Novel submersible sewage pump shaft seal device

Abstract

The utility model relates to the technical field of sewage treatment, in particular to a novel submersible sewage pump shaft seal device which comprises a pump body rotating shaft, a shaft seal mechanism is arranged on the outer side of the pump body rotating shaft, the shaft seal mechanism comprises a shaft seal base, an elastic diaphragm is fixedly connected to the outer side end of the shaft seal base, a plurality of diaphragm holes are formed in the shaft seal base, and the diaphragm holes are communicated with the shaft seal base. A guide cavity is formed in the middle of the interior of the shaft seal base, through work of the shaft seal mechanism, when the density of liquid on the outer side is increased and the liquid is very sticky, the elastic diaphragm deforms through the change of the pressure intensity, then the bottom end shaft seal rubber sleeve deforms through the internal pressure intensity, and then the shaft seal rubber sleeve is changed into a U shape from an original V-shaped section; on the basis of the original sealing function, the friction force can be increased, the speed of the rotating shaft is reduced, the flow speed of sewage is reduced, the staying time of liquid in a pipeline is prolonged, the situation that sticky liquid adheres to the wall of the pipeline is reduced, and the suction efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a novel shaft sealing device for a submersible sewage pump. Background Art

[0002] Submersible sewage pump is a submersible sewage pump, which is particularly suitable for conveying liquids containing hard solids, fibers, and particularly dirty, sticky, and slippery liquids. Dirty, sticky, and slippery liquids are very easy to stick to the water pump pipe during flow. The existing technology generally uses the frequency converter to reduce the speed to reduce the water pump suction speed, so that the liquid stays in the pipe for a longer time, which helps to reduce the adhesion of viscous liquid to the pipe wall, thereby improving the suction efficiency. However, this method has high energy consumption and high cost, and wastes the resources of the sewage treatment plant in actual application. At the same time, during maintenance in water, due to the tight fit of structures such as the shaft seal rubber, the sludge accumulated on the outer wall of the rotating shaft and the shaft seal position is not easy to clean, which brings considerable difficulties to maintenance.

[0003] In order to solve the above problems, a new submersible sewage pump shaft sealing device is proposed. Utility Model Content

[0004] The utility model aims to provide a novel shaft seal device for a submersible sewage pump to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a novel submersible sewage pump shaft sealing device, comprising a pump body shaft, wherein a shaft sealing mechanism is arranged on the outer side of the pump body shaft.

[0006] Preferably, the shaft sealing mechanism includes a shaft sealing base, an elastic diaphragm is fixedly connected to the outer end of the shaft sealing base, a plurality of diaphragm holes are opened inside the shaft sealing base, a guide cavity is opened at the middle position inside the shaft sealing base, a plurality of shaft sealing holes are opened at the bottom end of the guide cavity, and a shaft sealing rubber sleeve is fixedly connected to the bottom end of the shaft sealing base.

[0007] Preferably, the top end of the shaft sealing mechanism is fixedly connected to a control mechanism, the control mechanism includes a pressure controller, the bottom end of the pressure controller is fixedly connected to a pressure guiding tube, and the bottom end of the pressure guiding tube is fixedly connected to the top side wall of the guide cavity.

[0008] Preferably, the outer end of the shaft sealing mechanism is fixedly connected to a shell, and the outer wall of the shell is arc-shaped.

[0009] Preferably, a sealing leather cup is fixedly connected to the inner end of the shaft sealing mechanism, and the sealing leather cup is in the shape of a leather cup. A sealed space is formed between the inner side of the sealing leather cup and the shaft sealing rubber sleeve, and lubricating liquid is injected into the interior.

[0010] Preferably, a controller is disposed inside the pressure controller.

[0011] Preferably, the shaft seal rubber sleeve is a wear-resistant elastic sealing material, and its cross-section is V-shaped when no external force is applied, and gradually becomes U-shaped as the internal pressure increases.

[0012] Beneficial effects of the utility model:

[0013] 1. The utility model works through the shaft sealing mechanism. When the density of the outer liquid increases and becomes very viscous, the elastic diaphragm is deformed by utilizing the change in pressure, and then the internal pressure causes the bottom shaft sealing rubber sleeve to deform, thereby changing the shaft sealing rubber sleeve from the original V-shaped cross-section to a U-shaped cross-section. Therefore, on the basis of the original sealing function, the friction force can be increased, thereby reducing the shaft speed, thereby reducing the sewage flow rate, thereby increasing the residence time of the liquid in the pipeline, helping to reduce the adhesion of the viscous liquid to the pipeline wall, thereby improving the suction efficiency. In addition, a slower water pump speed can also reduce the turbulence of the liquid in the pipeline, reduce the resistance of the liquid, and is conducive to the suction of the viscous liquid. The sealing cavity formed in cooperation with the sealing leather cup can be injected with lubricating liquid, thereby increasing the lubrication effect.

[0014] 2. The utility model forms a suction force through negative pressure during maintenance and cleaning through the control mechanism, thereby reducing the internal pressure of the shaft sealing mechanism, thereby slightly shrinking the V-shaped cross-section of the shaft sealing rubber sleeve. Under the premise of ensuring sealing, the width of the gap between the shaft sealing rubber sleeve and the pump body shaft is increased, thereby reducing the difficulty of the maintenance and cleaning process, making maintenance and cleaning smoother and avoiding residual sludge in the gap that affects use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the present invention or 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 for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 This is a three-dimensional structural diagram of a shaft sealing mechanism of a new type of submersible sewage pump shaft sealing device according to an embodiment of the utility model;

[0017] Figure 2 A new type of submersible sewage pump shaft seal device is provided in the embodiment of the utility model Figure 1 A is a partial enlarged view of the middle;

[0018] Figure 3 It is a side cross-sectional view of a novel submersible sewage pump shaft seal device according to an embodiment of the utility model;

[0019] Figure 4 A new type of submersible sewage pump shaft seal device is provided in the embodiment of the utility model Figure 3 The local enlarged picture of the middle B;

[0020] Figure 5 This is a three-dimensional structural diagram of the overall appearance of a new submersible sewage pump shaft seal device according to an embodiment of the utility model;

[0021] Markings in the figure are: 1. Pump body shaft; 2. Shaft sealing mechanism; 201. Shaft sealing base; 202. Elastic diaphragm; 203. Diaphragm hole; 204. Guide cavity; 205. Shaft sealing hole; 206. Shaft sealing rubber sleeve; 3. Control mechanism; 301. Pressure controller; 302. Pressure guiding pipe; 4. Outer shell; 5. Sealing leather cup. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0023] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0024] like Figures 1 to 5 As shown, a specific embodiment of the utility model provides a new type of submersible sewage pump shaft sealing device, including a pump body shaft 1, a shaft sealing mechanism 2 is arranged on the outside of the pump body shaft 1, and the outer end of the shaft sealing mechanism 2 is fixedly connected to a shell 4, and the outer wall of the shell 4 is arc-shaped. In the utility model, the pump body shaft 1 is generally located at the bottom end, the top end of the pump body shaft 1 is fixedly connected to the pump body output end, the bottom end of the pump body shaft 1 is fixedly connected to a pump wheel, the shaft sealing mechanism 2 is slidably connected to the middle position, and the outer side is the shell 4. When the submersible sewage pump is working in clean water, the shaft sealing base 201, the elastic diaphragm 202 and the shaft sealing rubber sleeve 206 together form a sealed chamber, and the pressure in the chamber can be adjusted to the same internal pressure as the clean water pressure, so that the elastic diaphragm 202 will not be deformed in the clean water, and the shaft sealing rubber sleeve 206 will not be deformed, and the cross-section of the shaft sealing rubber sleeve 206 is a V-shape, and the contact area between the V-shape and the pump body shaft 1 is extremely small, which can reduce friction while providing sealing effect.

[0025] like Figures 1 to 5 As shown, the shaft sealing mechanism 2 includes a shaft sealing base 201, an elastic diaphragm 202 is fixedly connected to the outer end of the shaft sealing base 201, a plurality of diaphragm holes 203 are opened inside the shaft sealing base 201, a guide cavity 204 is opened at the middle position inside the shaft sealing base 201, a plurality of shaft sealing holes 205 are opened at the bottom end of the guide cavity 204, and a shaft sealing rubber sleeve 206 is fixedly connected to the bottom end of the shaft sealing base 201. When the liquid outside the submersible sewage pump is sewage, especially viscous sewage, since the internal pressure of the liquid is positively correlated with the density of the liquid, the liquid pressure outside the elastic diaphragm 202 increases at this time, and then the elastic diaphragm 202 is deformed and recessed inward, and then the elastic diaphragm 202 guides the internal pressure to the bottom shaft sealing rubber sleeve 206 through the diaphragm hole 203, the guide cavity 204 and the shaft sealing hole 205.

[0026] like Figure 1 , Figure 2 and Figure 4 As shown, the shaft seal rubber sleeve 206 is an elastic sealing material. When no external force is applied, its cross-section is V-shaped, and it gradually becomes U-shaped as the internal pressure increases. Due to the increase in pressure, the bottom shaft seal rubber sleeve 206 is deformed outward, and its cross-section is U-shaped. As the inner pressure increases and the contact area between the U-shaped cross-section and the pump body shaft 1 increases, the friction between the shaft seal rubber sleeve 206 and the pump body shaft 1 is increased, thereby reducing the speed of the pump body shaft 1, thereby increasing the residence time of the liquid in the pipeline, helping to reduce the adhesion of viscous liquid to the pipeline wall, thereby improving the suction efficiency. In addition, a slower water pump speed can also reduce the turbulence of the liquid in the pipeline, reduce the resistance of the liquid, and is conducive to the suction of viscous liquids. Figure 4 As shown, the inner end of the shaft sealing mechanism 2 is fixedly connected with a sealing leather cup 5, and the sealing leather cup 5 is in the shape of a leather cup. During the rotation process, a sealing cavity is also formed between the sealing leather cup 5 and the shaft sealing rubber sleeve 206. The inside of the wall can be filled with lubricating liquid to increase the lubrication effect between the shaft sealing rubber sleeve 206 and the pump body shaft 1. At the same time, the sealing leather cup 5 can also play a sealing role.

[0027] like Figure 1 and Figure 4As shown, the top of the shaft sealing mechanism 2 is fixedly connected to a control mechanism 3, and the control mechanism 3 includes a pressure controller 301. The bottom of the pressure controller 301 is fixedly connected to a pressure guiding tube 302, and the bottom of the pressure guiding tube 302 is fixedly connected to the top side wall of the guide cavity 204. A controller is arranged inside the pressure controller 301. When the shaft sealing device needs to be maintained and cleaned on the outside, the sewage suction work can be stopped, and then the internal controller of the control mechanism 3 is controlled by the switch, so that the pressure controller 301 provides a suction force to reduce the pressure in the internal cavity of the shaft sealing mechanism 2, so that the shaft sealing rubber sleeve 206 shrinks into an inward V-shape. At this time, the gap between the shaft sealing rubber sleeve 206 and the pump body shaft 1 becomes larger, which can provide a larger space during the cleaning process of the staff, making the cleaning and maintenance more convenient.

[0028] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0029] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A novel shaft seal device for a submersible sewage pump, comprising a pump body shaft (1), characterized in that: A shaft sealing mechanism (2) is arranged on the outer side of the pump body rotating shaft (1); The shaft sealing mechanism (2) comprises a shaft sealing base (201), an outer end of the shaft sealing base (201) is fixedly connected to an elastic diaphragm (202), a plurality of diaphragm holes (203) are provided inside the shaft sealing base (201), a guide cavity (204) is provided at a middle position inside the shaft sealing base (201), a plurality of shaft sealing holes (205) are provided at a bottom end of the guide cavity (204), and a shaft sealing rubber sleeve (206) is fixedly connected to the bottom end of the shaft sealing base (201).

2. A novel submersible sewage pump shaft seal device according to claim 1, characterized in that: The top end of the shaft sealing mechanism (2) is fixedly connected to a control mechanism (3), the control mechanism (3) comprises a pressure controller (301), the bottom end of the pressure controller (301) is fixedly connected to a pressure guiding tube (302), and the bottom end of the pressure guiding tube (302) is fixedly connected to the top side wall of the guide cavity (204).

3. A new type of submersible sewage pump shaft seal device according to claim 1, characterized in that: The outer end of the shaft sealing mechanism (2) is fixedly connected to a housing (4), and the outer wall of the housing (4) is in an arc shape.

4. A novel submersible sewage pump shaft seal device according to claim 1, characterized in that: The inner end of the shaft sealing mechanism (2) is fixedly connected to a sealing leather cup (5), and a sealed space for lubricating liquid is formed between the sealing leather cup (5) and the shaft sealing rubber sleeve (206).

5. A novel submersible sewage pump shaft seal device according to claim 2, characterized in that: The pressure controller (301) is provided with a controller inside.

6. A novel submersible sewage pump shaft seal device according to claim 1, characterized in that: The shaft sealing rubber sleeve (206) is a wear-resistant elastic sealing material, and its cross-section is V-shaped when no external force is applied, and gradually becomes U-shaped as the internal pressure increases.

Images