Chilling water pump

Abstract

The utility model relates to the technical field of centrifugal pumps, in particular to a chilling water pump which comprises a pump body, a front pump cover, a rear pump cover, a front lining plate and a rear lining plate, the left side of the pump body is detachably connected with the front pump cover through a first connecting piece, the right side of the pump body is detachably connected with the rear pump cover through a second connecting piece, and a valve cavity is formed in the pump body. A first clamping groove is formed between the pump body and the front pump cover, a second clamping groove is formed between the pump body and the rear pump cover, a first clamping protrusion is arranged on the outer side wall of the front lining plate, a second clamping protrusion is arranged on the outer side wall of the rear lining plate, the first clamping protrusion is clamped in the first clamping groove in a matched mode, and the second clamping protrusion is clamped in the second clamping groove in a matched mode. According to the chilling water pump, the front lining plate is clamped and fixed by the pump body and the front pump cover, the rear lining plate is clamped and fixed by the pump body and the rear pump cover, inner hexagon bolts are not adopted for fastening connection any more, installation, disassembly and maintenance are convenient, the possibility that an impeller is damaged due to falling of the bolts is effectively reduced, and the service time of the chilling water pump is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal pump technology, and in particular to a quenching water pump. Background Technology

[0002] One of the three key pumps in the pressurized gasification technology of coal-water slurry in modern coal chemical plants is the quench water pump, also known as the black water circulation pump or ash water circulation pump. It operates under extremely harsh conditions, with operating temperatures of 240℃-260℃ and inlet pressures of 4.5, 6.5, and 8.5 MPa. The medium contains 0.5-3% solid particles and suspended matter and is corrosive. Whether the quench water pump can operate normally is crucial to the safe and stable production of the enterprise.

[0003] One commonly used quench water pump in service is a double-volute single-layer pump body type, which includes a pump body, a front pump cover, a rear pump cover, a front liner, and a rear liner. The left side of the pump body is detachably connected to the front pump cover by connecting bolts, and the right side of the pump body is detachably connected to the rear pump cover by connecting bolts. The pump body has a pump chamber, and the impeller is installed in the pump chamber. The front and rear liners are fixed to the front and rear pump covers by hexagon socket head cap screws, respectively. During use, the hexagon socket head cap screws are prone to popping out and falling off. The inside of the hexagon socket head cap screw is the impeller. Popping out the hexagon socket head cap screw will damage the impeller and reduce the service life of the quench water pump. Utility Model Content

[0004] The technical problem solved by this utility model is to provide a quenching water pump with a longer service life.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a quenching water pump, including a pump body, a front pump cover, a rear pump cover, a front liner, and a rear liner. The left side of the pump body is detachably connected to the front pump cover through a first connector, and the right side of the pump body is detachably connected to the rear pump cover through a second connector. A pump chamber is provided in the pump body. A first slot is provided between the pump body and the front pump cover, and a second slot is provided between the pump body and the rear pump cover. A first locking protrusion is provided on the outer side wall of the front liner, and a second locking protrusion is provided on the outer side wall of the rear liner. The first locking protrusion matches and is locked in the first slot, and the second locking protrusion matches and is locked in the second slot, thereby detachably setting the front liner and the rear liner in the pump chamber.

[0006] Furthermore, the first card slot, the second card slot, the first card protrusion, and the second card protrusion are all annular structures.

[0007] Furthermore, both the first and second connecting parts are connecting bolts.

[0008] Furthermore, the first and second slots are disposed on the inner wall of the pump chamber, and the outer wall of the front liner is in contact with the inner wall of the pump chamber, the left side wall of the front liner is in contact with the right side wall of the front pump cover, the outer wall of the rear liner is in contact with the inner wall of the pump chamber, and the right side wall of the rear liner is in contact with the left side wall of the rear pump cover.

[0009] Furthermore, a first sealing structure is provided between the front liner, the pump body and the front pump cover, and a second sealing structure is provided between the rear liner, the pump body and the rear pump cover.

[0010] Furthermore, the front pump cover is provided with a medium channel that runs through the left and right sides, and also includes an inlet bushing and connecting screws. The inlet bushing includes a hollow flow channel and a connecting ring. The connecting ring is vertically set on the outer side wall of the flow channel and is provided with a threaded connection through hole. The right side wall of the front pump cover is provided with a connecting thread groove.

[0011] A clearance groove is provided on the left side wall of the front liner. The connecting screw passes through the threaded connection through hole and the connecting thread groove to detachably install the inlet bushing in the medium channel. The head of the connecting screw is located in the clearance groove. The outer side wall of the flow channel is in contact with the inner wall of the medium channel, and the left side wall of the connecting ring is in contact with the right side wall of the front pump cover.

[0012] Furthermore, a metal spiral wound gasket sealing structure is provided between the left side wall of the connecting ring and the right side wall of the front pump cover.

[0013] Furthermore, the front liner, rear liner, and inlet bushing are made of duplex steel Cr30H ​​with an HRC of 34-48; the pump body, front pump cover, and rear pump cover are made of 06Cr13Ni4Mo.

[0014] Furthermore, it also includes a bearing housing assembly, which is connected and located on the right side of the pump body. The bearing housing assembly contains a rotating shaft, on which an impeller is mounted, and the impeller is located in the pump chamber.

[0015] The impeller includes a front cover plate and a rear cover plate. The main blades are arranged between the front cover plate and the rear cover plate. 6-12 auxiliary blades are evenly distributed on the left side of the front cover plate.

[0016] Furthermore, the impeller is made of duplex steel Cr30H ​​with an HRC of 34-48.

[0017] The beneficial effects of this utility model are as follows: A first slot is provided between the pump body and the front pump cover, and a second slot is provided between the pump body and the rear pump cover. A first locking protrusion is provided on the outer wall of the front liner, and a second locking protrusion is provided on the outer wall of the rear liner. The first locking protrusion matches and engages in the first slot, and the second locking protrusion matches and engages in the second slot. This allows the front and rear liners to be detachably installed in the pump cavity, ensuring that the front liner is clamped and fixed by the pump body and the front pump cover, and the rear liner is clamped and fixed by the pump body and the rear pump cover. The use of hexagonal socket head caps for fastening eliminates the need for bolts, facilitating installation, disassembly, and maintenance. This effectively reduces the possibility of bolts coming loose and damaging the impeller, thus extending the service life of the quench pump. The inlet bushing is fixed to the front pump cover by connecting screws, with the screw heads located in the clearance groove of the front liner, improving the connection strength of the inlet bushing without damaging the impeller. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0020] Figure 3 yes Figure 1 Enlarged view at point B in the middle;

[0021] Figure 4 This is a schematic diagram of the impeller structure;

[0022] The components are labeled as follows: Pump body 1, front pump cover 2, rear pump cover 3, front liner 4, rear liner 5, pump chamber 6, first locking protrusion 7, second locking protrusion 8, first sealing structure 9, second sealing structure 10, inlet bushing 11, connecting screw 12, metal spiral wound gasket sealing structure 13, bearing housing assembly 14, rotating shaft 15, impeller 16, auxiliary blades 17, first connecting piece 18, second connecting piece 19. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0024] The directions mentioned below are in the form of Figure 1 The orientation of each component is used as a reference.

[0025] like Figure 1 , Figure 2 and Figure 3As shown, the present invention provides a quenching water pump comprising a pump body 1, a front pump cover 2, a rear pump cover 3, a front liner 4, and a rear liner 5. The pump body 1 is a double-volute single-layer pump body. The left side of the pump body 1 is detachably connected to the front pump cover 2 via a first connector, and the right side of the pump body 1 is detachably connected to the rear pump cover 3 via a second connector. A pump chamber 6 is provided in the pump body 1. A first slot is provided between the pump body 1 and the front pump cover 2, and a second slot is provided between the pump body 1 and the rear pump cover 3. A first locking protrusion 7 is provided on the outer side wall of the front liner 4, and a second locking protrusion 8 is provided on the outer side wall of the rear liner 5. The first locking protrusion 7 is matched and locked in the first slot, and the second locking protrusion 8 is matched and locked in the second slot, thereby detachably placing the front liner 4 and the rear liner 5 in the pump chamber 6.

[0026] For ease of installation and disassembly, the first and second connectors can be connecting screws, connecting bolts, etc.

[0027] The front liner 4 is clamped and fixed by the pump body 1 and the front pump cover 2, and the rear liner 4 is clamped and fixed by the pump body 1 and the rear pump cover 3. The internal hex bolts are no longer used for fastening, which facilitates installation and disassembly, and makes maintenance easier. This effectively reduces the possibility of bolts falling off and causing damage to the impeller 16, and increases the service life of the quench water pump.

[0028] Specifically, to improve the connection strength between the front liner 4 and the rear liner 5, the first slot, the second slot, the first protrusion 7, and the second protrusion 8 are all annular structures. That is, a first slot is provided between the pump body 1 and the front pump cover 2, a second slot is provided between the pump body 1 and the rear pump cover 3, a first protrusion 7 is provided on the outer wall of the front liner 4, and a second protrusion 8 is provided on the outer wall of the rear liner 5, thereby effectively increasing the connection area and improving the connection strength between the front liner 4 and the rear liner 5. To further improve the connection strength between the front liner 4 and the rear liner 5, for example... Figure 1 , Figure 2 and Figure 3 As shown, the first and second slots are disposed on the inner wall of the pump chamber 6, and the outer wall of the front liner 4 abuts against the inner wall of the pump chamber 6, the left side wall of the front liner 4 abuts against the right side wall of the front pump cover 2, the outer wall of the rear liner 5 abuts against the inner wall of the pump chamber 6, and the right side wall of the rear liner 5 abuts against the left side wall of the rear pump cover 3. The first slot is disposed between the pump body 1 and the front pump cover 2, and the second slot is disposed between the pump body 1 and the rear pump cover 3. The first and second slots are disposed on the inner wall of the pump chamber 6, which is equivalent to the first and second slots being disposed at both ends of the inner wall of the pump chamber 6, which facilitates the processing of the first and second slots and the assembly of the front liner 4 and the rear liner 5.

[0029] To improve the sealing performance of the quench water pump, for example... Figure 1 , Figure 2 and Figure 3As shown, a first sealing structure 9 is provided between the front liner 4, the pump body 1, and the front pump cover 2, and a second sealing structure 10 is provided between the rear liner 5, the pump body 1, and the rear pump cover 3. The first sealing structure 9 and the second sealing structure 10 are preferably metal spiral wound gasket sealing structures.

[0030] To extend the service life of the front pump cover 2, for example... Figure 1 , Figure 2 As shown, this utility model also includes an inlet bushing 11 and a connecting screw 12. A media channel extending through the left and right sides is provided in the front pump cover 2. The inlet bushing 11 includes a hollow flow channel portion and a connecting ring portion. The connecting ring portion is vertically positioned on the outer wall of the flow channel portion and has a threaded connection through hole. A connecting thread groove is provided on the right side wall of the front pump cover 2. A clearance groove is provided on the left side wall of the front liner plate 4. The connecting screw 12 passes through the threaded connection through hole and the connecting thread groove to detachably mount the inlet bushing 11 in the media channel, with the head of the connecting screw 12 located in the clearance groove. The outer wall of the flow channel portion abuts against the inner wall of the media channel, and the left side wall of the connecting ring portion abuts against the right side wall of the front pump cover 2. Both the flow channel portion and the connecting ring portion are cylindrical. There are multiple connecting screws 12, threaded connection through holes, connecting thread grooves, and clearance grooves, and they correspond one-to-one.

[0031] To improve the sealing performance of the quench pump, a metal spiral wound gasket sealing structure 13 is provided between the left side wall of the connecting ring and the right side wall of the front pump cover 2.

[0032] For example Figure 1 As shown, the quench water pump of this utility model also includes a bearing housing assembly 14, which is connected to the right side of the pump body 1 by connecting bolts. A rotating shaft 15 is disposed within the bearing housing assembly 14, and an impeller 16 is mounted on the rotating shaft 15. The impeller 16 is disposed within the pump chamber 6. Figure 4 As shown, the impeller 16 includes a front cover plate and a rear cover plate. A main blade is disposed between the front and rear cover plates, and 6-12 auxiliary blades 17 are evenly spaced on the left side of the front cover plate. Because high-speed backflow of the medium at the outlet of the impeller 16 can cause cavitation, cavitation easily occurs at the sealing ring, front liner 4, and inlet bushing 11 of the impeller 16, leading to premature failure of these three components and affecting their service life. By providing 6-12 auxiliary blades 17 evenly spaced on the left side of the front cover plate, the backflow cavitation problem of the quench pump is solved, and the service life of the quench pump is improved.

[0033] Because the quench water pump operates in harsh environments, in order to further extend its service life, the front liner 4, rear liner 5, and inlet bushing are made of duplex steel Cr30H ​​with an HRC hardness of 34-48; the pump body 1, front pump cover 2, and rear pump cover 3 are made of 06Cr13Ni4Mo; and the impeller 16 is made of duplex steel Cr30H ​​with an HRC hardness of 34-48, effectively increasing the wear and corrosion resistance of each component.

[0034] A throttling bushing is fitted on the rotating shaft 15. In order to reduce the possibility of black water medium entering the mechanical seal cavity, the throttling bushing is provided with a reverse spiral groove. The cross section of the spiral groove is rectangular, and the mechanical seal spring is set on the stationary ring seat. The mechanical seal spring does not come into contact with the black and gray medium, thus extending the service life of the mechanical seal.

[0035] In summary, the above settings increase the trouble-free operating time of the quench water pump from approximately 70 days to over 180 days, significantly extending its service life and facilitating large-scale use.

Claims

1. A quenching water pump, comprising a pump body (1), a front pump cover (2), a rear pump cover (3), a front liner (4), and a rear liner (5), wherein the left side of the pump body (1) is detachably connected to the front pump cover (2) via a first connector, and the right side of the pump body (1) is detachably connected to the rear pump cover (3) via a second connector, and a pump chamber (6) is provided in the pump body (1), characterized in that: A first slot is provided between the pump body (1) and the front pump cover (2), and a second slot is provided between the pump body (1) and the rear pump cover (3). A first locking protrusion (7) is provided on the outer side wall of the front liner (4), and a second locking protrusion (8) is provided on the outer side wall of the rear liner (5). The first locking protrusion (7) is matched and locked in the first slot, and the second locking protrusion (8) is matched and locked in the second slot, thereby detachably setting the front liner (4) and the rear liner (5) in the pump cavity (6).

2. The quenching water pump as described in claim 1, characterized in that: The first card slot, the second card slot, the first card protrusion (7), and the second card protrusion (8) are all annular structures.

3. The quenching water pump as described in claim 1, characterized in that: Both the first and second connecting parts are connecting bolts.

4. The quenching water pump as described in claim 1, characterized in that: The first slot and the second slot are set on the inner wall of the pump chamber (6), and the outer wall of the front liner (4) is in contact with the inner wall of the pump chamber (6), the left side wall of the front liner (4) is in contact with the right side wall of the front pump cover (2), the outer wall of the rear liner (5) is in contact with the inner wall of the pump chamber (6), and the right side wall of the rear liner (5) is in contact with the left side wall of the rear pump cover (3).

5. The quenching water pump as described in claim 4, characterized in that: A first sealing structure (9) is provided between the front liner (4), the pump body (1) and the front pump cover (2), and a second sealing structure (10) is provided between the rear liner (5), the pump body (1) and the rear pump cover (3).

6. The quenching water pump as described in claim 1, characterized in that: The front pump cover (2) is provided with a medium channel that runs through the left and right sides, and also includes an inlet bushing (11) and a connecting screw (12). The inlet bushing (11) includes a hollow flow channel and a connecting ring. The connecting ring is vertically set on the outer side wall of the flow channel. A threaded connection through hole is provided on the connecting ring. A connecting thread groove is provided on the right side wall of the front pump cover (2). A clearance groove is provided on the left side wall of the front liner (4). The connecting screw (12) passes through the threaded connection through hole and the connecting thread groove to detachably install the inlet bushing (11) in the medium channel. The head of the connecting screw (12) is located in the clearance groove. The outer side wall of the flow channel is close to the inner wall of the medium channel, and the left side wall of the connecting ring is close to the right side wall of the front pump cover (2).

7. The quenching water pump as described in claim 6, characterized in that: A metal spiral wound gasket sealing structure (13) is provided between the left side wall of the connecting ring and the right side wall of the front pump cover (2).

8. The quenching water pump as described in claim 6, characterized in that: The front liner (4), rear liner (5) and inlet bushing are made of duplex steel Cr30H ​​with an HRC of 34-48; the pump body (1), front pump cover (2) and rear pump cover (3) are made of 06Cr13Ni4Mo.

9. The quenching water pump according to any one of claims 1 to 8, characterized in that: It also includes a bearing housing assembly (14), which is connected to the right side of the pump body (1). A rotating shaft (15) is provided in the bearing housing assembly (14), and an impeller (16) is fitted on the rotating shaft (15). The impeller (16) is located in the pump chamber (6). The impeller (16) includes a front cover plate and a rear cover plate. A main blade is provided between the front cover plate and the rear cover plate. 6-12 auxiliary blades (17) are evenly distributed on the left side of the front cover plate.

10. The quenching water pump as described in claim 9, characterized in that: The impeller (16) is made of duplex steel Cr30H ​​with an HRC of 34-48.

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