Slurry pump capable of automatically cleaning slurry in volute cavity

Abstract

The utility model provides a slurry pump capable of automatically cleaning slurry in a volute cavity, which comprises a slurry pump main body, a main liquid inlet pipe connected to the slurry pump main body, a main liquid outlet pipe, a high-pressure gas inlet mechanism communicated with the main liquid inlet pipe, and a slurry-high-pressure gas discharge mechanism communicated with the main liquid outlet pipe, an air inlet of the high-pressure air inlet pipe is connected with an external high-pressure air source, the slurry-high-pressure air discharging mechanism comprises a slurry-high-pressure air discharging pipe, an inlet of the slurry-high-pressure air discharging pipe is formed in the lower end of the main liquid outlet pipe, and an outlet of the slurry-high-pressure air discharging pipe faces downwards and points to the outside. According to the technical scheme, the situation that the interior of the volute in the slurry pump body is frozen in the low-temperature environment and consequently the volute cracks can be effectively avoided, and it is guaranteed that the slurry pump body is smoothly restarted in the low-temperature environment. The technical scheme provided by the utility model is simple in structure, low in cost, good in effect and suitable for being widely popularized and applied to the slurry pump.

Description

Technical Field

[0001] The utility model belongs to the technical field of improvement of slurry pumps, and relates to a slurry pump capable of cleaning slurry in a volute cavity, in particular to a slurry pump capable of self-cleaning slurry in a volute cavity. Background Art

[0002] Slurry pump is a kind of machine that uses the centrifugal force generated by the rotation of the impeller in the pump body to increase the energy of the solid-liquid mixed medium and discharge it through the pipeline. It is mainly used in mining, power plants, dredging, metallurgy, chemical industry, building materials and petroleum industries. Figure 2 As shown in the figure, the solid-liquid mixed medium (i.e. slurry) is thrown from the center of the impeller to the external source under the action of centrifugal force and gains energy, then leaves from the outer edge of the impeller at high speed and enters the volute pump housing. In the volute pump housing, the liquid slows down due to the gradual expansion of the flow channel, converts part of the kinetic energy into static pressure energy, and finally flows into the discharge pipe at a higher pressure, thereby being transferred to the required place. When the solid-liquid mixed medium flows from the center of the impeller to the outer edge of the impeller, a certain vacuum will be formed in the center of the impeller, and the pressure above the liquid surface of the storage tank will be greater than the pressure at the inlet of the slurry pump, so the liquid can be continuously pressed into the impeller.

[0003] After the existing slurry pump is shut down after use, some slurry will remain in the volute. Since the impeller stops rotating, this part of the slurry cannot be discharged from the volute. When the environment around the volute pump is lower than 0℃, the slurry retained in it will freeze together with the impeller, making it difficult to restart the slurry pump. When the freezing is severe, the volute may even crack and be damaged, posing a great threat to the normal operation of the equipment. Therefore, it is necessary to provide a slurry pump that can be smoothly restarted in a low temperature environment (hereinafter referred to as temperature <0℃). Utility Model Content

[0004] The utility model aims to provide a slurry pump with a self-cleaning volute chamber slurry, so as to solve the technical problems in the prior art that the slurry cannot be discharged after the slurry pump is shut down after use, and freezes together with the impeller in a low temperature environment, making it difficult to start and restart the slurry pump, and even causing the volute to freeze and crack and be damaged.

[0005] To achieve the above purpose, the specific technical solution of the utility model is as follows:

[0006] A slurry pump for self-cleaning volute chamber slurry, comprising a slurry pump body, a main liquid inlet pipe and a main liquid outlet pipe connected to the slurry pump body, a high-pressure air intake mechanism connected to the main liquid inlet pipe, and a slurry-high-pressure gas discharge mechanism connected to the main liquid outlet pipe, the high-pressure air intake mechanism comprising a high-pressure air inlet pipe, the air inlet of the high-pressure air inlet pipe being connected to an external high-pressure gas source, the slurry-high-pressure gas discharge mechanism comprising a slurry-high-pressure gas discharge pipe, the inlet of the slurry-high-pressure gas discharge pipe being arranged at the lower end of the main liquid outlet pipe, and the outlet being downward and pointing to the outside.

[0007] The main liquid inlet pipe is provided with a control valve A for controlling the on-off of the main liquid inlet pipe, and the control valve A is located in front of the connection port between the high-pressure air inlet pipe and the main liquid inlet pipe.

[0008] The high-pressure air intake pipe is provided with a control valve B for controlling the on-off of the high-pressure air intake pipe.

[0009] The slurry-high pressure gas discharge pipe is provided with a control valve C for controlling the on-off of the slurry-high pressure gas discharge pipe.

[0010] The axis of the slurry-high-pressure gas discharge pipe and the axis of the main liquid outlet pipe are located in the same vertical plane.

[0011] The slurry-high pressure gas discharge pipe is arranged obliquely in the vertical plane where it is located.

[0012] The control valve A is a knife gate valve.

[0013] The beneficial effect of the utility model is that the utility model provides a slurry pump with a self-cleaning volute chamber slurry. After the slurry pump body is shut down, the control valve A is closed, the control valve B and the control valve C are opened, and high-pressure air is injected into the slurry pump body by using the high-pressure air inlet pipe. The high-pressure airflow can effectively drive the slurry accumulated at the bottom of the volute to flow with the gas, and then all the slurry accumulated at the bottom of the volute is discharged through the slurry-high-pressure air discharge pipe, thereby achieving zero accumulation of slurry in the slurry pump body, thereby effectively preventing the volute inside the slurry pump body from freezing and cracking in a low-temperature environment, and ensuring that the slurry pump body can be smoothly restarted in a low-temperature environment.

[0014] The technical solution provided by the utility model utilizes a simple structure to solve the technical problem of difficulty in restarting the existing slurry pump in a low-temperature environment. It has low cost and good effect, and is suitable for wide promotion and application on slurry pumps. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] Figure 2 It is a schematic diagram of the internal structure of a slurry pump in the prior art.

[0017] Markings in the figure: 1. Slurry pump body, 2. Main liquid inlet pipe, 3. Main liquid outlet pipe, 4. High-pressure air inlet pipe, 5. Slurry-high-pressure air discharge pipe, 6. Control valve A, 7. Control valve B, 8. Control valve C. DETAILED DESCRIPTION

[0018] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0019] like Figure 1 As shown, the utility model provides a slurry pump for self-cleaning volute chamber slurry, which includes a slurry pump body 1 for discharging slurry to a discharge pipe, a main liquid inlet pipe 2 connected to the slurry pump body 1 and used to draw slurry in a storage tank into the slurry pump body 1, and a main liquid outlet pipe 3 for discharging slurry from the slurry pump body 1 to a designated discharge pipe, as well as a high-pressure air intake mechanism connected to the main liquid inlet pipe 2, and a slurry-high-pressure gas discharge mechanism connected to the main liquid outlet pipe 3, wherein the high-pressure air intake mechanism is used to introduce high-pressure air into the slurry pump body 1 after the slurry pump body 1 is shut down, so as to drive the slurry remaining in its volute to mix with the high-pressure airflow and flow from the volute to the main liquid outlet pipe 3, and the slurry-high-pressure gas discharge mechanism is used to discharge the slurry mixed with the high-pressure airflow from the slurry pump body 1. In the process of discharging the residual slurry, in order to ensure that there is only one passage of high-pressure air intake mechanism-slurry pump body 1-slurry-high-pressure air discharge mechanism to ensure the smooth discharge of the slurry in the volute, in this embodiment, a control valve A6 for controlling the on-off of the main liquid inlet pipe 2 is provided on the main liquid inlet pipe 2, wherein the control valve A6 is located in front of the connection port between the high-pressure air intake mechanism and the main liquid inlet pipe 2. There are many types of control valves A6 to choose from. In this embodiment, a knife gate valve is selected.

[0020] Specifically, the high-pressure air intake mechanism in this embodiment includes a high-pressure air intake pipe 4, the air inlet of the high-pressure air intake pipe 4 is connected to an external high-pressure air source, and the air outlet is connected to the main liquid inlet. Preferably, the pressure range of the high-pressure air source in this embodiment is 0.6 to 0.8 MPa, and in order to facilitate the control of the on and off of the injection of high-pressure air, a control valve B7 is provided between the air inlet and the air outlet of the high-pressure air intake pipe 4;

[0021] The slurry-high-pressure gas discharge mechanism includes a slurry-high-pressure gas discharge pipe 5, the inlet of which is arranged at the lower end of the main liquid outlet pipe 3, and the outlet is downward and points to the outside. In order to facilitate the control of the slurry to be discharged from the slurry-high-pressure gas discharge pipe 5 or the main liquid outlet pipe 3, in this embodiment, a control valve C8 is arranged on the slurry-high-pressure gas discharge pipe 5.

[0022] Furthermore, in order to smoothly discharge the residual slurry in the slurry pump body 1, in this embodiment, the axis of the slurry-high-pressure gas discharge pipe 5 is arranged to be located in the same vertical plane as the axis of the main liquid outlet pipe 3, and it is inclined in the vertical plane.

[0023] In this embodiment, the working process of discharging the residual slurry is as follows:

[0024] A. After the slurry pump body 1 stops working, close the control valve A6;

[0025] B. Open the high-pressure gas source, open the control valve B7 on the high-pressure gas inlet pipe 4 and the control valve C8 on the slurry-high-pressure gas outlet pipe 5;

[0026] C, waiting for the airflow to drive the remaining slurry to be discharged from the volute cavity of the slurry pump body 1;

[0027] D. Close the high-pressure gas source and control valves B7 and C8. Before restarting the slurry pump body 1, open the control valve A6 to restore the passage of the main pipeline.

[0028] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A slurry pump for self-cleaning volute chamber slurry, characterized in that: It comprises a slurry pump body (1), a main liquid inlet pipe (2) and a main liquid outlet pipe (3) connected to the slurry pump body (1), a high-pressure air intake mechanism connected to the main liquid inlet pipe (2), and a slurry-high-pressure gas discharge mechanism connected to the main liquid outlet pipe (3), wherein the high-pressure air intake mechanism comprises a high-pressure air intake pipe (4), the air inlet of the high-pressure air intake pipe (4) is connected to an external high-pressure gas source, and the slurry-high-pressure gas discharge mechanism comprises a slurry-high-pressure gas discharge pipe (5), the inlet of the slurry-high-pressure gas discharge pipe (5) is arranged at the lower end of the main liquid outlet pipe (3), and the outlet is downward and points to the outside.

2. A slurry pump for self-cleaning volute chamber slurry according to claim 1, characterized in that: The main liquid inlet pipe (2) is provided with a control valve A (6) for controlling the on and off of the main liquid inlet pipe (2), and the control valve A (6) is located in front of the connection port between the high-pressure air inlet pipe (4) and the main liquid inlet pipe (2).

3. A slurry pump for self-cleaning volute chamber slurry according to claim 1, characterized in that: The high-pressure air intake pipe (4) is provided with a control valve B (7) for controlling the on-off of the high-pressure air intake pipe (4).

4. A slurry pump for self-cleaning volute chamber slurry according to claim 1, characterized in that: The slurry-high-pressure gas discharge pipe (5) is provided with a control valve C (8) for controlling the on-off of the slurry-high-pressure gas discharge pipe (5).

5. A slurry pump for self-cleaning volute chamber slurry according to claim 1, characterized in that: The axis of the slurry-high-pressure gas discharge pipe (5) and the axis of the main liquid outlet pipe (3) are located in the same vertical plane.

6. A slurry pump for self-cleaning volute chamber slurry according to claim 5, characterized in that: The slurry-high pressure gas discharge pipe (5) is arranged tilted in the vertical plane where it is located.

7. A slurry pump for self-cleaning volute chamber slurry according to claim 2, characterized in that: The control valve A (6) is a knife gate valve.

Images