Metallized film capacitor for AC motor

Abstract

The utility model discloses a metallized film capacitor for an AC motor, which relates to the technical field of metallized film capacitors, and comprises a capacitor aluminum shell, a capacitor end cover, a threading part and a wire harness, the threading part is used for fixedly connecting the wire harness through crimping, and the metallized film capacitor also comprises a protection mechanism used for reducing the oxidation degree of the threading part. The protection mechanism comprises a sealing cover with the top provided with a circular sleeving hole, the threading part is located in the inner side of the sealing cover, the sealing cover slidably sleeves a wire body of the wire harness through the circular sleeving hole, an attaching sealing part is arranged between the wire harness and the inner wall of the circular sleeving hole, and the sealing cover is detachably connected with the top end face of the capacitor end cover. According to the utility model, through the arrangement of the sealing cover, after the threading part and the wire harness are fixedly connected through crimping, only the sealing cover needs to slide down to cover the threading part, so that the threading part can be effectively sealed and protected, the oxidation influence of the external environment on the threading part is reduced, and the service life of the threading part is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of metallized film capacitor, concretely relates to a metallized film capacitor for alternating current motor. BACKGROUND

[0002] In modern electronic equipment and power system, metallized film capacitor is widely used in many fields by virtue of its excellent performance, such as high energy density, low loss, good self-healing characteristics, wherein, the energy storage capacitor in power system and the backup power capacitor of communication base station are typical application scenarios of metallized film capacitor.

[0003] In actual operation, the connection between the wire harness and the end cover of the metallized film capacitor is the key link to ensure the normal work of the capacitor, at present, the common connection mode is crimping, this connection mode can provide certain connection strength in the initial stage, and meet the basic electrical connection demand of the capacitor.

[0004] However, with the passage of time, the problem gradually appears, when the capacitor is in working state for a long time, the crimping part will inevitably be affected by various factors, among which the oxidation phenomenon is particularly prominent, the metal material of the crimping part will chemically react with oxygen in the air, and gradually form an oxide layer, the existence of the oxide layer will increase the contact resistance, hinder the smooth transmission of current, and then cause the heating of the connection part, and the long-term heating will further accelerate the oxidation process, forming a vicious cycle. UTILITY MODEL CONTENT

[0005] To solve the above technical problems, a metallized film capacitor for alternating current motor is provided, which solves the problems raised in the background art.

[0006] To achieve the above purpose, the utility model adopts the technical scheme of: a metallized film capacitor for alternating current motor, comprising a capacitor aluminum shell, a capacitor end cover arranged at the top of the capacitor aluminum shell, a wire penetrating part fixedly connected to the capacitor end cover, and a wire harness penetrating the wire penetrating part, the wire penetrating part is fixedly connected with the wire harness through crimping, and further comprising a protection mechanism for reducing the oxidation degree of the wire penetrating part.

[0007] The protection mechanism comprises a closure cover provided with a circular sleeving hole, the wire penetrating part is located in the inner side of the closure cover, and the closure cover is sleeved on the wire body of the wire harness through the circular sleeving hole, a close-fitting sealing part is arranged between the wire harness and the inner wall of the circular sleeving hole, and the closure cover and the top end face of the capacitor end cover are detachably connected.

[0008] Preferably, the close-together sealing part is mainly composed of an air bag and a pressure regulating assembly, the air bag is sleeved on the wire harness body and is fixedly connected with the inner wall of the circular sleeving hole, and a contraction groove in communication with the inside of the air bag is arranged in the inner wall of the top of the sealing cover.

[0009] Preferably, the pressure regulating assembly comprises a piston sliding in the contraction groove, the inner wall of the piston away from the air bag is vertically fixed with an internally threaded cylinder, an externally threaded rod is threadedly connected in the internally threaded cylinder, and one end of the externally threaded rod is rotatably penetrated through the sealing cover and is fixed with a control block.

[0010] Preferably, the outer wall of the internally threaded cylinder is sleeved with a limiting ring, a sliding groove is arranged in the inner wall of the limiting ring, a limiting strip fixedly connected with the outer wall of the internally threaded cylinder is slidingly arranged in the sliding groove, and the limiting ring is fixedly connected with the inner wall of the contraction groove through a support.

[0011] Preferably, the bottom end of the sealing cover is provided with an annular mounting groove, and a positioning screw sleeve fixedly connected with the top end of the capacitor end cover is threadedly connected in the annular mounting groove.

[0012] Compared with the prior art, the utility model has the advantages that:

[0013] (1) By the setting of the sealing cover, after the threading part and the wire harness are fixedly connected through crimping, the threading part is only covered by sliding down the sealing cover, so that the threading part can be effectively sealed and protected, the influence of the external environment on the threading part is reduced, and the service life of the threading part is prolonged.

[0014] (2) By the setting of the close-together sealing part, when the sealing cover needs to be slid down to seal the threading part, the air cavity of the air bag is first pumped by the pressure regulating assembly, so that the inner wall of the air bag is separated from the wire harness body, so that the air bag does not excessively contact the outer wall of the wire harness during the sliding down of the sealing cover, causing movement obstruction, and after the sealing cover covers the threading part, the air cavity of the air bag is injected by the pressure regulating assembly, so that the inner wall of the air bag tightly abuts against the wire harness body, thereby sealing the circular sleeving hole and improving the sealing performance of the inner cavity of the sealing cover.

[0015] (3) By the setting of the positioning screw sleeve, when the sealing cover contacts the threading part, the positioning screw sleeve is then rotated into the annular mounting groove under the thread structure by manually rotating the sealing cover, so that the fastening characteristics of the thread structure and the positioning function of the annular mounting groove are utilized to realize the close and stable connection between the sealing cover and the threading part, and the sealing performance and reliability of the sealing cover during actual operation are guaranteed, and the possibility of oxidation of the threading part due to loose connection is greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1It is the whole structure schematic view of the utility model;

[0017] Figure 2 It is the local structure schematic view of the utility model;

[0018] Figure 3 It is the capacitor end cover internal structure schematic view of the utility model;

[0019] Figure 4 It is the utility model Figure 3 Structure schematic view of A place in the middle;

[0020] Figure 5 It is the utility model Figure 4 Structure schematic view of B place in the middle.

[0021] Marked in the figure is:

[0022] 1, capacitor aluminum shell;2, capacitor end cover;3, threading part;4, wire harness;5, closure cover;6, positioning screw sleeve;7, air bag;8, shrinkage groove;9, piston;10, internal thread cylinder;11, external thread rod;12, control block;13, limit ring;14, limit bar. Specific implementation

[0023] The following description is used to disclose the utility model so that those skilled in the art can realize the utility model. The preferred embodiments in the following description are only as examples, and other obvious variants can be thought of by those skilled in the art.

[0024] Referring to Figures 1-5 As shown in the figure, a kind of metallized film capacitor for alternating current motor, including capacitor aluminum shell 1, capacitor end cover 2 being arranged at the top of capacitor aluminum shell 1, threading part 3 being fixedly connected in communication on capacitor end cover 2 and wire harness 4 being threaded in threading part 3, threading part 3 is fixedly connected by crimping wire harness 4, further include the protection mechanism for reducing the oxidation degree of threading part 3;

[0025] Protection mechanism includes closure cover 5 with circular sleeve hole in top, threading part 3 is in the inside of closure cover 5, and closure cover 5 is slidably sleeved in the wire body of wire harness 4 through circular sleeve hole;

[0026] By the setting of closure cover 5, after threading part 3 and wire harness 4 are fixedly connected by crimping, only need to slide closure cover 5 to cover threading part 3, so it can effectively seal and protect threading part 3, reduce the oxidation influence of external environment to threading part 3, improve the service life of threading part 3.

[0027] Further, referring to Figures 3-5 As shown in the figure, it is worth mentioning that there is close sealing part between wire harness 4 and the inner wall of circular sleeve hole;

[0028] The close-together sealing part is mainly composed of the air bag 7 and the pressure regulating assembly. The air bag 7 is sleeved on the wire harness 4 and is fixed to the inner wall of the circular sleeving hole. The inner wall of the top of the sealing cover 5 is also provided with a contraction groove 8 which is connected with the inside of the air bag 7. The pressure regulating assembly is located in the contraction groove 8.

[0029] Through the setting of the close-together sealing part, when the sealing cover 5 needs to be lowered and is sealed on the threading part 3, the air cavity of the air bag 7 is pre-sucked by the pressure regulating assembly, so that the air bag 7 is contracted due to the decrease of the air pressure, the inner diameter of the air bag 7 is expanded, the inner wall of the air bag 7 is separated from the wire harness 4, so that the air bag 7 does not excessively contact the outer wall of the wire harness 4 during the lowering process of the sealing cover 5, and the movement is not hindered.

[0030] On the contrary, after the sealing cover 5 is completely covered on the threading part 3, the air cavity of the air bag 7 is injected by the pressure regulating assembly, so that the air bag 7 is inflated and the inner diameter of the air bag 7 is reduced, the inner wall of the air bag 7 is tightly attached to the wire harness 4, so that the circular sleeving hole is sealed and the sealing performance of the inner cavity of the sealing cover 5 is improved.

[0031] Further, as shown in Figure 4 and Figure 5 , it is worth noting that the pressure regulating assembly includes a piston 9 which slides in the contraction groove 8. The inner wall of the piston 9 away from the air bag 7 is vertically fixed with an inner threaded cylinder 10. The inner threaded cylinder 10 is connected with an outer threaded rod 11 in a threaded manner. One end of the outer threaded rod 11 is rotatably penetrated through the sealing cover 5 and is fixed with a control block 12.

[0032] The knob control block 12 makes the outer threaded rod 11 rotate inside the contraction groove 8. The inner threaded cylinder 10 can slide along the outer threaded rod 11 under the threaded structure. The piston 9 is pulled to move to the deep part inside the contraction groove 8, the air inside the air bag 7 is sucked, and the air pressure inside the air bag 7 is reduced.

[0033] On the contrary, the control block 12 is reversed, the piston 9 slides reversely, and the piston 9 can squeeze the sucked air into the air bag 7, so that the air pressure inside the air bag 7 is increased.

[0034] Further, as shown in Figure 4 and Figure 5 , it is worth noting that the outer wall of the inner threaded cylinder 10 is sleeved with a limiting ring 13. The inner wall of the limiting ring 13 is provided with a sliding groove. The limiting ring 13 is fixed to the inner wall of the contraction groove 8 through a support.

[0035] Through the setting of the limiting ring 13 and the limiting strip 14, when the outer threaded rod 11 rotates, the limiting ring 13 cooperates with the limiting strip 14 to effectively limit the trajectory of the inner threaded cylinder 10, so that the inner threaded cylinder 10 can only linearly slide along the outer threaded rod 11, so as to prevent the inner threaded cylinder 10 from rotating with the outer threaded rod 11.

[0036] Further, with reference to Figure 3 It is worth mentioning that the closure cover 5 is detachably connected with the top end surface of the capacitor end cover 2.

[0037] The bottom end of the closure cover 5 is provided with an annular mounting groove, and a positioning screw sleeve 6 fixedly connected with the top end of the capacitor end cover 2 is threadedly connected in the annular mounting groove.

[0038] Through the positioning screw sleeve 6, when the closure cover 5 contacts the threading part 3, the closure cover 5 is then manually rotated, and the positioning screw sleeve 6 is screwed into the annular mounting groove under the thread structure. Thus, by using the fastening characteristics of the thread structure and the positioning function of the annular mounting groove, the close and stable connection effect between the closure cover 5 and the threading part 3 can be achieved, and the sealing and reliability of the closure cover 5 in the actual operation process can be ensured, greatly reducing the possibility of problems such as oxidation of the threading part 3 caused by loose connection.

[0039] The basic principle, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection required by the present application is defined by the appended claims and their equivalents.

Claims

1. A metallized film capacitor for an AC motor, comprising a capacitor aluminum shell (1), a capacitor end cap (2) disposed on the top of the capacitor aluminum shell (1), a wire threading portion (3) fixedly connected to the capacitor end cap (2), and a wire harness (4) passing through the wire threading portion (3), wherein the wire threading portion (3) fixes the wire harness (4) together by crimping, characterized in that, It also includes a protective mechanism for reducing the oxidation degree of the threading part (3); The protective mechanism includes a closed cover (5) provided with a circular sleeving hole, the threading part (3) is located in the inner side of the closed cover (5), and the closed cover (5) is sleeved on the wire body of the wire harness (4) through the circular sleeving hole, a close-fitting sealing part is arranged between the wire harness (4) and the inner wall of the circular sleeving hole, and the closed cover (5) is detachably connected with the top end surface of the capacitor end cover (2).

2. A metallized film capacitor for an alternating current motor as defined in claim 1, characterized in that The close-fitting sealing part is mainly composed of an air bag (7) and a pressure regulating assembly, the air bag (7) is sleeved on the wire body of the wire harness (4) and is fixedly connected with the inner wall of the circular sleeving hole, and the inner wall of the top of the closed cover (5) is further provided with a contraction groove (8) in communication with the inside of the air bag (7), and the pressure regulating assembly is located in the contraction groove (8).

3. A metallized film capacitor for an alternating current motor as defined in claim 2, wherein The pressure regulating assembly includes a piston (9) sliding in the contraction groove (8), the back of the piston (9) away from the air bag (7) is fixedly provided with an internally threaded cylinder (10), an externally threaded rod (11) is threadedly connected in the internally threaded cylinder (10), and one end of the externally threaded rod (11) is rotatably arranged out of the closed cover (5) and is fixedly provided with a control block (12).

4. A metallized film capacitor for an alternating current motor as defined in claim 3, wherein The outer wall of the internally threaded cylinder (10) is sleeved with a limiting ring (13), the inner wall of the limiting ring (13) is provided with a sliding groove, the limiting strip (14) fixedly connected with the outer wall of the internally threaded cylinder (10) is slidingly arranged in the sliding groove, and the limiting ring (13) is fixedly connected with the inner wall of the contraction groove (8) through a support.

5. A metallized film capacitor for an alternating current motor as defined in claim 1, wherein The bottom end of the closed cover (5) is provided with an annular mounting groove, and the annular mounting groove is threadedly connected with a positioning screw sleeve (6) fixedly connected with the top end of the capacitor end cover (2).

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