Pressing self-locking water pump circuit board structure

Abstract

The utility model discloses a press self -locking formula water pump circuit board structure, install in the circuit board installation cavity in water pump pump shell, aims at solving traditional rigid fixed structure installation efficiency low etc. Its structure includes the installation post and the symmetrical setting upper spring piece, lower spring piece: the installation post lower extreme is fixed in the installation cavity bottom wall, and both sides have the vertical connecting groove, the upper spring piece is triangular, and the middle lower part stretches out the connecting groove and forms the horn shape positioning assembly of upper small lower big, and the lower spring piece corresponds and forms the horn shape assembly of lower small upper big, and the interval of two is matched with the thickness of circuit board. When installing, circuit board is pressed down along the upper spring piece guide inclined plane, forces the upper spring piece to contract, realizes the two -way elastic clamping of upper and lower through the rear spring piece reset, and the cooperation lower spring piece is blocked and positioned, and the automatic self -locking is completed. The structure spares the artificial sighting, and the step of aligning and correcting, and the assembly time is short, adapts the automatic production, reduces the vibration failure rate simultaneously, is applicable to the scene of new energy automobile, intelligent house etc. to water pump miniaturization, high reliability requirement.

Description

Technical Field

[0001] This utility model belongs to the field of water pump technology, specifically relating to an installation structure for a press-locking water pump circuit board, which is particularly suitable for small fluid transfer pumps that require high assembly efficiency and vibration resistance. Background Technology

[0002] As the core component of a fluid transport system, the stability of a water pump's operation directly depends on the reliability of its internal electronic components. As the control center, the rationality of the circuit board's installation structure is crucial to ensuring signal transmission, vibration resistance, and assembly efficiency.

[0003] In existing technologies, water pump circuit boards are mainly fixed by rigid connection structures such as hot riveting, soldering, or screw fastening. These structures achieve physical fixation by directly welding or riveting the circuit board to the metal bracket on the inner wall of the pump casing using mechanical force. In early low-power, low-vibration water pump scenarios, this could meet basic usage requirements. Its technical significance lies in ensuring a rigid connection between the circuit board and the pump body through mature processes, avoiding the risk of loosening.

[0004] I. Shortcomings of existing technologies

[0005] 1. Installation efficiency is low, relying on manual calibration.

[0006] Traditional rigid connection structures require manual positioning of the circuit board and bracket before hot riveting or welding. Due to the confined space inside the water pump, manual operation easily leads to circuit board misalignment (often by 0.1–0.3 mm), requiring repeated corrections and increasing assembly time by more than 30%. For example, the circuit board installation process for a certain model of water pump requires two workers to complete, with a single unit assembly time exceeding 5 minutes, making it difficult to meet the cycle time requirements of automated production lines.

[0007] 2. Insufficient vibration resistance, which can easily lead to circuit failure.

[0008] The periodic vibrations (frequency 50–200 Hz, amplitude 0.05–0.2 mm) generated during water pump operation are transmitted to the circuit board through the rigid support, leading to solder joint fatigue and detachment or circuit breakage. Statistical data shows that after 3000 hours of continuous operation, vibration accounts for as much as 45% of circuit board failures in water pumps with traditional fixed structures, significantly reducing product reliability.

[0009] II. Analysis of the Causes of Inadequacies in Existing Technologies

[0010] Existing technologies focus on the design logic of "rigid connection - structural strength," with the core being the rigid fixation of the circuit board to the pump housing using non-deformable metal supports (such as hot-riveted pillars and welding points), without considering the possibility of "elastic compensation - automatic adaptation." For example, in traditional structures, the gap between the circuit board and the support needs to be adjusted manually using shims, and the structure itself cannot achieve self-adaptation to thickness tolerances (±0.05mm), thus requiring manual intervention. In contrast, this invention establishes a novel technical approach that achieves automatic locking of the circuit board after installation through an elastic combination structure of "compressible spring (upper spring) + fixed spring (lower spring)."

[0011] III. The Necessity of Improvement

[0012] With the increasing demand for miniaturized and highly reliable water pumps in fields such as new energy vehicles and smart homes (e.g., vehicle-mounted water pumps require a lifespan of ≥10,000 hours and an assembly cycle of ≤60 seconds per unit), traditional rigid fixing structures can no longer meet the dual requirements of "high-efficiency assembly" and "vibration resistance and stability." There is an urgent need for a circuit board fixing structure that can achieve automatic positioning, adapt to thickness tolerances, and has vibration buffering capabilities to overcome the technical bottlenecks of high reliance on manual labor and high failure rates in existing technologies—this is precisely the core objective that this utility model aims to achieve through its innovative "elastic clamping self-locking" design. Utility Model Content

[0013] The purpose of this utility model is to provide a press-locking water pump circuit board structure to solve the problems of low installation efficiency and insufficient vibration resistance stability caused by the reliance on manual correction in the traditional water pump circuit board fixing structure.

[0014] To achieve the above objectives, the self-locking push-button water pump circuit board structure of this utility model is installed in the circuit board mounting cavity inside the pump casing of the water pump. It includes a mounting post, the lower end of which is connected to a fixing structure of the circuit board mounting cavity. The mounting post has two vertically extending connecting grooves symmetrically arranged on its left and right sides, each groove containing an upper spring and a lower spring, respectively.

[0015] The upper part of the upper spring piece is located in the connecting groove and the lower part extends radially out of the connecting groove; the lower part of the lower spring piece is located in the connecting groove and the upper part extends radially out of the connecting groove.

[0016] Two upper spring pieces form an upper positioning component that is shaped like a horn with a smaller upper part and a larger lower part, and two lower spring pieces form a lower positioning component that is shaped like a horn with a smaller lower part and a larger upper part.

[0017] The upper surface of the upper positioning component forms a guide slope. The distance between the upper positioning component and the lower positioning component matches the thickness of the circuit board. The circuit board is automatically clamped by the elastic contraction and reset of the upper spring piece, and the positioning is achieved by the support and blocking of the lower spring piece.

[0018] Both the upper and lower spring sheets are triangular elastic structures. The lower middle part of the upper spring sheet extends out of the connecting groove by a length that is 1.0-1.5 times the depth of the connecting groove, and the upper middle part of the lower spring sheet extends out of the connecting groove by a length that is 1.0-1.5 times the depth of the connecting groove.

[0019] This utility model has the following advantages:

[0020] The upper positioning component is flared, wider at the bottom than the top, creating a guide slope on its upper surface (the upper surfaces of the two upper spring tabs). When the mounting hole sleeve of the circuit board slides downwards on the mounting post, it encounters the two upper spring tabs and naturally compresses them downwards along the guide slope, causing them to retract into the connecting groove. After the circuit board passes through the two upper spring tabs, the two upper spring tabs return to their original shape under the action of elasticity, clamping the circuit board downwards. At the same time, the circuit board is blocked and positioned by the two lower spring tabs. The upper and lower spring tabs clamp and position the circuit board simultaneously in both vertical and horizontal directions.

[0021] With the structure of this utility model, operators no longer need to "aim, align" and fine-tune the position of the circuit board when installing it. They only need to fit the mounting holes on the circuit board onto the mounting posts, and then press the circuit board from top to bottom until it passes through the two upper spring tabs and is blocked by the two lower spring tabs. Then they can release it. The installation difficulty is greatly reduced and the installation efficiency is greatly improved. After installation, the upper and lower spring tabs clamp and position the circuit board in both vertical and horizontal directions. This not only positions the circuit board well, but also allows the circuit board to move slightly in the vertical direction due to the elasticity of the upper and lower spring tabs, thereby reducing the vibration force and improving the vibration resistance. After the slight displacement, the circuit board will still return to its original position due to the elasticity of the upper and lower spring tabs.

[0022] The upper spring piece has a triangular elastic structure (smaller at the top and larger at the bottom), which makes it easy to retract into the connecting groove when the circuit board passes downwards; the lower spring piece has a triangular elastic structure (larger at the top and smaller at the bottom), which makes it easy to support and position the circuit board and prevent it from being pressed into the connecting groove by the circuit board. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model assembled with a circuit board.

[0024] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0025] Figure 3 yes Figure 1 Top view.

[0026] Figure 4 yes Figure 3 AA sectional view.

[0027] Figure 5 yes Figure 4 BB cross-sectional view.

[0028] Figure 6 This is a three-dimensional structural diagram of the present invention. Detailed Implementation

[0029] like Figures 1 to 6 As shown, this utility model provides a press-to-lock water pump circuit board structure, which is installed in a circuit board mounting cavity inside the pump casing of the water pump. It includes a mounting post 1, the lower end of which is connected to a fixing structure of the circuit board mounting cavity (such as the bottom wall of the circuit board mounting cavity). Two vertically extending connecting grooves 2 are symmetrically arranged on the mounting post 1, and each connecting groove 2 contains an upper spring piece 3 and a lower spring piece 4. The pump casing and the circuit board mounting cavity inside it are prior art and not part of this utility model; therefore, they are not shown in the figure.

[0030] The upper part of the upper spring piece 3 is located inside the connecting groove 2 and the lower part extends radially out of the connecting groove 2; the lower part of the lower spring piece 4 is located inside the connecting groove 2 and the upper part extends radially out of the connecting groove 2.

[0031] Two upper spring pieces 3 form an upper positioning component that is shaped like a horn with a smaller upper part and a larger lower part, and two lower spring pieces 4 form a lower positioning component that is shaped like a horn with a smaller lower part and a larger upper part.

[0032] The upper surface of the upper positioning component forms a guide slope. The distance between the upper and lower positioning components matches the thickness of the circuit board 5. The circuit board 5 is automatically clamped by the elastic contraction and reset of the upper spring 3, and positioned by the support and blocking of the lower spring 4. This allows for slight displacement of the circuit board 5 in the vertical direction to buffer vibration.

[0033] The upper positioning component is flared, wider at the bottom than at the top, so that the upper surface of the upper positioning component (the upper surfaces of the two upper spring pieces 3) forms a guide slope. When the mounting hole sleeve of the circuit board 5 slides downward on the mounting post 1, it will naturally compress the two upper spring pieces 3 downward along the guide slope when it encounters them, causing the two upper spring pieces 3 to retract into the connecting groove 2. After the circuit board 5 passes through the two upper spring pieces 3, the two upper spring pieces 3 return to their original shape under the action of elasticity, clamping the circuit board 5 downward. At the same time, the circuit board 5 is blocked and positioned by the two lower spring pieces 4. The upper spring pieces 3 and the lower spring pieces 4 clamp and position the circuit board 5 in both the upper and lower directions.

[0034] With the structure of this utility model, operators no longer need to "aim, align" and fine-tune the position of the circuit board 5 when installing it. They only need to fit the mounting hole on the circuit board 5 onto the mounting post 1, and then press the circuit board 5 from top to bottom until it passes through the two upper spring pieces 3 and is blocked by the two lower spring pieces 4. Then they can release it. The installation difficulty is greatly reduced and the installation efficiency is greatly improved. After installation, the upper spring pieces 3 and lower spring pieces 4 clamp and position the circuit board 5 in both the vertical and horizontal directions. This not only positions the circuit board 5 well, but also allows the circuit board 5 to move slightly in the vertical direction due to the elasticity of the upper spring pieces 3 and lower spring pieces 4, thereby reducing the vibration force and improving the vibration resistance. After the slight displacement, the circuit board 5 will still return to its original position due to the elasticity of the upper spring pieces 3 and lower spring pieces 4.

[0035] Both the upper spring piece 3 and the lower spring piece 4 are triangular elastic structures. The length of the lower middle part of the upper spring piece 3 extending out of the connecting groove 2 is 1.0-1.5 times the depth of the connecting groove 2 (including the two ends). The length of the upper middle part of the lower spring piece 4 extending out of the connecting groove 2 is 1.0-1.5 times the depth of the connecting groove 2 (including the two ends).

[0036] The upper spring piece 3 has a triangular elastic structure (smaller at the top and larger at the bottom), which makes it easy to retract into the connecting groove 2 when the circuit board 5 passes downward; the lower spring piece 4 has a triangular elastic structure (larger at the top and smaller at the bottom), which makes it easy to support and position the circuit board 5 and prevent it from being pressed into the connecting groove 2 by the circuit board 5.

[0037] Both the upper spring 3 and the lower spring 4 are preferably made of beryllium copper alloy. Beryllium copper alloy has high elastic modulus (≥120GPa) and fatigue strength, ensuring that the springs maintain stable elasticity under long-term vibration environment of water pump (10,000 cycles test) and avoid fixation failure caused by metal fatigue.

[0038] I. Summary of the structural composition and working principle of this utility model

[0039] The core components of this structure are the mounting post 1 and the symmetrically arranged upper spring plate 3 and lower spring plate 4:

[0040] Mounting column 1: The lower end is fixed to the bottom wall of the circuit board mounting cavity inside the pump casing. Vertical connecting grooves 2 are opened on both sides of the column to accommodate the upper spring piece 3 and the lower spring piece 4, respectively.

[0041] Upper spring piece 3: Triangular elastic structure, with the connecting groove 2 extending radially from the middle and lower part. The two pieces form a trumpet-shaped positioning component that is smaller at the top and larger at the bottom, and the upper surface forms a guide slope.

[0042] Lower spring piece 4: Also a triangular elastic structure, with the connecting groove 2 extending radially from the upper middle part. The two pieces form a trumpet-shaped positioning component that is smaller at the bottom and larger at the top, and the distance between the lower spring piece 3 and the upper spring piece 4 matches the thickness of the circuit board 5. The lower spring piece 4 is used to support the circuit board 5 upwards.

[0043] II. Installation and Self-Locking Process

[0044] Guiding and Compression: After the circuit board 5 is inserted into the mounting post 1 from top to bottom through its mounting hole, it is pressed down along the guide slope of the upper spring piece 3, forcing the upper spring piece 3 to contract into the connecting groove 2 (utilizing the elastic deformation characteristics of the triangular structure).

[0045] Automatic reset and clamping: After the circuit board 5 passes downward through the upper spring 3, the upper spring 3 returns to its original shape under the action of elasticity, clamping the circuit board 5 from above; at the same time, the lower end of the circuit board 5 is blocked and positioned by the lower spring 4, forming a bidirectional elastic clamping.

[0046] Self-locking complete: After releasing the hand, the circuit board 5 automatically locks under the coordinated action of the upper and lower springs 4, without the need for manual fine-tuning or additional fasteners.

[0047] III. Technical Effects and Advantages

[0048] The installation process eliminates the traditional "aiming-calibration" steps; installation can be completed simply by pressing. The assembly time for a single unit is reduced from more than 3 minutes to ≤60 seconds, making it compatible with the cycle time of automated production lines.

[0049] The installation process does not require manual adjustment of thickness tolerance (±0.05mm) with shims, as the structure itself achieves self-adaptation through the elasticity of the springs.

[0050] The spring is made of beryllium copper alloy (elastic modulus ≥120GPa), which has high fatigue strength and allows the circuit board 5 to generate micro-displacement in the vertical direction to buffer the periodic vibration of the water pump during operation (frequency 50~200Hz, amplitude 0.05~0.2mm).

[0051] After a slight displacement, the spring force can automatically reset the circuit board 5, preventing solder joints from falling off or circuits from breaking, and greatly reducing malfunctions caused by vibration.

[0052] The flared design of the upper spring 3 and the lower spring 4 forms a "one-way passage + two-way locking" mechanism, ensuring that there is no risk of loosening after the circuit board 5 is installed, while simplifying the disassembly and maintenance process.

[0053] This utility model breaks through the technical bottleneck of relying on manual positioning in traditional rigid connections by using an elastic combination structure of "upper spring 3 + lower spring 4", realizing the integrated function of "pressing-self-locking-buffering" and meeting the dual requirements of efficient assembly and vibration resistance stability. It is especially suitable for scenarios with stringent requirements for miniaturization and long service life (≥10,000 hours) of water pumps, such as new energy vehicles and smart homes.

[0054] The above embodiments are only used to illustrate and not limit the technical solutions of this utility model. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the utility model without departing from the spirit and scope of the utility model. Any modifications or partial substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A self-locking water pump circuit board structure, installed in a circuit board mounting cavity inside the pump casing of the water pump, characterized in that: The device includes a mounting post, the lower end of which is connected to a fixing structure of the circuit board mounting cavity. The mounting post has two vertically extending connecting grooves symmetrically arranged on its left and right sides, each groove containing an upper spring contact and a lower spring contact. The upper part of the upper spring piece is located in the connecting groove and the lower part extends radially out of the connecting groove; the lower part of the lower spring piece is located in the connecting groove and the upper part extends radially out of the connecting groove. Two upper spring pieces form an upper positioning component that is shaped like a horn with a smaller upper part and a larger lower part, and two lower spring pieces form a lower positioning component that is shaped like a horn with a smaller lower part and a larger upper part. The upper surface of the upper positioning component forms a guide slope. The distance between the upper positioning component and the lower positioning component matches the thickness of the circuit board. The circuit board is automatically clamped by the elastic contraction and reset of the upper spring piece, and the positioning is achieved by the support and blocking of the lower spring piece.

2. The self-locking press-type water pump circuit board structure according to claim 1, characterized in that: Both the upper and lower spring sheets are triangular elastic structures. The lower middle part of the upper spring sheet extends out of the connecting groove by a length that is 1.0-1.5 times the depth of the connecting groove, and the upper middle part of the lower spring sheet extends out of the connecting groove by a length that is 1.0-1.5 times the depth of the connecting groove.

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