Chilling water pump

Abstract

The invention 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] The invention relates to the technical field of centrifugal pumps, and in particular to a quenching water pump. Background Art

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

[0003] A commonly used chilled 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. A pump chamber is provided in the pump body, and an impeller is provided in the pump chamber. The front liner and the rear liner are respectively fixed to the front pump cover and the rear pump cover with hexagon socket bolts. During use, the hexagon socket bolts are easy to pop out and fall off. The inner side of the hexagon socket bolts is the impeller. The popping out of the hexagon socket bolts will cause damage to the impeller and reduce the service life of the chilled water pump. Summary of the invention

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

[0005] The technical solution adopted by the present invention to solve its technical problems is: a chilled water pump, including 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 to the front pump cover through a first connecting piece, and the right side of the pump body is detachably connected to the rear pump cover through a second connecting piece, a pump cavity is arranged in the pump body, a first card slot is arranged between the pump body and the front pump cover, a second card slot is arranged between the pump body and the rear pump cover, a first card protrusion is arranged on the outer side wall of the front lining plate, and a second card protrusion is arranged on the outer side wall of the rear lining plate, the first card protrusion is matched and stuck in the first card slot, and the second card protrusion is matched and stuck in the second card slot, so that the front lining plate and the rear lining plate are detachably arranged in the pump cavity.

[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, the first connecting member and the second connecting member are both connecting bolts.

[0008] Furthermore, the first card slot and the second card slot are arranged on the inner wall of the pump chamber, and the outer wall of the front lining plate is abutted against the inner wall of the pump chamber, the left side wall of the front lining plate is abutted against the right side wall of the front pump cover, the outer wall of the rear lining plate is abutted against the inner wall of the pump chamber, and the right side wall of the rear lining plate is abutted against 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, a left-right through medium channel is provided in the front pump cover, and the front pump cover also includes an inlet bushing and a connecting screw. The inlet bushing includes a hollow flow channel portion and a connecting ring portion. The connecting ring portion is vertically arranged on the outer side wall of the flow channel portion. The connecting ring portion is provided with a threaded connecting through hole. A connecting thread groove is provided on the right side wall of the front pump cover.

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

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

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

[0014] Furthermore, it also includes a bearing box assembly, which is connected to the right side of the pump body, and a rotating shaft is arranged in the bearing box assembly, and an impeller is mounted on the rotating shaft, and the impeller is arranged in the pump chamber;

[0015] The impeller comprises a front cover plate and a rear cover plate, main blades are arranged between the front cover plate and the rear cover plate, and 6 to 12 pairs of blades evenly distributed at intervals are arranged on the left side surface of the front cover plate.

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

[0017] The beneficial effects of the present invention are as follows: a first card slot is provided between the pump body and the front pump cover, a second card slot is provided between the pump body and the rear pump cover, a first card protrusion is provided on the outer wall of the front liner, a second card protrusion is provided on the outer wall of the rear liner, the first card protrusion is matched and stuck in the first card slot, and the second card protrusion is matched and stuck in the second card slot, so that the front liner and the rear liner are detachably arranged in the pump cavity, so 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, and the hexagon socket bolts are no longer used for fastening and connection, which is convenient for installation and disassembly, and maintenance, and effectively reduces the possibility of damage to the impeller caused by the falling of the bolts, and increases the service life of the quenching water pump. The inlet bushing is fixed to the front pump cover by a connecting screw, and the head of the connecting screw is located in the give way groove of the front liner, which improves the connection firmness of the inlet bushing and does not damage the impeller. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention;

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

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

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

[0022] Marked as: pump body 1, front pump cover 2, rear pump cover 3, front lining plate 4, rear lining plate 5, pump chamber 6, first clamping protrusion 7, second clamping protrusion 8, first sealing structure 9, second sealing structure 10, inlet bushing 11, connecting screws 12, metal winding gasket sealing structure 13, bearing box assembly 14, rotating shaft 15, impeller 16, auxiliary blades 17, first connecting piece 18, second connecting piece 19. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0024] The following refers to the location Figure 1 The position of each component in the figure is taken as the reference.

[0025] like Figure 1 , Figure 2 and Figure 3As shown, the chilled water pump of the present invention comprises a pump body 1, a front pump cover 2, a rear pump cover 3, a front lining plate 4 and a rear lining plate 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 through a first connecting piece, and the right side of the pump body 1 is detachably connected to the rear pump cover 3 through a second connecting piece. A pump chamber 6 is arranged in the pump body 1, a first card slot is arranged between the pump body 1 and the front pump cover 2, a second card slot is arranged between the pump body 1 and the rear pump cover 3, a first card protrusion 7 is arranged on the outer wall of the front lining plate 4, and a second card protrusion 8 is arranged on the outer wall of the rear lining plate 5. The first card protrusion 7 is matched and stuck in the first card slot, and the second card protrusion 8 is matched and stuck in the second card slot, so that the front lining plate 4 and the rear lining plate 5 are detachably arranged in the pump chamber 6.

[0026] To facilitate installation and disassembly, the first connecting member and the second connecting member may 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. Hexagon socket bolts are no longer used for fastening, which is convenient for installation and disassembly, and easy for maintenance. The possibility of damage to the impeller 16 caused by the falling of the bolts is effectively reduced, and the service life of the quenching water pump is increased.

[0028] Specifically, in order to improve the connection firmness between the front liner 4 and the rear liner 5, the first clamping groove, the second clamping groove, the first clamping protrusion 7 and the second clamping protrusion 8 are all annular structures. That is, a circle of first clamping grooves is provided between the pump body 1 and the front pump cover 2, a circle of second clamping grooves is provided between the pump body 1 and the rear pump cover 3, a circle of first clamping protrusions 7 is provided on the outer wall of the front liner 4, and a circle of second clamping protrusions 8 is provided on the outer wall of the rear liner 5, thereby effectively increasing the connection area and improving the connection firmness between the front liner 4 and the rear liner 5. In order to further improve the connection firmness between the front liner 4 and the rear liner 5, as shown in FIG. Figure 1 , Figure 2 and Figure 3 As shown, the first card slot and the second card slot are arranged on the inner wall of the pump chamber 6, and the outer side 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 side 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. The first card slot is arranged between the pump body 1 and the front pump cover 2, the second card slot is arranged between the pump body 1 and the rear pump cover 3, and the first card slot and the second card slot are arranged on the inner wall of the pump chamber 6 at the same time, which is equivalent to the first card slot and the second card slot being arranged at both ends of the inner wall of the pump chamber 6, which is convenient for processing the first card slot and the second card slot, and convenient for assembling the front liner 4 and the rear liner 5.

[0029] In order to improve the sealing performance of the quenching water pump, 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 wound gasket sealing structures.

[0030] In order to increase the service life of the front pump cover 2, Figure 1 , Figure 2 As shown, the present invention is also provided with an inlet bushing 11 and a connecting screw 12, a left-right through medium channel 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 arranged on the outer side wall of the flow channel portion, a threaded connection through hole is arranged on the connecting ring portion, and a connecting thread groove is arranged on the right side wall of the front pump cover 2; a clearance groove is arranged on the left side wall of the front liner 4, the connecting screw 12 matches and passes through the threaded connection through hole and the connecting thread groove to detachably arrange the inlet bushing 11 in the medium channel, and the head of the connecting screw 12 is located in the clearance groove, the outer side wall of the flow channel portion is in contact with the inner wall of the medium channel, and the left side wall of the connecting ring portion is in contact with the right side wall of the front pump cover 2. The flow channel portion and the connecting ring portion are both cylindrical, and the number of the connecting screw 12, the threaded connection through hole, the connecting thread groove, and the clearance groove is multiple, and they correspond one to one.

[0031] In order to improve the sealing performance of the chilled water pump, a metal wound gasket sealing structure 13 is provided between the left side wall of the connecting ring portion and the right side wall of the front pump cover 2 .

[0032] For example Figure 1 As shown, the chilled water pump of the present invention further comprises a bearing box assembly 14, which is connected to the right side of the pump body 1 by connecting bolts, and a rotating shaft 15 is arranged in the bearing box assembly 14, and an impeller 16 is mounted on the rotating shaft 15, and the impeller 16 is arranged in the pump chamber 6; Figure 4 As shown, the impeller 16 includes a front cover plate and a rear cover plate, and main blades are arranged between the front cover plate and the rear cover plate, and 6-12 pairs of blades 17 are evenly spaced and arranged on the left side of the front cover plate. Since the high-speed backflow of the medium at the outlet of the impeller 16 will cause cavitation, cavitation is easily generated at the sealing ring, the front liner 4, and the inlet bushing 11 of the impeller 16, causing these three components to fail prematurely, affecting the service life. By arranging 6-12 pairs of blades 17 evenly spaced and arranged on the left side of the front cover plate, the backflow cavitation problem of the chilling water pump is solved and the service life of the chilling water pump is increased.

[0033] Since the use environment of the quenching water pump is relatively harsh, in order to further increase its service life, the material of the front liner 4, the rear liner 5 and the imported bushing is duplex steel Cr30H, and the HRC hardness is 34-48; the material of the pump body 1, the front pump cover 2 and the rear pump cover 3 is 06Cr13Ni4Mo, and the material of the impeller 16 is duplex steel Cr30H, and the HRC hardness is 34-48, which effectively increases the wear resistance and corrosion resistance of each component.

[0034] A throttling bushing is mounted on the rotating shaft 15. In order to reduce the possibility of black water medium entering the mechanical seal chamber, 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 arranged on the stationary ring seat. The mechanical seal spring does not contact the black ash medium, thereby extending the service life of the mechanical seal.

[0035] In summary, through the above settings, the trouble-free operation time of the quenching water pump is increased from the current 70 days to more than 180 days, and the service life is significantly increased, which is conducive to large-scale use.

Claims

1. A chilled water pump, comprising a pump body (1), a front pump cover (2), a rear pump cover (3), a front lining plate (4) and a rear lining plate (5), wherein the left side of the pump body (1) is detachably connected to the front pump cover (2) via a first connecting member, and the right side of the pump body (1) is detachably connected to the rear pump cover (3) via a second connecting member, and a pump chamber (6) is provided in the pump body (1), characterized in that: A first card slot is provided between the pump body (1) and the front pump cover (2), a second card slot is provided between the pump body (1) and the rear pump cover (3), a first card protrusion (7) is provided on the outer wall of the front lining plate (4), and a second card protrusion (8) is provided on the outer wall of the rear lining plate (5), the first card protrusion (7) is matched and clamped in the first card slot, and the second card protrusion (8) is matched and clamped in the second card slot, so that the front lining plate (4) and the rear lining plate (5) are detachably arranged in the pump chamber (6).

2. The chilled water pump according to 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 chilled water pump according to claim 1, characterized in that: The first connecting member and the second connecting member are both connecting bolts.

4. The chilled water pump according to claim 1, characterized in that: The first card slot and the second card slot are arranged 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 chilled water pump according to claim 4, characterized in that: A first sealing structure (9) is provided between the front lining plate (4), the pump body (1) and the front pump cover (2), and a second sealing structure (10) is provided between the rear lining plate (5), the pump body (1) and the rear pump cover (3).

6. The chilled water pump according to claim 1, characterized in that: The front pump cover (2) is provided with a medium passage extending from left to right, and further comprises an inlet bushing (11) and a connecting screw (12); the inlet bushing (11) comprises a hollow flow channel portion and a connecting ring portion, the connecting ring portion is vertically arranged on the outer side wall of the flow channel portion, a threaded connecting through hole is arranged on the connecting ring portion, and a connecting thread groove is arranged 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), and a connecting screw (12) matches and passes through the threaded connection through hole and the connecting thread groove to detachably set the inlet bushing (11) in the medium channel, and the head of the connecting screw (12) is located in the clearance groove, the outer wall of the flow channel part is in contact with the inner wall of the medium channel, and the left side wall of the connecting ring part is in contact with the right side wall of the front pump cover (2).

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

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

9. The chilled water pump according to any one of claims 1 to 8, characterized in that: The pump also comprises a bearing box assembly (14), the bearing box assembly (14) being connected to the right side of the pump body (1), a rotating shaft (15) being arranged in the bearing box assembly (14), an impeller (16) being mounted on the rotating shaft (15), and the impeller (16) being arranged in the pump chamber (6); The impeller (16) comprises a front cover plate and a rear cover plate, main blades are arranged between the front cover plate and the rear cover plate, and 6 to 12 pairs of blades (17) are evenly spaced and arranged on the left side surface of the front cover plate.

10. The chilled water pump according to claim 9, characterized in that: The material of the impeller (16) is duplex steel Cr30H, HRC 34-48.

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