Thermal protector for draining pump motor

Abstract

The utility model relates to the technical field of thermal protectors, in particular to a draining pump motor thermal protector, which comprises a shell, a support seat and a metal plate, the support seat and the metal plate are arranged in the shell, the metal plate is fixedly connected with the support seat through a buckle structure, better mechanical stability is provided, and assembly looseness caused by vibration or temperature change is reduced. A mounting groove is formed in the side, facing the metal plate, of the supporting seat, the mounting groove is matched with the metal plate to define a containing cavity, a moving contact and a static contact plate are oppositely arranged in the containing cavity, and the moving contact is arranged on the bimetallic strip and electrically connected with the metal plate through the bimetallic strip; the bimetallic strip automatically bends when the temperature changes, thereby controlling the contact and separation of the moving contact and the static contact plate, and achieving the automatic monitoring and protection of the temperature of the motor. And the first connecting plate and the second connecting plate are respectively used for connecting the static contact plate, the metal plate and the wiring terminals, so that different wiring terminals can be conveniently selected to adapt to different wiring modes and application scenes, and the universality and the flexibility are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of thermal protector, especially relates to a drainage pump motor thermal protector. BACKGROUND

[0002] As the key equipment in modern industry and civil water supply system, the efficient and stable operation of water pump is very important for guaranteeing production process, daily life water and agricultural irrigation. The performance of water pump directly depends on the motor that provides power for it, so the running state of the motor becomes the core factor affecting the working efficiency and safety of water pump. During the operation of water pump motor, overheat phenomenon may be caused due to excessive load, poor use environment, bearing wear, winding aging, fan failure and other reasons, which not only reduces the working efficiency of the motor and shortens the service life, but also may cause serious safety accidents such as motor burning, circuit short circuit and even fire.

[0003] In view of the potential threat of the above-mentioned overheating problem to water pump motor, at present, the thermal protector is installed to protect the motor from overheating damage, the motor temperature is monitored in real time through the thermal protector, and the power is automatically cut off once the preset threshold is exceeded, so as to prevent the motor from overheating damage. At present, the thermal protector has certain limitations in design and application. Considering the wiring requirement of the thermal protector, the connecting structure is usually arranged at one end of the length thereof and is arranged as a clamping groove structure to facilitate the clamping and fixing of the lead wire outer ring, but the clamping groove structure is not convenient for further connecting the wiring terminal to adapt to more application scenarios. The metal sheet inside the protector needs to be provided with a connecting structure, so that only the width direction is usually limited, and the length direction is lacking in limitation. Although the installation is simple, the internal structure is prone to displacement in the long-term use process due to factors such as vibration and temperature change, which affects the reliability and stability of the protection.

[0004] The information disclosed in this BACKGROUND section is only intended to enhance the understanding of the general background of the present disclosure and is not intended to be a recognition or any form of suggestion that this information constitutes prior art. SUMMARY

[0005] The utility model discloses a drainage pump motor thermal protector to solve the technical problem of the prior art.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the technical scheme that

[0007] A drainage pump motor thermal protector, comprising a shell, a support seat and a metal plate arranged in the shell, the metal plate is fixedly connected with the support seat through a buckle structure, and the support seat is made of insulating material.

[0008] A mounting groove is formed on the side of the support base facing the metal plate, and the mounting groove cooperates with the metal plate to form an accommodating cavity, a movable contact and a static contact plate are oppositely arranged in the accommodating cavity, the movable contact is arranged on a bimetallic strip and is electrically connected to the metal plate through the bimetallic strip.

[0009] A first connecting plate and a second connecting plate are arranged on the side of the support base and the metal plate close to the opening of the shell, respectively, the static contact plate is electrically connected to a first wiring terminal through the first connecting plate, and the metal plate is electrically connected to a second wiring terminal through the second connecting plate.

[0010] Further, the buckle structure comprises a clamping groove and a clamping plate arranged on the support base and the metal plate, respectively, a plurality of clamping grooves are arranged on both sides of the width of the support base, and a plurality of clamping plates are arranged corresponding to the clamping grooves.

[0011] Further, the clamping groove is located at the width edge of the side of the support base away from the mounting groove, the width of the metal plate is folded to form a folded edge toward the support base, the folded edge is attached to the side wall of the support base, and the clamping plate is arranged on the folded edge.

[0012] Further, a first recess is formed in the bottom of the mounting groove, and the static contact plate is arranged in the first recess.

[0013] A second recess is arranged on the metal plate, and a boss is arranged in the second recess, and the top of the boss abuts against the bimetallic strip.

[0014] Further, a third limiting hole is formed on the side of the support base close to the opening of the shell, and the first connecting plate is connected to the static contact plate through the third limiting hole.

[0015] Further, the bimetallic strip comprises a fixed part and a deformation part, the fixed part is located at one end of the length of the deformation part, the movable contact is arranged at the end of the deformation part away from the fixed part and abutting against the boss, and the second recess is arranged corresponding to the deformation part.

[0016] The mounting groove is arranged as a first limiting part and a second limiting part corresponding to the fixed part and the deformation part, the depth of the first limiting part is smaller than the depth of the second limiting part, and the first limiting part cooperates with the metal plate to press and fix the fixed part from both sides of the bimetallic strip.

[0017] Further, an end cover is arranged at one end of the support base close to the shell opening, the end cover is matched with the inner wall of the shell, a first limiting hole and a second limiting hole are respectively arranged on the end cover corresponding to the first connecting plate and the second connecting plate, and the first limiting hole is communicated with the first groove through the third limiting hole.

[0018] Further, one end of the first and second wiring terminals is respectively riveted with the first and second connecting plates.

[0019] The utility model discloses the beneficial effects are:

[0020] In the application, the metal plate and the support base are fixed tightly through the buckle structure, better mechanical stability is provided, the tight connection between the metal plate and the support base is ensured, and the assembly looseness caused by vibration or temperature change is reduced.

[0021] A relatively closed deformation space is formed between the metal plate and the support base, and the stability and reliability of the contact point are ensured. The bimetallic strip can automatically bend when the temperature changes due to the difference in thermal expansion coefficients of different metals, so as to control the contact and separation of the moving contact and the static contact plate, and realize automatic monitoring and protection of the motor temperature.

[0022] The first and second connecting plates are respectively used for connecting the static contact plate and the metal plate with the wiring terminal, the circuit is connected more conveniently and quickly through the wiring terminal, the thermal protector can adapt to different wiring modes and application scenarios by selecting different wiring terminals, and the universality and flexibility of the thermal protector are improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments in the utility model, and those skilled in the art can obtain other drawings according to these drawings without creating creative labor.

[0024] Figure 1 It is a schematic view of the thermal protector of the drainage pump motor in the utility model;

[0025] Figure 2 It is a schematic view of the internal structure of the thermal protector of the drainage pump motor in the utility model;

[0026] Figure 3 It is an explosion schematic view of the thermal protector of the drainage pump motor in the utility model;

[0027] Figure 4 It is a structural schematic view of the support base in the utility model;

[0028] Figure 5 It is the cross section schematic view of the drainage pump motor thermal protector in the utility model;

[0029] Figure 6 It is another wiring terminal schematic view of the drainage pump motor thermal protector in the utility model.

[0030] Label: 1, shell; 2, support seat; 21, installation groove; 211, first limiting part; 212, second limiting part; 22, first recess; 23, third limiting hole; 24, first connecting plate; 25, end cover; 251, first limiting hole; 252, second limiting hole; 3, metal plate; 31, second recess; 32, boss; 33, folded edge; 34, second connecting plate; 41, static contact plate; 42, movable contact; 5, bimetallic strip; 51, fixed part; 52, deformation part; 6, buckle structure; 61, clamping groove; 62, clamping plate; 7, containing cavity; 8, first wiring terminal; 9, second wiring terminal. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.

[0032] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or there can be intervening elements. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can be present. The terms "vertical", "horizontal", "left", "right", and the like as used herein are used for illustration only and are not intended to be limiting.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used in this description, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0034] As Figures 1 to 6The illustrated drainage pump motor thermal protector includes a shell 1 and a support seat 2 and a metal plate 3 arranged therein, the metal plate 3 is fixedly connected with the support seat 2 through a buckle structure 6, the support seat 2 is made of insulating material; a mounting groove 21 is formed on the side of the support seat 2 facing the metal plate 3, the mounting groove 21 cooperates with the metal plate 3 to form an accommodating cavity 7, a moving contact 42 and a static contact plate 41 are oppositely arranged in the accommodating cavity 7, the moving contact 42 is arranged on a bimetallic strip 5 and is electrically connected with the metal plate 3 through the bimetallic strip 5; a first connecting plate 24 and a second connecting plate 34 are respectively arranged on the side of the support seat 2 and the metal plate 3 close to the opening of the shell 1, the static contact plate 41 is electrically connected with a first wiring terminal 8 through the first connecting plate 24, and the metal plate 3 is electrically connected with a second wiring terminal 9 through the second connecting plate 34.

[0035] In the present application, the metal plate 3 and the support seat 2 are tightly fixed through the buckle structure 6, better mechanical stability is provided, the tight connection between the metal plate 3 and the support seat 2 is ensured, and the assembly looseness caused by vibration or temperature change is reduced.

[0036] The support seat 2 is made of insulating material, which can effectively isolate the direct electrical contact between the metal plate 3 and the static contact plate 41 in the internal space of the shell 1, and ensure the electrical safety of the thermal protector.

[0037] The accommodating cavity 7 provides a relatively closed deformation space for the thermal expansion and cold contraction of the bimetallic strip 5, ensuring the stability and reliability of the contact. The bimetallic strip 5 utilizes the difference in thermal expansion coefficients of different metals to automatically bend when the temperature changes, thereby controlling the contact and separation of the moving contact 42 and the static contact plate 41, and realizing automatic monitoring and protection of the motor temperature.

[0038] The first connecting plate 24 and the second connecting plate 34 are respectively used for connecting the static contact plate 41 and the metal plate 3 with the wiring terminal, the circuit connection through the wiring terminal is more convenient and fast, and the thermal protector can also adapt to different wiring methods and application scenarios by selecting different wiring terminals, thereby improving the versatility and flexibility of the thermal protector.

[0039] In the present embodiment, the buckle structure 6 includes a clamping groove 61 and a clamping plate 62 arranged on the support seat 2 and the metal plate 3 respectively, the clamping groove 61 is provided with a plurality of clamping grooves 61 on both sides of the width of the support seat 2, and the clamping plate 62 is provided with a plurality of clamping plates 62 corresponding to the clamping grooves 61. Referring to Figure 3 As shown in the figure, the clamping groove 61 is located at the width edge of the side of the support seat 2 away from the mounting groove 21, the width of the metal plate 3 is folded to form a folded edge 33 toward the support seat 2, the folded edge 33 is fitted with the side wall of the support seat 2, and the clamping plate 62 is arranged on the folded edge 33.

[0040] The folded edge 33 of the metal plate 3 is tightly attached to the side wall of the support base 2 and is fixed by being clamped in the clamping groove 61 on the support base 2 through the clamping plate 62 on the metal plate 3, thereby further enhancing the connection stability between the metal plate 3 and the support base 2 and forming a relatively sealed accommodating cavity 7 between the metal plate 3 and the support base 2 for mounting the bimetallic strip 5, thereby further improving the stability of the thermal protector.

[0041] In the present embodiment, the first recess 22 is formed at the bottom of the mounting groove 21, and the static contact plate 41 is arranged in the first recess 22; the second recess 31 is arranged on the metal plate 3, and the boss 32 is arranged in the second recess 31, and the top of the boss 32 abuts against the bimetallic strip 5.

[0042] The arrangement of the first recess 22 and the second recess 31 provides sufficient deformation space for the bimetallic strip 5 at high temperature. When the temperature rises, the bimetallic strip 5 can freely bend and will not be hindered due to space limitation, thereby ensuring that it can accurately trigger the disconnection action of the thermal protector and improving the reliability and sensitivity of the bimetallic strip 5 at high temperature.

[0043] Further, as shown in Figure 4 the third limiting hole 23 is formed on the side of the support base 2 close to the opening of the shell 1, and the first connecting plate 24 is connected to the static contact plate 41 through the third limiting hole 23. The bimetallic strip 5 includes a fixed part 51 and a deformation part 52, the fixed part 51 is located at one end of the deformation part 52, the movable contact 42 is arranged at the end of the deformation part 52 away from the fixed part 51 and abutting against the boss 32, and the second recess 31 is arranged corresponding to the deformation part 52; the mounting groove 21 is provided with a first limiting part 211 and a second limiting part 212 corresponding to the fixed part 51 and the deformation part 52, the depth of the first limiting part 211 is smaller than the depth of the second limiting part 212, and the first limiting part 211 cooperates with the metal plate 3 to tightly fix the fixed part 51 from both sides of the bimetallic strip 5.

[0044] Through the different depth design of the first limiting part 211 and the second limiting part 212, after the metal plate 3 is fixedly connected to the support base 2, the fixed part 51 of the bimetallic strip 5 is tightly fixed, and at the same time, the deformation part 52 can be effectively limited by the second limiting part 212 cooperating with the second recess 31, thereby further avoiding the position deviation of the bimetallic strip 5 due to vibration or temperature change. Therefore, the first limiting part 211 and the second limiting part 212 in the mounting groove 21 not only ensure the stability of the bimetallic strip 5 during installation, but also ensure the reliability of the bimetallic strip 5 during operation.

[0045] In the present embodiment, as shown in Figure 4 and Figure 5As shown, the support base 2 is provided with an end cover 25 at one end close to the opening of the shell 1, the end cover 25 is matched with the inner wall of the shell 1, and the first limiting hole 251 and the second limiting hole 252 are respectively arranged on the end cover 25 corresponding to the first connecting plate 24 and the second connecting plate 34, and the first limiting hole 251 is connected with the first recess 22 through the third limiting hole 23.

[0046] The close matching of the end cover 25 and the inner wall of the shell 1 enhances the closure of the inside of the thermal protector, prevents the external dust, moisture or other impurities from entering the inside of the thermal protector, causes damage to the internal components, improves the durability and reliability of the thermal protector.

[0047] In the embodiment, one end of the first wiring terminal 8 and the second wiring terminal 9 is respectively riveted with the first connecting plate 24 and the second connecting plate 34. The wiring terminal is connected with the connecting plate through riveting, so that the wiring terminal can adopt various shapes, such as Figure 1 the fishhook type shown, Figure 6 the cantilever structure provided with buckles shown, greatly improving the flexibility of wiring.

[0048] The riveting of the wiring terminal with the connecting plate of the protector ensures firm and not easy to loosen connection, and can also maintain stable connection in the vibration or impact environment.

[0049] Those skilled in the art should understand that the utility model is not limited by the above-mentioned embodiments, the above-mentioned embodiments and the description in the specification are only to illustrate the principle of the utility model, various changes and improvements of the utility model can be made without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed.The scope of protection of the utility model is defined by the appended claims and their equivalents.

Claims

1. A drainage pump motor thermal protector, characterized in that: It comprises a housing (1), a support base (2) and a metal plate (3) arranged therein, wherein the metal plate (3) is fixedly connected to the support base (2) via a snap-fit ​​structure (6), and the support base (2) is made of an insulating material; A mounting groove (21) is provided on one side of the support seat (2) facing the metal plate (3), and the mounting groove (21) cooperates with the metal plate (3) to enclose a receiving cavity (7), wherein a moving contact (42) and a stationary contact plate (41) are relatively arranged in the receiving cavity (7), and the moving contact (42) is arranged on the bimetallic strip (5) and is electrically connected to the metal plate (3) through the bimetallic strip (5); A first connecting plate (24) and a second connecting plate (34) are respectively provided on the support seat (2) and the metal plate (3) on a side close to the opening of the housing (1); the static contact plate (41) is electrically connected to the first terminal (8) via the first connecting plate (24); and the metal plate (3) is electrically connected to the second terminal (9) via the second connecting plate (34).

2. The drain pump motor thermal protector according to claim 1, characterized in that: The snap-fit ​​structure (6) comprises a snap-fit ​​groove (61) and a snap-fit ​​plate (62) respectively arranged on the support seat (2) and the metal plate (3); a plurality of the snap-fit ​​grooves (61) are arranged on both sides of the width of the support seat (2); and a plurality of the snap-fit ​​plates (62) are arranged corresponding to the snap-fit ​​grooves (61).

3. The drain pump motor thermal protector according to claim 2, characterized in that: The card slot (61) is located at the width edge of the support seat (2) on the side facing away from the installation slot (21), and the width sides of the metal plate (3) are folded toward the support seat (2) to form folded edges (33), and the folded edges (33) are in contact with the side walls of the support seat (2), and the card plate (62) is arranged on the folded edges (33).

4. The drain pump motor thermal protector according to claim 1, characterized in that: A first groove (22) is provided at the bottom of the mounting groove (21), and the stationary contact plate (41) is arranged in the first groove (22); A second groove (31) is provided on the metal plate (3), a boss (32) is provided in the second groove (31), and the top of the boss (32) abuts against the bimetallic strip (5).

5. The drain pump motor thermal protector according to claim 4, characterized in that: A third limiting hole (23) is provided on one side of the support seat (2) close to the opening of the housing (1), and the first connecting plate (24) is connected to the static contact plate (41) through the third limiting hole (23).

6. The drain pump motor thermal protector according to claim 5, characterized in that: The bimetallic strip (5) comprises a fixed portion (51) and a deformable portion (52), wherein the fixed portion (51) is located at one end of the length of the deformable portion (52), the movable contact (42) is arranged at an end of the deformable portion (52) and away from the fixed portion (51) at a point where the deformable portion (52) and the boss (32) abut against each other, and the second groove (31) is arranged corresponding to the deformable portion (52); The mounting groove (21) is configured as a first limiting portion (211) and a second limiting portion (212) corresponding to the fixing portion (51) and the deforming portion (52); the depth of the first limiting portion (211) is less than the depth of the second limiting portion (212); the first limiting portion (211) cooperates with the metal plate (3) to press and fix the fixing portion (51) from both sides of the bimetallic strip (5).

7. The drain pump motor thermal protector according to claim 5, characterized in that: An end cover (25) is provided at one end of the support seat (2) close to the opening of the shell (1), and the end cover (25) is matched with the inner wall of the shell (1). A first limiting hole (251) and a second limiting hole (252) are respectively provided on the end cover (25) corresponding to the first connecting plate (24) and the second connecting plate (34), and the first limiting hole (251) is connected to the first groove (22) through the third limiting hole (23).

8. The drain pump motor thermal protector according to claim 1, characterized in that: One end of the first connecting terminal (8) and the second connecting terminal (9) are riveted to the first connecting plate (24) and the second connecting plate (34) respectively.

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