Spiral conveying pump

Abstract

The utility model discloses a spiral conveying pump, and relates to the field of spiral conveying pumps. According to the scheme, the mixer comprises a body, a feeding hopper is fixed to one end of the body, and a mixing chamber is fixed to the other end of the body; the two ends of the variable-pitch screw are rotationally connected with the body, and the screw pitch of screw blades on the outer surface of the variable-pitch screw is gradually decreased from the feeding hopper to the mixing chamber; the gravity flap valve is rotationally connected with the body, the mixing chamber is communicated with the body, and the gravity flap valve is used for sealing the communication position of the body and the mixing chamber; the nozzle is fixed to the joint of the body and the mixing chamber and used for spraying air into the mixing chamber. The variable-pitch screw design is adopted, namely, the screw pitch of a screw blade on the outer surface of the variable-pitch screw is gradually decreased from the feeding hopper to the mixing chamber, powder is evenly extruded into the mixing chamber under extrusion and pushing of the variable-pitch screw, and gas and materials are prevented from flowing back.

Description

Technical Field

[0001] The utility model relates to the field of screw conveying pumps, in particular to a screw conveying pump. Background Art

[0002] The screw conveying pump is a feeding equipment, mainly used to convey cement, raw materials, fly ash and other powdered materials;

[0003] For example, a screw conveying pump disclosed in publication number CN214059196U; and a Venturi screw pneumatic conveying pump disclosed in publication number CN104512729A, comprising a hopper, a motor, a high-speed screw, a mixing chamber, an air source interface, a Venturi tube, a concentric annular gap nozzle, and a screw housing, characterized in that the Venturi screw pneumatic conveying pump allows the material to fall into the high-speed screw through the hopper and be quickly sent to the mixing chamber at the front end of the conveying pump, where the material is entrained in the air flow through the Venturi tube;

[0004] At present, screw conveying pumps use a spiral structure to push the material into the mixing chamber, and then use airflow to quickly discharge it. However, the pitch of the spiral blades in the spiral structure of the current screw conveying pump is equidistant, and the extrusion force on the material from one end of the spiral to the other end of the spiral is the same. When the airflow drives the material through the mixing chamber, it will cause some gas and material to flow back. Utility Model Content

[0005] (I) Purpose of the utility model

[0006] In view of this, the purpose of the utility model is to provide a screw conveying pump to prevent gas material from flowing back and ensure the continuity of powder material conveying.

[0007] (II) Technical solution

[0008] In order to achieve the above technical purpose, the utility model provides a screw conveying pump:

[0009] It includes: a main body, with a feed hopper fixed at one end and a mixing chamber fixed at the other end; a variable pitch screw, both ends of which are rotatably connected to the main body, and the pitch of the spiral blades on the outer surface of the variable pitch screw changes gradually from the feed hopper to the mixing chamber; a gravity flap valve, which is rotatably connected to the main body, the mixing chamber is connected to the main body, and the gravity flap valve is used to close the connection between the main body and the mixing chamber; a nozzle is fixed at the junction of the main body and the mixing chamber, and is used to spray air into the mixing chamber.

[0010] Preferably, both ends of the variable pitch spiral are rotatably sealed with dynamic sealing rings, and the dynamic sealing rings are fixed inside the body.

[0011] Preferably, the feed hopper is in communication with the main body and is used for guiding material into the main body.

[0012] Preferably, an air inlet pipe is fixed to the outer surface of the body, and the air inlet pipe is connected to the nozzle.

[0013] Preferably, the gravity flap valve comprises a closing door and a counterweight arm fixedly connected to a side surface of the closing door, through holes are evenly formed on an outer surface of the counterweight arm, and a counterweight block is fixed in the through hole by bolts.

[0014] Preferably, an end of the mixing chamber away from the main body is provided with a discharge port for discharging materials.

[0015] Preferably, an inspection window is provided on the outer surface of the body, and an inspection cover plate for closing the inspection window is fixed on the outer surface of the body.

[0016] It can be seen from the above technical solutions that the present application has the following beneficial effects:

[0017] 1: The variable spiral design is adopted, that is, the pitch of the spiral blades on the outer surface of the variable pitch spiral changes gradually from the feed hopper to the mixing chamber. Under the extrusion and push of the variable pitch spiral, the powder is evenly squeezed into the mixing chamber to prevent the backflow of gas and material.

[0018] 2: A gravity flap valve is installed between the main body and the mixing chamber to control the flow rate of the powder. Only when the predetermined flow rate is reached, that is, the pressure applied by the powder to the closed door in the gravity flap valve is greater than the gravity of the counterweight on the gravity flap valve, will the closed door in the gravity flap valve be pushed open to transport the material, thereby ensuring the continuity of material transportation and preventing air flow backflow when the material supply is insufficient or interrupted. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the overall structure of a screw conveying pump provided by the utility model;

[0021] Figure 2 A schematic diagram of the top view of a screw conveying pump provided by the utility model;

[0022] Figure 3 The utility model provides a side view of the partial cross-sectional structure of a screw conveying pump.

[0023] Description of the drawings: 1. Main body; 11. Inspection cover plate; 2. Feed hopper; 3. Variable pitch screw; 4. Dynamic sealing ring; 5. Gravity flap door; 51. Counterweight; 6. Mixing chamber; 61. Discharge port; 7. Nozzle; 71. Inlet pipe. DETAILED DESCRIPTION

[0024] The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, and use. It should be understood that in all of these figures, the same or similar reference numerals indicate the same or similar parts and features. The various drawings only schematically represent the concepts and principles of the embodiments of the present disclosure, and do not necessarily show the specific dimensions and proportions of the various embodiments of the present disclosure. Specific parts in specific drawings may be exaggerated to illustrate the relevant details or structures of the embodiments of the present disclosure.

[0025] Embodiment 1

[0026] See also Figure 1 , Figure 2 and Figure 3 As shown, a screw conveying pump described in this embodiment includes a body 1, a feed hopper 2, a variable pitch screw 3, a mixing chamber 6 and a nozzle 7; the feed hopper 2 is fixed to the upper surface of one end of the body 1, and the feed hopper 2 is communicated with the body 1, and is used to introduce materials into the body 1, such as cement, raw materials, fly ash and other powdery materials; the mixing chamber 6 is fixed to the outer surface of the other end of the body 1, and the mixing chamber 6 is communicated with the body 1, both ends of the variable pitch screw 3 are rotatably connected to the body 1, and the nozzle 7 is fixed at the junction of the body 1 and the mixing chamber 6, and is used to spray air into the mixing chamber 6, and the variable pitch screw 3 rotates to squeeze and push the material into the mixing chamber 6;

[0027] Specifically, Figure 1 As shown, the pitch of the spiral blades on the outer surface of the variable-pitch screw 3 decreases from the feed hopper 2 to the mixing chamber 6. The purpose is that when the material is transported from the feed hopper 2 to the mixing chamber 6 by the spiral blades, the material will be squeezed, so that the material is transported to the mixing chamber 6 more compactly, thereby avoiding the backflow of the material due to the influence of the air pressure in the mixing chamber 6.

[0028] Further, such as Figure 1 As shown, both ends of the variable pitch screw 3 are rotatably sealed with dynamic sealing rings 4, and the dynamic sealing ring 4 is fixed inside the body 1 to ensure the sealing between the variable pitch screw 3 and the body 1.

[0029] like Figure 2 and Figure 3 As shown, an air inlet pipe 71 is fixed on the outer surface of the body 1, and the air inlet pipe 71 is connected to the nozzle 7. The air inlet pipe 71 is used to connect to an external air pump or blower to supply air to the air inlet pipe 71;

[0030] like Figure 2As shown, a discharge port 61 for discharging materials is provided at the end of the mixing chamber 6 away from the main body 1. When this embodiment is put into use, the discharge port 61 is connected to a device for receiving materials, and the mixing chamber 6 is funnel-shaped, which can accelerate the discharge of materials in the mixing chamber 6. In this embodiment, the variable pitch screw 3 is linked to an external motor, and the variable pitch screw 3 is driven to rotate by the external motor.

[0031] Embodiment 2

[0032] See also Figure 2 and Figure 3 As shown, based on the above embodiment, the improvement of this embodiment is that, in order to further avoid material backflow and include the continuity of material transportation, a gravity flap valve 5 is rotatably connected between the body 1 and the mixing chamber 6 to control the flow rate of the powder. Only when the predetermined flow rate is reached, that is, the pressure applied by the powder to the closed door in the gravity flap valve 5 is greater than the gravity of the counterweight block 51 on the gravity flap valve 5, the closed door in the gravity flap valve 5 will be pushed open to transport the material, thereby ensuring the continuity of material transportation and preventing the phenomenon of airflow backflow when the material is insufficient or interrupted.

[0033] Specifically, the gravity flap door 5 includes a closed door and a counterweight arm fixedly connected to the side of the closed door, the counterweight arm is coaxially connected to the closed door and rotatably connected to the main body 1, the outer surface of the counterweight arm is evenly provided with through holes, and a counterweight block 51 is fixed in the through hole by bolts. The counterweight block 51 is provided with at least one, and the counterweight block 51, the counterweight arm and the closed door form a lever structure with the axis connecting the counterweight arm and the closed door as the fulcrum. If the counterweight block 51 is connected and fixed to the through holes in different positions, the balance between the counterweight arm and the closed door can be adjusted, and technical personnel in this field can make adjustments according to actual needs.

[0034] Embodiment 3

[0035] like Figure 1 As shown, based on the above embodiment, an inspection window is opened on the outer surface of the main body 1, and an inspection cover 11 for closing the inspection window is fixed on the outer surface of the main body 1. The inspection cover 11 can be fixedly connected to the main body 1 by a connecting structure such as bolts or locks, and no specific limitation is made here. By removing the inspection cover 11, the variable pitch screw 3 can be conveniently inspected through the inspection window.

[0036] The exemplary implementation scheme of the present disclosure is described in detail above with reference to the preferred embodiments. However, it can be understood by those skilled in the art that, without departing from the concept of the present disclosure, various modifications and variations can be made to the above-mentioned specific embodiments, and various technical features and structures proposed in the present disclosure can be combined in various ways without exceeding the protection scope of the present disclosure, which is determined by the attached claims.

Claims

1. A screw conveying pump, characterized in that: include: A main body (1) is provided with a feed hopper (2) fixed at one end and a mixing chamber (6) fixed at the other end; A variable pitch screw (3), both ends of which are rotatably connected to the body (1), and the pitch of the spiral blades on the outer surface of the variable pitch screw (3) decreases from the feed hopper (2) to the mixing chamber (6); A gravity flap valve (5) is rotatably connected to the body (1), the mixing chamber (6) is in communication with the body (1), and the gravity flap valve (5) is used to close the connection between the body (1) and the mixing chamber (6); The nozzle (7) is fixed at the junction of the main body (1) and the mixing chamber (6) and is used to spray air into the mixing chamber (6).

2. A screw conveying pump according to claim 1, characterized in that: Both ends of the variable pitch spiral (3) are rotatably sealed and connected to dynamic sealing rings (4), and the dynamic sealing rings (4) are fixed inside the body (1).

3. A screw conveying pump according to claim 1, characterized in that: The feed hopper (2) is in communication with the main body (1) and is used for guiding materials into the main body (1).

4. A screw conveying pump according to claim 1, characterized in that: An air intake pipe (71) is fixed on the outer surface of the body (1), and the air intake pipe (71) is connected to the nozzle (7).

5. A screw conveying pump according to claim 1, characterized in that: The gravity flap valve (5) comprises a closed door and a counterweight arm fixedly connected to the side of the closed door, the outer surface of the counterweight arm is evenly provided with through holes, and a counterweight block (51) is fixed in the through hole by bolts.

6. A screw conveying pump according to claim 1, characterized in that: The end of the mixing chamber (6) away from the main body (1) is provided with a discharge port (61) for discharging materials.

7. A screw conveying pump according to claim 1, characterized in that: An inspection window is provided on the outer surface of the body (1), and an inspection cover plate (11) for closing the inspection window is fixed on the outer surface of the body (1).

Images