CN216589084U - Internal gear pump for conveying high-viscosity easily-crystallized medium - Google Patents

Abstract

The utility model relates to an internal gear pump for conveying high-viscosity easily-crystallized media. The pump cavity mechanism comprises a pump body, a pump body support body, a pump cover, an outer gear, an inner gear, a liquid inlet control temperature cavity, a liquid outlet control temperature cavity and a pump cavity control temperature cavity, wherein the pump body, the pump body support body and the pump cover are encircled to form a pump cavity; the magnetic driving mechanism comprises an outer pump shaft, a bearing seat, a spacer sleeve, an inner rotor assembly, an outer rotor assembly and a driving motor; the air sealing mechanism comprises an air sealing cavity arranged in the supporting body, an air inlet pipe and an air outlet pipe which are communicated with the air sealing cavity, and the air sealing cavity is communicated with the pump cavity. Compared with the prior art, the utility model adopts the air-tight sealing structure, and the conveying medium maintains a stable liquid level height in the air-tight sealing cavity by introducing nitrogen, thereby achieving the sealing effect, having the advantages of simple structure, convenient operation and the like, and avoiding the adverse effect of the conveying medium on the inner rotor assembly or the bearing.

Description

Internal gear pump for conveying high-viscosity easily-crystallized medium

Technical Field

The utility model belongs to the technical field of gear pumps, and relates to an internal gear pump for conveying a high-viscosity easily-crystallized medium.

Background

The conveying of high-viscosity and easily-crystallized media is a big problem in the field of pump conveying at present. For corrosive or non-corrosive liquid media with the viscosity of 1cst-10000cst, the temperature of-10 ℃ to 200 ℃ and the granularity of less than or equal to 0.02mm, such as acid, alkali liquor, oil, rare and precious liquid without solid particles, or flammable and explosive media, etc., an internal gear pump with mechanical seal or packing seal is generally adopted for conveying. However, because the fluidity of the medium is poor, the intermolecular friction force is large, friction heat is generated between static rings of a high-speed rotating mechanical seal moving ring, the poor-fluidity medium is locally overheated to sinter and denature into a solid, the moving and static rings are bonded, the filler is also easily worn out, if the internal gear pump is driven by magnetic force to convey, the poor-fluidity and easily-crystallized medium flows into the isolation sleeve, the metal isolation sleeve generates eddy heat to enable the medium to bond the inner rotor and the isolation sleeve, the isolation sleeve or the inner rotor is worn out, the medium in the isolation sleeve is prevented from flowing, the temperature of the inner rotor is increased by the eddy heat generated by the isolation sleeve, the temperature is higher than the curie temperature of the magnet of the inner rotor, the magnet is demagnetized, the isolation sleeve is burnt through, the nonmetal isolation sleeve does not generate eddy heat, but the medium is crystallized, the inner rotor and the isolation sleeve are bonded, and the inner rotor and the isolation sleeve are also easily worn out.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an internal gear pump for conveying a high-viscosity easily-crystallized medium.

The purpose of the utility model can be realized by the following technical scheme:

a crescent gear pump for delivering a high viscosity easily crystallizable medium comprising

The pump cavity mechanism comprises a pump body, a support body and a pump cover which are arranged on the upper side and the lower side of the pump body and form a pump cavity by being surrounded with the pump body, an outer gear and an inner gear which are eccentrically arranged in the pump cavity and are meshed with each other, a liquid inlet and a liquid outlet which are arranged on the pump body and are communicated with the pump cavity, a liquid inlet temperature control cavity and a liquid outlet temperature control cavity which are arranged in the pump body and are respectively wound outside the liquid inlet and the liquid outlet, and a pump cavity temperature control cavity which is arranged in the pump cover and is adjacent to the pump cavity;

the magnetic driving mechanism comprises an outer pump shaft, a bearing seat, an isolation sleeve, an inner rotor assembly, an outer rotor assembly and a driving motor, wherein one end of the outer pump shaft is in transmission connection with the outer gear;

the air sealing mechanism comprises an air sealing cavity arranged in the support body, an air inlet pipe and an air outlet pipe, wherein the air inlet pipe and the air outlet pipe are communicated with the air sealing cavity, the air sealing cavity is communicated with the pump cavity, and the outer pump shaft penetrates through the air sealing cavity.

Furthermore, a ventilation gap is arranged at the central connection position between the bearing seat and the support body, and a gap sealing ring is arranged on the periphery of the ventilation gap and surrounds the bearing seat and the support body to form a connection sealing cavity;

between the connecting seal cavity and the air seal cavity, a connecting gap is arranged between the support body and the outer pump shaft, and the air inlet pipe is communicated with the air seal cavity sequentially through the connecting seal cavity and the connecting gap.

Furthermore, a framework oil seal sleeved outside the outer pump shaft is arranged at the connecting gap.

Furthermore, a window is also arranged on the side wall of the airtight cavity.

Furthermore, the isolating sleeve and the bearing seat surround to form an inner rotor accommodating cavity, and an air guide hole for communicating the inner rotor accommodating cavity with the sealing cavity is formed in the bearing seat in a penetrating mode.

Furthermore, a bearing mounting hole penetrates through the bearing seat, and a plurality of bearings are arranged in the bearing mounting hole in parallel one above the other.

Furthermore, a water-cooling cavity surrounding the bearing mounting hole is arranged in the bearing seat, and a water inlet pipe and a water outlet pipe communicated with the water-cooling cavity are arranged on the bearing seat.

Furthermore, the pump body is provided with a plurality of heat medium inlet pipes and heat medium outlet pipes which are respectively communicated with the corresponding liquid inlet temperature control cavity, the liquid outlet temperature control cavity and the pump cavity temperature control cavity.

Furthermore, the pump cover on be equipped with the inner pump axle, inner pump axle overcoat be equipped with the alloy axle sleeve, internal gear cover locate the alloy axle sleeve on.

Further, the outer gear comprises a plurality of outer teeth distributed at intervals along the circumferential direction, so that the conveying medium can pass through the outer teeth;

and a crescent plate is arranged between the outer gear and the inner gear.

Compared with the prior art, the utility model has the following characteristics:

1) the utility model adopts a gas sealing structure, in particular to a gas sealing cavity communicated with the pump cavity is arranged above the pump cavity, namely between the pump cavity and the bearing and the inner rotor assembly, so that a conveying medium can enter the gas sealing cavity, nitrogen with proper flow and pressure is introduced into the gas sealing cavity, the conveying medium maintains a stable liquid level height in the gas sealing cavity, and even the liquid level can be controlled to be not entered into the gas sealing cavity or only a little of the conveying medium is exposed in the gas sealing cavity, thereby achieving the sealing effect, having the advantages of simple structure, convenient operation and the like, and avoiding the adverse effect of the conveying medium on the inner rotor assembly or the bearing;

2) the through hole is formed in the bearing seat, the inner rotor accommodating cavity is communicated with the nitrogen inlet pipe, the effect of cooling the inner rotor assembly or the isolation sleeve can be achieved by adjusting the temperature of the nitrogen, and the influence of eddy heat of the isolation sleeve is reduced;

3) the isolation sleeve is made of PFA and other non-metal isolation sleeves, so that eddy heat generated in alternating magnetic fields of the inner rotor and the outer rotor is avoided;

4) through set up corresponding accuse temperature chamber on the pump body, pump cover to guarantee the transport medium temperature, thereby make it keep good mobility, set up the water-cooling chamber in the bearing frame simultaneously and come to cool down the bearing, thereby avoid the overheated and problem that the structure became invalid of bearing.

Drawings

FIG. 1 is a schematic structural diagram of a ring gear pump for delivering a high viscosity crystallization-prone medium according to an embodiment;

FIG. 2 is a sectional view taken along line A-A of FIG. 1;

FIG. 3 is an enlarged view of a portion of FIG. 1 at B;

the notation in the figure is:

1-pump body, 2-pump cover, 3-support body, 4-external gear, 5-internal gear, 6-liquid inlet, 7-liquid outlet, 8-liquid inlet control temperature cavity, 9-liquid outlet control temperature cavity, 10-pump cavity control temperature cavity, 11-internal pump shaft, 12-alloy shaft sleeve, 13-external pump shaft, 14-bearing, 15-bearing seat, 16-isolation sleeve, 17-internal rotor assembly, 18-external rotor assembly, 19-driving motor, 20-connecting frame, 21-bearing supporting nut, 22-water cooling cavity, 23-air sealing cavity, 24-air inlet pipe, 25-air outlet pipe, 26-gap sealing ring, 27-window, 28-framework oil seal, 29-air guide hole, 30-annular gland, 31-sealing gasket, 32-retainer ring, 33-crescent plate.

Detailed Description

The utility model is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.

Example (b):

an internal gear pump for delivering a high viscosity easy crystallization medium as shown in fig. 1 comprises a pump chamber mechanism, a magnetic driving mechanism, and an air sealing mechanism.

The pump cavity mechanism comprises a pump body 1, a support body 3 and a pump cover 2 which are arranged on the upper side and the lower side of the pump body 1 and surround the pump body 1 to form a pump cavity, an external gear 4 and an internal gear 5 which are eccentrically arranged in the pump cavity and are mutually meshed, a liquid inlet 6 and a liquid outlet 7 which are arranged on the pump body 1 and are communicated with the pump cavity, a liquid inlet temperature control cavity 8 and a liquid outlet temperature control cavity 9 which are arranged in the pump body 1 and respectively surround the liquid inlet 6 and the liquid outlet 7, and a pump cavity temperature control cavity 10 which is arranged in the pump cover 2 and is adjacent to the pump cavity; correspondingly, the pump body 1 is also provided with 3 groups of heat medium inlet pipes and heat medium outlet pipes which are respectively communicated with the corresponding liquid inlet temperature control cavity 8, liquid outlet temperature control cavity 9 and pump cavity temperature control cavity 10. The pump cover 2 is provided with an inner pump shaft 11, an alloy shaft sleeve 12 is sleeved outside the inner pump shaft 11, and the inner gear 5 is sleeved on the alloy shaft sleeve 12 to ensure the rotational lubricity of the inner gear 5.

As shown in fig. 2, the external gear 4 includes a plurality of external teeth that are circumferentially spaced apart so that the conveying medium can pass between adjacent external teeth; a crescent plate 33 is further arranged between the inner gear 5 and the outer gear 4 on the pump cover 2, and the crescent plate 33 from the meshing separation part of the inner gear 5 and the outer gear 4 to the suction chamber and the crescent plate 33 from the crescent plate 33 to the re-meshing part of the inner gear 5 and the outer gear 4 to the extrusion chamber are arranged along the rotation direction.

The magnetic driving mechanism comprises an outer pump shaft 13 with one end in transmission connection with the outer gear 4, a bearing 14 sleeved on the outer pump shaft 13, a bearing seat 15 arranged on the supporting body 3, an isolation sleeve 16 arranged on the bearing seat 15 and surrounding the bearing seat to form an inner rotor accommodating cavity, an inner rotor assembly 17 arranged at the other end of the outer pump shaft 13 and located in the inner rotor accommodating cavity, an outer rotor assembly 18 arranged outside the isolation sleeve 16 and corresponding to the inner rotor assembly 17, a driving motor 19 used for driving the outer rotor assembly 18 to rotate, and a connecting frame 20 arranged between the driving motor 19 and the bearing seat 15.

Bearing mounting holes are formed in the bearing seat 15 in a penetrating manner, and the bearings 14 in the embodiment have 3 groups in total and are respectively arranged at the upper end and the lower end of the bearing mounting hole. The bottom of the lowest bearing 14 is further provided with a bearing support nut 21 which is sleeved on the outer pump shaft 13 for supporting.

In order to avoid the overheating of the bearing 14, a water-cooling cavity 22 surrounding the bearing mounting hole is arranged in the bearing seat 15, a water inlet pipe and a water outlet pipe communicated with the water-cooling cavity 22 are further arranged on the side wall of the bearing seat 15, and the bearing 14 is cooled by continuously flowing cooling water.

The air sealing mechanism comprises an air sealing cavity 23 arranged in the support body 3, and an air inlet pipe 24 and an air outlet pipe 25 which are communicated with the air sealing cavity 23, a ventilation gap is arranged at the central connection position between the bearing seat 15 and the support body 3, a gap sealing ring 26 is arranged at the periphery of the ventilation gap and forms a connecting sealing cavity with the bearing seat 15 and the support body 3 in a surrounding way; between the connecting seal cavity and the air seal cavity 23, a connecting gap (as shown in fig. 1 and 3) is provided between the support body 3 and the outer pump shaft, a framework oil seal 28 is installed at the connecting gap, and the air inlet pipe 24 is communicated with the air seal cavity 23 sequentially through the connecting seal cavity and the framework oil seal 28. The liquid level is controlled in the liquid level range set by the air sealing cavity 23 by using nitrogen, so that nitrogen sealing is realized, better sealing performance is ensured, and pollution or temperature influence of a conveying medium on components such as a bearing and the like is avoided. The good liquid tightness and the poor air tightness of the framework oil seal 28 are utilized, and the splashing of the conveying medium is avoided while nitrogen is introduced. A retainer ring 32 is provided on the frame oil seal 28 to prevent axial displacement of the frame oil seal 28 during operation. In addition, a window 27 is arranged on the side wall of the airtight chamber 23 to effectively monitor the liquid level condition in the airtight chamber 23.

Meanwhile, an air vent 29 for communicating the inner rotor accommodating cavity with the connecting sealing cavity is formed in the bearing seat 15 in a penetrating manner and used for cooling the inner rotor assembly by utilizing circulating nitrogen. In order to ensure the tightness of the inner rotor accommodating cavity, the edge of the isolation sleeve 16 is pressed and fixed through an annular gland 30 and a bolt, and a sealing gasket 31 is further arranged between the edge of the isolation sleeve 16 and the bearing seat 15. Similarly, sealing gaskets are arranged between the support body 3 and the pump body 1 and between the pump body 1 and the pump cover 2, so that the sealing performance is improved, and medium leakage is avoided.

Before the pump is started, heat conduction oil is respectively input into the corresponding liquid inlet temperature control cavity 8, the liquid outlet temperature control cavity 9 and the pump cavity temperature control cavity 10 through the corresponding heat medium inlet pipes to circularly flow so as to ensure the working temperature of the conveying part of the pump, thereby improving the fluidity of the medium or avoiding the crystallization condition. Similarly, cooling water is introduced into the water-cooling chamber 22 through the water inlet pipe to cool the bearing 14. Then, the inlet valves and the outlet valves at the front and the back of the pump are opened for pump filling, and meanwhile, nitrogen is introduced into the air-tight sealing cavity 23 through the nitrogen control cabinet, so that the pressure in the air-tight sealing cavity is higher than the pressure at the inlet of the pump. Then, the driving motor 19 is started to make the external gear 4 rotate around the external pump shaft 13 under the transmission action and drive the internal gear 5 meshed with the external gear to rotate around the internal pump shaft 11, the meshing separation part of the external gear 4 and the internal gear 5, namely the suction chamber, is gradually withdrawn from the meshing state, so that the volume of the suction chamber is increased, the pressure is reduced, and the medium is continuously sucked, meanwhile, the medium entering the tooth grooves enters the extrusion chamber through the rotating gear teeth through the crescent plate 33, the gear teeth gradually enter the meshing state, the tooth grooves are embedded by the meshing gear teeth, the liquid containing volume is reduced, the pressure is increased, and the liquid is extruded. 6 auxiliary blades are uniformly distributed on the end face of the hub of the internal gear 5, the medium is sent into the air-tight sealing cavity by the pressure generated by the auxiliary blades, then the outlet valve is slowly closed, the pressure of the outlet of the pump is slowly increased to the working condition pressure of the pump, the pressure in the air-tight sealing cavity 23 is adjusted to be 1.1 times of the outlet pressure at the moment, the pressure is stabilized and is unchanged, and meanwhile, the air-tight sealing cavity 23 is observed through the window 27, so that the medium does not enter the air-tight sealing cavity.

The embodiments described above are intended to facilitate the understanding and use of the utility model by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.

Claims (10)

1. A crescent gear pump for delivering a high viscosity easily crystallizable medium, comprising

The pump cavity mechanism comprises a pump body (1), a support body (3) and a pump cover (2) which are arranged on the upper side and the lower side of the pump body (1) and surround the pump body (1) to form a pump cavity, an external gear (4) and an internal gear (5) which are eccentrically arranged in the pump cavity and are mutually meshed, a liquid inlet (6) and a liquid outlet (7) which are arranged on the pump body (1) and are communicated with the pump cavity, a liquid inlet temperature control liquid control cavity (8) and a liquid outlet temperature control cavity (9) which are arranged in the pump body (1) and are respectively wound outside the liquid inlet (6) and the liquid outlet (7), and a pump cavity temperature control cavity (10) which is arranged in the pump cover (2) and is adjacent to the pump cavity;

the magnetic driving mechanism comprises an outer pump shaft (13) with one end in transmission connection with the outer gear (4), a bearing (14) sleeved on the outer pump shaft (13), a bearing seat (15) arranged on the supporting body (3), an isolating sleeve (16) arranged on the bearing seat (15), an inner rotor assembly (17) arranged on the other end of the outer pump shaft (13), an outer rotor assembly (18) arranged outside the isolating sleeve (16) and corresponding to the inner rotor assembly (17), and a driving motor (19) used for driving the outer rotor assembly (18) to rotate;

the air sealing mechanism comprises an air sealing cavity (23) arranged in the support body (3), an air inlet pipe (24) and an air outlet pipe (25) communicated with the air sealing cavity (23), the air sealing cavity (23) is communicated with the pump cavity, and the outer pump shaft (13) penetrates through the air sealing cavity (23).

2. An internal gear pump for conveying high-viscosity easy-crystallization media, according to claim 1, characterized in that a central joint between the bearing seat (15) and the support body (3) is provided with a ventilation gap, a gap sealing ring (26) is arranged at the periphery of the ventilation gap, and the ventilation gap, the bearing seat (15) and the support body (3) surround to form a connecting sealing cavity;

between connecting seal chamber and airtight seal chamber (23), supporter (3) and outer pump shaft between be equipped with the joint gap, intake pipe (24) loop through connecting seal chamber, joint gap and airtight seal chamber (23) be linked together.

3. An internal gear pump for conveying high-viscosity easily-crystallized medium according to claim 2, wherein a skeleton oil seal (28) sleeved outside the outer pump shaft (13) is further arranged at the joint gap.

4. A crescent gear pump for the delivery of highly viscous, readily crystallizable media as claimed in claim 1, characterized in that the side wall of the gas-tight chamber (23) is provided with a window (27).

5. An internal gear pump for conveying a high-viscosity easily-crystallized medium according to claim 2, wherein the spacer sleeve (16) and the bearing seat (15) surround to form an inner rotor accommodating cavity, and an air guide hole (29) for communicating the inner rotor accommodating cavity with the connecting sealing cavity is formed in the bearing seat (15) in a penetrating manner.

6. A crescent gear pump for transporting highly viscous, readily crystallizable medium as claimed in claim 1, characterized in that the bearing housing (15) has a bearing mounting bore therethrough, and the bearings (14) are provided in plurality and arranged side by side one above the other in the bearing mounting bore.

7. An internal gear pump for conveying high-viscosity easy-crystallization media according to claim 6, wherein a water cooling cavity (22) surrounding the bearing mounting hole is arranged in the bearing seat (15), and a water inlet pipe and a water outlet pipe communicated with the water cooling cavity (22) are arranged on the bearing seat (15).

8. An internal gear pump for conveying high-viscosity easy-crystallization media according to claim 1, wherein the pump body (1) is provided with a plurality of heat medium inlet pipes and heat medium outlet pipes which are respectively communicated with the corresponding liquid inlet temperature control cavity (8), liquid outlet temperature control cavity (9) and pump cavity temperature control cavity (10).

9. An internal gear pump for conveying high-viscosity easy-crystallization media according to claim 1, wherein the pump cover (2) is provided with an internal pump shaft (11), the internal pump shaft (11) is sleeved with an alloy shaft sleeve (12), and the internal gear (5) is sleeved on the alloy shaft sleeve (12).

10. A crescent gear pump for the delivery of a high viscosity, readily crystallizable medium as claimed in claim 1, wherein said external gear (4) comprises a plurality of circumferentially spaced external teeth such that the delivery medium can pass between adjacent external teeth;

a crescent plate (33) is further arranged between the outer gear (4) and the inner gear (5).

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