric ceramic module 3 is installed between the front cover plate 2 and the rear cover plate 1. The piezoelectric ceramic module 3 is sleeved on the rear cover plate 1 and forms an annular cavity 5 with the rear cover plate 1; the glue injection ring 4 is installed between the piezoelectric ceramic module 3 and the rear cover plate 2, and a plurality of through holes 41 are provided on the glue injection ring 4, which are connected with the annular cavity 5; the inner circumference and the outer circumference of the piezoelectric ceramic module 3 form a waterproof covering layer 6, thereby realizing the sealing of the transducer.

[0031] In the embodiment of the present application, the glue injection ring 4 is provided with a plurality of through holes 41 along a circumferential array, and the plurality of through holes 41 are respectively configured as glue injection holes and exhaust holes, wherein the glue injection holes are used to inject glue into the annular cavity 5, and the exhaust holes are used to ensure that the pressure inside and outside the annular cavity 5 is balanced during the glue injection process, so as to complete smooth and rapid glue injection. On the other hand, during the glue injection process, the glue can also overflow through the exhaust holes to the outer circumference of the piezoelectric ceramic module 3 and wrap to form a waterproof covering layer 6.

[0032] In some embodiments, at least two through holes 41 are provided, one of which is configured as a glue injection hole and the other is configured as an exhaust hole. It should be noted that the number of through holes 41 can also be set to three, four or more, at least one of which is configured as a glue injection hole and the rest are configured as exhaust holes.

[0033] In the embodiment of the present application, the aperture of the through hole 41 is set to 0.2-3 mm, preferably 2 mm. In practical applications, the aperture of the through hole 41 can be arbitrarily selected within the range of 0.2-3 mm according to requirements.

[0034] In an embodiment of the present application, the rear cover plate 1 includes a cover plate body 11 and a connecting rod 12, one end of the connecting rod 12 is built into the front cover plate 2 and threadedly matched with the front cover plate 2, and a reserved gap is provided between the end of the front cover plate 2 and the connecting rod 12, and the reserved gap is connected to the annular cavity 5.

[0035] Furthermore, the rear cover plate 1 is an integrated part, that is, the cover plate body 11 and the connecting rod 12 are formed from the same blank or raw material through an integrated forming process including but not limited to machining, casting or additive manufacturing. By setting the rear cover plate 1 as an integrated part, the phenomenon of reduced sealing effect on the piezoelectric ceramic module due to assembly quality or wear of components during assembly can be reduced in the later assembly process.

[0036] Furthermore, compared with the separate structure, the integrally formed structure of the cover body 11 and the connecting rod 12 can not only improve the sealing effect, but also improve the installation accuracy, ensuring that the side wall of the cover body 11 is tightly matched with the side wall of the injection ring 4.

[0037] In an embodiment of the present application, a piezoelectric ceramic module 3 and a glue injection ring 4 are installed between the cover body 11 and the front cover 2. The piezoelectric ceramic module 3 and the glue injection ring 4 are tightly matched. Both side walls of the glue injection ring 4 are precision planes, which can reduce friction with the piezoelectric ceramic module 3.

[0038] Furthermore, the glue injection ring 4 is sleeved on the connecting rod 12 , the inner wall of the glue injection ring 4 is connected to the annular cavity 5 , and glue is injected into the annular cavity 5 through the through hole 41 to form a waterproof covering layer 6 .

[0039] Since the exposed area of ​​the outer side of the piezoelectric ceramic module in the transducer is large and it cannot be hard-connected due to functional requirements, the outer side of the piezoelectric ceramic module needs to be sealed by a waterproof covering layer 6, and the waterproof covering layer 6 is wrapped around the inner and outer circumferences of the piezoelectric ceramic module 3.

[0040] Furthermore, the waterproof covering layer 6 includes a first waterproof covering layer 61 and a second waterproof covering layer 62. The first waterproof covering layer 61 is arranged in the annular cavity 5, and the second waterproof covering layer 62 is wrapped around the outside of the piezoelectric ceramic module 3. The first waterproof covering layer 61 and the second waterproof covering layer 62 are completed by one-time injection molding by an injection molding machine.

[0041] Furthermore, the waterproof covering layer 6 is configured to include one or more of silicone, fluororubber, and nitrile rubber, and can be specifically configured according to actual needs. Through the good water resistance, air tightness, and excellent bonding properties of the waterproof covering layer, the piezoelectric ceramic module can be sealed and waterproofed, thereby ensuring the performance of the transducer.

[0042] In the embodiment of the present application, the thickness of the annular cavity 5 is set to 0.1-1 mm, preferably 0.5 mm. In practical applications, the thickness of the annular cavity 5 can be arbitrarily selected within the range of 0.1-1 mm according to requirements.

[0043] In the embodiment of the present application, the piezoelectric ceramic module 3 includes a piezoelectric ceramic sheet 31 and an electrode sheet 32 ​​, and the piezoelectric ceramic sheet 31 is electrically connected to the electrode sheet 32 ​​.

[0044] Furthermore, a wire 7 is installed on the outer circumference of the cover body 11, the first end of the wire 7 is connected to the electrode sheet 32, and the second end of the wire 7 is connected to an external power supply. In order to make the arrangement of the wire 7 smooth and ensure the quality of glue injection, the first end of the wire is wrapped by a second waterproof covering layer 62, thereby realizing power supply to the transducer.

[0045] Furthermore, the wire is made of silicone material, which has a better bonding effect with the waterproof covering layer and can prevent the wire from falling off.

[0046] According to a waterproof transducer provided in an embodiment of the present application, the specific use process is as follows:

[0047] By injecting glue into a through hole of the injection ring through the injection molding machine and exhausting air through the remaining through holes, glue is first injected into the annular cavity inside the piezoelectric ceramic module, and then glue is injected into the outside of the piezoelectric ceramic module. This can achieve one-time glue injection inside and outside the transducer, so that the piezoelectric ceramic module is completely wrapped by the waterproof covering layer, ensuring the sealing and waterproof effect of the inside and outside of the transducer.

[0048] The applicant has verified through experiments that the more through holes there are, the easier it is to encapsulate the transducer. The entire encapsulation process takes about 3 to 5 minutes, while the traditional encapsulation process takes about 40 to 50 minutes, thereby improving the encapsulation efficiency.

[0049] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0050] The above description is only a detailed description of the preferred embodiments and principles of the present application. For ordinary technicians in this field, there will be changes in the specific implementation methods based on the ideas provided by the present application, and these changes should also be regarded as the scope of protection of the present application.

Claims

1. A waterproof transducer, characterized in that: It includes a rear cover plate, a front cover plate, a piezoelectric ceramic module and a glue injection ring. The piezoelectric ceramic module is installed between the front cover plate and the rear cover plate. The piezoelectric ceramic module is sleeved on the rear cover plate and forms an annular cavity with the rear cover plate. The glue injection ring is installed between the piezoelectric ceramic module and the rear cover plate. Several through holes are provided on the glue injection ring, and the through holes are connected to the annular cavity. The inner circumference and outer circumference of the piezoelectric ceramic module form a waterproof covering layer.

2. A waterproof transducer according to claim 1, characterized in that: The glue injection ring is provided with a plurality of through holes in a circumferential array, and the plurality of through holes are respectively configured as glue injection holes and exhaust holes.

3. A waterproof transducer according to claim 1, characterized in that: The rear cover plate includes a cover plate body and a connecting rod, one end of the connecting rod is built into the front cover plate and is threadedly matched with the front cover plate, a reserved gap is provided between the end of the front cover plate and the connecting rod, and the reserved gap is communicated with the annular cavity.

4. A waterproof transducer according to claim 3, characterized in that: A piezoelectric ceramic module and a glue injection ring are installed between the cover plate body and the front cover plate, and the piezoelectric ceramic module is tightly matched with the glue injection ring.

5. A waterproof transducer according to claim 3, characterized in that: The glue injection ring is sleeved on the connecting rod, and the inner wall of the glue injection ring is communicated with the annular cavity.

6. The waterproof transducer according to claim 1, characterized in that: The waterproof covering layer is wrapped around the inner and outer circumferences of the piezoelectric ceramic module to seal the piezoelectric ceramic module.

7. The waterproof transducer according to claim 1, characterized in that: The thickness of the annular cavity is set to 0.1-1 mm.

8. The waterproof transducer according to claim 1, characterized in that: The piezoelectric ceramic module includes a piezoelectric ceramic sheet and an electrode sheet, and the piezoelectric ceramic sheet is electrically connected to the electrode sheet.

9. The waterproof transducer according to claim 1, characterized in that: The waterproof covering layer is configured to include one or more of silicone, fluororubber, and nitrile rubber.

10. The waterproof transducer according to claim 1, characterized in that: The aperture of the through hole is set to 0.2-3 mm.

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