Pump head of magnetic drive pump

Abstract

The invention discloses a magnetic drive pump head which comprises a pump shell with an inner cavity, a drive shaft and an impeller, the impeller comprises a wheel disc, a plurality of blades arranged on one side face of the wheel disc and blade grooves formed between the adjacent blades, and crushing teeth are arranged on the side, right corresponding to the blades, of the inner cavity. An ejection assembly is arranged on the impeller and has ejection characteristics distributed in each blade groove, a movable structure is arranged between the ejection assembly and the impeller, and the ejection assembly moves towards the crushing teeth and has a matching position matched with the crushing teeth and a hiding position retracting into the blade grooves. And the ejection assembly is connected with a control mechanism for controlling the ejection assembly to be switched between the matching position and the hiding position. The pump head has the following advantages and effects that the phenomenon of impeller winding can be reduced on the premise that large flow is guaranteed, so that the working efficiency of the pump head is guaranteed, and the pump head has better universality and practicability.

Description

Technical Field

[0001] The invention relates to a magnetic drive pump, in particular to a magnetic drive pump head. Background Art

[0002] The magnetic drive pump is a new type of sealless pump that uses the principle of permanent magnetic transmission technology to achieve contactless transmission of torque. There is no mechanical connection between the driving shaft and the driven shaft, and no dynamic seal is required in the structure, so this type of pump can achieve zero leakage and can be used in working conditions where mechanical seals are difficult to handle. Due to the special advantages of magnetic drive pumps, they can be widely used in various fields.

[0003] The principle of fluid transmission by the pump mainly depends on the blade structure on the impeller. The fluid enters the blade groove between adjacent blades, and is thrown outward under the action of the centrifugal force of the impeller to achieve the transmission of the fluid medium. However, in some complex working conditions, there will be a lot of debris in the fluid medium, and these debris are very easy to entangle with the impeller and affect the normal rotation of the impeller.

[0004] In order to solve this entanglement phenomenon, those skilled in the art will set crushing teeth between the impeller and the pump casing to crush the entangled debris; and refer to the announcement number: CN207614926U, which discloses a crushing pump. This setting structure needs to shorten the width of the blades to the greatest extent to ensure that the debris will not be entangled in the blades and the crushing teeth, so that the debris can contact the crushing teeth for bite and crushing. Due to the reduction in the width of the blades, the depth of the blade groove is also reduced accordingly, thereby reducing the flow rate of the fluid through the blade groove and reducing the working efficiency of the pump body. As a result, it cannot be applied to some high-efficiency large-scale working conditions, which greatly reduces the practicality of the pump head. Summary of the invention

[0005] The purpose of the present invention is to provide a magnetic drive pump head, which can reduce the occurrence of impeller winding under the premise of ensuring a large flow rate, thereby ensuring the working efficiency of the pump head and making it more universal and practical.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: a magnetic drive pump head, comprising a pump casing with an inner cavity, a drive shaft arranged in the pump casing, and an impeller installed in the inner cavity and connected to the drive shaft, the impeller comprising a wheel disc, a plurality of blades arranged on one side of the wheel disc and distributed around and at intervals, and a blade groove formed between adjacent blades, a crushing tooth is provided on the side of the inner cavity corresponding to the blade, an ejection assembly is provided on the impeller, and the ejection assembly has an ejection feature distributed in each blade groove, an active structure is provided between the ejection assembly and the impeller for the ejection assembly to rotate with the impeller and reciprocate toward one side of the crushing tooth, the ejection assembly has a matching position for matching the crushing tooth and a hiding position for retracting into the blade groove when moving toward the crushing tooth, and a control mechanism for controlling the ejection assembly to switch between the matching position and the hiding position is connected to the ejection assembly.

[0007] By adopting the above technical solution, the ejector assembly rotates with the impeller under the action of the movable structure, and can move along the axis of the drive shaft toward the side of the crushing tooth under the control of the control mechanism to switch between the matching position and the hiding position. This arrangement ensures that the movement of the ejector assembly does not interfere with the rotation of the impeller, thereby ensuring the feasibility and reliability of the structure.

[0008] When debris is entangled in the impeller, the control mechanism controls the ejector assembly to move toward the crushing teeth, pushing the debris in the blade groove toward the crushing teeth and contacting with the crushing teeth for engagement and crushing. After the crushing operation is completed, the ejector assembly is hidden in the blade groove of the impeller so that the presence of the ejector assembly does not interfere with the normal flow of the fluid. This setting structure can reduce the occurrence of impeller entanglement and jamming while ensuring a large flow rate, thereby ensuring the working efficiency of the pump head and making it more versatile and practical.

[0009] It is further configured as follows: the control mechanism includes a linkage reduction assembly connected to the drive shaft, a reciprocating member connected to the linkage reduction assembly and realizing reciprocating motion, and a linkage assembly that links the reciprocating member and the ejection assembly.

[0010] By adopting the above technical solution, the output speed of the drive shaft is reduced by setting a linkage reduction assembly, and the ejection assembly is driven to perform reciprocating ejection motion by the cooperation of the reciprocating member and the linkage assembly, so that the ejection assembly does not need to be driven by an additional drive source, which saves energy and enables it to better adapt to the original installation environment for the drive pump. The frequency of ineffective work of the ejection assembly is reduced under the action of the linkage reduction assembly, thereby extending the service life of the structure and reducing the impact of the ejection assembly action on the fluid flow.

[0011] It is further configured as follows: the ejection assembly includes a linkage disk sleeved on the drive shaft and a connecting ejector rod connecting the linkage disk and each ejection feature, and the ejection feature is an ejection block located in the leaf groove.

[0012] By adopting the above technical solution, the top block forms a whole in cooperation with the connecting top rod and the linkage disk, so as to realize synchronous driving control of several top blocks.

[0013] It is further configured as follows: the movable structure is a movable hole arranged on the wheel disc and for each connecting push rod to pass through, a plurality of the movable holes are arranged in a one-to-one correspondence with a plurality of connecting push rods, the movable holes are slidably matched with the connecting push rods, and the axis of the connecting push rods is parallel to the axis of the driving shaft.

[0014] By adopting the above technical solution, the connecting push rod passes through the movable hole and forms a sliding fit with it to realize that the ejection component can reciprocate toward the side of the crushing tooth while rotating with the impeller. This setting has a simple structure and lower cost.

[0015] It is further configured as follows: the linkage reduction assembly includes a driving gear that rotates with the drive shaft and a plurality of reduction gear sets that are rotatably arranged in the pump housing and mesh with each other, each of the reduction gear sets includes a large reduction gear and a small reduction gear coaxially fixed with the large reduction gear, and one of the reduction gear sets meshes with the driving gear.

[0016] By adopting the above technical solution, the driving gear rotates with the driving shaft, and the large reduction gear and the small reduction gear of the multiple reduction gear groups cooperate to reduce the speed output by the driving shaft, thereby reducing the action frequency of the ejector assembly and extending its service life.

[0017] It is further configured as follows: the reciprocating component includes a worm rotatably arranged in the pump housing and connected to one of the reduction gear sets, a worm block slidably arranged in the pump housing and capable of engaging with the worm, a return spring connected to the worm block, and a guide assembly for guiding whether the worm block engages with the worm.

[0018] By adopting the above technical solution, a guide component is set up to control whether the worm block is engaged with the worm. When the worm block is engaged with the worm, the worm is driven to move to one side under the action of the worm; when the worm block is separated from the worm, the worm block returns under the action of the return spring, thereby forming the reciprocating motion of the worm block.

[0019] It is further configured as follows: the guide assembly includes a guide groove arranged on the pump housing and a guide rod moving with the worm and extending into the guide groove, the guide groove includes an engagement path and a separation path which is connected to the engagement path at both ends and constitutes a cycle, a guide path for guiding the guide rod to enter the separation path and realize the separation of the worm and the worm is provided at the connection between one end of the separation path and the engagement path, and a first one-way block for limiting the guide rod from returning from the guide path to the engagement path is provided on one side corresponding to the path, and a second one-way block for limiting the guide rod from entering the separation path is provided at the connection between the other end of the separation path and the engagement path.

[0020] By adopting the above technical solution, when the guide rod is located in the bite path, the worm block and the worm are engaged, so that the worm can drive the worm block to slide. When the guide rod enters the guide path from the bite path, the worm block and the worm are separated under the action of the guide path, so as to release the limit formed by the worm block corresponding to the worm block and cooperate with the first one-way block to enable the guide rod to smoothly enter the separation path to cooperate with the return spring to achieve return. During the return process, the guide rod re-enters the bite path from the separation path to engage with the worm, and the second one-way block is used to prevent the guide rod from returning to the separation path, so as to ensure the feasibility of the structure and form a circular guide.

[0021] It is further configured as follows: the linkage assembly includes a circular linkage groove opened in the ejection assembly, a linkage frame slidably arranged on the pump housing and embedded in the linkage groove to form a circumferential rotation and axial linkage therewith, and a linkage block slidably arranged on the linkage frame, and the guide rod is fixedly connected to the linkage block to form a linkage along the worm axis.

[0022] By adopting the above technical solution, the cooperation between the annular linkage groove and the linkage frame ensures that the movement of the linkage frame will not interfere with the normal rotation of the ejection assembly. By setting the linkage block to a sliding manner, it is possible to switch between the engagement path and the separation path, while enabling the linkage block to drive the linkage frame to move along the axis of the drive shaft.

[0023] It is further configured as follows: a side of the wheel disc opposite to the blades is in sealing rotational cooperation with the pump housing and the movable hole is sealingly slidably with the connecting push rod, and the control mechanism is located on a side of the wheel disc opposite to the blades.

[0024] By adopting the above technical solution, the contact between the control mechanism and the fluid is avoided through the setting structure, thereby extending the service life of the control mechanism.

[0025] In summary, the present invention has the following beneficial effects: the present invention can reduce the occurrence of impeller entanglement while ensuring a relatively large flow rate, thereby ensuring the working efficiency of the pump head and making it more universal and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of an embodiment; Figure 2 for Figure 1 Enlarged view of part A in the middle; Figure 3 It is a partial cross-sectional structural schematic diagram of an embodiment; Figure 4 is another partial cross-sectional structural schematic diagram of the embodiment; Figure 5 is a schematic diagram of the structure of the guide groove in the embodiment; Figure 6 It is a schematic diagram of a partial cross-sectional structure of a linkage assembly in an embodiment; Figure 7 It is a partial stereogram of an embodiment.

[0027] In the figure: 1, inner cavity; 2, pump casing; 3, driving shaft; 4, impeller; 41, wheel disc; 42, blade; 43, blade groove; 5, crushing tooth; 6, ejector assembly; 61, linkage disk; 62, connecting ejector rod; 63, ejector block; 7, control mechanism; 71, linkage reduction assembly; 711, driving gear; 712, reduction gear set; 72, reciprocating member; 721, worm; 722, worm block; 723, guide assembly; 7231, guide rod; 7232, bite path; 7233, separation path; 7234, guide path; 7235, first one-way block; 7236, second one-way block; 724, return spring; 73, linkage assembly; 731, linkage groove; 732, linkage frame; 733, linkage block; 8, movable hole; 9, slide frame. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0029] refer to Figures 1 to 7A magnetic drive pump head includes a pump housing 2 having an inner cavity 1, a drive shaft 3 rotatably disposed in the pump housing 2, and an impeller 4 installed in the inner cavity 1 and fixedly connected to the drive shaft 3. The impeller 4 includes a wheel disc 41, a plurality of blades 42 integrally disposed on one side of the wheel disc 41 and distributed around and at intervals, and a blade groove 43 formed between adjacent blades 42, and the wheel disc 41 is fixedly connected to the drive shaft 3. A plurality of crushing teeth 5 are integrally disposed on one side of the wall of the inner cavity 1 corresponding to the blade 42, and the plurality of crushing teeth 5 are distributed around and at intervals around the center of the drive shaft 3. An ejection assembly 6 is disposed on the impeller 4, and the ejection assembly 6 has an ejection feature distributed in each blade groove 43. A movable structure is provided between the ejector assembly 6 and the impeller 4 for the ejector assembly 6 to rotate with the impeller 4 and to reciprocate toward the side of the crushing tooth 5. The ejector assembly 6 moves toward the crushing tooth 5 and has a matching position for matching the crushing tooth 5 and a hiding position for retracting into the blade groove 43. The ejector assembly 6 is connected to a control mechanism 7 for controlling the ejector assembly 6 to switch between the matching position and the hiding position. The side of the wheel disc 41 opposite to the blade 42 and the pump housing 2 are sealed and rotated through a sealing plane bearing. The two end surfaces of the sealing plane bearing are fixedly connected to the wheel disc 41 and the pump housing 2 respectively. The control mechanism 7 is located on the side of the wheel disc 41 opposite to the blade 42.

[0030] The control mechanism 7 includes a linkage reduction assembly 71 connected to the drive shaft 3, a reciprocating member 72 connected to the linkage reduction assembly 71 and realizing reciprocating motion, and a linkage assembly 73 that links the reciprocating member 72 with the ejection assembly 6. The ejection assembly 6 includes a linkage disk 61 mounted on the drive shaft 3 and a connecting ejector rod 62 that is fixedly connected to the linkage disk 61 and each ejection feature, and the ejection feature is an ejection block 63 located in the leaf groove 43. The movable structure is a movable hole 8 opened in the wheel disc 41 and for each connecting ejector rod 62 to pass through, and a plurality of movable holes 8 are arranged in a one-to-one correspondence with a plurality of connecting ejector rods 62. The movable hole 8 is sealed and slidably matched with the connecting ejector rod 62, and the axis of the connecting ejector rod 62 is parallel to the axis of the drive shaft 3. A sealing ring fixed to the wall of the movable hole 8 is provided between the movable hole 8 and the connecting ejector rod 62.

[0031] The linkage reduction assembly 71 includes a driving gear 711 coaxially fixed to the driving shaft 3 and a plurality of reduction gear sets 712 rotatably disposed in the pump housing 2 and meshing with each other. Each reduction gear set 712 includes a large reduction gear and a small reduction gear coaxially fixed to the large reduction gear, wherein the large reduction gear in one reduction gear set 712 meshes with the driving gear 711. Transmission is achieved between two adjacent reduction gear sets 712 by meshing the large reduction gear in one reduction gear set 712 with the small reduction gear in the other reduction gear set 712.

[0032] The reciprocating member 72 includes a worm 721 rotatably disposed in the pump housing 2 and fixedly connected to one of the reduction gear sets 712, a worm block 722 slidably disposed in the pump housing 2 and capable of engaging with the worm 721, a return spring 724 connected to the worm block 722, and a guide assembly 723 for guiding the worm block 722 to engage with the worm 721. One end of the return spring 724 is fixedly connected to the worm block 722, and the other end is fixedly connected to a rotating shaft, and the rotating shaft is rotatably matched with the pump housing 2. Specifically, the worm block 722 is slidably disposed on a slide 9 in the pump housing 2. The slide 9 slides with the pump housing 2 along the radial direction of the worm 721, and the slide 9 passes through the worm block 722 and slides with it to allow the worm block 722 to slide along the axial direction of the worm 721.

[0033] The guide assembly 723 includes a guide groove opened in the pump housing 2 and located on one side of the worm 721, and a guide rod 7231 fixedly connected to the worm block 722 and extending into the guide groove. The guide groove includes an engagement path 7232 and a separation path 7233 that is connected to the engagement path 7232 at both ends and forms a cycle. A guide path 7234 for guiding the guide rod 7231 to enter the separation path 7233 and realize the separation of the worm block 722 from the worm 721 is connected to the connection between one end of the separation path 7233 and the engagement path 7232, and a first one-way block 7235 for limiting the guide rod 7231 from returning from the guide path 7234 to the engagement path 7232 is provided on one side of the path through the rotation of the first rotating shaft. A torsion spring fixedly connected to the first one-way block 7235 and the pump housing 2 is mounted on the first rotating shaft, and the free end of the first one-way block 7235 is driven by the torsion spring to abut against the side wall of the engagement path 7232. A second one-way block 7236 is slidably provided at the connection between the other end of the separation path 7233 and the engagement path 7232 to limit the guide rod 7231 from entering the separation path 7233. The second one-way block 7236 is slidably provided in the pump housing 2 and a positioning spring is fixedly connected between the pump housing 2 and the second one-way block 7236.

[0034] The linkage assembly 73 includes a circular linkage groove 731 provided on the outer peripheral wall of the linkage disk 61, a linkage frame 732 slidably disposed in the pump housing 2 and embedded in the linkage groove 731 to form a circumferential rotational cooperation with the linkage frame 732 and to be linked with the axis, that is, the linkage frame 732 can drive the linkage disk 61 to move along the axis of the drive shaft 3, and a linkage block 733 slidably disposed on the linkage frame 732. The guide rod 7231 is fixedly connected to the linkage block 733 to form a linkage along the axis of the worm 721.

[0035] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A magnetic drive pump head, comprising a pump housing (2) having an inner cavity (1), a drive shaft (3) arranged in the pump housing (2), and an impeller (4) installed in the inner cavity (1) and connected to the drive shaft (3), wherein the impeller (4) comprises a wheel disc (41), a plurality of blades (42) arranged on one side of the wheel disc (41) and distributed around and spaced apart, and blade grooves (43) formed between adjacent blades (42), characterized in that: A crushing tooth (5) is provided on one side of the inner cavity (1) corresponding to the blade (42); an ejection assembly (6) is provided on the impeller (4), and the ejection assembly (6) has ejection features distributed in each blade groove (43); a movable structure is provided between the ejection assembly (6) and the impeller (4) for the ejection assembly (6) to rotate with the impeller (4) and to be able to reciprocate toward one side of the crushing tooth (5); the ejection assembly (6) moves toward the crushing tooth (5) and has a matching position for matching with the crushing tooth (5) and a hiding position for retracting into the blade groove (43); and a control mechanism (7) for controlling the ejection assembly (6) to switch between the matching position and the hiding position is connected to the ejection assembly (6).

2. The magnetic drive pump head according to claim 1, characterized in that: The control mechanism (7) comprises a linkage reduction assembly (71) connected to the drive shaft (3), a reciprocating member (72) connected to the linkage reduction assembly (71) and realizing reciprocating motion, and a linkage assembly (73) constituting a linkage between the reciprocating member (72) and the ejection assembly (6).

3. The magnetic drive pump head according to claim 1, characterized in that: The ejection assembly (6) comprises a linkage disk (61) sleeved on the drive shaft (3) and a connecting ejector rod (62) connecting the linkage disk (61) and each ejection feature, wherein the ejection feature is an ejection block (63) located in the leaf groove (43).

4. The magnetic drive pump head according to claim 3, characterized in that: The movable structure is a movable hole (8) arranged on the wheel disc (41) and for each connecting push rod (62) to pass through, a plurality of the movable holes (8) and a plurality of connecting push rods (62) are arranged in a one-to-one correspondence, the movable holes (8) and the connecting push rods (62) are slidably matched, and the axis of the connecting push rod (62) is parallel to the axis of the driving shaft (3).

5. The magnetic drive pump head according to claim 2, characterized in that: The linkage reduction assembly (71) comprises a driving gear (711) rotating with the driving shaft (3) and a plurality of reduction gear sets (712) rotatably arranged in the pump housing (2) and meshing with each other, each of the reduction gear sets (712) comprising a large reduction gear and a small reduction gear coaxially fixed with the large reduction gear, wherein one of the reduction gear sets (712) meshes with the driving gear (711).

6. The magnetic drive pump head according to claim 5, characterized in that: The reciprocating member (72) comprises a worm (721) rotatably disposed in the pump housing (2) and connected to one of the reduction gear sets (712), a worm block (722) slidably disposed in the pump housing (2) and capable of engaging with the worm (721), a return spring (724) connected to the worm block (722), and a guide assembly (723) for guiding the worm block (722) to engage with the worm (721).

7. The magnetic drive pump head according to claim 6, characterized in that: The guide assembly (723) comprises a guide groove arranged on the pump housing (2) and a guide rod (7231) moving with the volute (722) and extending into the guide groove, the guide groove comprises an engagement path (7232) and a separation path (7233) which is connected to the engagement path (7232) at both ends and forms a cycle, and a connection portion at one end of the separation path (7233) and the engagement path (7232) is provided for guiding the guide rod (7231) into the separation path (7233). A guide path (7234) is provided for separating the worm block (722) from the worm (721), and a first one-way block (7235) is provided on one side of the path corresponding to the guide path for limiting the guide rod (7231) from returning from the guide path (7234) to the engaging path (7232); a second one-way block (7236) is provided at the connection between the other end of the separation path (7233) and the engaging path (7232) for limiting the guide rod (7231) from entering the separation path (7233).

8. The magnetic drive pump head according to claim 7, characterized in that: The linkage assembly (73) comprises a circular linkage groove (731) provided in the ejection assembly (6), a linkage frame (732) slidably arranged on the pump housing (2) and embedded in the linkage groove (731) to form a circumferential rotation linkage with the axis, and a linkage block (733) slidably arranged on the linkage frame (732), and the guide rod (7231) is fixedly connected to the linkage block (733) to form a linkage along the axis of the worm (721).

9. The magnetic drive pump head according to claim 4, characterized in that: The side of the wheel disc (41) opposite to the blade (42) is in sealed rotational cooperation with the pump housing (2), and the movable hole (8) is in sealed sliding cooperation with the connecting push rod (62), and the control mechanism (7) is located on the side of the wheel disc (41) opposite to the blade (42).

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