Permanent magnet variable frequency booster pump

Abstract

The utility model provides a kind of permanent magnet variable frequency booster pump, belong to the pump field.It solves the problem of water seepage and pressure leakage caused by pressure of existing booster pump.The permanent magnet variable frequency booster pump, including the pump body with water outlet pipe, the water outlet pipe of pump body is connected with connecting pipe, and the connecting sealing mechanism is equipped at the connecting place of water outlet pipe and connecting pipe, the end of connecting pipe is equipped with external thread, the connecting sealing mechanism includes connecting cylinder, bushing, rubber sealing element, press sleeve and adjusting sleeve, the inner wall of water outlet pipe end is equipped with internal thread, both are threadedly connected, and with the inner wall of connecting cylinder is enclosed into sealing ring cavity, the inner and outer wall of rubber sealing element is equipped with multiple sealing rings, top end is opened V-shaped groove, the lower end of press sleeve is equipped with inclined flange, adjusting sleeve is inserted into sealing ring cavity, and its end is equipped with convex ring, inner wall is equipped with cooperation part, the outer portion of bushing front end is equipped with inclined flange, the outer wall of adjusting sleeve is equipped with multiple connecting ears one, the end of connecting cylinder is equipped with multiple connecting ears two.The utility model has the advantage of high sealing connection.

Description

Technical Field

[0001] This utility model belongs to the field of pumps, and relates to a booster pump, and more particularly to a permanent magnet variable frequency booster pump. Background Technology

[0002] A booster pump is a common type of pump used to increase water pressure. Its working principle is as follows: the booster pump generates a low-pressure zone through the rotation of the impeller, drawing in water from the water source; when the impeller rotates, it converts electrical energy into the kinetic energy of the water. The water accelerates under the action of the impeller. As the water moves from the center of the impeller to the edge, the speed gradually slows down, and the kinetic energy is converted into pressure energy, resulting in an increase in water pressure. The pump casing or guide casing of the booster pump guides the high-speed water flow thrown out by the impeller to the outlet, forming a stable water flow.

[0003] Because of the high internal pressure of the booster pump, the connection between its outlet and the outlet pipe joint is prone to loosening, which can easily lead to water leakage at the connection point. This results in significant hydraulic loss, affecting the pump's water volume and efficiency. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by providing a permanent magnet variable frequency booster pump to solve these problems.

[0005] The purpose of this utility model can be achieved through the following technical solution: A permanent magnet variable frequency booster pump includes a pump body with a water outlet pipe, a connecting pipe is connected to the water outlet pipe of the pump body, a connection sealing mechanism is provided at the connection between the water outlet pipe and the connecting pipe, and the end of the connecting pipe is provided with an external thread;

[0006] The connection sealing mechanism includes a connecting cylinder fixedly disposed at the end of the water outlet pipe, a bushing sleeved outside the connecting pipe, a rubber seal for improving the sealing strength, a pressure sleeve located above the rubber seal, and an adjusting sleeve for adjusting the sealing strength of the pressure sleeve.

[0007] The inner wall of the outlet pipe end is provided with an internal thread that is compatible with the external thread of the connecting pipe. The two are threadedly connected and form a sealing ring cavity with the inner wall of the connecting cylinder.

[0008] The rubber seal is located at the bottom of the sealing ring cavity, and multiple sealing rings are provided on both its inner and outer walls, with a V-groove at the top.

[0009] The lower end of the pressure sleeve is provided with an inclined flange that is pressed into the V-groove;

[0010] The adjusting sleeve is inserted into the sealing ring cavity, and its end is provided with a convex ring adapted to the ring cavity. The inner wall is provided with a mating part with an inclined structure.

[0011] The bushing has an inclined folded edge on the front end that is inclined and press-fitted with the mating part;

[0012] The outer wall of the adjusting sleeve is provided with multiple connecting lugs 1, and the outer wall of the end of the connecting cylinder is provided with multiple connecting lugs 2. The two are fastened by bolts and nuts passing through connecting lugs 1 and 2. By tightening the nuts, the distance between the connecting lugs is shortened, driving the adjusting sleeve to press down the inclined flange of the bushing, so that the inclined flange of the pressure sleeve squeezes the V-groove of the rubber seal, causing the rubber seal to expand radially and form a multi-layer seal.

[0013] In the aforementioned permanent magnet variable frequency booster pump, the V-groove opening of the rubber seal faces the pressure sleeve, and the sealing rings on its inner and outer walls respectively fit against the inner wall of the connecting cylinder and the outer wall of the connecting pipe.

[0014] In the aforementioned permanent magnet variable frequency booster pump, the inclined flange section of the pressure sleeve is tapered, and its inclination angle matches the sidewall of the V-groove.

[0015] In the aforementioned permanent magnet variable frequency booster pump, the bushing end is provided with a limiting part, and the connecting pipe is provided with an annular groove at the corresponding position. The limiting part is inserted into the annular groove to restrict the axial displacement of the bushing.

[0016] In the aforementioned permanent magnet variable frequency booster pump, the axial length of the convex ring of the adjusting sleeve is equal to the depth of the sealing ring cavity, and it abuts against the bottom surface of the ring cavity when pressed down.

[0017] In the aforementioned permanent magnet variable frequency booster pump, the bolt rod and nut form an adjustable bolt-nut structure, and the compression of the rubber seal is controlled by the degree of tightening.

[0018] Compared with existing technologies, this permanent magnet variable frequency booster pump achieves externally adjustable and continuous compensation of sealing force through the mechanical linkage of bolt-driven adjusting sleeve, inclined extrusion bushing, pushing pressure sleeve and wedge-pressed rubber seal. Combined with multiple sealing mechanisms, it provides a highly reliable, long-life and easy-to-maintain pipeline connection sealing solution for key components such as permanent magnet variable frequency booster pumps that face pressure fluctuations and vibrations. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of a permanent magnet variable frequency booster pump.

[0020] Figure 2 This is a partial enlarged cross-sectional view of the connection between the water outlet pipe and the connecting pipe.

[0021] In the diagram, 1. Pump body; 2. Outlet pipe; 3. Connecting pipe; 4. Connecting sleeve; 5. Bushing; 6. Rubber seal; 7. Pressure sleeve; 8. Adjusting sleeve; 9. Sealing ring; 10. V-groove; 11. Raised ring; 12. Mating part; 13. Inclined flange; 14. Connecting lug 1; 15. Connecting lug 2; 16. Bolt rod; 17. Nut; 18. Inclined flange; 19. Limiting part; 20. Ring groove. Detailed Implementation

[0022] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0023] like Figure 1 , Figure 2 As shown, this permanent magnet variable frequency booster pump includes a pump body 1 with a water outlet pipe 2. A connecting pipe 3 is connected to the water outlet pipe 2 of the pump body 1. A connecting sealing mechanism is provided at the connection between the water outlet pipe 2 and the connecting pipe 3. The end of the connecting pipe 3 has an external thread. The connecting sealing mechanism includes a connecting cylinder 4 fixed to the end of the water outlet pipe 2, a bushing 5 sleeved outside the connecting pipe 3, a rubber seal 6 for improving sealing strength, a pressure sleeve 7 located above the rubber seal 6, and an adjusting sleeve 8 for adjusting the sealing strength of the pressure sleeve 7. The inner wall of the end of the water outlet pipe 2 has an internal thread adapted to the external thread of the connecting pipe 3. The two are threadedly connected and form a sealing ring cavity with the inner wall of the connecting cylinder 4. The rubber seal 6 is located at the bottom of the sealing ring cavity, and multiple sealing rings 9 are provided on both its inner and outer walls. A V-groove is opened at the top. 10. The lower end of the pressure sleeve 7 is provided with an inclined flange 18 that is pressed and fitted with the V-groove 10. The adjusting sleeve 8 is inserted into the sealing ring cavity. Its end is provided with a convex ring 11 that is adapted to the ring cavity. The inner wall is provided with a mating part 12 with an inclined structure. The front end of the bushing 5 is provided with an inclined folded edge 13 that is pressed and fitted with the mating part 12. The outer wall of the adjusting sleeve 8 is provided with multiple connecting ears 14. The outer wall of the end of the connecting cylinder 4 is provided with multiple connecting ears 25. The two are fastened by bolts 16 and nuts 17 that pass through the connecting ears 14 and connecting ears 25. By tightening the nuts 17, the distance between the connecting ears is shortened, and the adjusting sleeve 8 is driven to press down the inclined folded edge 13 of the bushing 5, so that the inclined flange 18 of the pressure sleeve 7 presses the V-groove 10 of the rubber seal 6, causing the rubber seal 6 to expand radially and form a multi-layer seal.

[0024] Through the mechanical linkage of bolt-driven adjusting sleeve 8, inclined extrusion bushing 5, pushing pressure sleeve 7 and wedge-pressed rubber seal 6, the externally adjustable and continuously compensated sealing force is realized. Combined with multiple sealing mechanisms, a highly reliable, long-life and easy-to-maintain pipeline connection sealing solution is provided for key components such as permanent magnet variable frequency booster pumps that face pressure fluctuations and vibrations.

[0025] The V-groove 10 of the rubber seal 6 opens towards the pressure sleeve 7, and the sealing rings 9 on its inner and outer walls respectively fit against the inner wall of the connecting cylinder 4 and the outer wall of the connecting pipe 3. The inclined flange 18 of the pressure sleeve 7 has a tapered cross-section, and its inclination angle matches the side wall of the V-groove 10. The end of the bushing 5 is provided with a limiting part 19, and the corresponding position of the connecting pipe 3 is provided with an annular groove 20. The limiting part 19 is engaged with the annular groove 20 to restrict the axial displacement of the bushing 5. The axial length of the convex ring 11 of the adjusting sleeve 8 is equal to the depth of the sealing ring cavity, and it abuts against the bottom surface of the annular cavity when pressed down. The bolt rod 16 and the nut 17 form a bolt and nut 17 structure that can be tightened and adjusted, and the compression of the rubber seal 6 is controlled by the degree of tightening.

[0026] First, screw the externally threaded connecting pipe 3 into the internal thread at the end of the outlet pipe 2 of the pump body 1. This provides a basic mechanical connection and a preliminary thread seal. After the connecting pipe 3 is inserted, its outer side, the inner wall of the end of the outlet pipe 2 (the root of the thread), and the inner wall of the connecting cylinder 4 fixedly installed at the end of the outlet pipe 2 together form an annular space, namely the "sealing annular cavity".

[0027] It is placed at the bottom of the sealing ring cavity. Multiple sealing rings 9 on its inner and outer walls are pre-attached to the inner wall of the connecting cylinder 4 and the outer wall of the connecting pipe 3, respectively, providing an initial static seal, and are placed above the rubber seal 6. Its lower end has a tapered, inclined flange 18 that inserts precisely into the V-groove 10 at the top of the rubber seal 6. It is fitted over the outside of the connecting pipe 3, with an inclined folded edge 13 at its front end. The limiting portion 19 at the end of the bushing 5 engages with the annular groove 20 on the connecting pipe 3 to prevent axial movement of the bushing 5. It is inserted into the sealing ring cavity, with the protruding ring 11 at its end matching the axial depth of the sealing ring cavity. The inner wall of the adjusting sleeve 8 has an inclined mating portion 12.

[0028] By tightening the nut 17 on the bolt rod 16 that passes through the connecting ear 14 on the outer wall of the adjusting sleeve 8 and the connecting ear 15 at the end of the connecting cylinder 4, the distance between the two sets of connecting ears is shortened. This forces the adjusting sleeve 8 to move axially downward. As the adjusting sleeve 8 moves downward, the inclined mating part 12 on its inner wall will press against the inclined flange 13 on the outer front end of the bushing 5. Since the bushing 5 is limited (axially fixed) by the annular groove 20 on the connecting pipe 3, the pressing action of the inclined mating part 12 of the adjusting sleeve 8 on the inclined flange 13 of the bushing 5 will generate a radially inward component force (wedge principle), forcing the bushing 5 to produce a slight radial contraction deformation. The radial contraction of the bushing 5 will push the pressure sleeve 7 downward.

[0029] The downward-moving pressure sleeve 7, with its tapered inclined flange 18, forcefully weds into the V-groove 10 of the rubber seal 6. The two side walls of the V-groove 10 are forcibly opened, forcing the inner and outer walls of the rubber seal 6 to press more tightly against the outer wall of the connecting pipe 3 and the inner wall of the connecting cylinder 4, respectively. This results in a stronger radial sealing force from the multiple sealing rings 9 on the inner and outer walls. The downward pressure of the pressure sleeve 7 also directly compresses the rubber seal 6 axially, enhancing its overall density. By precisely controlling the tightening of the nut 17, the depth of the downward pressure of the pressure sleeve 7 can be precisely adjusted, thereby controlling the degree of radial expansion and axial compression of the rubber seal 6. Ultimately, a tightly fitted multi-layered dynamic sealing barrier, composed of a strongly compressed rubber body and multiple layers of inner and outer sealing rings 9, is formed between the outer wall of the connecting pipe 3 and the inner wall of the connecting cylinder 4. The convex ring 11 at the end of the adjusting sleeve 8 eventually abuts against the bottom surface of the sealing ring cavity, providing support.

[0030] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0031] Although this document uses a considerable amount of technical terms, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this invention; interpreting them as any additional limitation would contradict the spirit of this invention.

Claims

1. A permanent magnet variable frequency booster pump comprising a pump body (1) with a water outlet pipe (2), an external connecting pipe (3) is connected to the water outlet pipe (2) of the pump body (1), characterized in that, The connection between the water outlet pipe (2) and the connecting pipe (3) is provided with a connection sealing mechanism, and the end of the connecting pipe (3) is provided with an external thread; The connection sealing mechanism includes a connecting cylinder (4) fixed at the end of the water outlet pipe (2), a bushing (5) sleeved outside the connecting pipe (3), a rubber seal (6) for improving the sealing strength, a pressure sleeve (7) located above the rubber seal (6), and an adjusting sleeve (8) for adjusting the sealing strength of the pressure sleeve (7). The inner wall of the end of the water outlet pipe (2) is provided with an internal thread that is compatible with the external thread of the connecting pipe (3). The two are threadedly connected and form a sealing ring cavity with the inner wall of the connecting cylinder (4). The rubber seal (6) is located at the bottom of the sealing ring cavity, and multiple sealing rings (9) are provided on its inner and outer walls, and a V-groove (10) is opened at the top. The lower end of the pressure sleeve (7) is provided with an inclined flange (18) that is pressed into the V-groove (10). The adjusting sleeve (8) is inserted into the sealing ring cavity, and its end is provided with a convex ring (11) that is adapted to the ring cavity. The inner wall is provided with a mating part (12) with an inclined structure. The bushing (5) has an inclined flange (13) on the front end outside that is inclinedly pressed to fit the mating part (12). The outer wall of the adjusting sleeve (8) is provided with multiple connecting ears 1 (14), and the outer wall of the end of the connecting cylinder (4) is provided with multiple connecting ears 2 (15). The two are fastened by bolt rods (16) and nuts (17) that pass through connecting ears 1 (14) and connecting ears 2 (15). By tightening the nuts (17), the distance between the connecting ears is shortened, and the adjusting sleeve (8) is driven to press down the inclined flange (13) of the bushing (5), so that the inclined flange (18) of the pressure sleeve (7) squeezes the V-groove (10) of the rubber seal (6), so that the rubber seal (6) expands radially to form a multi-layer seal.

2. A permanent magnet variable frequency booster pump according to claim 1, characterized in that, The V-groove (10) of the rubber seal (6) opens toward the pressure sleeve (7), and the sealing rings (9) on its inner and outer walls are respectively attached to the inner wall of the connecting cylinder (4) and the outer wall of the connecting pipe (3).

3. A permanent magnet variable frequency booster pump according to claim 1, characterized in that, The inclined flange (18) of the pressure sleeve (7) has a tapered cross section, and its inclination angle matches the side wall of the V-groove (10).

4. A permanent magnet variable frequency booster pump according to claim 1, characterized in that, The bushing (5) has a limiting part (19) at its end, and the connecting pipe (3) has an annular groove (20) at the corresponding position. The limiting part (19) is inserted into the annular groove (20) to limit the axial displacement of the bushing (5).

5. A permanent magnet variable frequency booster pump according to claim 1, characterized in that, The axial length of the convex ring (11) of the adjusting sleeve (8) is equal to the depth of the sealing ring cavity, and it abuts against the bottom surface of the ring cavity when pressed down.

6. A permanent magnet variable frequency booster pump according to claim 1, characterized in that, The bolt rod (16) and nut (17) form a bolt and nut (17) structure that can be tightened and adjusted, and the compression of the rubber seal (6) is controlled by the degree of tightening.

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