A sealed circulating pump

Abstract

The utility model provides a kind of sealed circulating pump, belong to water pump technical field.It solves the problem that traditional circulating pump is mostly single-stage mechanical seal or packing seal, easy to cause leakage due to wear and tear, corrosion after long-term operation, affect system sealing performance;Part of pump body structure is complex, and maintenance cost is high.The sealed circulating pump, including upper pump cover, lower pump cover, pump shell and transmission shaft, transmission shaft passes through upper pump cover and extends outward, pump shell is arranged between upper and lower pump cover and plays a protective role, and the upper and lower pump cover and pump shell form a cavity, the impeller for driving liquid is arranged in the cavity, the impeller is sleeved on the transmission shaft, a plurality of protruding parts are arranged at the edge of upper and lower pump cover, the pump shell has fixed block corresponding to protruding part.The utility model has the advantages of high efficiency sealing.

Description

Technical Field

[0001] This utility model belongs to the field of water pump technology, and specifically relates to a sealed circulation pump. Background Technology

[0002] A circulating pump is a pump used in a device to transport circulating liquids for reaction, absorption, separation, and absorption liquid regeneration. It has a relatively low head, used only to overcome the pressure drop in the circulating system. Low-head pumps can be used. The term "circulating pump" refers to the pump's function, while "centrifugal pump" refers to its structure; these are completely different concepts. The working principle of a circulating pump is to circulate water; for example, hot water in a plumbing system is circulated using a circulating pump.

[0003] Traditional circulating pumps mostly use single-stage mechanical seals or packing seals, which are prone to leakage due to wear and corrosion after long-term operation, affecting the sealing performance of the system; some pumps have complex structures and high maintenance costs. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by providing a high-efficiency sealed circulation pump.

[0005] The objective of this utility model can be achieved through the following technical solution: A sealed circulation pump, characterized in that it includes an upper pump cover, a lower pump cover, a pump housing, and a drive shaft. The drive shaft passes through the upper pump cover and extends outward. The pump housing is disposed between the upper and lower pump covers for protection. A cavity is formed between the upper and lower pump covers and the pump housing. An impeller for driving liquid is disposed in the cavity. The impeller is sleeved on the drive shaft. Several protrusions are provided at the edges of the upper and lower pump covers. The pump housing has fixing blocks corresponding to the protrusions. Bolt holes are provided on each fixing block and protrusion. The pump housing is fixed to the upper and lower pump covers by bolts. A sealing groove is formed around the bolt holes on the fixing blocks. The sealing groove has an L-shaped cross-section. A sealing component for sealing is disposed in the sealing groove.

[0006] In the aforementioned sealed circulation pump, the sealing assembly includes sealing rings located at both ends of the sealing groove. A movable pad is provided at the bottom of the sealing ring, and an elastic element with a reset function is provided on the movable pad. The sealing groove forms a vacuum channel between the movable pads, and the vacuum channel contains hydraulic oil.

[0007] In the aforementioned type of sealed circulating pump, the sealing groove is designed with an arc-shaped structure around the bolt hole.

[0008] In the aforementioned sealed circulation pump, a coupling for connecting the main shaft of the drive unit is provided on the other end of the drive shaft. Sealing principle: When the bolts are tightened, pressure is transmitted through the protrusions to the sealing rings and movable pads. The movable pads apply pressure to the hydraulic oil within the vacuum channel. According to Pascal's principle, this pressure is evenly distributed in all directions within the hydraulic oil, resulting in a uniform and continuous outward expanding lateral pressure exerted by the two movable pads on the sealing rings on both sides. This "hydraulic self-tightening" effect greatly enhances the sealing performance of the sealing rings at both ends. As the fluid pressure within the internal cavity increases, this pressure further acts on the sealing assembly, converting the pressure into a stronger sealing force through the hydraulic oil, achieving the ideal effect of a tighter seal with higher pressure.

[0009] Compared with existing technologies, this sealed circulation pump adopts a composite sealing structure of "L-shaped sealing groove + hydraulic self-tightening". The elastic element provides the initial preload, while the internal hydraulic oil can convert the system pressure and bolt tightening force into a uniform lateral sealing force, forming a dynamic sealing effect. It is especially suitable for high-pressure, pulse or vibration conditions, and effectively prevents leakage at the interface. Attached Figure Description

[0010] Figure 1 This is a 3D view of the sealed circulating pump.

[0011] Figure 2 This is a cross-sectional view of the sealed circulating pump.

[0012] Figure 3 This is a partial sectional view of the sealed circulating pump.

[0013] Figure 4 This is a schematic diagram of the pump casing of this sealed circulation pump.

[0014] In the diagram, 1. Upper pump cover; 2. Lower pump cover; 3. Pump casing; 4. Drive shaft; 5. Impeller; 6. Protrusion; 7. Fixing block; 8. Bolt hole; 9. Sealing groove; 10. Sealing assembly; 11. Sealing ring; 12. Moving pad; 13. Elastic element; 14. Vacuum channel; 15. Coupling. Detailed Implementation

[0015] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0016] like Figure 1As shown, this sealed circulating pump includes an upper pump cover 1, a lower pump cover 2, a pump casing 3, and a drive shaft 4. The drive shaft 4 passes through the upper pump cover 1 and extends outward. The pump casing 3 is positioned between the upper and lower pump covers 2 for protection. The upper pump cover 1 and the lower pump cover 2 are connected by the intermediate pump casing 3, together forming the main structure of the pump. A cavity is formed between the upper and lower pump covers 2 and the pump casing 3. An impeller 5 for driving the liquid is installed in the cavity. The impeller 5 is sleeved on the drive shaft 4. When the impeller 5 rotates, its blades drive the liquid to generate centrifugal motion, thereby realizing the liquid transport. Several [unclear - possibly referring to a specific type of device] are provided at the edges of the upper and lower pump covers 2. The pump housing 3 has a corresponding fixing block 7 on the protrusion 6. Each fixing block 7 and the protrusion 6 is provided with bolt holes 8. The pump housing 3 is fixed to the upper and lower pump covers 2 by bolts. During assembly, the protrusion 6 is aligned with the fixing block 7, the bolts are passed through the bolt holes 8 and the nuts are tightened to firmly fix the upper pump cover 1, the pump housing 3 and the lower pump cover 2 together. The two ends of the fixing block 7 are provided with sealing grooves 9 around the bolt holes 8, and the cross-section of the sealing groove 9 is L-shaped. The L-shaped sealing groove 9 facilitates the flow of liquid. A sealing component 10 is provided in the sealing groove 9 to perform the sealing function.

[0017] To elaborate further, the sealing assembly 10 includes sealing rings 11 located at both ends of the sealing groove 9. The two sealing rings 11 are located at both ends of the sealing groove 9 and directly contact the bottom surfaces of the protrusions 6 of the upper pump cover 1 and the lower pump cover 2 to form a preliminary static seal. A movable pad 12 is provided at the bottom of the sealing ring 11, and an elastic element 13 with a reset function is provided on the movable pad 12. The elastic element 13 always provides an upward preload force to the sealing ring 11 to ensure that good sealing contact can still be maintained even if the bolt preload is slightly loosened or the sealing ring 11 is slightly worn. A vacuum channel 14 is formed between the movable pads 12 in the sealing groove 9, and hydraulic oil is contained in the vacuum channel 14.

[0018] To elaborate further, the sealing groove 9 is designed in an arc shape around the bolt hole 8. Preferably, the sealing groove 9 is an arc shape around the bolt hole 8. This shape can better accommodate the sealing component 10 and evenly distribute the sealing pressure.

[0019] To elaborate further, a coupling 15 for connecting the main shaft of the drive unit is provided on the other end of the drive shaft 4.

[0020] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0021] Although this document frequently uses terms such as upper pump cover 1, lower pump cover 2, pump casing 3, drive shaft 4, impeller 5, protrusion 6, fixing block 7, bolt hole 8, sealing groove 9, sealing assembly 10, sealing ring 11, moving pad 12, elastic element 13, vacuum channel 14, and coupling 15, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A seal circulating pump characterized by, The pump includes an upper pump cover (1), a lower pump cover (2), a pump housing (3), and a drive shaft (4). The drive shaft (4) passes through the upper pump cover (1) and extends outward. The pump housing (3) is positioned between the upper and lower pump covers (2) for protection. A cavity is formed between the upper and lower pump covers (2) and the pump housing (3). An impeller (5) for driving the liquid is disposed in the cavity. The impeller (5) is sleeved on the drive shaft (4). Several protrusions are provided at the edges of the upper and lower pump covers (2). The pump housing (3) has a fixing block (7) corresponding to the protrusion (6). Each fixing block (7) and the protrusion (6) is provided with bolt holes (8). The pump housing (3) is fixed to the upper and lower pump covers (2) by bolts. The two ends of the fixing block (7) are provided with sealing grooves (9) around the bolt holes (8). The sealing groove (9) has an L-shaped cross section. A sealing component (10) is provided in the sealing groove (9) to perform the sealing function.

2. A canned circulation pump according to claim 1, wherein The sealing assembly (10) includes sealing rings (11) located at both ends of the sealing groove (9), a movable pad (12) is provided at the bottom of the sealing ring (11), and an elastic element (13) with a reset function is provided on the movable pad (12). A vacuum channel (14) is formed between the movable pads (12) in the sealing groove (9), and hydraulic oil is contained in the vacuum channel (14).

3. A canned circulation pump according to claim 1, wherein The sealing groove (9) is designed in an arc shape around the bolt hole (8).

4. A sealed circulation pump according to claim 1, characterized in that, A coupling (15) for connecting the main shaft of the drive device is provided on the other end of the drive shaft (4).

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