High-pulse-resistant high-frequency radio-frequency power resistor

Abstract

The invention relates to the technical field of resistors, in particular to a high-pulse-resistant high-frequency radio-frequency power resistor which comprises a resistor body, a base, an output shell and a connecting ring, the resistor body comprises an insulating framework, a resistance wire and a packaging material, the resistance wire is wound on the outer wall of the insulating framework, and the resistance wire and the insulating framework are wrapped with the packaging material. A base is connected to the insulating framework, an output shell is connected to the center of the base and the edge of the base, a sliding hole is formed in the output shell, a connecting ring is arranged in the sliding hole, the connecting ring is located in a gap between the connecting ring and the output shell and is made of a flexible conductive material, and an extrusion assembly is arranged in the sliding hole. According to the welding device, the driving block is heated through high temperature during welding, the connecting ring is pushed and extruded, the length of the connecting ring is shortened, the size in the radial direction is increased, the connecting ring is connected with the output shell and the input pin, and the pin is electrically connected with the resistance wire.

Description

Technical Field

[0001] The invention relates to the technical field of resistors, in particular to a high-pulse high-frequency radio frequency power resistor. Background Art

[0002] In the fields of electronic communications, meteorological monitoring, aviation control, etc., the circuit has high-frequency radio frequency characteristics and high pulse power characteristics. When a medium with one impedance is transmitted to a medium with another impedance in the line, since the impedances of the two are not equal, signal reflection and loss will occur, which will damage the signal integrity. In order to avoid signal reflection and loss, the circuit must be impedance matched, and resistors must be connected in the line. By reasonably setting the resistance value, the signal can be matched at the starting end of the transmission line to reduce reflection. In the line of high pulse high-frequency radio frequency power, non-inductive winding resistors will be selected for impedance matching. Non-inductive winding resistors use special winding processes on the insulation resistance of the resistor wire, such as double-wire parallel winding and reverse winding, so that the magnetic fields generated by the current cancel each other out, reduce the inductive reactance value to an extremely low level, reduce the adverse effects of inductance on the circuit in the high-frequency circuit, and use metal wire windings to withstand higher power. In the prior art, the installation of the winding resistor connects the pins at both ends of the resistor to the circuit board by tinning. During the process, false welding or cold welding may occur. At the same time, the welding area is small, and the solder joints are desoldered during the use of the equipment, which will cause product failure.

[0003] In response to the above problems, the prior art provides a solution. For example, patent application number CN201820979998.8 provides a surface mounted wire-wound resistor with improved welding performance. The patent provides a solution including a surface mounted wire-wound resistor. The surface mounted wire-wound resistor is a cylindrical structure. Conductive caps are fixedly sleeved at both ends of the surface mounted wire-wound resistor. The conductive caps are a cylindrical structure, and the outer circle of the conductive caps is provided with concave and convex portions. The utility model discloses a mounted wire-wound resistor with improved welding performance. A concave-convex portion for increasing the surface area of ​​the conductive cap of the mounted wire-wound resistor is arranged on the outer circle of the conductive cap, and the concave-convex portion can increase the contact area of ​​the solder between the soldering pad and the conductive cap when the conductive cap is soldered to the soldering pad on the circuit board. The solder can firmly solidify the conductive cap on the soldering pad, reduce its contact resistance, and improve its conductivity. The problem of desoldering is not easy to occur in long-term use, and the defect rate of the equipment or product using the mounted wire-wound resistor is reduced. When the conductive cap is welded, since the core of the wire-wound resistor is a resistance wire wound on an insulating skeleton, the resistance wire is directly connected to the pin, and the thermal expansion coefficients of the materials of the components such as the resistance wire, the insulating skeleton and the pin are different, when the resistor is soldered, the high temperature of the solder is transmitted to the wire-wound resistor, and the expansion degrees of the components are inconsistent when heated, thereby causing the winding position and arrangement of the resistance wire to change, breaking the inductance balance in the wire-wound resistor, and the phase shift caused by the inductance imbalance leads to data transmission errors. Summary of the invention

[0004] The purpose of the present invention is to provide a high-pulse high-frequency radio frequency power resistor to solve the problem that when welding the conductive cap, the high temperature of the solder is transferred to the wound resistor, and the thermal expansion coefficients of the materials of the resistance wire, the insulating frame and the pins are different. When heated, their expansion degrees are inconsistent, which leads to changes in the winding position and arrangement of the resistance wire, breaking the inductance balance in the wound resistor, and the phase shift caused by the inductance imbalance leads to data transmission errors.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A high-pulse high-frequency radio frequency power resistor, characterized in that it includes a resistor body, a pin, a base, an input pin, an output shell and a connecting ring, wherein the resistor body is connected with pins at both ends, the resistor body includes an insulating skeleton, a resistance wire and a packaging material, the outer wall of the insulating skeleton is surrounded by a resistance wire, the resistance wire and the insulating skeleton are wrapped with packaging material, the insulating skeleton is connected with a base, the base is made of a heat-insulating material, the center of the base is connected with an input pin, the edge of the base is connected with an output shell, the pin is installed on the output shell, the output shell is electrically connected to the pin, the input pin is electrically connected to the resistance wire, a sliding hole is opened inside the output shell, a connecting ring is arranged inside the sliding hole, the connecting ring is located inside the gap between the input pin and the output shell, the connecting ring is made of a flexible conductive material, an extrusion component is arranged inside the sliding hole, and the extrusion component connects the connecting ring to the input pin and the output shell respectively through thermal expansion,

[0007] It is easy to understand that when installing the resistor, the pins are spot-soldered to the circuit board. During the process, since the core of the resistor body is the resistance wire wound on the insulating frame, the resistance wire is directly connected to the pins, and the thermal expansion coefficients of the materials of the resistance wire, insulating frame and pins are different, when the resistor is soldered, the high temperature of the solder is transmitted to the wound resistor, and their expansion degrees are inconsistent when heated, which causes the winding position and arrangement of the resistance wire to change, breaking the inductance balance in the wound resistor. Inductance imbalance can cause data errors. Therefore, a base is designed at the connection between the resistor body and the pin. The base is made of heat-insulating material. When the high temperature of the solder on the pin is transmitted to the output shell, it is isolated by the base, thereby avoiding the heat on the pin from being transmitted to the resistor body through the output shell.

[0008] Furthermore, the heat on the output shell is conducted to the extrusion component in the sliding hole. The extrusion component expands due to the heat and pushes the connecting ring to slide in the sliding hole. One end of the connecting ring contacts the base. With the push of the driving block, both ends of the connecting ring are squeezed. With the clearance fit, the connecting ring moves in the sliding hole. When one end of the connecting ring contacts the base, with the push of the driving block, both ends of the connecting ring are squeezed. Since the connecting ring is made of conductive material, the length of the connecting ring is shortened and the radial dimension is increased. At this time, both sides of the connecting ring are connected to the input pin and the output shell to achieve electrical connection between the pin and the resistor wire. By setting the position of the connecting ring, the input pin and the output shell, the high temperature of the solder on the pin is prevented from being directly transferred to the resistor body, thereby causing the winding position and arrangement of the resistor wire to change, resulting in data errors, thereby ensuring the stability of the resistance value and the measurement accuracy.

[0009] At the same time, since the connecting ring is made of conductive sponge and flexible conductive material, it has good conductivity, high elasticity, softness and electromagnetic shielding, etc., it can ensure good electrical connection while avoiding collision and extrusion during installation and use, and play a role in vibration reduction and offsetting stress concentration.

[0010] Preferably, the extrusion assembly includes a driving block, which is located inside the sliding hole and fits inside the driving block input shell. The connecting ring includes a supporting part and a connecting part. The supporting part is slidably connected to the driving block. The connecting part is coaxially provided with a connecting hole. The driving block is made of a mixture of epoxy resin, zinc powder and ammonium salt.

[0011] The drive block is made of a mixture of epoxy resin, zinc powder and ammonium salt. When heated, the epoxy resin will gradually soften and flow during the heating process. The zinc powder reacts with oxygen in the air under high temperature conditions to generate zinc oxide. The ammonium salt can reduce the starting temperature of the zinc powder oxidation reaction, so that the reaction can be carried out at a lower temperature. As the zinc powder oxidation reaction proceeds, the volume of the generated zinc oxide increases. At the same time, the heat released by the reaction prompts the epoxy resin to further soften and expand. The generation of gas inside the material also causes its volume to increase multiples, pushing the connecting ring coaxially installed in the sliding hole to move, and utilizing the heat generated during welding to conduct to the drive block in the sliding hole to cause it to react and expand, thereby pushing the support to extrude the connecting part.

[0012] Preferably, a No. 1 snap ring is coaxially provided on the outer wall of the input pin, a No. 2 snap ring is coaxially provided in the sliding hole, the No. 1 snap ring and the No. 2 snap ring are in the same radial plane, a snap groove is coaxially provided at the connection between the support part and the connecting part, and the No. 1 snap ring and the No. 2 snap ring respectively cooperate with the snap grooves on the support part and the connecting part.

[0013] During the installation and use of the connecting ring, jitter occurs. At the same time, the elastic potential energy of the connecting ring generated by extrusion is released, resulting in an unstable connection between the connecting ring, the output shell and the input pin, causing line interruption or resistance change, which leads to signal distortion and reduced accuracy in the circuit. Therefore, a No. 1 clamping ring and a No. 2 clamping ring are respectively provided on the outer wall of the input pin and in the sliding hole, and the No. 1 clamping ring and the No. 2 clamping ring are on the same radial plane. A clamping groove is coaxially provided at the connection between the support part and the connecting part. When the driving block squeezes the connecting ring, the connecting part is deformed. At this time, the axial length of the connecting part is shortened and the clamping groove slides. To the same plane of the No. 1 and No. 2 snap rings, and at the same time the radial dimension increases. At this time, the No. 1 and No. 2 snap rings cooperate with the grooves on the supporting part and the connecting part respectively. The No. 1 and No. 2 snap rings limit the position of the connecting part in the axial direction. By using the No. 1 and No. 2 snap rings to limit the position of the connecting part in the axial direction, jitter is avoided during installation and use, which leads to unstable connection between the connecting ring and the output shell and the input pin, resulting in line interruption or change in resistance value, resulting in signal distortion and reduced accuracy in the circuit, thereby ensuring the stability of the resistance value.

[0014] Preferably, a plurality of No. 1 bosses are provided in a ring shape on the input pin, an input layer is provided on the upper end of the No. 1 boss, the input layer is electrically connected to the resistance wire, the No. 1 boss is parallel to the axis of the input pin, a No. 2 boss is provided in a ring shape inside the sliding hole, an output layer is provided on the No. 2 boss, the output layer is electrically connected to the pin, the No. 2 boss is parallel to the axis of the sliding hole, and the length of the input layer is equal to the thickness and length of the output layer.

[0015] When the connecting part is squeezed, the radial dimension increases, and the axial dimension of the connecting part changes to be high in the middle and low at both ends. At this time, the high part first contacts the inner wall of the sliding hole and the outer wall of the input pin respectively. Under the restriction of the inner wall of the sliding hole and the outer wall of the input pin and the push of the driving block, the first contact in the middle of the contact part transitions to the two ends. There will be gaps at both ends of the connecting part, and it is impossible to make an electrical connection with the input pin and the inner wall of the sliding hole. Due to the difference in the inner and outer diameters of the connecting part, the width of the gap on both sides cannot be controlled, so the contact surface areas on both sides are not equal, which affects the accuracy of the resistance value. Therefore, A No. 1 boss and a No. 2 boss are arranged on the inner wall of the pin and the sliding hole, and the input layer and the output layer on the No. 1 boss and the No. 2 boss are of equal thickness. When the connecting part is squeezed and deformed, the side walls on both sides are covered on the No. 1 boss and the No. 2 boss. By designing that the input layer and the output layer on the No. 1 boss and the No. 2 boss are of equal thickness, the side walls on both sides of the connecting part that are squeezed and deformed are covered on the input layer and the output layer, so that the electrical contact surface areas on both sides are equal, avoiding the problem of unequal contact surface areas on both sides of the connecting part, thereby affecting the accuracy of the resistance value, and ensuring the accuracy of the resistance value.

[0016] Preferably, the cross-sections of the No. 1 boss and the No. 2 boss in the radial direction are trapezoidal, the large end of the No. 1 boss is connected to the input pin, and the input layer is located on the small end of the No. 1 boss, the large end of the No. 2 boss is connected to the output shell, and the output layer is located on the small end of the No. 2 boss, the outer wall of the connecting portion is annularly provided with a plurality of No. 2 grooves, and the inner wall of the connecting hole is annularly provided with a plurality of No. 1 grooves, the cross-sections of the No. 1 groove and the No. 2 groove in the radial direction are trapezoidal, the inner and outer walls of the connecting portion of the No. 1 groove and the large end of the No. 2 groove are connected, the number of the No. 1 grooves is equal to the number of the No. 1 boss, and the two cooperate with each other, the number of the No. 2 grooves is equal to the number of the No. 2 bosses, and the two cooperate with each other.

[0017] During the use of the resistor, the input pin and the connecting part will generate heat, which needs to be conducted to the surface of the output shell for heat dissipation by means of heat transfer. When the connecting part is connected to the No. 1 boss and the No. 2 boss, there will be a gap at the bottom of the adjacent bosses. The gap will hinder the heat transfer between the input pin, the connecting part and the output shell. The continuous accumulation of heat will shorten the service life of the resistor. Therefore, a plurality of No. 2 grooves and No. 1 grooves are respectively provided in an annular manner on the outer wall of the connecting part and the inner wall of the connecting hole, and the two are matched with each other. When the connecting part is squeezed and expanded to both sides, the No. 1 groove fits with the No. 1 boss, and the No. 2 groove fits with the No. 2 boss. The No. 1 groove and the No. 2 groove fit with the No. 1 boss and the No. 2 boss respectively, thereby avoiding the problem that there will be a gap at the bottom of the adjacent bosses that hinders the heat transfer between the input pin, the connecting part and the output shell, thereby shortening the service life of the resistor.

[0018] Furthermore, by designing the radial cross-sections of boss No. 1, boss No. 2, groove No. 1 and groove No. 2 to be trapezoidal, during the extrusion and expansion process of the connecting portion, the interaction between the inclined surfaces on both sides of the trapezoid is utilized, which facilitates the cooperation between groove No. 1 and groove No. 2 and boss No. 1 and boss No. 2 respectively, thereby ensuring the fit between the boss and the groove.

[0019] Preferably, a sealing ring is coaxially installed in the sliding hole, the inner diameter of the sealing ring is slidably connected to the support part, the outer diameter of the sealing ring is slidably connected to the sliding hole, both ends of the sealing ring are respectively connected to the driving block and the card slot, the sealing ring is made of flexible material, one end of the sealing ring close to the card slot is provided with a No. 2 inclined surface, the No. 2 card ring is provided with a No. 1 inclined surface, the No. 1 inclined surface and the No. 2 inclined surface are parallel, an exhaust hole is provided in the card slot, the exhaust hole connects the inner wall and the outer wall of the connecting part, an exhaust groove is provided on the outer wall of the sealing ring, the exhaust groove is arranged parallel to the axis of the support part, and the exhaust groove runs through the sealing ring.

[0020] When the driving block pushes the connecting ring, a closed space is formed between the connecting hole and the end face of the input pin. During the movement of the connecting ring, the gas in the closed space is compressed, and the gas will enter the gap between the inner wall of the connecting part and the input pin. The gas will hinder the fitting of the No. 1 boss on the input pin and the connecting part, thereby affecting the resistance value of the resistor. Therefore, an exhaust hole is opened in the slot, and the exhaust hole connects the inner wall and the outer wall of the connecting part. An exhaust groove is opened on the outer wall of the sealing ring, and the exhaust groove runs through the sealing ring. During the movement of the connecting ring, the gas in the closed space passes through the exhaust hole to the slot, and the gas in the slot passes through the exhaust groove to the sliding hole of the driving block, thereby preventing the gas from entering the gap between the inner wall of the connecting part and the input pin, hindering the fitting of the No. 1 boss and the connecting part, thereby affecting the resistance value of the resistor.

[0021] Furthermore, when the drive block expands due to heat, some epoxy resin and zinc powder will pass through the gap between the support block and the sliding hole to the surface of the connecting part and the No. 2 boss, which will hinder the connection between the connecting part and the boss, making the resistor unusable. Therefore, a sealing ring is coaxially slidably installed on the support part. When the drive block drives the connecting ring to move forward, it also brings the sealing ring with it. When the No. 1 clamping ring and the No. 2 clamping ring cooperate with the slot, the No. 1 inclined surface of the sealing ring is pushed by the drive block to fit with the No. 2 inclined surface. When the drive block continues to push, and under the guidance of the No. 1 inclined surface, the sealing ring is squeezed along the inclined surface to enter the slot. The sealing ring is made of rubber and has good flexibility and deformability. As the drive block is continuously squeezed, the sealing ring is deformed in the slot and continuously accumulates to fill the slot. By using the drive block to push the sealing ring to fill the slot, epoxy resin and zinc powder are prevented from passing through the gap between the support block and the sliding hole to the surface of the connecting part and the No. 2 boss, which will hinder the connection between the connecting part and the boss, making the resistor unusable.

[0022] Furthermore, by discharging the gas in the sealed space into the sliding hole of the driving block, the oxygen in the air is allowed to participate in the oxidation reaction of zinc, so that the zinc can be fully oxidized. At the same time, under the push of the driving block, the second inclined surface on the sealing ring fits with the first inclined surface. The sealing ring is closed through the fitting of the second inclined surface and the first inclined surface and the extrusion deformation of the sealing ring to prevent the backflow of gas.

[0023] Preferably, the connecting portion is coaxially symmetrically provided with a plurality of groove rings, the groove rings are respectively located at the inner walls at both ends of the connecting hole and the outer walls at both ends of the connecting hole, and the cross-section of the groove ring is triangular.

[0024] When the connecting part is squeezed, there is stress concentration on the inner side of the bending part due to the bending at both ends of the connecting part, which will limit the No. 1 groove and the No. 2 groove from fitting respectively with the No. 1 boss and the No. 2 boss, and the connecting part cannot be tightly connected with the output layer and the input layer, which will affect the resistance value and heat dissipation problem. Therefore, a plurality of groove rings are coaxially symmetrically provided on the connecting part, and the groove rings are respectively located on the inner walls at both ends of the connecting hole and the outer walls at both ends of the connecting bad. The cross-section of the groove ring is triangular. By opening the triangular groove ring at the bending part, the stress can be effectively dispersed, thereby avoiding the stress concentration on the inner side of the bending part affecting the resistance value and heat dissipation problem, and ensuring the accuracy of the resistance value.

[0025] Preferably, the sliding inner wall and the input pin surface are sandblasted, the pressure range of the sandblasting is 0.2-0.7PMa, the surface roughness of the product after sandblasting is 1-10μm, and a plurality of guide grooves are provided on one side of the output shell and the pin, the guide grooves are vertically arranged, and the width of the guide grooves is 0.1-1mm.

[0026] During the operation of the equipment, even if it is affected by factors such as vibration and thermal expansion, and in high-pulse and high-frequency circuits, the conductive stability requirements are extremely high, which will affect the connection between the connecting part and the sliding inner wall and the input pin surface. By performing reasonable sandblasting on the sliding inner wall and the input pin surface, when the connecting part contacts the sliding inner wall and the input pin surface, it is not only a simple physical contact, but also a mechanical bite effect. This mechanical bite makes the connection between the conductors more firm and stable, ensuring the stability of the conductive path.

[0027] Furthermore, uneven heating of the drive block will cause insufficient reaction, resulting in deviation when pushing the connecting ring, which in turn affects the resistance value of the resistor. A guide groove with a width of 0.1-1mm is opened on the output shell. The welding liquid is guided to the side of the entire output shell through the guide groove, so that the heat of the welding liquid is conducted to the drive block through the output shell shell, so that the drive block can be heated evenly, avoiding the problem of uneven heating of the drive block affecting the resistance value of the resistor.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The present invention utilizes the high temperature during pin welding to heat the driving block and push the connecting ring through the cooperation between the connecting ring, the output shell and the input pin. The two ends of the connecting ring are squeezed and deformed, the length of the connecting ring is shortened, and the radial dimension is increased to connect with the output shell and the input pin, so as to realize the electrical connection between the pin and the resistance wire, avoid the high temperature of the solder being transferred to the resistor body, thereby causing the winding position and arrangement of the resistance wire to change and cause data errors, and ensure the stability of the resistance value and the measurement accuracy.

[0030] 2. The present invention avoids unequal contact surface areas on both sides of the connection part, which affects the accuracy of the resistance value, and ensures the stability of the resistance value and the measurement accuracy, by designing the input layer and the output layer to be equal in length and thickness, and at the same time, the No. 1 groove and the No. 2 groove are respectively fitted with the No. 1 boss and the No. 2 boss, to avoid the problem that when the connection part expands, there will be gaps at the bottom of adjacent bosses to hinder the heat transfer between the input pin, the connection part and the output shell, thereby shortening the service life of the resistor.

[0031] 3. The present invention, through the design of the exhaust hole and the sealing ring, allows the gas in the closed space formed by the end face of the connecting hole and the input pin to pass through the exhaust hole, the card slot and the exhaust groove to the sliding hole where the driving block is located, and then participate in the oxidation reaction of zinc, thereby preventing the gas from entering the gap between the inner wall of the connecting part and the input pin, hindering the cooperation between the boss and the connecting part, and thus affecting the resistance value of the resistor. By using the driving block to push the sealing ring to fill the card slot, it is prevented that epoxy resin and zinc powder pass through the gap between the support block and the sliding hole to reach the surface of the connecting part and the second boss, which will hinder the electrical connection between the connecting part and the boss. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the high pulse high frequency radio frequency power resistor of the present invention;

[0033] Figure 2 It is a schematic diagram of the explosion of the high pulse high frequency radio frequency power resistor of the present invention;

[0034] Figure 3 It is an overall cross-sectional view of the high pulse high frequency radio frequency power resistor of the present invention;

[0035] Figure 4 For the present invention Figure 3 The local enlarged separation diagram at A in the middle;

[0036] Figure 5 For the present invention Figure 3 The local enlarged connection diagram at A in the middle;

[0037] Figure 6 It is a schematic diagram of the structure of the resistor body and the input pin of the present invention;

[0038] Figure 7 A sectional axial view of the input shell and pins of the present invention;

[0039] Figure 8 It is a cross-sectional axial view of the connecting ring of the present invention;

[0040] Fig. 9 It is a schematic structural diagram of the sealing ring of the present invention.

[0041] In the figure: 1. resistor body; 11. insulating skeleton; 12. resistor wire; 13. packaging material; 2. pin; 31. base; 32. input pin; 321. No. 1 retaining ring; 322. No. 1 boss; 323. input layer; 33. connecting ring; 331. connecting hole; 332. supporting part; 333. connecting part; 3331. No. 2 groove; 3332. No. 1 groove; 3333. groove ring; 3334. exhaust hole; 334. retaining groove; 34. driving block; 35. output shell; 351. No. 2 boss; 352. output layer; 353. No. 2 retaining ring; 3531. No. 1 inclined surface; 354. guide groove; 355. sliding hole; 36. sealing ring; 361. No. 2 inclined surface; 362. exhaust groove. DETAILED DESCRIPTION

[0042] See also Figures 1 to 9 The present invention provides a high pulse high frequency radio frequency power resistor, and the technical solution is as follows:

[0043] A high pulse high frequency radio frequency power resistor, comprising a resistor body 1, a pin 2, a base 31, an input pin 32, an output shell 35 and a connecting ring 33, wherein the pins 2 are connected to both ends of the resistor body 1, the resistor body 1 comprises an insulating frame 11, a resistance wire 12 and a packaging material 13, the outer wall of the insulating frame 11 is surrounded by the resistance wire 12, the resistance wire 12 and the insulating frame 11 are wrapped with the packaging material 13, the insulating frame 11 is connected to the base 31, the base 31 is made of a heat insulating material, the center of the base 31 is connected to the input pin 32, the edge of the base 31 is connected to the output shell 35, the pin 2 is installed on the output shell 35, and the output shell 35 is connected to the output shell 35. 5 is electrically connected to the pin 2, the input pin 32 is electrically connected to the resistance wire 12, a sliding hole 355 is opened inside the output shell 35, a connecting ring 33 is arranged inside the sliding hole 355, the connecting ring 33 is located inside the gap between the input pin 32 and the output shell 35, the connecting ring 33 is made of flexible conductive material, the connecting portion 333 is coaxially symmetrically provided with a plurality of groove rings 3333, the groove rings 3333 are respectively located at the inner walls at both ends of the connecting hole 331 and the outer walls at both ends of the connecting bad, the cross section of the groove ring 3333 is triangular, an extrusion component is arranged inside the sliding hole 355, and the extrusion component connects the connecting ring 33 to the input pin 32 and the output shell 35 respectively through thermal expansion.

[0044] See also Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 7 The extrusion assembly includes a driving block 34, which is located inside the sliding hole 355 and fits inside the input shell. The connecting ring 33 includes a supporting portion 332 and a connecting portion 333. The supporting portion 332 is slidably connected to the driving block 34. The connecting portion 333 is coaxially provided with a connecting hole 331. The driving block 34 is made of a mixture of epoxy resin, zinc powder and ammonium salt.

[0045] See also Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 A first snap ring 321 is coaxially provided on the outer wall of the input pin 32, a second snap ring 353 is coaxially provided in the sliding hole 355, the first snap ring 321 and the second snap ring 353 are in the same radial plane, a snap groove 334 is coaxially provided at the connection between the support portion 332 and the connecting portion 333, the first snap ring 321 and the second snap ring 353 are respectively matched with the snap grooves 334 on the support portion 332 and the connecting portion 333, and the input pin 32 is provided with a ring-shaped There are a plurality of No. 1 bosses 322, an input layer 323 is provided on the upper end of the No. 1 boss 322, the input layer 323 is electrically connected to the resistance wire 12, the No. 1 boss 322 is parallel to the axis of the input pin 32, a No. 2 boss 351 is provided in an annular manner in the slide hole 355, an output layer 352 is provided on the No. 2 boss 351, the output layer 352 is electrically connected to the pin 2, the No. 2 boss 351 is parallel to the axis of the slide hole 355, and the length of the input layer 323 is equal to the length of the output pin 2. The thickness and length of the output layer 352 are equal, the radial cross-section of the No. 1 boss 322 and the No. 2 boss 351 is trapezoidal, the large end of the No. 1 boss 322 is connected to the input pin 32, the input layer 323 is located on the small end of the No. 1 boss 322, the large end of the No. 2 boss 351 is connected to the output shell 35, the output layer 352 is located on the small end of the No. 2 boss 351, the outer wall of the connecting portion 333 is annularly provided with a plurality of No. 2 grooves 3331, the inner wall of the connecting hole 331 is annularly provided with a plurality of No. 1 grooves 3332, the radial cross-section of the No. 1 groove 3332 and the No. 2 groove 3331 is trapezoidal, the inner and outer walls of the connecting portion 333 of the large end of the No. 1 groove 3332 and the No. 2 groove 3331 are connected, the number of the No. 1 groove 3332 is equal to the number of the No. 1 boss 322, and the two cooperate with each other, the number of the No. 2 grooves 3331 is equal to the number of the No. 2 boss 351, and the two cooperate with each other.

[0046] See also Figure 3 , Figure 4 , Figure 5 , Figure 8 , Fig. 9A sealing ring 36 is coaxially installed in the sliding hole 355, the inner diameter of the sealing ring 36 is slidably connected to the support part 332, the outer diameter of the sealing ring 36 is slidably connected to the sliding hole 355, both ends of the sealing ring 36 are respectively connected to the driving block 34 and the card slot 334, the sealing ring 36 is made of flexible material, one end of the sealing ring 36 close to the card slot 334 is provided with a second inclined surface 361, the second snap ring 353 is provided with a first inclined surface 3531, the first inclined surface 3531 and the second inclined surface 361 are parallel, an exhaust hole 3334 is provided in the card slot 334, the exhaust hole 3334 is connected to the inner wall and the outer wall of the connecting part 333, an exhaust groove 362 is provided on the outer wall of the sealing ring 36, the exhaust groove 362 is arranged parallel to the axis of the support part 332, and the exhaust groove 362 runs through the sealing ring 36.

[0047] See also Figure 1 , Figure 7 The surface of the sliding and input pin 32 is sandblasted, the pressure range of the sandblasting is 0.3PMa, the surface roughness of the product after sandblasting is 5μm, and a plurality of guide grooves 354 are provided on one side of the output shell 35 and the pin 2. The guide grooves 354 are vertically arranged, and the width of the guide grooves 354 is 0.5mm.

[0048] Working principle: When installing the resistor, spot tin soldering is performed on the pin 2 and the circuit board. Under the guidance of the guide groove 354 on the output shell 35, the soldering liquid on the pin 2 is evenly spread over the entire side of the output shell 35. The heat of the soldering liquid is transferred to the drive block 34 through the shell of the output shell 35, so that the drive block 34 is evenly heated. The drive block 34 is made of a mixture of epoxy resin, zinc powder and ammonium salt. When heated, the epoxy resin will gradually soften and flow during the heating process. The zinc powder reacts with oxygen in the air under high temperature conditions to generate zinc oxide. The ammonium salt can reduce the starting temperature of the zinc powder oxidation reaction, so that the reaction can be carried out at a lower temperature. As the zinc powder oxidation reaction proceeds, the volume of the generated zinc oxide increases, and the heat released by the reaction prompts the epoxy resin to The fat further softens and expands, and the generation of gas inside the material also causes its volume to increase multiples. During the expansion process of the drive block 34, the connecting ring 33 coaxially installed in the sliding hole 355 is pushed to move. When the connecting portion 333 on the connecting ring 33 contacts the base 31, the two ends of the connecting portion 333 are squeezed. The connecting ring 33 is made of a flexible conductive material of conductive sponge. At this time, the axial length of the connecting ring 33 is shortened, the radial dimension is increased, and it is connected to the output shell 35 and the input pin 32. At this time, the pin 2 is electrically connected to the resistance wire 12 to avoid the high temperature of the solder on the pin 2 being directly transferred to the resistor body 1, thereby causing the winding position and arrangement of the resistance wire 12 to change, resulting in data errors, thereby ensuring the stability of the resistance value and the measurement accuracy.

[0049] At the same time, during the movement of the connecting ring 33, the gas in the enclosed space formed by the connecting hole 331 and the end face of the input pin 32 passes through the exhaust hole 3334, the clamping groove 334 and the exhaust groove 362 to the sliding hole 355 where the driving block 34 is located, and then participates in the oxidation reaction of zinc to prevent the gas from entering the gap between the inner wall of the connecting part 333 and the input pin 32. At this time, under the push of the driving block 34, the second inclined surface 361 on the sealing ring 36 fits with the first inclined surface 3531 on the second clamping ring 353. The second inclined surface 361 fits with the first inclined surface 3531 and the extrusion deformation of the sealing ring 36, so that the exhaust groove 362 on the sealing ring 36 is closed to prevent the backflow of gas.

[0050] During the process of the connection part 333 being squeezed and expanded, the radial dimension increases, and the axial dimension change of the connection part 333 presents that the middle is high and the two ends are low. At this time, the high part first contacts the inner wall of the sliding hole 355 and the outer wall of the input pin 32 respectively. Under the restriction of the inner wall of the sliding hole 355 and the outer wall of the input pin 32 and the push of the driving block 34, the contact part transitions from the first contact in the middle to the two ends. At the same time, the No. 1 groove 3332 and the No. 2 groove 3331 on the connection part 333 respectively contact the No. 1 boss 322 on the input pin 32 and the inner wall of the sliding hole 355. The second boss 351 on the first boss 322 and the second boss 351 is fitted, and the input layer 323 and the output layer 352 on the first boss 322 and the second boss 351 are designed to be equal in thickness to achieve equal electrical contact surface areas on both sides, so that the resistance value remains unchanged. At this time, due to the bending at both ends of the connecting portion 333, there is stress concentration on the inner side of the bending. The design of the groove ring 3333 reduces the accumulation of stress inside the bending, thereby effectively dissipating the stress, avoiding stress concentration on the inner side of the bending that affects the resistance value and heat dissipation problem, and ensuring the accuracy of the resistance value.

[0051] As the driving block 34 squeezes the connecting ring 33, the connecting portion 333 is deformed. At this time, the axial length of the connecting portion 333 is shortened, and the groove 334 slides into the same plane of the No. 1 snap ring 321 and the No. 2 snap ring 353. At the same time, the radial dimension increases. At this time, the No. 1 snap ring 321 and the No. 2 snap ring 353 cooperate with the groove 334 on the support portion 332 and the connecting portion 333 respectively. The No. 1 snap ring 321 and the No. 2 snap ring 353 limit the axial position of the connecting portion 333. By using the No. 1 snap ring 321 and the No. 2 snap ring 353 to limit the axial position of the connecting portion 333, jitter during the use of the resistor is avoided, thereby ensuring the stability of the resistance value.

[0052] When the No. 1 retaining ring 321 and the No. 2 retaining ring 353 cooperate with the slot 334, the sealing ring 36 continues to move forward under the push of the driving block 34. At this time, the No. 1 inclined surface 3531 is in contact with the No. 2 inclined surface 361. The driving block 34 continues to push and under the guidance of the No. 1 inclined surface 3531, the sealing ring 36 is squeezed along the inclined surface to come into the slot 334. The sealing ring 36 is made of rubber and has good flexibility and deformability. As the driving block 34 is continuously squeezed, the sealing ring 36 is deformed in the slot 334 and continuously accumulated to fill the slot 334, thereby preventing epoxy resin and zinc powder from coming to the surface of the connecting part 333 and the No. 2 boss 351 through the gap between the support block and the sliding hole 355. This will hinder the connection between the connecting part 333 and the boss, making the resistor unusable.

[0053] A specific embodiment of the present invention is described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above described embodiment. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments without departing from the principles and ideas of the present invention should still fall within the scope of protection of the present invention.

Claims

1. A high pulse high frequency radio frequency power resistor, characterized in that: The invention comprises a resistor body (1), a pin (2), a base (31), an input pin (32), an output shell (35) and a connecting ring (33), wherein the two ends of the resistor body (1) are connected to the pins (2), the resistor body (1) comprises an insulating frame (11), a resistance wire (12) and a packaging material (13), the outer wall of the insulating frame (11) is surrounded by the resistance wire (12), the resistance wire (12) and the insulating frame (11) are wrapped with the packaging material (13), the insulating frame (11) is connected to the base (31), the base (31) is made of a heat-insulating material, the center of the base (31) is connected to the input pin (32), the edge of the base (31) is An output shell (35) is connected to the output shell (35), the pin (2) is installed on the output shell (35), the output shell (35) is electrically connected to the pin (2), the input pin (32) is electrically connected to the resistance wire (12), a sliding hole (355) is opened inside the output shell (35), a connecting ring (33) is arranged inside the sliding hole (355), the connecting ring (33) is located inside the gap between the input pin (32) and the output shell (35), the connecting ring (33) is made of a flexible conductive material, an extrusion component is arranged inside the sliding hole (355), and the extrusion component connects the connecting ring (33) to the input pin (32) and the output shell (35) respectively through thermal expansion.

2. A high pulse high frequency radio frequency power resistor according to claim 1, characterized in that: The extrusion assembly comprises a driving block (34), the driving block (34) is located inside the sliding hole (355), and the driving block (34) is fitted inside the input shell, the connecting ring (33) comprises a supporting portion (332) and a connecting portion (333), the supporting portion (332) is slidably connected to the driving block (34), and the connecting portion (333) is coaxially provided with a connecting hole (331), and the driving block (34) is made of a mixture of epoxy resin, zinc powder and ammonium salt.

3. A high pulse high frequency radio frequency power resistor according to claim 2, characterized in that: A first snap ring (321) is coaxially disposed on the outer wall of the input pin (32), a second snap ring (353) is coaxially disposed in the sliding hole (355), the first snap ring (321) and the second snap ring (353) are located on the same radial plane, a snap groove (334) is coaxially disposed at the connection between the support portion (332) and the connecting portion (333), and the first snap ring (321) and the second snap ring (353) are matched with the snap grooves (334) on the support portion (332) and the connecting portion (333), respectively.

4. A high pulse high frequency radio frequency power resistor according to claim 3, characterized in that: A plurality of No. 1 bosses (322) are provided in an annular shape on the input pin (32); an input layer (323) is provided at the upper end of the No. 1 boss (322); the input layer (323) is electrically connected to the resistance wire (12); the No. 1 boss (322) is parallel to the axis of the input pin (32); a No. 2 boss (351) is provided in an annular shape inside the sliding hole (355); an output layer (352) is provided on the No. 2 boss (351); the output layer (352) is electrically connected to the pin (2); the No. 2 boss (351) is parallel to the axis of the sliding hole (355); the length of the input layer (323) is equal to the thickness and length of the output layer (352).

5. A high pulse high frequency radio frequency power resistor according to claim 4, characterized in that: The cross-sections of the No. 1 boss (322) and the No. 2 boss (351) in the radial direction are trapezoidal. The large end of the No. 1 boss (322) is connected to the input pin (32). The input layer (323) is located on the small end of the No. 1 boss (322). The large end of the No. 2 boss (351) is connected to the output shell (35). The output layer (352) is located on the small end of the No. 2 boss (351). The outer wall of the connecting portion (333) is annularly provided with a plurality of No. 2 grooves (3331). The connecting hole (331 ) The inner wall is provided with a plurality of No. 1 grooves (3332) in an annular shape, and the cross-sections of the No. 1 grooves (3332) and the No. 2 grooves (3331) in the radial direction are trapezoidal, and the inner and outer walls of the large end connecting parts (333) of the No. 1 grooves (3332) and the No. 2 grooves (3331) are connected, and the number of the No. 1 grooves (3332) is equal to the number of the No. 1 bosses (322), and the two cooperate with each other, and the number of the No. 2 grooves (3331) is equal to the number of the No. 2 bosses (351), and the two cooperate with each other.

6. The high pulse high frequency RF power resistor according to claim 3, characterized in that: A sealing ring (36) is coaxially installed in the sliding hole (355); the inner diameter of the sealing ring (36) is slidably connected to the support portion (332); the outer diameter of the sealing ring (36) is slidably connected to the sliding hole (355); two ends of the sealing ring (36) are respectively connected to the driving block (34) and the clamping groove (334); the sealing ring (36) is made of a flexible material; one end of the sealing ring (36) close to the clamping groove (334) is provided with a second inclined surface (361); the second clamping ring (353) is provided with a first inclined surface (3531), the first inclined surface (3531) is parallel to the second inclined surface (361), the slot (334) is provided with an exhaust hole (3334), the exhaust hole (3334) is connected to the inner wall and the outer wall of the connecting part (333), the outer wall of the sealing ring (36) is provided with an exhaust groove (362), the exhaust groove (362) is arranged parallel to the axis of the supporting part (332), and the exhaust groove (362) passes through the sealing ring (36).

7. The high pulse high frequency RF power resistor according to claim 5, characterized in that: The connecting portion (333) is coaxially symmetrically provided with a plurality of groove rings (3333), the groove rings (3333) being respectively located at the inner walls at both ends of the connecting hole (331) and at both ends of the outer wall of the connecting hole, and the cross section of the groove ring (3333) is triangular.

8. The high pulse high frequency RF power resistor according to claim 7, characterized in that: The surfaces of the sliding and input pins (32) are sandblasted, the pressure range of the sandblasting is 0.2-0.7PMa, and the surface roughness of the product after the sandblasting is 1-10μm. A plurality of guide grooves (354) are provided on one side of the output shell (35) and the pin (2), and the guide grooves (354) are vertically arranged, and the width of the guide grooves (354) is 0.1-1mm.

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