Surface acoustic wave filter based on temperature compensation

Abstract

The invention discloses a surface acoustic wave filter based on temperature compensation, which comprises a compensation limiting mechanism, a surface acoustic wave filter main body and a secondary compensation mechanism, and is characterized in that the compensation limiting mechanism comprises a fixed seat, a bearing plate, an air inlet pipeline, a bag body, a spring shock absorber, a second flow dividing box, a protective net, a clamping ring, a spray head and a one-way air inlet valve; the bearing plate is connected with a second flow dividing box through a bag body, a clamping ring is clamped to the bottom of the second flow dividing box, and a surface acoustic wave filter body is arranged at the bottom of the protective net. According to the surface acoustic wave filter based on temperature compensation, a worker can manually rotate a fixed seat and a screw rod connected with the bottom of the fixed seat, so that a protective net is pushed to move downwards to extrude the surface acoustic wave filter main body to limit the surface acoustic wave filter main body, and at the moment, pins at the top and the bottom and front, back, left and right side surfaces of the surface acoustic wave filter main body are in an unshielded state; in other words, external air flow can directly contact with the heat dissipation film, so that normal heat dissipation and temperature compensation can be guaranteed under the cooperation of the heat dissipation film.

Description

Technical Field

[0001] The invention relates to the technical field of surface acoustic wave filters, and in particular to a surface acoustic wave filter based on temperature compensation. Background Art

[0002] The main working principle of SAW filters (usually referred to as SAW) is to use the piezoelectric properties of piezoelectric materials and input and output transducers to convert the input signal of radio waves into mechanical energy. After processing, the mechanical energy is converted into electrical signals to filter out unnecessary signals and noise and improve the quality of signal reception. That is, its main function is to filter out noise. It is simpler to install and smaller in size than traditional LC filters. SAW filters and SAW resonators are widely used in various wireless communication systems, televisions, video recorders and global satellite positioning system receivers to replace LC resonant circuits for inter-stage coupling and filtering. SAW filters are easily affected by their own high temperature during use, so they need to be temperature compensated.

[0003] After searching, it is found that a typical SAW filter in the prior art is a temperature-compensated SAW filter with publication number CN215990726U, which includes a base, a placement slot running through the middle of the base, a filter installed inside the placement slot, a plurality of pins connected to the lower side of the filter, and a heat dissipation cavity connected to the placement slot and the outside is provided at both left and right ends inside the base, and heat conducting plates are equidistantly connected to one end of the two heat dissipation cavities close to the placement slot, and dustproof nets are clamped at the other ends of the two heat dissipation cavities, and a heat dissipation fan is provided between the dustproof net and the heat conducting plate; its main feature is to transfer the heat generated by the filter when it is working through the heat conducting plate, and then accelerate the air flow rate inside the heat dissipation cavity through the heat dissipation fan, thereby increasing the contact speed between the heat conducting plate and the air, accelerating the heat dissipation rate of the heat conducting plate, and then accelerating the heat dissipation rate of the filter, preventing damage to itself due to excessive temperature, and effectively increasing the service life of the SAW filter.

[0004] In summary, the existing SAW filter with temperature compensation function can only dissipate heat, i.e., perform temperature compensation, from the left and right directions due to the setting of the front and rear two sets of limiting structures, that is, there is a compensation dead angle, which makes the compensation efficiency low. In view of the above problems, the existing equipment needs to be improved. Summary of the invention

[0005] The purpose of the present invention is to provide a surface acoustic wave filter based on temperature compensation to solve the problem that the existing surface acoustic wave filter with temperature compensation function proposed in the above background technology can only dissipate heat, i.e., temperature compensation, from two directions due to the setting of two sets of front and rear limiting structures, that is, there is a compensation dead angle, resulting in low compensation efficiency.

[0006] To achieve the above object, the present invention provides the following technical solution: a surface acoustic wave filter based on temperature compensation, comprising a compensation limit mechanism, a surface acoustic wave filter body and a secondary compensation mechanism, The compensation limiting mechanism includes a fixed seat, a bearing plate, an intake pipe, a sac, a spring shock absorber, a second diverter box, a protective net, a retaining ring, a nozzle and a one-way intake valve, and the inner side of the fixed seat is connected to the bearing plate, the bearing plate is connected to the second diverter box through the sac, and the top of the sac is connected to the intake pipe, and the bottom of the sac is connected to the second diverter box through the one-way exhaust valve, the bottom of the second diverter box is engaged with a retaining ring, and the inner side of the retaining ring is connected to the protective net, the bottom of the protective net is provided with a surface acoustic filter body, and the bottom of the surface acoustic filter body is provided with pins.

[0007] Preferably, one end of the air intake pipe away from the sac body is arranged through the top of the fixing seat, and a one-way air intake valve is arranged on the air intake pipe.

[0008] Preferably, a spring shock absorber is arranged on the outer side of the bladder body, and the spring shock absorber and the bladder body are distributed in a ring array between the bottom of the bearing plate and the top of the second diverter box.

[0009] Preferably, the second diverter box is snap-connected with a snap ring, and the snap ring and the protective net are an integrated structure.

[0010] Preferably, the bottom of the second shunt box is provided with nozzles distributed in a ring array, and the nozzles are arranged on one side of the SAW filter body.

[0011] Preferably, the bottom of the SAW filter body contacts the upper surface of the support column, and heat-conducting frames are distributed in an annular array on the side wall of the support column, and the heat-conducting frames and the pins are staggered.

[0012] Preferably, the secondary compensation mechanism includes a heat-conducting seat, a water storage cavity, an inner heat-conducting plate, a heat-conducting column and an outer heat-conducting plate, and the heat-conducting seat is provided with a water storage cavity inside, the inner wall of the water storage cavity is provided with an inner heat-conducting plate, and the outer heat-conducting plate is provided on the outer wall of the water storage cavity, and the outer heat-conducting plate is connected to the heat-conducting seat through the heat-conducting column.

[0013] Preferably, the heat-conducting columns are arranged through the side wall of the water storage cavity, and are distributed in a ring array, and water-cooling liquid is arranged inside the water storage cavity.

[0014] Preferably, a limiting groove is provided on the top of the heat conducting seat, and a screw is threadedly connected in the limiting groove.

[0015] Preferably, the secondary compensation mechanism also includes a water inlet pipe, a sealing plug and a storage groove, and one end of the water inlet pipe is connected to the water storage chamber, and the other end of the water inlet pipe is connected to the sealing plug, the storage groove is opened at the center position of the heat conductive seat, and the inner side wall of the storage groove is connected to the support column through the heat conductive frame, and the support column, the heat conductive frame and the pins are all arranged inside the storage groove.

[0016] Compared with the prior art, the beneficial effects of the present invention are: the surface acoustic wave filter based on temperature compensation, (1) The present invention can effectively solve the problem that the existing SAW filter with temperature compensation function can only dissipate heat, i.e., temperature compensation, from the left and right directions due to the arrangement of the front and rear two sets of limit structures, i.e., there is a compensation dead angle, which makes the compensation efficiency low, by using the compensation limit mechanism and the screw rod in combination with the compensation limit mechanism and the screw rod. The staff can manually rotate the fixing seat and the screw rod connected to the bottom thereof to push the protective net downward to squeeze the SAW filter body to limit it. At this time, the pins at the top and bottom and the front, rear, left and right sides of the SAW filter body are all in an unobstructed state, i.e., the external airflow can directly contact it, thereby facilitating the protection of the SAW filter body with its own compensation film. In conjunction with normal heat dissipation for temperature compensation, on the other hand, when the SAW filter body or the electronic components installed around it vibrate, the capsule and the spring shock absorber are synchronously deformed, stretched and contracted for buffering. In addition, when the capsule is deformed, the airflow inside it is discharged to the inside of the second shunt box through the one-way exhaust valve, and is discharged to the side of the SAW filter body through the nozzle. Similarly, when the capsule and the spring shock absorber are synchronously deformed and stretched, the external airflow will enter the inside of the capsule through the air intake pipe due to the internal and external pressure difference, thereby ensuring that the capsule is indirectly pumped continuously for temperature compensation, and thereby speeding up the air circulation speed around it for temperature compensation, to prevent it from affecting normal operation due to high temperature; (2) The present invention can effectively solve the problem of low temperature compensation efficiency of a single structure by using a supporting column, a heat-conducting frame and a secondary compensation mechanism in combination. The supporting column in contact with the bottom of the SAW filter body conducts the heat emitted during operation to the heat-conducting seat through the heat-conducting frame, and at the same time, the water-cooling liquid inside the heat-conducting seat cools it. After absorbing the heat, the water-cooling liquid conducts the heat to the outer heat-conducting plate through the inner heat-conducting plate and the heat-conducting column, that is, the advantage of the large heat dissipation area of ​​the outer heat-conducting plate is used to perform volatile heat dissipation, that is, the air-cooling heat dissipation is assisted by the water-cooling heat dissipation and the heat-conducting sheet heat dissipation, thereby ensuring the quality of temperature compensation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an isometric view of a surface acoustic wave filter based on temperature compensation of the present invention; Figure 2 It is a schematic diagram of the overall explosion structure of a surface acoustic wave filter based on temperature compensation of the present invention; Figure 3It is a schematic diagram of the overall cross-sectional structure of a surface acoustic wave filter based on temperature compensation of the present invention; Figure 4 A surface acoustic wave filter based on temperature compensation of the present invention Figure 3 The enlarged structural diagram at A in the middle; Figure 5 A surface acoustic wave filter based on temperature compensation of the present invention Figure 3 The enlarged structural diagram at B in the middle; Figure 6 It is an isometric view of a surface acoustic wave filter based on temperature compensation according to the present invention.

[0018] In the figure: 1. compensation and limiting mechanism; 101. fixing seat; 102. bearing plate; 103. air intake pipe; 104. bladder; 105. spring shock absorber; 106. second diversion box; 107. protection net; 108. retaining ring; 109. nozzle; 1010. one-way air intake valve; 2. SAW filter body; 3. pin; 4. support column; 5. heat conducting frame; 6. secondary compensation mechanism; 601. heat conducting seat; 602. water storage chamber; 603. inner heat conducting plate; 604. heat conducting column; 605. outer heat conducting plate; 606. water inlet pipe; 607. sealing plug; 608. storage slot; 7. screw; 8. limiting slot. DETAILED DESCRIPTION

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

[0020] See also Figure 1-6 The present invention provides a technical solution: a surface acoustic wave filter based on temperature compensation, Embodiment 1 like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 6As shown, the compensation limit mechanism 1 includes a fixed seat 101, a bearing plate 102, an air intake pipe 103, a capsule 104, a spring shock absorber 105, a second shunt box 106, a protective net 107, a clamping ring 108, a nozzle 109 and a one-way air intake valve 1010, and the inner side of the fixed seat 101 is connected with the bearing plate 102, the bearing plate 102 is connected to the second shunt box 106 through the capsule 104, and the top of the capsule 104 is connected with the air intake pipe 103, and the bottom of the capsule 104 is connected to the second shunt box 106 through the one-way exhaust valve, the bottom of the second shunt box 106 is clamped with a clamping ring 108, and the inner side of the clamping ring 108 is connected with the protective net 107, the bottom of the protective net 107 is provided with a sound surface filter body 2, and the bottom of the sound surface filter body 2 is provided with a pin 3 In a further embodiment, one end of the air intake pipe 103 away from the bladder 104 is arranged through the top of the fixing seat 101 , and a one-way air intake valve 1010 is arranged on the air intake pipe 103 .

[0021] In a further embodiment, a spring damper 105 is disposed outside the bladder 104 , and the spring damper 105 and the bladder 104 are distributed in a circular array between the bottom of the bearing plate 102 and the top of the second diverter box 106 .

[0022] In a further embodiment, the second diverter box 106 is engaged with the clamping ring 108 , and the clamping ring 108 and the protective net 107 are an integrated structure.

[0023] In a further embodiment, the bottom of the second diverter box 106 is provided with nozzles 109 in a circular array, and the nozzles 109 are arranged on one side of the SAW filter body 2 .

[0024] In a further embodiment, the bottom of the SAW filter body 2 contacts the upper surface of the support column 4 , and the heat-conducting frames 5 are distributed in a circular array on the side wall of the support column 4 , and the heat-conducting frames 5 and the pins 3 are staggered.

[0025] Specifically, in the actual working process, the SAW filter body 2 is first placed on the top of the support column 4. At this time, the pin 3 at the bottom of the SAW filter body 2 is penetrated and arranged in the analysis of the heat-conducting frame 5. Then the staff manually rotates the fixing seat 101 so that the screw 7 at the bottom thereof is threadedly connected to the inside of the limiting groove 8, and the protective net 107 on the inner side of the fixing seat 101 gradually contacts the top of the SAW filter body 2 during the process of rotating downward, that is, the SAW filter body 2 is fixed between the support column 4 and the protective net 107, and thereby the position of the SAW filter body 2 is fixed. When the SAW filter body 2 or the electronic components installed around it vibrate, the capsule 104 and the spring shock absorber 105 are synchronously deformed, stretched and contracted for buffering. In addition, when the capsule 104 is deformed, its The internal air flow is discharged to the interior of the second diversion box 106 through the one-way exhaust valve, and is discharged to the side of the SAW filter body 2 through the nozzle 109. Similarly, when the external air flow is synchronously deformed and stretched in the bladder 104 and the spring shock absorber 105, the internal and external pressure difference will enter the interior of the bladder 104 through the air intake pipe 103, thereby ensuring that the bladder 104 is indirectly and continuously pumped for temperature compensation, and thereby speeding up the air circulation speed around it for temperature compensation, thereby avoiding affecting its normal operation due to high temperature; on the other hand, after limiting, the pins 3 at the top and bottom, as well as the front, back, left and right sides of the SAW filter body 2 are in an unobstructed state, that is, the external air flow can directly contact it, thereby ensuring that it can dissipate heat normally for temperature compensation with the cooperation of its own compensation film.

[0026] Embodiment 2 This embodiment is a further description of the above embodiment. It should be understood that this embodiment includes all the aforementioned technical features and is further described in detail.

[0027] like Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, in a further embodiment, the secondary compensation mechanism 6 includes a heat-conducting seat 601, a water storage cavity 602, an inner heat-conducting plate 603, a heat-conducting column 604 and an outer heat-conducting plate 605, and a water storage cavity 602 is opened inside the heat-conducting seat 601, an inner heat-conducting plate 603 is arranged on the inner wall of the water storage cavity 602, and an outer heat-conducting plate 605 is arranged on the outer wall of the water storage cavity 602, and the outer heat-conducting plate 605 is connected to the heat-conducting seat 601 through the heat-conducting column 604.

[0028] In a further embodiment, the heat-conducting columns 604 are disposed through the side wall of the water storage cavity 602 , and the heat-conducting columns 604 are distributed in a ring array, and water-cooling liquid is disposed inside the water storage cavity 602 .

[0029] In a further embodiment, a limiting groove 8 is provided on the top of the heat conducting seat 601 , and a screw 7 is threadedly connected to the limiting groove 8 .

[0030] In a further embodiment, the secondary compensation mechanism 6 also includes a water inlet pipe 606, a sealing plug 607 and a storage groove 608, and one end of the water inlet pipe 606 is connected to the water storage chamber 602, and the other end of the water inlet pipe 606 is connected to the sealing plug 607, the storage groove 608 is opened at the center position of the thermal conductive seat 601, and the inner side wall of the storage groove 608 is connected to the support column 4 through the thermal conductive frame 5, and the support column 4, the thermal conductive frame 5 and the pin 3 are all arranged inside the storage groove 608.

[0031] Specifically, the heat generated by the SAW filter body 2 during operation is transferred to the heat-conducting seat 601 through the heat-conducting frame 5 via the support column 4 in contact with the bottom, and the water-cooling liquid inside the heat-conducting seat 601 cools it down at the same time, thereby achieving temperature compensation. Secondly, the water-cooling liquid after absorbing heat transfers the heat to the outer heat-conducting plate 605 through the inner heat-conducting plate 603 and the heat-conducting column 604, that is, the advantage of the large heat dissipation area of ​​the outer heat-conducting plate 605 is used for volatile heat dissipation, that is, water cooling and heat dissipation of the heat conductive sheet are used to assist the air cooling, thereby ensuring the quality and continuity of the temperature compensation.

[0032] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A surface acoustic wave filter based on temperature compensation, comprising a compensation limit mechanism (1), a surface acoustic wave filter body (2) and a secondary compensation mechanism (6), characterized in that: The compensating limit mechanism (1) comprises a fixing seat (101), a bearing plate (102), an air intake pipe (103), a capsule (104), a spring shock absorber (105), a second flow diversion box (106), a protective net (107), a clamping ring (108), a nozzle (109) and a one-way air intake valve (1010), wherein the inner side of the fixing seat (101) is connected to the bearing plate (102), and the bearing plate (102) is connected to the second flow diversion box (106) via the capsule (104). 6), and the top of the sac (104) is connected to an air intake pipe (103), and the bottom of the sac (104) is connected to a second shunt box (106) via a one-way exhaust valve, a clamping ring (108) is engaged at the bottom of the second shunt box (106), and a protective net (107) is connected to the inner side of the clamping ring (108), a surface acoustic filter body (2) is arranged at the bottom of the protective net (107), and a pin (3) is arranged at the bottom of the surface acoustic filter body (2).

2. A temperature-compensated surface acoustic wave filter according to claim 1, characterized in that: One end of the air intake pipe (103) away from the sac body (104) is arranged to penetrate the top of the fixing seat (101), and a one-way air intake valve (1010) is arranged on the air intake pipe (103).

3. The temperature-compensated surface acoustic wave filter according to claim 1, characterized in that: A spring damper (105) is arranged on the outside of the capsule (104), and the spring damper (105) and the capsule (104) are distributed in a ring array between the bottom of the bearing plate (102) and the top of the second diversion box (106).

4. The temperature-compensated surface acoustic wave filter according to claim 1, characterized in that: The second diverter box (106) is snap-connected with the clamp ring (108), and the clamp ring (108) and the protective net (107) are an integrated structure.

5. The temperature-compensated surface acoustic wave filter according to claim 1, characterized in that: The bottom of the second diversion box (106) is provided with nozzles (109) distributed in a ring array, and the nozzles (109) are arranged on one side of the surface acoustic wave filter body (2).

6. The temperature-compensated surface acoustic wave filter according to claim 1, characterized in that: The bottom of the surface acoustic filter body (2) contacts the upper surface of the support column (4), and heat-conducting frames (5) are distributed in a circular array on the side wall of the support column (4), and the heat-conducting frames (5) and the pins (3) are arranged in an alternating manner.

7. The temperature-compensated surface acoustic wave filter according to claim 1, characterized in that: The secondary compensation mechanism (6) comprises a heat conducting seat (601), a water storage cavity (602), an inner heat conducting plate (603), a heat conducting column (604) and an outer heat conducting plate (605), wherein the heat conducting seat (601) is provided with a water storage cavity (602), an inner heat conducting plate (603) is arranged on the inner wall of the water storage cavity (602), and an outer heat conducting plate (605) is arranged on the outer wall of the water storage cavity (602), and the outer heat conducting plate (605) is connected to the heat conducting seat (601) via the heat conducting column (604).

8. The temperature-compensated surface acoustic wave filter according to claim 7, characterized in that: A limiting groove (8) is provided on the top of the heat conducting seat (601), and a screw rod (7) is connected to the inner thread of the limiting groove (8).

9. The temperature-compensated surface acoustic wave filter according to claim 7, characterized in that: The heat-conducting columns (604) are arranged through the side wall of the water storage cavity (602), and the heat-conducting columns (604) are distributed in a ring array. Meanwhile, water-cooling liquid is arranged inside the water storage cavity (602).

10. The temperature-compensated surface acoustic wave filter according to claim 1, characterized in that: The secondary compensation mechanism (6) further comprises a water inlet pipe (606), a sealing plug (607) and a storage groove (608), wherein one end of the water inlet pipe (606) is in communication with the water storage chamber (602), and the other end of the water inlet pipe (606) is connected to the sealing plug (607); the storage groove (608) is arranged at the center of the heat-conducting seat (601), and the inner side wall of the storage groove (608) is connected to the support column (4) via the heat-conducting frame (5); and the support column (4), the heat-conducting frame (5) and the pin (3) are all arranged inside the storage groove (608).

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