Eccentric screw pump

Abstract

The utility model discloses an eccentric screw pump, the middle part of a connecting shaft of the eccentric screw pump is rotatably arranged on a fixed seat through at least two bearings, one end of the fixed seat, which is opposite to a speed reducer, is connected with a feeding cylinder, and one end of the feeding cylinder, which is close to the fixed seat, is internally provided with a sealing component; the other end of the connecting shaft penetrates through the sealing assembly and is eccentrically connected with a first end part of an integrated connecting rod arranged in the feeding cylinder, and the other end of the feeding cylinder is connected with the stator, so that a feeding cavity in the feeding cylinder is communicated with a discharging runner formed between the stator and the rotor; the second end part of the integrated connecting rod is eccentrically connected with one end of the rotor penetrating into the feeding cavity; and the ratio of the outer diameter to the length of the body part of the integrated connecting rod between the first end part and the second end part of the integrated connecting rod is 1: (20-60). According to the utility model, the eccentric connection can be met, and meanwhile, the requirements of selecting food-grade materials and keeping the structure in the feeding cylinder simple can be met.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of screw pump, especially relates to an eccentric screw pump. BACKGROUND

[0002] The screw pump is by the cooperation of screw sleeve and pump body or bushing and forms a constant volume sealed chamber, medium is sent to the pump body middle with screw shaft rotation respectively, both converge together, finally reach the pump outlet, thereby realizing the purpose of pump delivery. The screw pump has the advantages of stable liquid conveying, no pulsation, no stirring, small vibration and low noise, and is widely used in the market. The structure of the screw pump on the market is difficult to meet the sanitary standards of food processing, and the components are complicated, which is not conducive to cleaning and disinfection. SUMMARY

[0003] The utility model solves the technical problem to provide a kind of eccentric screw pump, the eccentric screw pump is convenient for high-frequency cleaning treatment, avoids the case that food material residual in feed cylinder is metamorphosed, can meet eccentric connection while meeting the requirement that food-grade material selection is easily reached and the requirement that the structure in feed cylinder is kept simple.

[0004] To solve the above technical problems, the utility model adopts the technical scheme of: an eccentric screw pump, comprising: motor, the output shaft of motor is connected with speed reducer, one end of the output shaft of speed reducer is connected with connecting shaft, and stator and rotor are matched with each other, the middle part of connecting shaft is rotatably installed on a fixed seat by at least two bearings, the fixed seat is connected with a feed cylinder at one end away from speed reducer, the inside of the feed cylinder near the end of fixed seat is provided with a sealing assembly, the other end of connecting shaft passes through the sealing assembly and is eccentrically connected with the first end of integral link arranged in the feed cylinder, the other end of feed cylinder is connected with stator, so that the feed cavity in feed cylinder is communicated with the discharge flow channel formed between stator and rotor, the second end of integral link is eccentrically connected with one end of rotor inserted into feed cavity, and the ratio of the outer diameter and length of the body part of integral link between the first end and the second end is 1:20-60.

[0005] The further improved scheme in the above technical scheme is as follows:

[0006] 1. In the above scheme, the body part of stator is provided with a shell part outside, and the shell part of stator is connected with feed cylinder.

[0007] 2. In the above scheme, the sealing assembly is arranged at the connection between feed cylinder and fixed seat.

[0008] 3. In the above scheme, the integral link is a stainless steel link.

[0009] 4. The scheme, the integral connecting rod is 316 stainless steel connecting rod.

[0010] 5. The scheme, the output shaft of the speed reducer and the connecting shaft are connected through a shaft coupling.

[0011] 6. The scheme, the shaft coupling is connected between the output shaft of the speed reducer and the connecting shaft through a key groove.

[0012] Due to the use of the above technical scheme, the utility model has the following advantages compared with the prior art:

[0013] The utility model discloses eccentric screw pump, the middle part of its connecting shaft is rotatably installed on a fixed seat through at least two bearings, the one end of fixed seat is connected with a feeding cylinder opposite to the speed reducer, the inside of the one end of feeding cylinder close to fixed seat is provided with a sealing assembly, the other end of connecting shaft passes through the sealing assembly and is eccentrically connected with the first end of integral connecting rod arranged in the feeding cylinder, the other end of feeding cylinder is connected with stator, so that the feeding cavity in feeding cylinder is communicated with the discharge flow channel formed between stator and rotor, the second end of integral connecting rod is eccentrically connected with one end of rotor inserted into the feeding cavity, the ratio of the outer diameter and the length of the body part of integral connecting rod between the first end and the second end is 1:20~60, which can realize the quick disassembly of feeding cylinder and stator rotor, facilitate high-frequency cleaning treatment and avoid the deterioration of food material residues in the feeding cylinder, and meet the requirements of food-grade material selection and simple structure in the feeding cylinder. BRIEF DESCRIPTION OF DRAWINGS

[0014] ATTACHED Figure 1 It is the overall structure schematic diagram of the utility model eccentric screw pump;

[0015] ATTACHED Figure 2 It is the sectional structure schematic diagram of the utility model eccentric screw pump;

[0016] ATTACHED Figure 3 It is Figure 2 The enlarged schematic diagram of the middle part structure.

[0017] In the above drawings: 1, motor;2, speed reducer;3, connecting shaft;41, stator;411, body part;412, shell part;42, rotor;5, fixed seat;51, bearing;52, spacer ring;6, feeding cylinder;61, feeding cavity;62, feeding port;7, sealing assembly;8, integral connecting rod;81, first end;82, second end;83, body part;12, shaft coupling;13, sealing ring;141, first support;142, second support;15, base plate. DETAILED DESCRIPTION

[0018] The present patent can be further understood from the specific embodiments given below, which are not intended to limit the present patent.

[0019] Example 1: An eccentric screw pump, comprising: a motor 1, a speed reducer 2 connected with the output shaft of the motor 1, a connecting shaft 3 with one end connected with the output shaft of the speed reducer 2 and a stator 41 and a rotor 42 matched with each other, the middle part of the connecting shaft 3 is rotatably installed on a fixed base 5 through at least two bearings 51, one end of the fixed base 5 is connected with a feeding cylinder 6, the inside of the feeding cylinder 6 near one end of the fixed base 5 is provided with a sealing assembly 7, the other end of the connecting shaft 3 penetrates through the sealing assembly 7 and is eccentrically connected with the first end part 81 of an integrated connecting rod 8 arranged in the feeding cylinder 6, the other end of the feeding cylinder 6 is connected with the stator 41, so that the feeding cavity 61 in the feeding cylinder 6 is in communication with the discharging flow channel formed between the stator 41 and the rotor 42, the second end part 82 of the integrated connecting rod 8 is eccentrically connected with one end of the rotor 42 penetrating into the feeding cavity 61, the ratio of the outer diameter to the length of the body part 83 of the integrated connecting rod 8 between the first end part 81 and the second end part 82 is 1:40.

[0020] The above-mentioned integrated connecting rod 8 is a 316 stainless steel connecting rod; the outside of the body part 411 of the above-mentioned stator 41 is provided with a shell part 412, the shell part 412 of the stator 41 is connected with the feeding cylinder 6 in a sleeving manner; the above-mentioned sealing assembly 7 is arranged at the connection between the feeding cylinder 6 and the fixed base 5.

[0021] The sidewall of the above-mentioned feeding cylinder 6 near one end of the fixed base 5 is provided with a feeding port 62 in communication with the feeding cavity 61 on the side opposite to the fixed base 5 of the sealing assembly 7.

[0022] Example 2: An eccentric screw pump for conveying large-flow food materials, comprising: an eccentric screw pump, comprising: a motor 1, a speed reducer 2 connected with the output shaft of the motor 1, a connecting shaft 3 with one end connected with the output shaft of the speed reducer 2 and a stator 41 and a rotor 42 matched with each other, the middle part of the connecting shaft 3 is rotatably installed on a fixed base 5 through at least two bearings 51, one end of the fixed base 5 is connected with a feeding cylinder 6, the inside of the feeding cylinder 6 near one end of the fixed base 5 is provided with a sealing assembly 7, the other end of the connecting shaft 3 penetrates through the sealing assembly 7 and is eccentrically connected with the first end part 81 of an integrated connecting rod 8 arranged in the feeding cylinder 6, the other end of the feeding cylinder 6 is connected with the stator 41, so that the feeding cavity 61 in the feeding cylinder 6 is in communication with the discharging flow channel formed between the stator 41 and the rotor 42;

[0023] The food material (such as butter, milk, etc.) with fluidity is sent into the feeding cavity in the feeding cylinder through the external material conveying mechanism, and then the material is outputted outward from the discharge flow channel formed between the stator and the rotor through the eccentric rotation of the rotor;

[0024] Because the transported material is food material, the feeding cylinder and the parts in the feeding cylinder contacting with the food material need to be cleaned frequently, and the feeding cylinder and the parts in the feeding cylinder contacting with the food material need to be made of food-grade material and easy to clean. Based on the above requirements, the overall structure is designed as a three-section detachable structure of the feeding cylinder, the stator and the fixed seat, so that the feeding cylinder, the parts in the feeding cylinder and the stator and the rotor can be cleaned frequently to avoid the deterioration of the residual food material in the feeding cylinder.

[0025] The second end 82 of the integral connecting rod 8 is eccentrically connected to one end of the rotor 42 penetrating into the feeding cavity 61, and the ratio of the outer diameter to the length of the body part 83 of the integral connecting rod 8 between the first end 81 and the second end 82 is 1:50. The eccentric driving of the rotor is realized by the flexibility of the slender integral connecting rod, which meets the requirements of the screw pump and makes the material of the connecting rod meet the requirements of food-grade material to reduce the cost, and also ensures that the internal parts of the feeding cylinder are simple in structure and easy to clean, avoiding the food safety hidden danger caused by the accumulation of residual material.

[0026] The integral connecting rod 8 is a stainless steel connecting rod; the output shaft of the speed reducer 2 and the connecting shaft 3 are connected through a coupling 12; the coupling 12, the output shaft of the speed reducer 2 and the connecting shaft 3 are connected through key groove matching.

[0027] A spacer ring 52 is arranged between the two bearings 51 spaced along the axial direction of the connecting shaft 3; a sealing ring 13 is arranged on the fixed seat 5 and located on both sides of the bearing 51.

[0028] The motor 1 and the speed reducer 2 are installed on a base plate 15 through a first bracket 141, and the end of the fixed seat 5 close to the speed reducer 2 is installed on the base plate 15 through a second bracket 142.

[0029] When the above-mentioned eccentric screw pump is used, it can realize the quick disassembly of the feeding cylinder, the stator and the rotor, so as to facilitate the frequent cleaning and avoid the deterioration of the residual food material in the feeding cylinder, and can meet the requirements of food-grade material selection and simple structure of the feeding cylinder on the basis of meeting the eccentric connection.

[0030] The above examples are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. An eccentric screw pump comprising: Motor (1), and the output shaft of motor (1) is connected with speed reducer (2), one end of connecting shaft (3) is connected with the output shaft of speed reducer (2), and the stator (41) and the rotor (42) are matched, characterized by: the middle part of the connecting shaft (3) is rotatably installed on a fixed seat (5) through at least two bearings (51), one end of the fixed seat (5) is connected with a feeding cylinder (6) away from the speed reducer (2), the inside of the feeding cylinder (6) near one end of the fixed seat (5) is provided with a sealing assembly (7), the other end of the connecting shaft (3) passes through the sealing assembly (7) and is eccentrically connected with the first end (81) of the integral connecting rod (8) arranged in the feeding cylinder (6), the other end of the feeding cylinder (6) is connected with the stator (41), so that the feeding cavity (61) in the feeding cylinder (6) is communicated with the discharging flow channel formed between the stator (41) and the rotor (42), the second end (82) of the integral connecting rod (8) is eccentrically connected with one end of the rotor (42) penetrating into the feeding cavity (61), the ratio of the outer diameter to the length of the body part (83) of the integral connecting rod (8) between the first end (81) and the second end (82) of the integral connecting rod (8) is 1:20-60.

2. The eccentric screw pump according to claim 1, characterized in that The body part (411) of the stator (41) is provided with a shell part (412) outside, and the shell part (412) of the stator (41) is connected with the feeding cylinder (6) in sleeve connection.

3. The eccentric screw pump according to claim 1, characterized in that: The sealing assembly (7) is arranged at the connection between the feeding cylinder (6) and the fixed seat (5).

4. The eccentric screw pump according to claim 1, characterized in that: The integral connecting rod (8) is a stainless steel connecting rod.

5. The eccentric screw pump according to claim 4, characterized in that: The integral connecting rod (8) is a 316 stainless steel connecting rod.

6. The eccentric screw pump according to claim 1, characterized in that: The output shaft of the speed reducer (2) is connected with the connecting shaft (3) through a shaft coupling (12).

7. The eccentric screw pump according to claim 6, characterized in that: The shaft coupling (12) is connected with the output shaft of the speed reducer (2) and the connecting shaft (3) through key groove cooperation.

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