Submersible sewage pump with double cutting devices

Abstract

The invention discloses a submersible sewage pump with double cutting devices, which is characterized by comprising a pump body, an impeller, a cutter head, a cutter head and a base, wherein a first cutting device is formed between the cutter head and the cutter head, and the first cutting device is a friction pair; a second cutting device is formed between the impeller and the base, and the second cutting device is a cutting pair. The submersible sewage pump is provided with two cutting devices, so that the cutting efficiency is greatly improved, and safe and reliable operation of the submersible sewage pump is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of fluid machinery, and in particular to a submersible sewage pump with a double cutting device. Background Art

[0002] Submersible sewage pumps can tear and cut long fibers, bags, tapes, grass, cloth, etc. in sewage and discharge them smoothly. They are suitable for pumping liquids containing hard solids or fibers, especially dirty, sticky and slippery liquids.

[0003] Existing conventional submersible sewage pumps are equipped with a cutting device (such as a cutter head) at the water inlet to cut debris. However, conventional cutting submersible sewage pumps are often only equipped with one cutting device, the cutting effect is average and the debris cannot be cut repeatedly. The debris may enter the pump body through the gap of the cutter. If the debris accumulates, it will cause the pump body to be blocked, resulting in the submersible sewage pump being unable to be used normally. If the debris cannot be completely cut, it will enter the pump body and hit the impeller blades, which is easy to cause damage to the impeller, and then cause economic losses. Summary of the invention

[0004] The purpose of the present application is to provide a submersible sewage pump with a double cutting device to improve the cutting effect.

[0005] The present application discloses a submersible sewage pump with a double cutting device, comprising: a pump body, an impeller, a cutter disc, a cutter head, and a base; wherein:

[0006] A first cutting device is formed between the cutter disc and the cutter head, and the first cutting device is a friction pair;

[0007] A second cutting device is formed between the impeller and the base, and the second cutting device is a cutting pair.

[0008] In a preferred embodiment, a spiral triangular concave-convex groove is provided on the end surface of the base that cooperates with the impeller blades.

[0009] In a preferred example, the cutter head is configured to rotate with the main shaft, and the cutter disc is fixed on the base.

[0010] In a preferred example, a cutting groove is provided on the cutter disc.

[0011] In a preferred example, the number of the cutting grooves is 4.

[0012] In a preferred embodiment, the cutter head has three cutting edges.

[0013] In a preferred example, the impeller and the base are made of martensitic stainless steel.

[0014] This application has at least the following technical effects:

[0015] The submersible sewage pump of the present application is provided with two cutting devices, which greatly improves the cutting efficiency and ensures the safe and reliable operation of the submersible sewage pump.

[0016] A large number of technical features are recorded in the specification of this application, which are distributed in various technical solutions. If all possible combinations of technical features of this application (i.e., technical solutions) are to be listed, the specification will be too long. In order to avoid this problem, the various technical features disclosed in the above-mentioned invention content of this application, the various technical features disclosed in the various embodiments and examples below, and the various technical features disclosed in the accompanying drawings can be freely combined with each other to form various new technical solutions (these technical solutions are all deemed to have been recorded in this specification), unless the combination of such technical features is technically infeasible. For example, in one example, feature A+B+C is disclosed, and in another example, feature A+B+D+E is disclosed, and features C and D are equivalent technical means that play the same role. Technically, only one can be used, and it is impossible to use them at the same time. Feature E can be combined with feature C technically. Then, the solution of A+B+C+D should not be deemed to have been recorded because it is technically infeasible, and the solution of A+B+C+E should be deemed to have been recorded. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a cross-sectional schematic diagram of a submersible cutting pump according to the present application;

[0018] Figure 2 It is a partial schematic diagram of the cutter head and cutter disc of the submersible cutting pump according to the present application;

[0019] Figure 3 It is a partial schematic diagram of the impeller and base of the submersible cutting pump according to the present application.

[0020] 1- pump body; 2- impeller; 3- blade disc; 4- blade head; 5- base. DETAILED DESCRIPTION

[0021] In the following description, many technical details are provided to help readers better understand the present application. However, those skilled in the art can understand that the technical solution claimed in the present application can be implemented even without these technical details and various changes and modifications based on the following embodiments.

[0022] The structure of the submersible cutting pump of the present application is as follows Figure 1 As shown, it includes: a pump body 1, an impeller 2, a cutter disc 3, a cutter head 4, and a base 5. Among them, the cutter disc 3 and the cutter head 4 are as shown in FIG. Figure 2 As shown, the two form a scissor shape. The cutter disc 3 and the cutter head 4 constitute the first cutting device of the pump. The cutter head rotates with the main shaft, and the cutter disc is fixed on the base. There is a cutting edge on the cutter head and a cutting groove on the cutter disc, and the first cutting is completed by one movement and one stillness.

[0023] In one embodiment, the cutter head 4 has three cutting edges, and in an optional embodiment, the cutter disc 3 has four cutting grooves. The clearance between the two is extremely small, and the cutting efficiency is high.

[0024] Both the cutter disc and the cutter head are made of cemented carbide with extremely high hardness and long service life.

[0025] The impeller 2 and the base 5 are as shown in FIG. Figure 3 As shown, the two constitute a cutting pair, i.e., the second cutting device of the pump. Among them, the upper end surface of the impeller 2, i.e., the place where it fits with the impeller blades, is processed with a spiral triangular concave-convex groove. The clearance between the two is extremely small, and it has a tearing cutting function. The impeller blades rotate with the main shaft, and the base is stationary relative to the impeller blades, and the second cutting is completed by one movement and one stillness.

[0026] The impeller 2 and the base 5 are made of 2Cr13 martensitic stainless steel, which has extremely high hardness and long service life.

[0027] In the present invention, all directional indications (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0028] It should be noted that in the application documents of this patent, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one" do not exclude the existence of other identical elements in the process, method, article or device including the elements. In the application documents of this patent, if it is mentioned that an action is performed according to an element, it means that the action is performed at least according to the element, which includes two situations: performing the action only according to the element, and performing the action according to the element and other elements. Expressions such as multiple, multiple, and multiple include 2, 2 times, 2 kinds, and more than 2, more than 2 times, and more than 2 kinds.

[0029] All documents mentioned in this application are considered to be included in the disclosure of this application as a whole, so that they can be used as the basis for modification when necessary. In addition, it should be understood that after reading the above disclosure of this application, those skilled in the art can make various changes or modifications to this application, and these equivalent forms also fall within the scope of protection claimed in this application.

Claims

1. A submersible sewage pump with a double cutting device, characterized in that: include: Pump body, impeller, cutter head, cutter head, base; among them, A first cutting device is formed between the cutter disc and the cutter head, and the first cutting device is a friction pair; A second cutting device is formed between the impeller and the base, and the second cutting device is a cutting pair.

2. The submersible sewage pump according to claim 1, characterized in that: The end surface of the base that matches with the impeller blades is provided with a spiral triangular concave-convex groove.

3. The submersible sewage pump according to claim 1, characterized in that: The cutter head is configured to rotate with the main shaft, and the cutter disc is fixed on the base.

4. The submersible sewage pump according to claim 1, characterized in that: The cutter disc is provided with a cutting groove.

5. The submersible sewage pump according to claim 4, characterized in that: The number of the cutting grooves is 4.

6. The submersible sewage pump according to claim 1, characterized in that: The cutter head is provided with three cutting edges.

7. The submersible sewage pump according to claim 1, characterized in that: The impeller and the base are made of martensitic stainless steel.

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