Integrated sensor and coil and forming die thereof

Abstract

The invention belongs to the technical field of equipment special for assembling inductors, and particularly provides an integrated sensor and a coil and a forming die thereof. The forming die comprises a static die, a movable die and a guide rod, and further comprises a positioning locking block detachably fixed to the static die, the positioning locking block is provided with a detachable connecting structure used for being detachably connected with an insulating hanging block on a coil, and the movable die is provided with a containing cavity matched with the positioning locking block to contain the positioning locking block. The fixing position of the positioning locking block and the static die meets the requirement that the coil can be coaxial with the insulating tube, and the middle section of the coil can coincide with the middle section of the insulating tube or has a set distance with the middle section of the insulating tube. And the coil is provided with an insulating hanging block which is detachably connected and matched with the forming die. The integrated sensor comprises the coil. The forming die is additionally provided with the positioning locking block which can be connected with the insulating hanging block on the coil to play a role in positioning the coil, so that the coil can be kept at set positions in the axial direction and the radial direction under the positioning action of the positioning locking block, and the product percent of pass is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of equipment specially used for assembling inductors, and in particular relates to an integrated sensor and its coil and a forming die. Background Art

[0002] The pole-mounted circuit breaker is an important switchgear in the outdoor power system, which is mainly used to control and protect the circuits in the distribution network. The pole-mounted circuit breaker will be equipped with a voltage transformer and a current transformer. In order to facilitate the installation of the equipment, the invention patent application with the application publication number CN114720746A discloses an integrated sensor that integrates voltage measurement and current measurement. The integrated sensor integrates a coil and a capacitor inside, wherein the coil is sleeved outside the insulating tube (i.e., the epoxy resin tube), and there is a gap between the insulating tube and the coil. A shielding net is also provided between the insulating tube and the coil. An external contact (i.e., an electrical contact) is connected to one end of the insulating tube. When in use, a conductive rod can be inserted into the inside of the insulating tube, and the external contact is electrically connected to the conductive rod. The coil is connected to the outside with a bracket, and the lead wire of the coil is arranged along the bracket and electrically connected to the preset wiring terminal.

[0003] The utility model patent with the authorization announcement number CN218111443U discloses a mold that can be used to mold the above-mentioned integrated sensor. The mold includes a static mold and a dynamic mold. The static mold and the dynamic mold can be buckled to form multiple cavities, and each cavity is connected to a runner for epoxy resin to flow in. Before pouring, the coil, insulating tube, shielding net, external contact, etc. need to be assembled to form a coil shielding assembly. In order to prevent the epoxy resin from clogging the inner hole of the insulating tube, a guide rod (i.e., a through-hole core) is provided on the static mold, and the insulating tube of the coil shielding assembly is sleeved on the guide rod. The capacitor of the sensor is assembled later, and a capacitor slot core is also provided on the static mold. After the pouring is completed, the capacitor slot core position can form a capacitor slot for installing the capacitor. The bracket is placed on the capacitor slot core, which can play a role in supporting the coil shielding assembly. After the coil shielding assembly, the bracket and other inserts are placed in place, the dynamic mold and the static mold are buckled, and the epoxy resin is injected. After the epoxy resin is cured, the sensor body can be initially formed.

[0004] The coil position accuracy is related to the performance and accuracy of the sensor. The position mentioned here includes the position in two directions. One is whether the coil is located coaxially with the insulating tube in the radial direction, and the other is whether the coil is in the designed position in the axial direction. Some sensors require that the coil is located in the center of the insulating tube in the axial direction, that is, the middle section of the coil coincides with the middle section of the insulating tube; some sensors, such as the sensor in the invention patent application with application publication number CN114720746A, require that the middle section of the coil is at a set distance relative to the middle section of the insulating tube. When the above-mentioned mold is in use, only the bracket can support the coil shielding assembly, and the position of the coil cannot be accurately determined in the axial direction, which makes it easy to produce sensors with insufficient coil position accuracy, affecting the product qualification rate. Summary of the invention

[0005] The object of the present invention is to provide a molding die for an integrated sensor to solve the technical problem that the molding die is difficult to ensure the position accuracy of the coil in the prior art, resulting in a low product qualification rate. The object of the present invention is also to provide a coil for an integrated sensor to solve the technical problem that the existing coil is difficult to cooperate with the molding die to ensure the position accuracy of the coil, resulting in a low product qualification rate. The object of the present invention is also to provide an integrated sensor using the above coil to solve the same technical problem.

[0006] To achieve the above purpose, the technical solution of the molding die of the integrated sensor provided by the present invention is: A molding die for an integrated sensor, the molding die comprising a static die, a dynamic die and a guide rod, the guide rod being used to insert an insulating tube of the integrated sensor, the molding die also comprising a positioning locking block detachably fixed to the static die, the positioning locking block being provided with a detachable connection structure for detachably connecting to an insulating hanging block on a coil of the integrated sensor, the dynamic die being provided with an accommodating cavity which matches the positioning locking block for accommodating the positioning locking block, the fixed position of the positioning locking block and the static die being satisfied so that the coil connected to the positioning locking block can be coaxial with the insulating tube, and the middle cross section of the coil can coincide with the middle cross section of the insulating tube or have a set distance therebetween.

[0007] As a further improvement, a boss is provided at one end of the positioning lock block for connecting with the insulating hanger block, and an end face of the boss is used to abut against an end face of the insulating hanger block.

[0008] As a further improvement, the shape and outer circumferential size of the boss are consistent with the shape and outer circumferential size of the insulating hanger block.

[0009] As a further improvement, the positioning locking block has a guiding surface for guiding the positioning locking block into the movable mold accommodating cavity.

[0010] As a further improvement, the detachable connection structure includes a connecting screw, and the positioning locking block is provided with a through hole for the connecting screw to pass through, and the connecting screw is used to connect and cooperate with the threaded hole on the insulating hanging block.

[0011] As a further improvement, the positioning locking block and the static mold are detachably fixed by a detachable fastener, which is a pin arranged on one of the positioning locking block and the static mold, and the other one of the positioning locking block and the static mold is provided with a pin hole for plugging and positioning with the pin.

[0012] The present invention belongs to an improved invention creation, and its beneficial effect is: the molding mold adds a positioning lock block that can be connected with the insulating hanger block on the coil to play a role in positioning the coil. Specifically, the positioning lock block can be connected with the insulating hanger block through a detachable connection structure and fixed to the static mold. After the movable mold is buckled, the positioning lock block can enter the accommodating cavity of the movable mold. After the casting is completed, the positioning lock block, the insulating hanger block and the static mold can be separated and demolded. In the present invention, the fixed position of the positioning lock block relative to the static mold can meet the coaxiality of the coil and the insulating tube of the integrated sensor. For sensors that require the axial position of the coil to be centered, it can ensure that the middle section of the coil coincides with the middle section of the insulating tube; for sensors that require the coil to be located at a set position, it can ensure that there is a set distance between the middle section of the coil and the middle section of the insulating tube. In other words, under the positioning action of the positioning lock block, the coil can be maintained at the set position both in the axial direction and in the radial direction, which improves the position accuracy of the coil and thereby improves the product qualification rate.

[0013] To achieve the above-mentioned purpose, the technical solution of the coil of the integrated sensor provided by the present invention is: The coil of the integrated sensor comprises a coil body. An insulating hanging block is arranged on the outer periphery of the coil body. The insulating hanging block is provided with a detachable connection structure for detachably connecting with a positioning locking block on a forming mold.

[0014] As a further improvement, the insulating hanger block is located at a central position in the axial direction of the coil.

[0015] As a further improvement, the insulating hanging block is fixed to the outer circumference of the coil by wrapping with paper strips.

[0016] As a further improvement, the detachable connection structure is a threaded hole for connecting with a connecting screw.

[0017] The present invention belongs to an improved invention creation, and its beneficial effects are: an insulating hanging block is added to the outer periphery of the coil body. When producing an integrated sensor, it can be connected to the positioning lock block of the molding mold through the insulating pad block, and relatively fixed with the static mold through the positioning lock block. The fixed position of the positioning lock block relative to the static mold can meet the coaxiality of the coil and the insulating tube of the integrated sensor. For sensors that require the axial position of the coil to be centered, it can ensure that the middle section of the coil coincides with the middle section of the insulating tube; for sensors that require the coil to be located at a set position, it can ensure that the middle section of the coil is at a set distance from the middle section of the insulating tube. In other words, under the positioning action of the positioning lock block, the coil can be maintained at the set position both axially and radially, which improves the position accuracy of the coil and thereby improves the product qualification rate.

[0018] To achieve the above-mentioned purpose, the technical solution of the integrated sensor provided by the present invention is: The integrated sensor comprises a coil and an insulating tube located inside the coil. The coil comprises a coil body. An insulating hanging block is arranged on the periphery of the coil body. The insulating hanging block is provided with a detachable connection structure for detachably connecting with a positioning locking block on a forming mold.

[0019] As a further improvement, the insulating hanger block is located at a central position in the axial direction of the coil.

[0020] As a further improvement, the insulating hanging block is fixed to the outer circumference of the coil by wrapping with paper strips.

[0021] As a further improvement, the detachable connection structure is a threaded hole for connecting with a connecting screw.

[0022] The present invention belongs to an improved invention creation, and its beneficial effects are: an insulating hanging block is added to the outer periphery of the coil body. When producing an integrated sensor, it can be connected to the positioning lock block of the molding mold through the insulating pad block, and relatively fixed with the static mold through the positioning lock block. The fixed position of the positioning lock block relative to the static mold can meet the coaxiality of the coil and the insulating tube of the integrated sensor. For sensors that require the axial position of the coil to be centered, it can ensure that the middle section of the coil coincides with the middle section of the insulating tube; for sensors that require the coil to be located at a set position, it can ensure that the middle section of the coil is at a set distance from the middle section of the insulating tube. In other words, under the positioning action of the positioning lock block, the coil can be maintained at the set position both axially and radially, which improves the position accuracy of the coil and thereby improves the product qualification rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of an embodiment of a molding die for an integrated sensor in the present invention (the movable die is not shown); Figure 2 A schematic diagram of a molding die embodiment of an integrated sensor in the present invention in use (movable die is not shown); Figure 3 This is a schematic diagram of the matching relationship between the positioning lock block, the coil, and the guide rod of the molding die embodiment of the integrated sensor in the present invention when in use; Figure 4 for Figure 1 Axonometric drawing of the center positioning lock block; Figure 5 for Figure 1 A schematic diagram of the structure of the middle guide rod; Figure 6 for Figure 1 The schematic diagram of the structure of the middle demoulding rod; Figure 7 for Figure 2 Schematic diagram of the structure of the middle coil.

[0024] Description of reference numerals: 1. static mold; 2. guide rod; 3. capacitor slot core; 4. positioning lock block; 5. demoulding rod; 101. cavity; 102. runner; 201. frustum; 401. boss; 402. perforation; 403. guide surface; 404. pin; 501. demoulding wedge surface; 100. insulating tube; 200. shielding net; 300. coil body; 400. external contact; 500. insulating hanger block; 600. threaded hole. DETAILED DESCRIPTION

[0025] In order to improve the product qualification rate of the integrated sensor, the basic technical concept of the present invention is to add a positioning lock block to fix the position of the coil in the molding die. Accordingly, it is also necessary to configure a hanging block that can be connected to the positioning lock block in the coil, and the hanging block should be made of insulating material. The positioning lock block is connected to the hanging block on the coil and fixed to the static mold, and the fixed position of the positioning lock block just satisfies the radial center position of the coil relative to the insulating tube and the set position in the axial direction. After the casting is completed, the positioning lock block can be removed.

[0026] The present invention is further described in detail below in conjunction with embodiments and drawings.

[0027] Specific embodiments of the molding die of the integrated sensor provided by the present invention: The molding die of the integrated sensor provided in this embodiment includes a static die 1, a dynamic die (not shown in the figure), an injection die (not shown in the figure), etc. The static die 1 and the dynamic die can be buckled to form a cavity 101. The cavity 101 is also connected to a runner 102. The epoxy resin can flow into the cavity 101 through the runner 102. Figure 1 As shown, the integrated sensor further includes a guide rod 2, which can be inserted into the static mold 1 when in use. Figure 3As shown, before casting, the insulating tube 100, the shielding net 200, the coil, the outer contact 400, etc. need to be assembled together, and the guide rod 2 is inserted into the inner hole of the insulating tube 100, which is used to prevent the epoxy resin from clogging the inner hole of the insulating tube 100 during casting. Specifically, the guide rod 2 can be selected from the existing technology, such as Figure 5 As shown, the guide rod 2 includes a rod body and a cone 201 disposed at one end of the rod body, and the end of the cone 201 can cooperate with the outer contact 400 to stop and play an axial limit role to limit the position of the insulating tube 100. The molding mold also includes a capacitor slot core 3, and the relevant inserts of the sensor, such as a bracket, a contact, etc., can be placed on the capacitor slot core 3. After the casting is completed, the capacitor slot core 3 forms a capacitor slot for installing a capacitor.

[0028] Different from the prior art, this embodiment further includes a positioning lock block 4, such as Figure 1-Figure 4 As shown, the positioning lock block 4 is fixed relative to the static mold 1 when in use. After the casting is completed, the positioning lock block 4 can be removed from the static mold 1, that is, the positioning lock block 4 is detachably fixedly matched with the static mold 1. The movable mold (not shown in the figure) is provided with a receiving cavity, the shape of which matches the shape of the positioning lock block 4, and the position of which corresponds to the position of the positioning lock block 4. After the movable mold and the static mold 1 are buckled, the positioning lock block 4 can enter the receiving cavity to ensure that the movable mold and the static mold 1 can be buckled smoothly, and the positioning lock block 4 will not be cast into one piece with the mold, that is, the positioning lock block 4 should be configured with a detachable connection structure that can be detachably connected to the coil.

[0029] The function of the positioning lock block 4 is to connect with the coil and fix the position of the coil, and the positioning lock block can be separated from the coil after the pouring is completed. Figure 7 As shown, the coil is equipped with an insulating hanging block 500 for detachably connecting with the positioning locking block 4. Specifically, the coil includes a coil body 300, and the insulating hanging block 500 is arranged on the outer periphery of the coil body 300, and the insulating hanging block 500 is provided with a detachable connection structure for connecting with the positioning locking block 4. The coil body 300 is a prior art, and the specific structure is not repeated. The insulating hanging block 500 is made of insulating material, and can be made of nylon.

[0030] like Figure 2 and Figure 3 As shown, for the sensor that requires the coil to be located in the axial center of the insulating tube 100, before the casting operation, the coil, the shielding net 200, the insulating tube 100, the external contact 400 and other components are assembled into a whole, and then the positioning lock block 4 is connected to the insulating hanging block 500, and then the positioning lock block 4 is fixed to the static mold 1, and finally the dynamic mold is closed and the material is injected, wherein the fixed position of the positioning lock block 4 and the static mold 1 satisfies that the coil connected thereto is coaxial with the insulating tube 100, and the middle section of the coil coincides with the middle section of the insulating tube 100.

[0031] In other embodiments, for sensors that require the coil to be located at a certain position that is not centered in the axial direction of the insulating tube 100, similarly, before the pouring operation, the coil, shielding net 200, insulating tube 100, external contact 400 and other components are first assembled into a whole, and then the positioning locking block 4 is connected to the insulating hanging block 500, and then the positioning locking block 4 is fixed to the static mold 1, and finally the dynamic mold is closed and injected with material, wherein the fixed position of the positioning locking block 4 and the static mold 1 satisfies that the coil connected thereto is coaxial with the insulating tube 100, and there is a set distance between the middle section of the coil and the middle section of the insulating tube 100.

[0032] After analysis, it can be seen that when the molding mold in this embodiment is in use, the positioning locking block 4 is connected to the coil to keep the coil in a centered position in the radial direction and in a set position in the axial direction, thereby improving the problem of low product qualification rate caused by insufficient coil position accuracy in the prior art.

[0033] As an implementation method of a detachable connection structure for realizing detachable connection between the positioning lock block 4 and the coil, Figure 4 As shown, the positioning lock block 4 can be provided with a through hole 402 for the connecting screw (not shown in the figure) to pass through. Figure 7 As shown, the insulating hanging block 500 is provided with a threaded hole 600 for connecting with a connecting screw. Preferably, two perforations 402 and two threaded holes 600 are provided, so that two connecting screws can be used to connect the positioning locking block 4 and the insulating hanging block 500 at the same time, which is more stable. This form of detachable connection structure has a simpler structure and is convenient to use. Of course, in other embodiments, buckles, elastic pins and other structures can be provided on the positioning locking block 4, and corresponding buckles, pin holes and other structures can be provided on the insulating hanging block 500.

[0034] As an embodiment in which the positioning locking block 4 and the static mold 1 are detachably fixed, the positioning locking block 4 can be connected to the static mold 1 via a detachable fastener. Figure 4 As shown, the positioning lock block 4 is provided with a pin 404, and correspondingly, the static mold 1 is provided with a pin hole for plugging and positioning with the pin 404. When in use, the pin 404 can be directly inserted into the pin hole on the static mold 1. Preferably, two pins 404 are provided, and the two pins 404 are connected and matched with the two pin holes on the static mold 1 for more stable. Of course, in other embodiments, the positions of the pin 404 and the pin hole can also be interchanged, that is, the pin 404 is provided on the static mold 1, and the pin hole is provided on the positioning lock block 4.

[0035] In addition to using detachable fasteners, strong magnets can also be used to fix the positioning lock block 4 to the static mold 1. For accurate positioning, a ruler can be set on the static mold 1 to indicate the fixed position of the positioning lock block 4 in the upper and lower directions.

[0036] After the integrated sensor is cast once, silicone rubber needs to be cast. Figure 3 and Figure 4 As shown, one end of the positioning lock block 4 used for connecting with the insulating hanging block 500 is also provided with a boss 401. After the positioning lock block 4 and the insulating hanging block 500 are connected, the convex end face of the boss 401 abuts against the end face of the insulating hanging block 500. This makes it easy to separate the positioning lock block 4 from the insulating hanging block 500 after the epoxy resin is poured. On the other hand, a groove can be formed at the corresponding position of the boss 401 after the epoxy resin is poured, which is convenient for the silicone rubber to flow in when pouring. Of course, in other embodiments, the boss 401 may not be provided. In order to facilitate the subsequent pouring of silicone rubber, the mold used for pouring silicone rubber can be improved.

[0037] Furthermore, if Figure 4 and Figure 7 As shown, the shape and outer circumferential size of the boss 401 are consistent with the shape and outer circumferential size of the insulating hanging block 500. When the positioning locking block 4 and the insulating hanging block 500 are connected, when the boss 401 and the insulating hanging block 500 are basically matched, it means that the through hole 402 and the threaded hole 600 are aligned, which is convenient for inserting the connecting screw.

[0038] In order to facilitate the positioning lock block 4 to smoothly enter the accommodating cavity of the movable mold, as a preferred embodiment, Figure 4 As shown, the positioning lock block 4 has a guide surface 403, and the guide surface 403 is used to guide the positioning lock block 4 into the movable mold accommodating cavity. Specifically, the guide surface 403 can be a wedge-shaped surface, which has a better guiding effect. Of course, in other embodiments, the guide surface 403 may not be configured, that is, the positioning lock block 4 is a rectangular block, and correspondingly, the accommodating cavity is a rectangular cavity. Due to the high processing accuracy of the mold, when the other positioning points of the movable mold and the static mold 1 can be accurately positioned, the positioning lock block 4 can also smoothly enter the accommodating cavity.

[0039] In addition, in order to facilitate demoulding, a demoulding rod 5 is also configured in this embodiment. Figure 1 , Figure 2 and Figure 6 As shown, one end of the demoulding rod 5 is a force-bearing end for bearing the impact force of the impact tool, and the other end is provided with a demoulding wedge surface 501 that cooperates with the end of the guide rod 2 to eject the guide rod 2. After the pouring is completed, the staff can use a handheld tool to knock the demoulding rod 5, and the demoulding rod 5 moves downward. After the demoulding wedge surface 501 hits the end of the guide rod 2, the guide rod 2 can be ejected, and the semi-finished product after pouring can be separated from the static mold 1.

[0040] For an integrated sensor that requires the coil to be located in the axial center of the insulating tube 100, the insulating hanger 500 is preferably connected to the axial center of the coil body 300, so that the forces at both ends of the coil body 300 are balanced. Of course, in other embodiments, for smaller coils, the position of the insulating hanger 500 can also be slightly biased to one end, and the size of the positioning lock block 4 can be designed accordingly to ensure that the coil is centered relative to the insulating tube 100.

[0041] When the insulating hanging block 500 is connected to the coil body 300, the insulating hanging block 500 can be wrapped around the outer periphery of the coil body 300 with a paper strip, or the insulating hanging block 500 can be bonded to the outer periphery of the coil body 300 with adhesive. The paper strip used can be semi-conductive crepe paper. Semi-conductive crepe paper is a special insulating material commonly used in coil manufacturing. It also has a certain strength. It is not easy to stretch and deform after being stressed, and the position of the coil can be guaranteed. Of course, in other embodiments, other paper strips with a certain strength can also be used to wrap the insulating hanging block 500.

[0042] Specific embodiments of the coil of the integrated sensor in the present invention: The embodiment of the coil of the integrated sensor is consistent with the coil structure described in the embodiment of the molding die of the integrated sensor, and will not be described in detail here.

[0043] Specific embodiments of the integrated sensor in the present invention: The integrated sensor includes an insulating tube and the coil described in the embodiment of the molding die of the integrated sensor, which will not be described in detail here.

[0044] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A molding die for an integrated sensor, the molding die comprising a static die, a dynamic die and a guide rod, the guide rod being used to insert an insulating tube of the integrated sensor, wherein: The molding die also includes a positioning locking block that is detachably fixed to the static die, the positioning locking block is provided with a detachable connection structure for detachably connecting to an insulating hanging block on a coil of the integrated sensor, the dynamic die is provided with an accommodating cavity that matches the positioning locking block for accommodating the positioning locking block, and the fixed position of the positioning locking block and the static die satisfies that the coil connected to the positioning locking block can be coaxial with the insulating tube, and the middle cross section of the coil can coincide with the middle cross section of the insulating tube or have a set distance.

2. The molding die of the integrated sensor according to claim 1, characterized in that: One end of the positioning lock block used for connecting with the insulating hanging block is provided with a boss, and the end surface of the boss is used for abutting against the end surface of the insulating hanging block.

3. The molding die of the integrated sensor according to claim 2, characterized in that: The shape and outer circumference size of the boss are consistent with the shape and outer circumference size of the insulating hanging block.

4. The molding die of the integrated sensor according to any one of claims 1 to 3, characterized in that: The positioning locking block has a guiding surface for guiding the positioning locking block to enter the movable mold accommodating cavity.

5. The molding die of the integrated sensor according to any one of claims 1 to 3, characterized in that: The detachable connection structure comprises a connection screw, and a through hole for the connection screw to pass through is provided on the positioning lock block, and the connection screw is used to connect and cooperate with the threaded hole on the insulating hanging block.

6. The molding die of the integrated sensor according to any one of claims 1 to 3, characterized in that: The positioning lock block and the static mold are detachably fixed by a detachable fastener, which is a pin arranged on one of the positioning lock block and the static mold, and the other of the positioning lock block and the static mold is provided with a pin hole for plugging and positioning with the pin.

7. A coil of an integrated sensor, comprising a coil body, characterized in that: An insulating hanging block is arranged on the outer periphery of the coil body, and a detachable connecting structure for detachably connecting with a positioning locking block on a forming mold is arranged on the insulating hanging block.

8. The integrated sensor coil according to claim 7, characterized in that: The insulating hanging block is located at the center of the coil in the axial direction.

9. The integrated sensor coil according to claim 7 or 8, characterized in that: The insulating hanging block is fixed to the outer circumference of the coil by wrapping it with paper strips.

10. The integrated sensor coil according to claim 7 or 8, characterized in that: The detachable connection structure is a threaded hole used for connection with a connecting screw.

11. An integrated sensor, comprising a coil and an insulating tube located inside the coil, characterized in that: The coil is the coil of the integrated sensor according to any one of claims 7 to 10.

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