Reciprocating pump

Abstract

The invention relates to the field of delivery pumps, and discloses a reciprocating pump which comprises a cylinder body (2) with a reciprocating channel (202), a pump head (3), a plunger (6) movably arranged in the reciprocating channel (202) and a power end (1) in transmission connection with the plunger (6), one end of the cylinder body (2) is perpendicularly connected to the side portion of the pump head (3), and the other end of the cylinder body (2) is perpendicularly connected to the side portion of the pump head (3). Two limiting grooves (201) extending in the circumferential direction are formed in the inner circumferential face of the cylinder body (2) in the axial direction in a spaced mode, and sealing filler (7) surrounding and connected to the plunger (6) is arranged in each limiting groove (201). According to the technical scheme, the sealing filler located in the limiting groove can be prevented from moving under the influence of reciprocating motion of the plunger, the sealing effect is guaranteed, media conveyed in the pump head are prevented from entering the position between the plunger and the cylinder body, and abrasion of the plunger and the cylinder body is reduced.

Description

Technical Field

[0001] The invention relates to the field of delivery pumps, in particular to a reciprocating pump. Background Art

[0002] For reciprocating pumps used in high-temperature, high-pressure applications such as residue oil hydrogenation, and where the working medium contains particles or coke, there is a large difference in working temperature between the power end and the pump head (over 200°C) during pump operation. If the structural design of a conventional high-pressure reciprocating pump is used, the large concentricity deviation between the pump plunger and the pump packing chamber may lead to abnormal wear of the plunger and packing seal and leakage of the medium. In severe cases, the high-temperature medium may leak and cause fire, which cannot meet the needs of long-term safe and stable operation of the device. Summary of the invention

[0003] The purpose of the present invention is to overcome the problem in the prior art that the conveying medium easily enters between the cylinder body and the plunger.

[0004] In order to achieve the above-mentioned objectives, the present invention provides a reciprocating pump on one hand, wherein the reciprocating pump includes a cylinder body having a reciprocating channel, a pump head, a plunger movably arranged in the reciprocating channel and a power end transmission-connected to the plunger, one end of the cylinder body is perpendicular to the side connected to the pump head, and two circumferentially extending limit grooves are axially spaced on the inner circumferential surface of the cylinder body, and each of the limit grooves is provided with a sealing filler surrounding and engaged with the plunger.

[0005] In some embodiments, the sealing packing includes a body portion and two annular sealing members axially spaced apart from each other and disposed on an inner circumferential surface of each end of the body portion.

[0006] In some embodiments, in each of the sealing packings, the spacing between the two sealing elements gradually increases in the radially inward direction; and / or, in each of the sealing packings, the radially inner ends of the two sealing elements are inclined toward the axially outward direction.

[0007] In some embodiments, the cylinder body is provided with a plurality of accommodating spaces surrounding the plunger, and the reciprocating pump includes a liquid inlet pipe connected to the cylinder body, a liquid outlet pipe, a box body for accommodating a cooling medium, and a collecting pipe connected to the liquid outlet pipe, and the collecting pipe and the liquid inlet pipe are respectively connected to the box body.

[0008] In some embodiments, the cylinder body is provided with a plurality of buffer spaces communicating with the accommodating space and a connecting channel communicating with the plurality of buffer spaces.

[0009] In some embodiments, the box body is provided with an upper chamber, a lower chamber, a connecting hole connecting the upper chamber and the lower chamber, a liquid outlet hole connected to the upper chamber, a liquid inlet hole connected to the lower chamber, and a first sealing plug inserted into the connecting hole, the liquid inlet hole is connected to the collecting pipe, the liquid outlet hole is connected to the liquid inlet pipe, and the first sealing plug can be moved upward to open the connecting hole.

[0010] In some embodiments, the reciprocating pump includes a first connecting pipe, a shell with a cooling channel disposed therein, and a cooling mechanism for injecting cooling water into the cooling channel. The first connecting pipe is partially accommodated in the cooling channel, and the two ends of the first connecting pipe are respectively connected to the liquid outlet and the liquid inlet pipe.

[0011] In some embodiments, the cooling mechanism includes a water tank, a second connecting pipe, a second sealing plug, a connecting rod and a connecting piece. A water outlet is provided at the bottom of the water tank. Both ends of the second connecting pipe are respectively connected to the water outlet and the cooling channel. The second sealing plug is provided in the water outlet. The connecting rod is connected to the second sealing plug. The first sealing plug is connected to a connecting rod extending to the outside of the box body. The connecting rod and the connecting rod are connected by the connecting piece. A spring is provided between the box body and the first sealing plug.

[0012] In some embodiments, a pressure chamber located between the cylinder body and the plunger is provided between the sealing filler relatively close to the pump head and the pump head, a water inlet hole connected to the pressure chamber is provided on the cylinder body, and the reciprocating pump includes a pressure mechanism, a third connecting pipe connected between the pressure mechanism and the water tank, and a fourth connecting pipe connected between the pressure mechanism and the water inlet hole.

[0013] In some embodiments, the pump head has a medium channel, and a first one-way valve and a second one-way valve are respectively disposed at both ends of the medium channel.

[0014] Through the above technical scheme, the sealing packing located in the limit groove can prevent the sealing packing from moving under the influence of the reciprocating movement of the plunger, thereby ensuring the sealing effect, avoiding or reducing the medium transported in the pump head from entering between the plunger and the cylinder body, and reducing the wear of the plunger and the cylinder body. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the reciprocating pump described in the implementation scheme of this solution;

[0016] Figure 2 A cross-sectional view of a pump head according to an embodiment of the present invention;

[0017] Figure 3 A cross-sectional view of a cylinder body and the like described in an embodiment of the present invention;

[0018] Figure 4 A cross-sectional view of the sealing filler described in the implementation scheme of this scheme;

[0019] Figure 5 A cross-sectional view of a cylinder body and the like described in an embodiment of the present invention;

[0020] Figure 6 It is a cross-sectional view of the box body, shell, and water tank described in the implementation mode of this scheme;

[0021] Figure 7 It is a schematic diagram of the box and the shell described in the implementation mode of this scheme;

[0022] Figure 8 It is a partial cross-sectional view of the water tank described in the implementation mode of this scheme.

[0023] Description of Reference Numerals

[0024] 1-power end, 2-cylinder body, 3-pump head, 4-first one-way valve, 5-second one-way valve, 6-plunger, 7-sealing packing, 8-sealing member, 9-first accommodating space, 10-liquid inlet pipe, 11-liquid outlet pipe, 12-collecting pipe, 13-buffer space, 14-connecting channel, 15-box, 16-first sealing plug, 17-connecting rod, 18-spring, 19-housing, 20-first connecting pipe, 21-cooling channel, 22- Water tank, 23-second connecting pipe, 24-second sealing plug, 25-connecting rod, 26-connecting piece, 27-pressure chamber, 28-water inlet, 29-third connecting pipe, 30-fourth connecting pipe, 31-pressure mechanism, 151-upper chamber, 152-lower chamber, 153-liquid inlet, 154-liquid outlet, 155-connecting hole, 201-limiting groove, 202-reciprocating channel, 221-water outlet, 301-medium channel. DETAILED DESCRIPTION

[0025] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0026] refer to Figure 1-Figure 8 As shown, the present scheme provides a reciprocating pump, wherein the reciprocating pump comprises a cylinder body 2 having a reciprocating channel 202, a pump head 3, a plunger 6 movably arranged in the reciprocating channel 202 and a power end 1 drivingly connected to the plunger 6, one end of the cylinder body 2 is perpendicular to the side connected to the pump head 3, and two circumferentially extending limiting grooves 201 are axially spaced on the inner circumferential surface of the cylinder body 2, and each of the limiting grooves 201 is provided with a sealing filler 7 surrounding and engaged with the plunger 6.

[0027] The power end 1 can use a hydraulic cylinder as a power source, or alternatively use a torque output member such as an electric motor, an engine, a hydraulic motor, etc. as a power source, and convert the torque into a linear reciprocating driving force through a transmission component.

[0028] The reciprocating channel 202 of the cylinder body 2 can accommodate the plunger 6 to reciprocate therein under the drive of the power end 1. When the plunger 6 reciprocates along the length direction of the cylinder body 2, it also reciprocates and inserts into and leaves the pump head 3, causing the pressure therein to change, thereby driving the medium to flow in the pump head 3.

[0029] Among them, two limiting grooves 201 are arranged on the inner circumferential surface of the cylinder body 2, and the limiting grooves 201 can at least partially accommodate the sealing filler 7. The sealing filler 7 is an annular structure, which surrounds the outer circumference of the plunger 6 and is sealingly engaged with the outer circumferential surface of the plunger 6, so as to form a seal between the cylinder body 2 and the plunger 6.

[0030] The two seals formed by the sealing packing 7 can prevent or reduce the medium in the pump head 3 from entering between the plunger 6 and the cylinder body 2, thereby preventing or reducing the wear between the plunger 6 and the cylinder body 2 caused by the medium; in addition, the limiting groove 201 can limit the sealing packing 7 from being driven by the plunger 6 and moving axially relative to the cylinder body 2, so that the sealing packing 7 can be stably maintained in a predetermined position to ensure the sealing effect.

[0031] In this solution, the sealing packing located in the limit groove can prevent the sealing packing from moving under the influence of the reciprocating movement of the plunger, thereby ensuring the sealing effect, preventing or reducing the medium transported in the pump head from entering between the plunger and the cylinder body, and reducing the wear of the plunger and the cylinder body.

[0032] The sealing packing 7 includes a main body and two annular sealing members 8 axially spaced apart and arranged on the inner circumference of each end of the main body. Figure 4 As shown, the sealing filler 7 includes an annular main body, and two annular seals 8 are respectively provided at both ends of the main body. The two seals 8 are axially spaced from each other, and the two seals 8 can be sealingly engaged with the outer peripheral surface of the plunger 6 to achieve sealing.

[0033] Further, in each of the sealing packings 7, the distance between the two sealing members 8 gradually increases in the radial inward direction; and / or, in each of the sealing packings 7, the radial inner ends of the two sealing members 8 are inclined toward the axial outer side. Figure 4As shown, the spacing between the two seals 8 at each axial end of the sealing packing 7 gradually increases in the radial direction (radial direction of the cylinder body 2) inward; additionally or alternatively, the two seals 8 are axially inclined outward, for example, the radial inner end of the seal 8 on the left is inclined to the left, and the radial inner end of the seal 8 on the right is inclined to the right. Such a structural design can effectively prevent the sealing packing 7 from moving axially with the plunger 6 when the plunger 6 moves back and forth.

[0034] The cylinder 2 is provided with a plurality of accommodating spaces 9 surrounding the plunger 6, and the reciprocating pump comprises a liquid inlet pipe 10 connected to the cylinder 2, a liquid outlet pipe 11, a box 15 for accommodating a cooling medium, and a collecting pipe 12 connected to the liquid outlet pipe 11, wherein the collecting pipe 12 and the liquid inlet pipe 10 are respectively connected to the box 15. Figure 3 As shown, the accommodating space 9 is arranged around the plunger 6, and a cooling medium can be accommodated therein to cool and reduce the temperature of the plunger 6. The liquid inlet pipe 10 is connected to the cylinder body 2 and communicates with the accommodating space 9, and the liquid outlet pipe 11 is connected to the cylinder body 2 and communicates with the accommodating space 9. The cooling medium can be injected into the accommodating space 9 through the liquid inlet pipe 10, and the cooling medium can be discharged through the liquid outlet pipe 11. In addition, referring to Figure 1 As shown, the housing 15 is connected to a plurality of liquid outlet pipes 11 through a collecting pipe 12, and the collecting pipe 12 collects the plurality of liquid outlet pipes 11 together and transports the cooling medium to the housing 15. In addition, the reciprocating pump may include a plurality of cylinders 2, and the liquid outlet pipes 11 on different cylinders 2 are collected through the collecting pipe 12. The liquid inlet pipe 10 may be directly or indirectly connected to the housing 15, which will be further described below.

[0035] In addition, the cylinder body 2 is provided with a plurality of buffer spaces 13 communicating with the accommodation space 9 and a connecting channel 14 communicating with the plurality of buffer spaces 13. Figure 5 As shown, a buffer space 13 is provided in the cylinder body 2, which is connected to the accommodating space 9. When the pressure in the accommodating space 9 is too high, the cooling medium can enter the buffer space 13, and when the pressure is reduced, the cooling medium can return from the buffer space 13 to the accommodating space 9. Multiple buffer spaces 13 can be provided and connected through a connecting channel 14.

[0036] The housing 15 is provided with an upper chamber 151, a lower chamber 152, a connecting hole 155 connecting the upper chamber 151 and the lower chamber 152, a liquid outlet 154 connecting the upper chamber 151, a liquid inlet 153 connecting the lower chamber 152, and a first sealing plug 16 inserted into the connecting hole 155, wherein the liquid inlet 153 is connected to the collecting pipe 12, the liquid outlet 154 is connected to the liquid inlet pipe 10, and the first sealing plug 16 can be moved upward to open the connecting hole. Figure 6As shown, the box body 15 is provided with an upper chamber 151 and a lower chamber 152, which are separated by a partition, and a connecting hole 155 is provided on the partition. The first sealing plug 16 can be inserted into the connecting hole 155, and can move upward under the pressure of the lower chamber 152, thereby disengaging from the connecting hole 155, so that the upper chamber 151 and the lower chamber 152 are connected. The cooling medium in the collecting pipe 12 enters the lower chamber 152. When the cooling medium in the lower chamber 152 accumulates to a certain amount, the first sealing plug 16 can be pushed upward to open the connecting hole 155, and the cooling medium enters the upper chamber 151, and is discharged through the liquid outlet 154, and directly or indirectly enters the liquid inlet pipe 10.

[0037] In addition, the reciprocating pump includes a first connecting pipe 20, a housing 19 having a cooling channel 21 disposed therein, and a cooling mechanism for injecting cooling water into the cooling channel 21. The first connecting pipe 20 is partially accommodated in the cooling channel 21, and the two ends of the first connecting pipe 20 are respectively connected to the liquid outlet 154 and the liquid inlet pipe 10. Figure 6 As shown, a cooling channel 21 is formed in the housing 19, and the first connecting pipe 20 is partially arranged in the cooling channel 21. The cooling medium discharged from the liquid outlet 154 enters the first connecting pipe 20. The cooling mechanism can inject cooling water into the cooling channel 21 to cool the first connecting pipe 20 therein, so that the cooling medium in the first connecting pipe 20 is cooled, and then the cooling medium in the first connecting pipe 20 enters the liquid inlet pipe 10 and further enters the accommodating space 9 to achieve cooling of the plunger 6. The housing 19 is formed with an inlet and an outlet of the cooling channel 21 to inject and discharge cooling water.

[0038] The cooling mechanism comprises a water tank 22, a second connecting pipe 23, a second sealing plug 24, a connecting rod 25 and a connecting piece 26. A water outlet 221 is provided at the bottom of the water tank 22. Both ends of the second connecting pipe 23 are respectively connected to the water outlet 221 and the cooling channel 21. The second sealing plug 24 is provided in the water outlet 221. The first sealing plug 16 is connected to a connecting rod 17 extending to the outside of the box body (15). The connecting rod 25 is connected to the second sealing plug 24. The connecting rod 25 and the connecting rod 17 are connected via the connecting piece 26. A spring 18 is provided between the box body 15 and the first sealing plug 16. Figure 6 and Figure 8As shown, a water outlet 221 is provided at the bottom of the water tank 22, which is connected to the cooling channel 21 of the shell 19 through a second connecting pipe 23. A second sealing plug 24 is provided in the water outlet 221, and the second sealing plug 24 is connected to the connecting rod 17 through a connecting rod 25 and a connecting piece 26. When the first sealing plug 16 moves upward, it can drive the second sealing plug 24 to move upward as well, so as to open the water outlet 221 and allow the cooling water in the water tank 22 to enter the cooling channel 21. This allows the cooling water in the water tank 22 to enter the cooling channel 21 when the cooling medium flows from the box body 15 to the first connecting pipe 20, so as to cool the first connecting pipe 20.

[0039] In this solution, a cooling medium capable of evaporation may be provided in the accommodation space 9 and the housing 15. The liquid cooling medium absorbs the heat of the plunger 6 in the accommodation space 9 and evaporates. The gaseous cooling medium enters the lower chamber 152 to open the connecting hole 155 and further enters the first connecting pipe 20. The gaseous cooling medium is cooled by the cooling water in the cooling channel 21 in the first connecting pipe 20 and condensed into a liquid state, and further returns to the accommodation space 9. When the gaseous cooling medium in the accommodation space 9 is discharged and replaced by a liquid state, the pressure therein decreases, and accordingly, the pressure in the lower chamber 152 also decreases, the first sealing plug 16 moves downward to re-block the connecting hole 155, the second sealing plug 24 also descends to re-block the water outlet 221, the cooling medium in the liquid inlet pipe 10 stops being supplied to the accommodation space 9, and the cooling water in the water tank 22 also stops being supplied to the cooling channel 21.

[0040] In addition, a pressure chamber 27 located between the cylinder body 2 and the plunger 6 is provided between the sealing packing 7 relatively close to the pump head 3 and the pump head 3, and a water inlet hole 28 communicating with the pressure chamber 27 is provided on the cylinder body 2. The reciprocating pump includes a pressure mechanism 31, a third connecting pipe 29 connected between the pressure mechanism 31 and the water tank 22, and a fourth connecting pipe 30 connected between the pressure mechanism 31 and the water inlet hole 28. Figure 3 As shown, the pressure chamber 27 is arranged between the sealing packing 7 near the pump head 3 and the pump head 3, and is arranged around the plunger 6. The pressure mechanism 31 can inject the water in the water tank 22 into the pressure chamber 27 through the third connecting pipe 29, the fourth connecting pipe 30, and the water inlet hole 28, and the sealing between the plunger 6 and the cylinder body 2 is realized by water, so as to prevent the medium in the pump head 3 from entering between the cylinder body 2 and the plunger 6, and further improve the sealing effect. The pressure mechanism 31 can be a pressure pump.

[0041] The pump head 3 has a medium channel 301, and a first one-way valve 4 and a second one-way valve 5 are respectively disposed at both ends of the medium channel 301. Figure 2As shown, a medium channel 301 is provided in the pump head 3, and the extension direction of the medium channel 301 is roughly perpendicular to the extension direction of the reciprocating channel 202. The plunger 6 can move back and forth and partially enter the medium channel 301, thereby changing the pressure therein; a first one-way valve 4 and a second one-way valve 5 are respectively provided at both ends of the medium channel 301. When the plunger 6 moves to the right and enters the medium channel 301, the pressure in the medium channel 301 increases, the first one-way valve 4 opens and the second one-way valve 5 closes, and the medium in the medium channel 301 is discharged through the first one-way valve 4. When the plunger 6 moves to the left and leaves the medium channel 301, the pressure in the medium channel 301 decreases, the first one-way valve 4 closes and the second one-way valve 5 opens, and the external medium enters the medium channel 301 through the second one-way valve 5; the reciprocating movement of the plunger 6 can make the medium flow from bottom to top through the medium channel 301, thereby realizing the medium transportation.

[0042] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various specific technical features in any suitable manner. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations. However, these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A reciprocating pump, characterized in that: The reciprocating pump comprises a cylinder body (2) having a reciprocating channel (202), a pump head (3), a plunger (6) movably arranged in the reciprocating channel (202), and a power end (1) drivingly connected to the plunger (6), one end of the cylinder body (2) being perpendicular to the side connected to the pump head (3), two circumferentially extending limiting grooves (201) being axially spaced apart on the inner circumferential surface of the cylinder body (2), and each of the limiting grooves (201) being provided with a sealing filler (7) surrounding and engaging with the plunger (6).

2. The reciprocating pump according to claim 1, characterized in that: The sealing packing (7) comprises a main body and two annular sealing members (8) arranged axially spaced apart on the inner circumferential surface of each end of the main body.

3. The reciprocating pump according to claim 2, characterized in that: In each of the sealing packings (7), the distance between the two sealing members (8) gradually increases in the radially inward direction; And / or, in each of the sealing packings (7), the radial inner ends of the two sealing elements (8) are inclined toward the axial outer sides.

4. The reciprocating pump according to claim 1, characterized in that: The cylinder body (2) is provided with a plurality of accommodating spaces (9) surrounding the plunger (6); the reciprocating pump comprises a liquid inlet pipe (10) connected to the cylinder body (2), a liquid outlet pipe (11), a box body (15) accommodating a cooling medium, and a collecting pipe (12) connected to the liquid outlet pipe (11); the collecting pipe (12) and the liquid inlet pipe (10) are respectively connected to the box body (15).

5. The reciprocating pump according to claim 4, characterized in that: The cylinder body (2) is provided with a plurality of buffer spaces (13) communicating with the accommodating space (9) and a connecting channel (14) communicating with the plurality of buffer spaces (13).

6. The reciprocating pump according to claim 4, characterized in that The housing (15) is provided with an upper chamber (151), a lower chamber (152), a connecting hole (155) connecting the upper chamber (151) and the lower chamber (152), a liquid outlet hole (154) connecting to the upper chamber (151), a liquid inlet hole (153) connecting to the lower chamber (152), and a first sealing plug (16) inserted into the connecting hole (155), wherein the liquid inlet hole (153) is connected to the collecting pipe (12), the liquid outlet hole (154) is connected to the liquid inlet pipe (10), and the first sealing plug (16) is capable of moving upward to open the connecting hole.

7. The reciprocating pump according to claim 6, characterized in that The reciprocating pump comprises a first connecting pipe (20), a housing (19) provided with a cooling channel (21) therein, and a cooling mechanism for injecting cooling water into the cooling channel (21); the first connecting pipe (20) is partially accommodated in the cooling channel (21); and two ends of the first connecting pipe (20) are respectively connected to the liquid outlet (154) and the liquid inlet pipe (10).

8. The reciprocating pump according to claim 7, characterized in that The cooling mechanism comprises a water tank (22), a second connecting pipe (23), a second sealing plug (24), a connecting rod (25) and a connecting piece (26); a water outlet (221) is provided at the bottom of the water tank (22); two ends of the second connecting pipe (23) are respectively connected to the water outlet (221) and the cooling channel (21); the second sealing plug (24) is arranged in the water outlet (221); the connecting rod (25) is connected to the second sealing plug (24); the first sealing plug (16) is connected to a connecting rod (17) extending to the outside of the box body (15); the connecting rod (25) and the connecting rod (17) are connected via the connecting piece (26); and a spring (18) is provided between the box body (15) and the first sealing plug (16).

9. The reciprocating pump according to claim 8, characterized in that A pressure chamber (27) located between the cylinder body (2) and the plunger (6) is provided between the sealing filler (7) relatively close to the pump head (3) and the pump head (3); a water inlet hole (28) communicating with the pressure chamber (27) is provided on the cylinder body (2); the reciprocating pump comprises a pressure mechanism (31), a third connecting pipe (29) connected between the pressure mechanism (31) and the water tank (22), and a fourth connecting pipe (30) connected between the pressure mechanism (31) and the water inlet hole (28).

10. The reciprocating pump according to claim 1, characterized in that The pump head (3) has a medium channel (301), and a first one-way valve (4) and a second one-way valve (5) are respectively provided at both ends of the medium channel (301).

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