Positioning type central air conditioner circulating pump with high self-locking performance

Abstract

The invention relates to the technical field of heating ventilation air conditioning equipment, in particular to a positioning type central air conditioning circulating pump with high self-locking performance, which comprises a pump body, a driving motor and a positioning self-locking mechanism, the positioning self-locking mechanism is arranged at the bottom of the pump body and comprises a sliding block, a bidirectional wedge-shaped locking assembly and an elastic reset unit, and the wedge-shaped inclined surface is matched with the positioning boss of the mounting base, so that automatic clamping and mechanical self-locking are realized under the action of the compression spring. Displacement and vibration in operation of the pump body can be effectively prevented, positioning stability and energy efficiency are improved, the structure is compact, electronic control is not needed, and the pump is suitable for long-term or frequent starting and stopping working conditions.

Description

Technical Field

[0001] This invention belongs to the field of HVAC equipment technology, specifically a self-locking, positioning-type central air conditioning circulation pump. Background Technology

[0002] During the operation of a central air conditioning system, the circulation pump is a key component, and its positioning stability and self-locking performance directly affect the system's safety and energy efficiency. Currently, there are various circulation pump structures available on the market for central air conditioning systems. Some products achieve positioning and locking functions through mechanical limits or electromagnetic braking. However, these solutions often suffer from decreased positioning accuracy and insufficient self-locking reliability during long-term operation, and are prone to loosening or displacement under frequent start-stop conditions.

[0003] Therefore, we made improvements and proposed a positioning-type central air conditioning circulation pump with stronger self-locking properties. Summary of the Invention

[0004] The purpose of this invention is to solve the problems of increased displacement, vibration, and decreased energy efficiency caused by loose positioning structure and unreliable self-locking mechanism in existing central air conditioning circulating pumps during operation.

[0005] To achieve the above-mentioned objectives and improve the aforementioned problems, this invention provides a positioning-type central air conditioning circulation pump with strong self-locking properties, comprising a pump body, a drive motor, and a positioning self-locking mechanism. The positioning self-locking mechanism is located at the bottom of the pump body and works in conjunction with a mounting base. The positioning self-locking mechanism includes a slider, a bidirectional wedge locking assembly, and an elastic reset unit. The slider is fixedly connected to the bottom surface of the pump body, the bidirectional wedge locking assembly is embedded inside the slider, and the elastic reset unit is located between the slider and the bidirectional wedge locking assembly. The bottom end of the slider has a guide groove that runs through its front and rear sides. The bidirectional wedge locking assembly includes a first wedge and a second wedge symmetrically arranged. The first wedge and the second wedge are slidably fitted onto the inner walls of the left and right sides of the guide groove, respectively. The opposite sides of the first wedge and the second wedge are provided with wedge-shaped inclined surfaces with an inclination angle of 15° to 25°. The two wedge-shaped inclined surfaces are attached to each other and form a V-shaped clamping structure, which is used to engage a pre-set positioning boss on the mounting base.

[0006] As a preferred technical solution of this application, the slider is provided with limiting through holes on the left and right sides, respectively, and an adjusting screw is inserted in the limiting through hole. One end of the adjusting screw is connected to the outer side of the corresponding wedge by a thread, and the other end extends to the outside of the slider and is fixedly connected to a knob. By rotating the knob, the adjusting screw moves axially along the limiting through hole, thereby pushing or pulling back the corresponding wedge to slide laterally along the guide groove.

[0007] As a preferred technical solution of this application, the elastic reset unit includes a compression spring and a guide post. The guide post is vertically fixed at the center of the inner bottom surface of the slider. The compression spring is sleeved on the outer periphery of the guide post, with one end abutting against the inner bottom surface of the slider and the other end abutting against the linkage pressure plate located between the first wedge and the second wedge. The left and right ends of the linkage pressure plate are fixedly connected to the inner surfaces of the first wedge and the second wedge, respectively. When the pump body is not installed on the base, the compression spring is in a naturally extended state. The first wedge and the second wedge remain close to each other under the action of the compression spring, so that the V-shaped clamping structure is in a closed state.

[0008] As a preferred technical solution of this application, the top surface of the mounting base is provided with an upwardly protruding rectangular positioning boss. The top two sides of the positioning boss are machined with chamfered bevels that match the wedge-shaped bevels of the first wedge and the second wedge. When the pump body is installed downwards onto the mounting base, the positioning boss is inserted into the V-shaped clamping structure, forcing the first wedge and the second wedge to slide outwards along the guide groove. The compression spring is further compressed. After the positioning boss is fully embedded, under the reaction force of the compression spring, the first wedge and the second wedge clamp the positioning boss inwards, forming a mechanical self-locking mechanism.

[0009] As a preferred technical solution of this application, rubber buffer pads are provided at the four corners of the bottom surface of the slider. The rubber buffer pads are fixedly connected to the slider by countersunk screws, which are used to absorb high-frequency vibrations and prevent direct metal contact from generating noise during the operation of the pump body.

[0010] As a preferred technical solution of this application, the outer surfaces of the first wedge and the second wedge are respectively provided with sliding guide rails, and the left and right inner walls of the guide groove are provided with guide grooves that cooperate with the sliding guide rails. The sliding guide rails are embedded in the guide grooves and slide along their length direction, restricting the displacement of the wedge in the vertical direction and allowing it to move only in the horizontal direction.

[0011] As a preferred technical solution of this application, the linkage pressure plate has a central hole that fits with the guide column with a clearance. The diameter of the central hole is 0.3mm to 0.8mm larger than the outer diameter of the guide column, so as to ensure that the linkage pressure plate can move smoothly along the axis of the guide column without deflection when subjected to force.

[0012] As a preferred technical solution of this application, a sealing ring is provided between the adjusting screw and the limiting through hole. The sealing ring is embedded in the annular groove on the inner wall of the limiting through hole to prevent external dust or coolant from entering the slider and affecting the sliding performance of the wedge.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: In the scheme of this application: The slider forms a mechanical interlock structure with the positioning boss on the mounting base through its internal bidirectional wedge locking assembly. When the pump body is installed in place, the first and second wedges automatically clamp the positioning boss under the action of the compression spring, achieving a reliable self-locking function without the need for additional electromagnetic devices or hydraulic systems. The setting of the adjusting screw makes the initial position of the wedge adjustable to adapt to mounting bases with different manufacturing tolerances. The cooperation between the guide groove and the sliding guide rail ensures that the wedge slides only in a predetermined direction, avoiding misalignment caused by vibration. The introduction of rubber buffer pads effectively isolates the vibration generated by the pump body during operation from being transmitted to the base, improving the overall operational stability. The entire positioning self-locking mechanism has a compact structure, is composed entirely of mechanical components, and has no electronic control components. Therefore, it can maintain stable locking force and positioning accuracy even under frequent start-stop or long-term operation conditions, solving the problems of self-locking failure and positioning offset caused by reliance on electromagnetic braking or simple limit structures in existing technologies. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of a self-locking, positioning-type central air conditioning circulation pump according to the present invention. Figure 2 for Figure 1 A schematic diagram of the structure of the center positioning self-locking mechanism in conjunction with the mounting base; Figure 3 This is a schematic diagram of the internal structure of the slider of the positioning self-locking mechanism, showing the assembly relationship between the bidirectional wedge locking assembly and the elastic reset unit; Figure 4 This is a three-dimensional structural diagram of the mounting base, highlighting the positioning boss and chamfered bevel at its top; Figure 5 This is a structural diagram showing the connection between the adjusting screw and the slider, illustrating the installation position of the sealing ring.

[0015] Figure 6 The diagram shows the mounting base and rubber buffer pad, illustrating their fit.

[0016] The attached figures are labeled as follows: 1. Pump body; 2. Drive motor; 3. Positioning self-locking mechanism; 4. Mounting base; 5. Slider; 6. First wedge; 7. Second wedge; 8. Compression spring; 9. Guide column; 10. Linkage pressure plate; 11. Adjusting screw; 12. Knob; 13. Limiting through hole; 14. Guide groove; 15. Positioning boss; 16. Rubber buffer pad; 17. Sealing ring. Detailed Implementation

[0017] This invention provides a self-locking, positionable central air conditioning circulating pump. The specific embodiments of this invention are described in detail below with reference to the accompanying drawings. Figure 1As shown, the circulating pump comprises a pump body 1, a drive motor 2, and a positioning self-locking mechanism 3 located at the bottom of the pump body 1. The pump body 1 and the drive motor 2 are fixedly connected by flanges or bolts, forming the main power and fluid transport component of the circulating pump. The positioning self-locking mechanism 3 is used to securely install the pump body 1 onto the mounting base 4 and maintain its positional stability during operation. The mounting base 4 is a metal structural component pre-embedded or fixed to the ground or equipment platform, and its top is provided with a positioning boss 15 of a specific geometric shape, which cooperates with the positioning self-locking mechanism 3 to achieve mechanical self-locking.

[0018] like Figure 2 and Figure 3 As shown, the positioning self-locking mechanism 3 includes a slider 5, a bidirectional wedge locking assembly, and an elastic reset unit. The slider 5 is a metal block that is integrally cast or machined, and its top surface is fixed to the central area of ​​the bottom surface of the pump body 1 by welding, bolting, or integral molding. A through guide groove 14 is provided at the bottom end of the slider 5 along the front-back direction. The inner walls of the left and right sides of the guide groove 14 are respectively provided with guide grooves for cooperating with the sliding guide rail in the bidirectional wedge locking assembly. The bidirectional wedge locking assembly consists of a first wedge 6 and a second wedge 7, which are arranged symmetrically on the left and right sides and respectively embedded on the left and right sides of the guide groove 14. The opposite sides of the first wedge 6 and the second wedge 7 are machined with wedge-shaped inclined surfaces with an inclination angle of 15° to 25°. The two wedge-shaped inclined surfaces fit together to form a V-shaped clamping structure. The opening of the V-shaped clamping structure faces downward and is used to accommodate and clamp the positioning boss 15 on the top of the mounting base 4.

[0019] like Figure 4 As shown, a rectangular positioning boss 15 protruding upwards is provided at the center of the top surface of the mounting base 4. The top two edges of the positioning boss 15 are respectively machined with chamfered bevels, the angle of which matches the wedge-shaped bevels of the first wedge 6 and the second wedge 7. When the pump body 1 is installed downwards onto the mounting base 4, the positioning boss 15 is inserted into the V-shaped clamping structure from bottom to top. Its chamfered bevels contact the wedge-shaped bevels of the first wedge 6 and the second wedge 7, and during the continued downward pressing, it forces the first wedge 6 and the second wedge 7 to slide outwards along the guide groove 14. At this time, the outer surfaces of the first wedge 6 and the second wedge 7 are respectively provided with sliding guide rails. These sliding guide rails are embedded in the corresponding guide grooves on the left and right inner walls of the guide groove 14, so that the first wedge 6 and the second wedge 7 can only move in the horizontal direction and cannot undergo vertical displacement or rotation, thereby ensuring the smoothness and centering of the sliding process.

[0020] like Figure 3As shown, the elastic reset unit is located inside the slider 5, between the first wedge 6 and the second wedge 7. This elastic reset unit includes a compression spring 8 and a guide post 9. The guide post 9 is a cylindrical metal rod, its lower end of which is vertically fixed to the center of the inner bottom surface of the slider 5. It can be fixed by threaded connection, interference fit, or welding. The compression spring 8 is sleeved on the outer periphery of the guide post 9, its lower end abutting against the inner bottom surface of the slider 5, and its upper end abutting against the bottom surface of the linkage pressure plate 10. The linkage pressure plate 10 is a horizontally arranged metal plate, its left and right ends being fixedly connected to the inner surfaces of the first wedge 6 and the second wedge 7 respectively by welding, bolts, or pins, so that the first wedge 6, the second wedge 7, and the linkage pressure plate 10 form an integral sliding unit. The linkage pressure plate 10 has a central hole in the center, which is clearance-fitted with the guide post 9. The diameter of the central hole is 0.3mm to 0.8mm larger than the outer diameter of the guide post 9, so as to allow the linkage pressure plate 10 to move smoothly up and down along the axis of the guide post 9 when under force, while avoiding jamming or deflection due to manufacturing errors or assembly deviations.

[0021] With the pump body 1 not installed on the mounting base 4, the compression spring 8 is in its naturally extended state. Its elastic force pushes the linkage pressure plate 10 upward, thereby causing the first wedge 6 and the second wedge 7 to move closer together, so that the V-shaped clamping structure is in a closed state, that is, the two wedge-shaped inclined surfaces are tightly fitted. When the pump body 1 is installed downward, the positioning boss 15 enters the V-shaped clamping structure. Its chamfered inclined surface contacts the wedge-shaped inclined surface and generates a horizontal component force. This component force overcomes the elastic force of the compression spring 8, pushing the first wedge 6 and the second wedge 7 to slide outward along the guide groove 14, and the compression spring 8 is further compressed. When the positioning boss 15 is fully embedded in the V-shaped clamping structure, its top contacts the inner bottom surface of the slider 5, at which point the downward pressure stops. Under the reaction force of the compression spring 8, the first wedge 6 and the second wedge 7 move inward back, and their wedge-shaped inclined surfaces re-fit the chamfered inclined surface of the positioning boss 15, applying a continuous clamping force, thereby locking the pump body 1 on the mounting base 4, forming a mechanical self-locking mechanism.

[0022] like Figure 2 and Figure 5 As shown, the slider 5 has limiting through holes 13 extending through its thickness on both its left and right sides. The axis of the limiting through holes 13 is parallel to the sliding direction of the guide groove 14. The adjusting screw 11 passes through the limiting through holes 13, and its inner end is threaded to the outer side of the first wedge 6 or the second wedge 7. Its outer end extends to the outside of the slider 5 and is fixedly connected to a knob 12. The knob 12 can be hexagonal, butterfly-shaped, or circular with anti-slip texture for easy manual rotation. When the knob 12 is rotated, the adjusting screw 11 moves axially along the limiting through holes 13, thereby pushing or pulling back the corresponding wedge to adjust its initial position. This structure can be used to compensate for changes in the fit clearance caused by manufacturing tolerances, thermal expansion, or long-term use, ensuring that the V-shaped clamping structure can always effectively clamp the positioning boss 15.

[0023] An annular groove is provided on the inner wall of the limiting through hole 13, and a sealing ring 17 is embedded in the annular groove, surrounding the outer circumference of the adjusting screw 11. The sealing ring 17 is made of rubber, silicone or fluororubber, and its inner diameter is slightly smaller than the outer diameter of the adjusting screw 11 to form an interference fit, preventing external dust, coolant or other impurities from entering the slider 5 through the limiting through hole 13, affecting the sliding performance of the first wedge 6 and the second wedge 7 and the working state of the compression spring 8.

[0024] like Figure 1 and Figure 2 As shown, rubber buffer pads 16 are provided at the four corners of the bottom surface of the slider 5. The rubber buffer pads 16 are elastic bodies with rectangular or circular cross-sections, and their upper surfaces are fixedly connected to the bottom surface of the slider 5 by countersunk screws. The heads of the countersunk screws are embedded inside the rubber buffer pads 16, making their surfaces flat and avoiding stress concentration caused by direct contact with the mounting base 4. During the operation of the pump body 1, the rubber buffer pads 16 are located between the slider 5 and the mounting base 4 to absorb the high-frequency vibrations generated during the operation of the pump body 1, reduce rigid contact between metal parts, and reduce noise transmission.

[0025] During assembly of the entire positioning self-locking mechanism 3, the guide post 9 is first fixed to the center of the inner bottom surface of the slider 5; then, the compression spring 8 is fitted into the guide post 9; next, the linkage pressure plate 10 is passed through the guide post 9, and its left and right ends are respectively fixedly connected to the first wedge 6 and the second wedge 7; then, the sliding guide rails of the first wedge 6 and the second wedge 7 are respectively embedded into the guide grooves on the left and right inner walls of the guide groove 14; then, the adjusting screw 11 is inserted from the outside of the slider 5 into the limiting through hole 13, and screwed into the threaded hole of the first wedge 6 or the second wedge 7; finally, the sealing ring 17 is installed in the annular groove on the inner wall of the limiting through hole 13, and the knob 12 is fixed to the outer end of the adjusting screw 11. After completing the above steps, the slider 5 is fixed to the bottom surface of the pump body 1, and rubber buffer pads 16 are installed at the four corners of the bottom surface.

[0026] During actual installation, the mounting base 4 is first fixed in the predetermined position, ensuring its top surface is level and the positioning boss 15 is free from deformation or damage. Then, the pump body 1, along with the positioning self-locking mechanism 3, is hoisted onto the mounting base 4 and slowly lowered after aligning with the positioning boss 15. As the pump body 1 descends, the positioning boss 15 gradually inserts into the V-shaped clamping structure, pushing the first wedge 6 and the second wedge 7 outwards, compressing the compression spring 8. Once the pump body 1 is fully in place, the spring force of the compression spring 8 causes the first wedge 6 and the second wedge 7 to clamp the positioning boss 15 inwards, achieving self-locking. If insufficient clamping force or gaps are found, the knobs 12 on the left and right sides can be rotated respectively to fine-tune the position of the adjusting screw 11, allowing the first wedge 6 and the second wedge 7 to move further inwards, enhancing the clamping effect.

[0027] During disassembly, rotate knob 12 in the opposite direction to pull the adjusting screw 11 outward, causing the first wedge 6 and the second wedge 7 to widen the opening of the V-shaped clamping structure, releasing the clamp on the positioning boss 15. Then, the pump body 1 can be lifted upward as a whole and detached from the mounting base 4. The entire process requires no additional tools or external energy; installation and disassembly can be completed solely using the mechanical structure.

[0028] The connections, positions, and fits between the aforementioned components are achieved through precision machining and standard fasteners, ensuring structural stability and self-locking reliability under conditions such as long-term operation, frequent start-stop, or changes in ambient temperature. All moving parts employ metal-to-metal sliding fits, and the degrees of freedom are limited by the guide groove 14 and the sliding guide rail, preventing unintended displacement. The elastic reset unit provides continuous reset force through the compression spring 8, the linkage pressure plate 10 ensures synchronous movement of the two wedges, and the guide column 9 ensures the linearity of the movement trajectory. The fit between the adjusting screw 11 and the limiting through hole 13 allows for precise adjustment of the initial position, the sealing ring 17 ensures internal cleanliness, and the rubber buffer gasket 16 isolates vibration transmission. Together, these structures constitute a fully mechanical, electronic-free, highly reliable positioning and self-locking system, suitable for the long-term stable operation requirements of central air conditioning circulating pumps in various industrial and civil buildings.

[0029] To enable those skilled in the art to fully understand and implement this invention, the specific implementation principle of this invention is further explained below in conjunction with a typical application scenario.

[0030] In the central air conditioning room of a large commercial complex, a circulating pump with a rated cooling capacity of 800kW needs to be quickly installed and ensured to operate stably for a long time. The circulating pump consists of a pump body 1, a drive motor 2, and a positioning self-locking mechanism 3 located at the bottom of the pump body 1, with a mounting base 4 pre-embedded in the concrete foundation below it. Before installation, the mounting base 4 is first firmly fixed to the floor of the machine room with anchor bolts, and its top surface is calibrated with a level to ensure that the positioning boss 15 is not deformed and that the top chamfered bevel is intact. Then, the assembled circulating pump is hoisted as a whole to the top of the mounting base 4, so that the V-shaped clamping structure at the bottom of the slider 5 is aligned with the positioning boss 15.

[0031] When pump body 1 is slowly lowered, such as Figure 4 As shown, the positioning boss 15 on the mounting base 4 is inserted from bottom to top into the V-shaped clamping structure formed by the first wedge 6 and the second wedge 7. Since the chamfered bevels on both sides of the top of the positioning boss 15 match the wedge-shaped bevels of the first wedge 6 and the second wedge 7 at an angle (preferably 20°), a contact force is generated along the normal direction of the wedge surface after they come into contact. This force can be decomposed into a vertical component and a horizontal component; the horizontal component pushes the first wedge 6 and the second wedge 7 to slide outwards along the guide groove 14. Figure 3As shown, the sliding guide rails provided on the outer sides of the first wedge 6 and the second wedge 7 are embedded in the guide grooves on the left and right inner walls of the guide groove 14, allowing them to move only in the horizontal direction, thereby restricting the degree of freedom of the wedge in the vertical or rotational direction and ensuring the accuracy of the motion trajectory.

[0032] As the pump body 1 continues to descend, the positioning boss 15 is fully embedded in the V-shaped clamping structure, and its top surface contacts the inner bottom surface of the slider 5, at which point the downward pressing action stops. During this process, the linkage pressure plate 10 moves outward synchronously with the first wedge 6 and the second wedge 7, compressing the compression spring 8 sleeved on the outer periphery of the guide post 9. When the external force is removed, the elastic restoring force generated by the compression spring 8 is transmitted to the first wedge 6 and the second wedge 7 through the linkage pressure plate 10, causing them to move inward, and the wedge-shaped inclined surface re-fits the chamfered inclined surface of the positioning boss 15, applying a continuous radial clamping force. This clamping force is converted into an axial constraint force on the positioning boss 15 through the self-locking effect of the wedge-shaped inclined surface, thereby firmly locking the pump body 1 onto the mounting base 4, forming a purely mechanical self-locking state without the need for external energy intervention.

[0033] If the clamping force weakens due to manufacturing tolerances or long-term operation, the operator can manually rotate the knobs 12 on both sides of the slider 5. Figure 5 As shown, knob 12 drives adjusting screw 11 to move axially along limiting through hole 13. Since the inner end of adjusting screw 11 is threadedly connected to the outer side of the first wedge 6 or the second wedge 7, its axial displacement is directly converted into a pushing and pulling action on the corresponding wedge, thereby finely adjusting the initial opening size of the V-shaped clamping structure. This adjustment mechanism can compensate for the fitting clearance without disassembling pump body 1, ensuring self-locking reliability. At the same time, the sealing ring 17 embedded in the annular groove on the inner wall of limiting through hole 13 tightly covers the outer periphery of adjusting screw 11, effectively preventing impurities such as cooling water mist and dust from entering the slider 5, and avoiding corrosion of compression spring 8 or obstruction of wedge sliding.

[0034] After pump body 1 is put into operation, drive motor 2 drives impeller to rotate at high speed, causing pump body 1 to vibrate periodically. At this time, as... Figure 1 and Figure 2 As shown, the rubber buffer pads 16 located at the four corners of the bottom surface of the slider 5 are situated between the slider 5 and the mounting base 4. Their high-damping elastic characteristics absorb high-frequency vibration energy, preventing resonance amplification and structural fatigue caused by rigid metal-to-metal contact. Countersunk screws securely connect the rubber buffer pads 16 to the bottom surface of the slider 5, with the screw heads embedded inside the pads to avoid localized stress concentration that could lead to rubber tearing.

[0035] When the circulating pump needs to be disassembled during subsequent maintenance, the operator rotates the knobs 12 on both sides in the opposite direction, causing the adjusting screw 11 to pull the first wedge 6 and the second wedge 7 outward, widening the opening of the V-shaped clamping structure and releasing the clamping constraint on the positioning boss 15. At this time, the pump body 1 can be lifted vertically as a whole and detached from the mounting base 4. The entire process does not require hydraulic jacks, pry bars or other auxiliary tools, significantly improving maintenance efficiency.

[0036] The above implementation process shows that the present invention achieves automatic centering, locking upon positioning, and self-holding after locking during installation through the synergistic action of the slider 5, the bidirectional wedge locking assembly (first wedge 6, second wedge 7), the elastic reset unit (compression spring 8, guide post 9, linkage pressure plate 10), and the positioning boss 15 on the mounting base 4; the locking force is adjustable through the cooperation of the adjusting screw 11 and the knob 12; the internal moving parts are kept clean through the sealing ring 17; and vibration transmission is isolated through the rubber buffer pad 16. The geometric fit, motion constraints, and force transmission paths between the components are all achieved through precision machining, ensuring that high positioning accuracy and strong self-locking performance are maintained even under frequent start-stop, temperature changes, or long-term load conditions, effectively overcoming the problems of displacement, increased vibration, and energy efficiency degradation caused by structural loosening in the prior art.

[0037] All contents not described in detail in the specification are existing technologies known to those skilled in the art, and the materials, heat treatment processes and tolerance grades of each component are not specifically limited and conventional engineering standards can be used. Auxiliary installation or testing components not mentioned in this technical solution are not shown in the figure because they are conventional methods, and will not be described in detail here.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A self-locking, positionable central air conditioning circulating pump, characterized in that, The pump body (1), drive motor (2), and positioning self-locking mechanism (3) are included. The positioning self-locking mechanism (3) is located at the bottom of the pump body (1) and is used in conjunction with the mounting base (4). The positioning self-locking mechanism (3) includes a slider (5), a bidirectional wedge locking assembly, and an elastic reset unit. The slider (5) is fixedly connected to the bottom surface of the pump body (1). The bidirectional wedge locking assembly is embedded inside the slider (5). The elastic reset unit is located between the slider (5) and the bidirectional wedge locking assembly. The bottom end of the slider (5) has a through-hole. The guide grooves (14) on the front and rear sides, the bidirectional wedge locking assembly includes a first wedge (6) and a second wedge (7) symmetrically arranged. The first wedge (6) and the second wedge (7) are slidably fitted on the inner walls of the left and right sides of the guide groove (14). The opposite sides of the first wedge (6) and the second wedge (7) are provided with wedge-shaped inclined surfaces with an inclination angle of 15° to 25°. The two wedge-shaped inclined surfaces are attached to each other and form a V-shaped clamping structure. The V-shaped clamping structure is used to clamp the positioning boss (15) preset on the mounting base (4).

2. A self-locking, positionable central air conditioning circulating pump according to claim 1, characterized in that, The slider (5) is provided with limiting through holes (13) on the left and right sides respectively, and adjusting screws (11) are inserted in the limiting through holes (13). One end of the adjusting screw (11) is connected to the outer side of the corresponding wedge by a thread, and the other end extends to the outside of the slider (5) and is fixedly connected to a knob (12).

3. A self-locking, positionable central air conditioning circulating pump according to claim 1, characterized in that, The elastic reset unit includes a compression spring (8) and a guide post (9). The guide post (9) is vertically fixed at the center of the inner bottom surface of the slider (5). The compression spring (8) is sleeved on the outer periphery of the guide post (9). One end of the spring abuts against the inner bottom surface of the slider (5), and the other end abuts against the linkage pressure plate (10) located between the first wedge (6) and the second wedge (7). The left and right ends of the linkage pressure plate (10) are fixedly connected to the inner surfaces of the first wedge (6) and the second wedge (7), respectively.

4. A self-locking, positionable central air conditioning circulating pump according to claim 1, characterized in that, The mounting base (4) has a rectangular positioning boss (15) that protrudes upward in the center of its top surface. The top two sides of the positioning boss (15) are machined with chamfered bevels that match the wedge-shaped bevels of the first wedge (6) and the second wedge (7).

5. A self-locking, positionable central air conditioning circulating pump according to claim 1, characterized in that, Rubber buffer pads (16) are provided at the four corners of the bottom surface of the slider (5), and the rubber buffer pads (16) are fixedly connected to the slider (5) by countersunk screws.

6. A self-locking, positionable central air conditioning circulating pump according to claim 1, characterized in that, The outer surfaces of the first wedge (6) and the second wedge (7) are respectively provided with sliding guide rails. The left and right inner walls of the guide groove (14) are provided with guide grooves that cooperate with the sliding guide rails. The sliding guide rails are embedded in the guide grooves and slide along their length direction.

7. A self-locking, positionable central air conditioning circulating pump according to claim 3, characterized in that, The linkage pressure plate (10) has a central hole that fits with the guide post (9) with a clearance. The diameter of the central hole is 0.3 mm to 0.8 mm larger than the outer diameter of the guide post (9).

8. A self-locking, positionable central air conditioning circulating pump according to claim 2, characterized in that, A sealing ring (17) is provided between the adjusting screw (11) and the limiting through hole (13), and the sealing ring (17) is embedded in the annular groove on the inner wall of the limiting through hole (13).

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