Screw pump

Abstract

The screw pump comprises a pump body, a feeding chamber and a sealing assembly which are sequentially connected, the pump body comprises a stator and a rotor, and an intermediate shaft connected with the rotor is arranged in the feeding chamber; one end of the connecting shaft is connected with the intermediate shaft, the static ring is arranged on the connecting shaft in a penetrating and sleeving mode and is in clearance fit with the connecting shaft, the movable ring is fixed to the connecting shaft and is in sealing fit with the static ring, and the fixed seat is used for positioning the static ring and is provided with a movable positioning piece. The positioning piece has a locking state in which the positioning piece is matched with the connecting shaft to limit the connecting shaft to move in the axial direction and an unlocking state in which limitation is relieved. The movable positioning piece is arranged on the fixing seat, the state of the positioning piece can be adaptively adjusted in different use scenes, namely, the locking state for limiting the connecting shaft to move in the axial direction and the unlocking state for releasing limitation can be switched, compared with the prior art, the problem that the connecting shaft moves under the influence of external force is solved, and the service life of the connecting shaft is prolonged. And the sealing assembly can be better protected.

Description

Technical Field

[0001] The present application relates to the technical field of screw pumps, and in particular to a screw pump. Background Art

[0002] A screw pump is a type of positive displacement rotor pump that relies on the volume change of the sealed cavity formed by the screw (rotor) and the bushing (stator) to suck in and discharge liquid. It generally includes a pump body, a feeding chamber, a sealing assembly and a drive device connected in sequence.

[0003] In order to facilitate transportation and installation, the existing screw pump is transported after assembling the pump body, feeding chamber and sealing assembly, wherein the feeding chamber has an intermediate shaft inside, and the sealing assembly includes a connecting shaft connected to the intermediate shaft of the feeding chamber at one end, a fixed seat, a static ring and a dynamic ring. During the bumpy transportation, the connecting shaft is prone to move, causing damage to the sealing assembly, so further improvement is needed. Summary of the invention

[0004] The invention provides a screw pump, which can prevent a connecting shaft from moving during bumpy transportation, so as to protect a sealing component.

[0005] The present application provides a screw pump, which includes a pump body, a feeding chamber and a sealing assembly connected in sequence, the pump body includes a stator and a rotor matched with the stator, an intermediate shaft connected to the rotor is arranged inside the feeding chamber, the sealing assembly includes a connecting shaft connected to the intermediate shaft at one end, a static ring sleeved on the connecting shaft and gap-matched with the static ring, and a dynamic ring fixed on the connecting shaft and sealingly matched with the static ring, the sealing assembly also includes a fixing seat for positioning the static ring, a movable positioning member is arranged on the fixing seat, and the positioning member has a locking state that cooperates with the connecting shaft to limit the axial movement of the connecting shaft and a releasing state that releases the restriction.

[0006] Several optional methods are also provided below, but they are not intended to be additional limitations on the above-mentioned overall solution, but are merely further supplements or preferences. Under the premise that there are no technical or logical contradictions, each optional method can be combined with the above-mentioned overall solution separately, and multiple optional methods can also be combined.

[0007] Optionally, the positioning member is rotatably connected to the fixing seat, and the positioning member can rotate around an axis parallel to the connecting shaft.

[0008] Optionally, the positioning member is fixed to the fixing seat by bolts, and the bolts can lock or loosen the positioning member.

[0009] Optionally, a washer is provided between the bolt and the positioning member.

[0010] Optionally, the positioning member is runway-shaped as a whole, with semicircular structures at both ends. The rotation center of the positioning member is set at the center of one of the semicircular structures. In the locked state, the length direction of the positioning member is the same as the radial extension direction of the fixing seat.

[0011] Optionally, a slot is provided on the connecting shaft, and in the locked state, the positioning member partially extends into the slot.

[0012] Optionally, the slot is an annular structure, and the number of the positioning members is multiple and arranged around the connecting axis.

[0013] Optionally, the positioning member is rotatable relative to the fixing seat, and the positioning member has a clamping portion that cooperates with the clamping slot, and the clamping portion is an arc-shaped structure.

[0014] Optionally, the fixing seat includes a supporting portion and a mounting portion arranged inside and outside, the mounting portion is an annular structure as a whole, having a relative front end and a rear end, the stationary ring is fixed at the front end of the mounting portion, and the positioning member is arranged at the rear end of the mounting portion.

[0015] Optionally, the rear end surface of the mounting portion is a plane, and the positioning member is a sheet-like structure abutting against the plane.

[0016] The screw pump of the present application is provided with a movable positioning member on the fixed seat, which can adaptively adjust the state of the positioning member in different usage scenarios, that is, it can switch between a locking state that limits the axial movement of the connecting shaft and a releasing state that releases the restriction. Compared with the prior art, the problem of movement of the connecting shaft under the influence of external force is avoided, and the sealing assembly can be better protected. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a screw pump in the prior art;

[0018] Figure 2 for Figure 1 Partial view of the screw pump;

[0019] Figure 3 A cross-sectional view of a sealing assembly according to an embodiment of the present application;

[0020] Figure 4 This is a structural schematic diagram of a positioning member of a sealing assembly in an embodiment of the present application in a locked state;

[0021] Figure 5 This is a structural schematic diagram of a positioning member of a sealing assembly according to an embodiment of the present application in a released state;

[0022] Figure 6 for Figure 5 Schematic diagram of the structure of the middle installation part.

[0023] The reference numerals in the figures are described as follows:

[0024] 100, pump body; 110, stator; 120, rotor;

[0025] 200, feeding chamber; 210, intermediate shaft;

[0026] 300, sealing assembly; 310, connecting shaft; 311, clamping groove; 320, stationary ring; 330, dynamic ring; 340, fixing seat; 341, supporting portion; 342, first mounting surface; 343, second mounting surface; 344, through hole; 345, first step; 350, mounting portion; 351, transition section; 352, first diameter expansion section; 353, second step; 354, second diameter expansion section; 355, third step; 356, limiting ring; 360, positioning member; 361, clamping portion; 370, bolt; 380, washer;

[0027] 400, driving device; 410, speed reducer; 420, driver. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] It should be noted that when a component is referred to as being "connected" to another component, it may be directly connected to the other component or there may be a central component. When a component is referred to as being "disposed on" another component, it may be directly disposed on the other component or there may be a central component at the same time.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0031] In this application, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number or order of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0032] In this application, the terms "comprises" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a system, product or device comprising a series of units is not necessarily limited to those units explicitly listed, but may include other units not explicitly listed or inherent to these products or devices.

[0033] See also Figure 1 to Figure 3 An embodiment of the present application provides a screw pump, which includes a pump body 100, a feeding chamber 200 and a sealing assembly 300 connected in sequence. The pump body 100 has a feeding end and a discharging end, and includes a stator 110 and a rotor 120 matched with the stator 110. An intermediate shaft 210 connected to the rotor 120 is arranged inside the feeding chamber 200. The sealing assembly 300 includes a connecting shaft 310 connected to the intermediate shaft 210 at one end, a static ring 320 sleeved on the connecting shaft 310 and loosely matched with the static ring 320, and a dynamic ring 330 fixed on the connecting shaft 310 and sealingly matched with the static ring 320. The sealing assembly 300 also includes a fixing seat 340 for positioning the static ring 320.

[0034] Of course, the screw pump also includes a driving device 400 connected to the sealing assembly 300 , the driving device 400 includes a reducer 410 and a driver 420 for providing power (for example, a motor is used in the figure), and the other end of the connecting shaft 310 is connected to the output shaft of the reducer 410 .

[0035] In order to facilitate installation, the existing screw pump is transported after assembling the pump body 100, the feeding chamber 200 and the sealing assembly 300, and then fixedly connected with the driving device 400 after being transported to the destination. However, in the actual transportation process, the vehicle will be bumpy due to various reasons such as road conditions, and during the bumpy process, the connecting shaft 310 is easy to move, causing damage to the sealing assembly 300, so improvement is needed.

[0036] To solve the above problems, see Figure 3 to Figure 5 A movable positioning member 360 is provided on the fixed seat 340 of the sealing device of the present application. The positioning member 360 has a locking state that cooperates with the connecting shaft 310 to limit the axial movement of the connecting shaft 310 and a releasing state that releases the restriction.

[0037] The screw pump of the present application can adjust the use status of the positioning member 360 in different usage scenarios, that is, the positioning member 360 is set to a locked state during transportation. When the sealing assembly 300 is connected to the driving device 400, the positioning member 360 is adjusted to a released state to enable the connecting shaft 310 to rotate normally. Compared with the prior art, the sealing assembly 300 can be better protected.

[0038] In order to cooperate with the connecting shaft 310, a slot 311 is provided on the connecting shaft 310. In the locked state, Figure 4 As shown, the positioning member 360 partially extends into the card slot 311. When the lock needs to be released, refer to Figure 5 , remove the positioning member 360 from the slot 311, and the lock is released. The slot 311 is an annular structure. Considering the stability of the structure when locked, the number of positioning members 360 is multiple and arranged around the connecting shaft 310. Of course, the specific number can be adaptively selected according to the needs, and this application does not make special requirements. For example, the number of positioning members 360 shown in the figure is 4, and they are evenly arranged along the circumference.

[0039] Furthermore, the positioning member 360 is rotatable relative to the fixing seat 340 , and the positioning member 360 has a locking portion 361 that cooperates with the locking slot 311 . In order to enable the positioning member 360 to better cooperate with the locking slot 311 , the locking portion 361 is an arc-shaped structure.

[0040] In one embodiment, the positioning member 360 is rotatably connected to the fixing seat 340, and the positioning member 360 can rotate around an axis parallel to the connecting shaft 310. For details, see Figure 6 The positioning member 360 is fixed to the fixing seat 340 by means of a bolt 370, and the bolt 370 can lock or loosen the positioning member 360. When the state of the positioning member 360 needs to be adjusted, the bolt 370 is loosened and the angle of the positioning member 360 is adjusted accordingly until it is in a preset state, and then the bolt 370 is used to lock the positioning member 360, so that the positioning member 360 remains fixed in the preset state.

[0041] Of course, in order to protect the positioning member 360 and increase the fastening force, a washer 380 is provided between the bolt 370 and the positioning member 360. Preferably, the washer 380 is an open washer.

[0042] Regarding the shape of the positioning member 360, for example, as shown in the figure, the positioning member 360 is runway-shaped as a whole, and its two ends are semicircular structures. The rotation center of the positioning member 360 is set at the center position of one of the semicircular structures. In the locked state, the length direction of the positioning member 360 is the same as the radial extension direction of the fixing seat 340.

[0043] See also Figure 3 to Figure 5The fixed seat 340 includes a supporting portion 341 and a mounting portion 350 arranged inside and outside. The mounting portion 350 is an annular structure as a whole, having a front end and a rear end relative to each other. The stationary ring 320 is fixed at the front end of the mounting portion 350, and the positioning member 360 is arranged at the rear end of the mounting portion 350.

[0044] In order to facilitate the installation and rotation of the positioning member 360, the rear end surface of the mounting portion 350 is a plane, and the positioning member 360 is a sheet-like structure that abuts against the plane.

[0045] In one embodiment, see Figure 3 The mounting portion 350 is clamped and fixed between the feeding chamber 200 and the supporting portion 341. Specifically, the supporting portion 341 is a frame structure, having a first mounting surface 342 fixed to the feeding chamber 200 and a second mounting surface 343 fixed to the driving device 400. The first mounting surface 342 and the second mounting surface 343 are both provided with a through hole 344 for the connecting shaft 310 to pass through. The hole wall of the through hole 344 located on the first mounting surface 342 is partially enlarged to form a first step 345. The mounting portion 350 includes an outer peripheral surface and an inner peripheral surface. A stop ring 356 is convexly provided on the outer peripheral surface. The mounting portion 350 is clamped between the feeding chamber 200 and the first step 345 through the stop ring 356.

[0046] Furthermore, the inner circumference of the mounting portion 350 includes a transition section 351, a first diameter expansion section 352, and a second diameter expansion section 354, which are arranged in sequence. A second step 353 is formed at the junction of the first diameter expansion section 352 and the transition section 351, and a third step 355 is formed at the junction of the second diameter expansion section 354 and the first diameter expansion section 352. The stationary ring 320 is partially reduced in diameter and extends into the mounting portion 350 to be fixedly connected thereto. Considering the sealing problem, a sealing ring (such as Figure 3 P position in the image).

[0047] Before the screw pump of the present application is installed with the drive device 400, the positioning member 360 of the sealing assembly 300 is set in a locked state that limits the axial movement of the connecting shaft 310, so as to avoid the problem that the connecting shaft 310 moves and damages the sealing assembly 300 under the influence of the outside world. Since the corresponding connecting shaft 310 is also in a rotating state when the screw pump rotates normally, after the drive device 400 is installed and before the screw pump is operated, it is necessary to loosen the bolt 370 and rotate the positioning member 360 to release the restriction on the connecting shaft 310 (otherwise the screw pump will be damaged), and lock the positioning member 360 in this position (not only can the positioning member state be adjusted, but also can be used again when the accessories are replaced next time), so that the positioning member 360 is in a released state.

[0048] The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. When the technical features in different embodiments are embodied in the same figure, it can be regarded that the figure also discloses the combination examples of the various embodiments involved.

[0049] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application.

Claims

1. A screw pump, the screw pump comprising a pump body, a feeding chamber and a sealing assembly connected in sequence, the pump body comprising a stator and a rotor matched with the stator, an intermediate shaft connected to the rotor is arranged inside the feeding chamber, the sealing assembly comprises a connecting shaft connected to the intermediate shaft at one end, a static ring sleeved on the connecting shaft and matched with the static ring with a clearance, and a dynamic ring fixed on the connecting shaft and matched with the static ring in a sealing manner, the sealing assembly also comprising a fixing seat for positioning the static ring, characterized in that: The fixing seat is provided with a movable positioning member, and the positioning member has a locking state for cooperating with the connecting shaft to limit the axial movement of the connecting shaft and a releasing state for releasing the restriction.

2. The screw pump according to claim 1, characterized in that: The positioning member is rotatably connected to the fixing seat, and the positioning member can rotate around an axis parallel to the connecting shaft.

3. The screw pump according to claim 2, characterized in that: The positioning member is fixed to the fixing seat by bolts, and the bolts can lock or loosen the positioning member.

4. The screw pump according to claim 3, characterized in that: A washer is arranged between the bolt and the positioning member.

5. The screw pump according to claim 2, characterized in that: The positioning member is runway-shaped as a whole, with semicircular structures at both ends. The rotation center of the positioning member is set at the center of one of the semicircular structures. In the locked state, the length direction of the positioning member is the same as the radial extension direction of the fixing seat.

6. The screw pump according to claim 1, characterized in that: The connecting shaft is provided with a slot, and in the locked state, the positioning member partially extends into the slot.

7. The screw pump according to claim 6, characterized in that The clamping groove is an annular structure, and the number of the positioning members is multiple and arranged around the connecting shaft.

8. The screw pump according to claim 6, characterized in that: The positioning member is rotatable relative to the fixing seat, and the positioning member has a clamping portion matched with the clamping slot, and the clamping portion is an arc-shaped structure.

9. The screw pump according to claim 1, characterized in that: The fixing seat includes a supporting portion and a mounting portion arranged inside and outside. The mounting portion is an annular structure as a whole, having a front end and a rear end opposite to each other. The stationary ring is fixed at the front end of the mounting portion, and the positioning member is arranged at the rear end of the mounting portion.

10. The screw pump according to claim 9, characterized in that The rear end surface of the mounting portion is a plane, and the positioning member is a sheet-like structure abutting against the plane.

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