CN220168137U - Flexible connection structure and vertical screw pump - Google Patents

Abstract

The utility model discloses a flexible connection structure and a vertical screw pump, wherein the flexible connection structure comprises: the flexible connecting rod is characterized in that a first joint and a second joint are respectively arranged at two ends of the flexible connecting rod, and a plurality of blind holes are formed in the first joint and the second joint along the circumferential direction; the rotor is provided with a first connecting sleeve capable of accommodating the first joint at one end, the first connecting sleeve is provided with a plurality of first mounting holes arranged along the circumferential direction, all the first mounting holes of the first connecting sleeve and all the blind holes of the first joint are respectively arranged in a one-to-one correspondence manner, and the first mounting holes and the corresponding blind holes are commonly connected with a first connecting piece; a driving shaft, the connection structure of which with the second joint is identical to the connection structure of the rotor with the first joint. Compared with the prior art, the utility model can realize the forward and reverse rotation of the rotor in the micro screw pump, and effectively widens the application range of the micro screw pump.

Description

Flexible connection structure and vertical screw pump

Technical Field

The utility model relates to the technical field of screw pumps, in particular to a flexible connection structure and a vertical screw pump.

Background

The screw pump is a positive displacement pump, and its main working components are the screw of eccentric screw (called rotor) and the screw bush whose inner surface is double-line screw surface (called stator). The screw pump works in the principle that when the motor drives the driving shaft to rotate, the driving shaft is flexibly connected with the rotor through the connecting rod, so that the rotor can rotate around the axis of the rotor and roll along the inner surface of the stator, and a sealing cavity of the pump is formed. The liquid in the seal chambers advances by a pitch every revolution of the rotor, and as the rotor continues to rotate, the fluid is pressed in a spiral manner from one seal chamber to the other seal chamber and finally is forced out of the pump body.

In a part of working scenes, the screw pump needs to rotate forward or reversely so as to realize two functions of liquid discharge and liquid suction. For the screw pump with larger specification, the rotor and the connecting rod are connected by adopting the universal joint, and the universal joint can bear forward rotation torque and reverse rotation torque, so that the screw pump can realize forward rotation and reverse rotation. In the screw pump of the small size, the universal joint cannot be used because the internal space is limited, so that the connection between the rotor and the connecting rod is generally realized by the screw sleeve in the prior art, but the screw pump of the type cannot realize forward and reverse rotation because the screw sleeve has a single rotation direction.

For this reason, development of a micro screw pump capable of achieving forward and reverse rotation is needed to meet different market demands.

Disclosure of Invention

The utility model aims to provide a flexible connecting structure which solves the technical problem of how to realize the forward and reverse rotation of a rotor in a miniature screw pump.

A flexible connection structure according to an embodiment of the first aspect of the present utility model includes:

the flexible connecting rod is characterized in that a first joint and a second joint are respectively arranged at two ends of the flexible connecting rod, and a plurality of blind holes are formed in the first joint and the second joint along the circumferential direction;

the rotor is provided with a first connecting sleeve capable of accommodating the first joint at one end, the first connecting sleeve is provided with a plurality of first mounting holes arranged along the circumferential direction, all the first mounting holes of the first connecting sleeve are respectively arranged in one-to-one correspondence with all the blind holes of the first joint, the first mounting holes and the corresponding blind holes are commonly connected with a first connecting piece, and the first connecting sleeve and the first joint are detachably connected through the first connecting piece;

the drive shaft, its one end is equipped with can hold the second adapter sleeve of second festival head, the second adapter sleeve is equipped with a plurality of second mounting holes that set up along circumference, all second mounting holes of second adapter sleeve with all blind holes of second festival head set up one-to-one respectively, the second mounting hole with corresponding the blind hole is connected with the second connecting piece jointly, the second adapter sleeve with the second festival head is through the second connecting piece carries out detachable connection.

The flexible connecting structure provided by the embodiment of the utility model has at least the following beneficial effects: because the torque output by the micro screw pump is smaller, the flexible connecting structure can meet the working condition of the micro screw pump, and the arrangement of the blind holes can not only avoid excessive machining of the joint head so as to improve the deflection of the flexible connecting rod and prolong the service life of the flexible connecting rod, but also realize the multipoint transmission of the torque so as to improve the planetary rotation effect of the rotor in the stator; compared with the prior art, the utility model can realize the forward and reverse rotation of the rotor in the micro screw pump, and effectively widens the application range of the micro screw pump.

According to some embodiments of the utility model, in order to subject the flexible connecting rod to a uniform moment direction, the first joint and the second joint are each circumferentially and uniformly provided with a plurality of blind holes.

According to some embodiments of the utility model, in order to realize the detachable connection of the connecting sleeve and the joint, the first mounting hole and the second mounting hole are screw holes, and the first connecting piece and the second connecting piece are screws.

According to some embodiments of the utility model, in order to realize the detachable connection of the connecting sleeve and the joint, the blind hole of the first joint and the blind hole of the second joint are screw holes, and the first connecting piece and the second connecting piece are screws.

According to some embodiments of the utility model, the flexible link is a nylon member, a polyethylene member, or a polyvinyl chloride member. The flexible connecting rod is an injection molding part, so that the flexible connecting rod has the advantages of high production efficiency and low cost, and the flexibility is larger, so that the flexible connecting rod is very suitable for screw pumps with slightly larger eccentric values.

According to a second aspect of the present utility model, a vertical screw pump includes a power system, a bearing housing, a suction chamber, a stator, and the flexible connection structure described above, wherein the bearing housing, the suction chamber, and the stator are sequentially connected from top to bottom, the power system drives a transmission shaft, the transmission shaft passes through the bearing housing and extends into the suction chamber, the transmission shaft located in the suction chamber is connected with the rotor through the flexible connection rod, and the rotor performs a spiral motion in the stator.

The vertical screw pump provided by the embodiment of the utility model has at least the following beneficial effects: the vertical screw pump adopts the flexible connection structure so as to realize the positive and negative rotation of the rotor in a limited space, and the flexible connecting rod and each connecting piece belong to the vulnerable parts of stress, but can be detachably connected with the transmission shaft and the rotor, so that compared with the existing screw pump adopting a universal joint, the vertical screw pump has lower maintenance cost and higher maintenance efficiency.

According to some embodiments of the utility model, a helical blade is fixedly connected to the outer peripheral surface of the flexible connecting rod, so as to accelerate the downward flow of the medium in the suction chamber.

According to some embodiments of the utility model, a framework oil seal is connected to the lower end of the bearing seat, and the framework oil seal is connected with the transmission shaft in a sealing manner. The framework oil seal is arranged, so that the tightness of the suction chamber can be enhanced, and medium overflow from the bearing seat to the power system is avoided.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

fig. 1 is a schematic perspective view of a vertical screw pump according to an embodiment of the present utility model;

FIG. 2 is a top view of the vertical screw pump shown in FIG. 1;

fig. 3 is a cross-sectional view of the vertical screw pump shown in fig. 2 taken along section line A-A.

In the accompanying drawings: 100-flexible connecting rod, 200-rotor, 300-transmission shaft, 110-first joint, 120-second joint, 101-blind hole, 210-first connecting sleeve, 211-first mounting hole, 400-first connecting piece, 310-second connecting sleeve, 311-second mounting hole, 400-second connecting piece, 10-flexible connecting structure, 20-bearing seat, 30-suction chamber, 40-stator, 21-bearing, 22-framework oil seal, 50-helical blade, 31-injection port.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

As shown in fig. 3, the flexible connection structure according to the first aspect of the embodiment of the present utility model includes a flexible connecting rod 100, a rotor 200 and a transmission shaft 300, wherein the flexible connecting rod 100 is a long rod with flexibility, two ends of the flexible connecting rod are respectively provided with a first joint 110 and a second joint 120, the size of the first joint 110 and the size of the second joint 120 are both larger than the middle size of the flexible connecting rod 100, three blind holes 101 are circumferentially distributed on the first joint 110 and the second joint 120, and the depth of the blind holes 101 is not larger than one quarter of the joint diameter, so as to reduce the influence on the structural strength of the joints.

Correspondingly, a first connecting sleeve 210 is disposed at one end of the rotor 200, the first connecting sleeve 210 is of a hollow structure, and can accommodate the first joint 110, the inner diameter of the first connecting sleeve 210 is slightly larger than the outer diameter of the first joint 110, the first connecting sleeve 210 is provided with three first mounting holes 211 disposed along the circumferential direction, and all the first mounting holes 211 of the first connecting sleeve 210 and all the blind holes 101 of the first joint 110 are disposed in one-to-one correspondence. When the first mounting hole 211 is a screw hole, the screw-shaped first connector 400 is first screwed with the first mounting hole 211 and extends into the blind hole 101 of the first joint 110 as the screwing proceeds. Alternatively, when the blind hole 101 of the first joint 110 is a screw hole, the screw-shaped first connecting member 400 first passes through the first mounting hole 211 and is screwed with the blind hole 101 of the first joint 110, and then extends into the blind hole 101 of the first joint 110 as the screwing proceeds. Since the inner diameter of the blind hole 101 of the first joint 110 and the inner diameter of the first mounting hole 211 are equal to the outer diameter of the first connector 400, the first connector 400 is configured to define the relative position between the first connector sleeve 210 and the first joint 110, so that torque can be transmitted between the two through the first connector 400 and the first connector 400 can be detachably connected.

In the same way, one end of the transmission shaft 300 is provided with a second connecting sleeve 310, the second connecting sleeve 310 is of a hollow structure, the second connecting sleeve 310 can accommodate the second joint 120, the inner diameter of the second connecting sleeve 310 is slightly larger than the outer diameter of the second joint 120, the second connecting sleeve 310 is provided with three second mounting holes 311 arranged along the circumferential direction, and all the second mounting holes 311 of the second connecting sleeve 310 and all the blind holes 101 of the second joint 120 are respectively arranged in a one-to-one correspondence. When the second mounting hole 311 is a screw hole, the screw-shaped second connecting member 500 is first screwed with the second mounting hole 311 and extends into the blind hole 101 of the second joint 120 as the screwing proceeds. Alternatively, when the blind hole 101 of the second joint 120 is a screw hole, the screw-shaped second connecting member 500 first passes through the second mounting hole 311 and is screwed with the blind hole 101 of the second joint 120, and then extends into the blind hole 101 of the second joint 120 as the screwing proceeds. Because the inner diameter of the blind hole 101 of the second joint 120 and the inner diameter of the second mounting hole 311 are equal to the outer diameter of the second connecting member 500, the arrangement of the second connecting member 500 can limit the relative position between the second connecting sleeve 310 and the second joint 120, so that torque can be transmitted between the two through the second connecting member 500 and the second connecting member 500 can be detachably connected.

It should be understood that the number of blind holes 101 on each joint is not limited, the number of blind holes 101 in each group may be two, four, etc., and correspondingly, the number of the first mounting holes 211 and the number of the second mounting holes 311 may be two, four, etc., which is not limited to the above embodiment. In addition, the position of the blind holes 101 on each joint is not limited, and each group of blind holes 101 may not be circumferentially and uniformly distributed on the corresponding joint, but in order to make the flexible connecting rod 100 receive a uniform moment direction so as to prolong the service life of the flexible connecting rod 100, it is preferable that each group of blind holes 101 be circumferentially and uniformly distributed on the corresponding joint.

With the above structure, because the torque output by the micro screw pump is smaller, the flexible connection structure 10 can meet the working condition of the micro screw pump, and the arrangement of the plurality of blind holes 101 can avoid excessive processing of the joint, so as to improve the deflection of the flexible connecting rod 100 and prolong the service life of the flexible connecting rod 100, and can realize the multipoint transmission of the torque, so as to improve the planetary rotation effect of the rotor 200 in the stator 40. Compared with the prior art, the utility model can realize the forward and reverse rotation of the rotor 200 in the micro screw pump, effectively widens the application range of the micro screw pump and promotes the development of the screw pump.

In some embodiments of the present utility model, the flexible connecting rod 100 may be an injection molding piece or a metal piece, and when the flexible connecting rod 100 is an injection molding piece, for example, a nylon member, a polyethylene member or a polyvinyl chloride member, it can be integrally formed by an injection molding process, so as to avoid a subsequent machining step, and the present utility model has advantages of high production efficiency, low cost, acid and alkali resistance, corrosion resistance, etc., and the flexibility is also larger, so that the present utility model is very suitable for a screw pump with a slightly larger eccentric amount. When the flexible connecting rod 100 is a metal piece, such as a titanium alloy member or a 304 stainless steel member, the force transmission is more stable and the service life is longer, although it requires subsequent machining.

It will be appreciated that the flexible connecting rod 100 may be made of different materials according to actual production conditions, for example, in a low torque condition, the flexible connecting rod 100 is preferably an injection molded part, and in a condition with a certain requirement on torque, the flexible connecting rod 100 is preferably a metal part.

Although in the prior art, there is a connection mode of replacing the screw with a cylindrical pin, at this time, the blind holes 101 on the two joints are replaced by a pin hole, that is, the joints and the connecting sleeve are connected by the cylindrical pin. However, because the pin hole is complex to process, the structural strength of the joint is further reduced due to the pin hole, so that the service life of the flexible connecting rod 100 is not prolonged and reduced, and the cylindrical pin is more troublesome to disassemble, which is not beneficial to the maintenance of the flexible connecting structure 10.

As shown in fig. 1 to 3, the vertical screw pump according to the second aspect of the embodiment of the present utility model includes the flexible connection structure 10 according to the above-described first aspect of the embodiment of the present utility model, and further includes a power system (not shown in the drawings), a bearing housing 20, a suction chamber 30, and a stator 40, the bearing housing 20, the suction chamber 30, and the stator 40 being sequentially connected from top to bottom, the power system mainly including a motor whose main shaft is connected to the driving shaft 300 through a coupling, the bearing housing 20 passing through the suction chamber 30 and extending into the interior of the suction chamber 30, the bearing housing 20 having a plurality of bearings 21 therein, the driving shaft 300 passing through the bearing housing 20 and extending into the suction chamber 30, and the driving shaft 300 located in the suction chamber 30 being connected to the rotor 200 through the flexible connection rod 100, so that the motor can drive the rotor 200 to perform a spiral motion in the stator 40, thereby pushing the medium in the suction chamber 30 to the outside of the stator 40.

The vertical screw pump adopts the flexible connection structure 10 to realize the forward and reverse rotation of the rotor 200 in a limited space, and although the flexible connection rod 100 and each connection piece belong to the vulnerable parts subjected to stress, the flexible connection rod can be detachably connected to the transmission shaft 300 and the rotor 200, so that compared with the existing screw pump adopting a universal joint, the vertical screw pump has lower maintenance cost and higher maintenance efficiency.

It should be noted that, because the medium in the vertical screw pump can be discharged along the direction of gravity, the leakage risk of the medium is low, so the vertical screw pump does not need to be provided with a sealing chamber required by a common screw pump, so as to simplify the internal structure and save the manufacturing cost. If the tightness of the suction chamber 30 needs to be further enhanced, medium is prevented from overflowing from the bearing seat 20 to the power system, a framework oil seal 22 is connected to the lower end of the bearing seat 20, and the framework oil seal 22 is in sealing connection with the transmission shaft 300.

As shown in fig. 3, in some embodiments of the present utility model, a spiral blade 50 is fixedly connected to a middle portion of the flexible link 100, and when the flexible link 100 is rotated by the motor, the spiral blade 50 is rotated accordingly. Since the screw blade 50 is spirally disposed from the top down, the screw blade 50 in a rotated state can accelerate the downward flow of the medium in the suction chamber 30 to improve the working efficiency of the vertical screw pump.

As shown in fig. 2, in some embodiments of the present utility model, an injection port 31 is formed at the top of the suction chamber 30, and an external delivery pipe can be directly inserted into the suction chamber 30 through the injection port 31, so as to facilitate continuous injection of the medium.

The embodiments of the present utility model have been described in detail with reference to the accompanying drawings, but the present utility model is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present utility model.

Claims (8)

1. A flexible connection structure, comprising:

the flexible connecting rod (100) is provided with a first joint (110) and a second joint (120) at two ends, and the first joint (110) and the second joint (120) are provided with a plurality of blind holes (101) arranged along the circumferential direction;

the rotor (200) is provided with a first connecting sleeve (210) capable of accommodating the first joint (110) at one end, the first connecting sleeve (210) is provided with a plurality of first mounting holes (211) arranged along the circumferential direction, all the first mounting holes (211) of the first connecting sleeve (210) and all blind holes (101) of the first joint (110) are respectively arranged in a one-to-one correspondence manner, the first mounting holes (211) and the corresponding blind holes (101) are commonly connected with a first connecting piece (400), and the first connecting sleeve (210) and the first joint (110) are detachably connected through the first connecting piece (400);

the drive shaft, its one end is equipped with can hold second adapter sleeve (310) of second festival head (120), second adapter sleeve (310) are equipped with a plurality of second mounting holes (311) that set up along circumference, all second mounting holes (311) of second adapter sleeve (310) with all blind holes (101) of second festival head (120) set up in one-to-one respectively, second mounting holes (311) are connected with second connecting piece (500) jointly with blind hole (101) that correspond, second adapter sleeve (310) with second festival head (120) are through second connecting piece (500) carry out detachable connection.

2. The flexible connection structure of claim 1, wherein: the first joint (110) and the second joint (120) are circumferentially and uniformly provided with a plurality of blind holes (101).

3. The flexible connection structure of claim 1 or 2, wherein: the first mounting holes (211) and the second mounting holes (311) are screw holes, and the first connecting piece (400) and the second connecting piece (500) are screws.

4. The flexible connection structure of claim 1 or 2, wherein: the blind holes (101) of the first joint head (110) and the blind holes (101) of the second joint head (120) are screw holes, and the first connecting piece (400) and the second connecting piece (500) are screws.

5. The flexible connection structure of claim 1, wherein: the flexible connecting rod (100) is a nylon member, a polyethylene member or a polyvinyl chloride member.

6. A vertical screw pump comprising the flexible connection structure according to any one of claims 1 to 5, further comprising: the motor comprises a power system, a bearing seat (20), a suction chamber (30) and a stator (40), wherein the bearing seat (20), the suction chamber (30) and the stator (40) are sequentially connected from top to bottom, the power system is driven with a transmission shaft (300), the transmission shaft (300) penetrates through the bearing seat (20) and extends into the suction chamber (30), the transmission shaft (300) positioned in the suction chamber (30) is connected with a rotor (200) through a flexible connecting rod (100), and the rotor (200) performs spiral motion in the stator (40).

7. The vertical screw pump of claim 6, wherein: the outer peripheral surface of the flexible connecting rod (100) is fixedly connected with a helical blade (50).

8. The vertical screw pump of claim 6, wherein: the lower end of the bearing seat (20) is connected with a framework oil seal (22), and the framework oil seal (22) is in sealing connection with the transmission shaft (300).