A plunger pump system with a cooling device

Abstract

The present invention discloses a plunger pump system with a cooling device, which includes a plunger pump body and a cooling device. The plunger pump body includes a plunger pump cylinder, a plunger, a bushing, a sealing assembly, and a cooling channel. The plunger pump cylinder is provided with a cooling channel; the cooling device includes a liquid storage tank, a circulating pump, and a heat exchanger; the circulating pump includes a volute, an impeller, and a rotating shaft, and the impeller includes a rear cover plate, a front cover plate, blades, and a balancing hole; the characteristic is that a balancing jet device is installed in the balancing hole, and the balancing jet device is used to make the high-pressure liquid on the back pressure side of the impeller flow back into the impeller cavity through the balancing jet device, and the jet angle of the balancing jet device is adjustable. In addition to being able to balance the axial force, the circulating pump of the present invention can also reduce the secondary flow and flow loss at the blade inlet, thereby improving the hydraulic performance and efficiency of the circulating pump, thereby being able to efficiently cool the plunger pump cylinder, and improving the operating stability and service life of the plunger pump.

Description

Technical Field

[0001] The invention relates to the technical field of plunger pumps, and in particular to a plunger pump system with a cooling device. Background Art

[0002] The existing plunger pump system includes a plunger pump body and a cooling device. The plunger pump body includes a plunger pump cylinder, a plunger, a bushing, a sealing assembly, and a cooling channel. A bushing and a sealing assembly are installed between the plunger and the plunger pump cylinder. A cooling channel is arranged in the plunger pump cylinder. The cooling channel has a first liquid inlet and a first liquid outlet. The sealing assembly is connected to a second liquid inlet and a second liquid outlet; the cooling device includes a first liquid storage tank, a first circulating pump, a first heat exchanger, and a first pipeline. One end of the first pipeline is connected to the first liquid inlet, and the other end is connected to the first liquid outlet. The first pipeline is connected to the first liquid storage tank, the first circulating pump, the first heat exchanger, and a control valve.

[0003] The first circulation pump includes a volute, an impeller, and a rotating shaft. The impeller is rotatably installed in the volute, and the impeller is installed on the rotating shaft. The impeller includes a rear cover plate, a front cover plate, blades, and a balancing hole. A plurality of blades evenly distributed along the circumference are connected between the rear cover plate and the front cover plate, and a plurality of balancing holes evenly distributed along the circumference are opened on the rear cover plate. However, the cooling device of the existing plunger pump system still has the problems of low hydraulic performance and efficiency of the circulation pump, small flow rate and low flow rate stability, and the cooling effect and service life of the plunger pump need to be further improved. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a plunger pump system with a cooling device. In addition to being able to balance the axial force, the circulating pump of the present invention can also reduce the secondary flow and flow loss at the blade inlet, thereby improving the hydraulic performance and efficiency of the circulating pump. It has the advantages of large flow and stable flow, so that the plunger pump cylinder can be efficiently cooled, the cooling effect of the plunger pump can be improved, and the operating stability and service life of the plunger pump can be improved.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A plunger pump system with a cooling device, comprising a plunger pump body and a cooling device, wherein the plunger pump body comprises a plunger pump cylinder, a plunger, a bushing, a sealing assembly, and a cooling channel, wherein a bushing and a sealing assembly are installed between the plunger and the plunger pump cylinder, wherein a cooling channel is arranged in the plunger pump cylinder, wherein the cooling channel has a first liquid inlet and a first liquid outlet, wherein the sealing assembly is connected to a second liquid inlet and a second liquid outlet; wherein the cooling device comprises a first liquid storage tank, a first circulating pump, a first heat exchanger, and a first pipeline, wherein one end of the first pipeline is connected to the first liquid inlet, and the other end is connected to the first liquid outlet, wherein the first pipeline is connected to There are a first liquid storage tank, a first circulation pump, a first heat exchanger, and a control valve; the first circulation pump includes a volute, an impeller, and a rotating shaft. The impeller is rotatably installed in the volute, and the impeller is installed on the rotating shaft. The impeller includes a rear cover plate, a front cover plate, blades, and a balancing hole. A plurality of blades evenly distributed along the circumference are connected between the rear cover plate and the front cover plate, and a plurality of balancing holes evenly distributed along the circumference are opened on the rear cover plate; it is characterized in that: a balancing jet device is installed in the balancing hole, and the balancing jet device is used to make the high-pressure liquid on the back pressure side of the impeller flow back into the impeller cavity through the balancing jet device, and the jet angle of the balancing jet device is adjustable.

[0007] Furthermore, the balanced jet device includes a gear, a gear ring, a balanced jet hole, and a barrel portion, wherein a plurality of gears are respectively installed in a plurality of balanced holes, the gear has an external tooth portion, the gear ring has an internal tooth portion, and the plurality of gears and the gear ring are connected through meshing tooth portions. A barrel portion is provided at the left end of the gear, and the barrel portion is embedded in the balanced hole. A balanced jet hole is provided in the barrel portion, and the axis of the balanced jet hole is inclined relative to the rotation axis of the impeller, and the inclination angle is 5°-60°.

[0008] Furthermore, the outer circumferential surface of the gear ring is connected to the first bearing, the outer circumferential surface of the first bearing is fixedly connected to the inner circumferential surface of the sealing ring arranged on the outer side surface of the rear cover plate, the gear ring is provided with one or more first threaded holes distributed along the circumferential direction, the outer side surface of the rear cover plate is provided with one or more second threaded holes, and the threaded connectors are respectively connected to the first threaded holes and the second threaded holes.

[0009] Furthermore, the balanced jet hole is arranged radially inward of the leading edge of the blade, and the jet liquid returning through the balanced jet hole is returned and ejected from the root position of the leading edge of the blade and merges into the mainstream of the impeller cavity.

[0010] Furthermore, a reflux channel is provided in the gear, the reflux channel is connected to the balanced jet hole, the inlet section of the reflux channel is a conical hole, the conical hole has a converging function, and the aperture of the reflux channel is larger than the aperture of the balanced jet hole.

[0011] Furthermore, a guide vane is arranged on the right end face of the gear, a plurality of guide vanes are evenly distributed along the circumferential direction, and a radial inner end of the guide vane is arranged as an inclined edge.

[0012] Furthermore, a second bearing is installed in the balancing hole, and a cylindrical portion is provided on the inner periphery of the second bearing.

[0013] Furthermore, the first bearing and the second bearing are sleeve-type bearings; the axial thickness of the gear ring is equal to that of the first bearing and is smaller than the axial thickness of the barrel.

[0014] Furthermore, the outer tooth portion of the gear is a helical tooth, and the inner tooth portion of the gear ring is a helical tooth. The helical tooth meshing connection can limit the axial displacement of the gear without the need for an additional axial limiter.

[0015] Further, in the circumferential direction, the plurality of balancing jet holes and the plurality of blades are alternately arranged at intervals.

[0016] The plunger pump system with a cooling device of the present invention can adjust the inclination angle of the balancing jet hole at the factory or on site according to the operating conditions (flow rate, pressure) of the circulating pump. The inclination angle of the balancing jet hole is adjusted by rotating the gear ring to drive multiple gears to rotate. After the inclination angle of the balancing jet hole is adjusted, the threaded connection is respectively corresponding to the first threaded hole and the second threaded hole through the threaded connection piece to fix the gear ring and the gear; the jet liquid returning through the balancing jet hole is returned and ejected from the root position of the leading edge of the blade and merged into the mainstream of the impeller cavity. In addition to being able to balance the axial force, the circulating pump of the present invention can also reduce the secondary flow and flow loss at the blade inlet, thereby improving the hydraulic performance and efficiency of the circulating pump, and has the advantages of large flow and stable flow, so that the plunger pump cylinder can be efficiently cooled, the cooling effect of the plunger pump is improved, and the operating stability and service life of the plunger pump are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the cooling device of the plunger pump system of the present invention;

[0018] Figure 2 A schematic diagram of the structure of a circulating pump of the cooling device of the present invention;

[0019] Figure 3 It is a partial enlarged structural schematic diagram of a circulation pump of the cooling device of the present invention;

[0020] Figure 4 The figure is a schematic diagram of the structure of the circulating pump impeller of the cooling device of the present invention.

[0021] In the figure: plunger pump cylinder 1, plunger 2, bushing 3, sealing assembly 4, cooling channel 5, first liquid storage tank 6, first circulation pump 7, first heat exchanger 8, second liquid storage tank 9, second circulation pump 10, second heat exchanger 11; volute 71, impeller 72, rear cover plate 721, front cover plate 722, blade 723, rotating shaft 73, balancing hole 74, balanced jet device 75, gear 751, gear ring 752, balanced jet hole 753, first bearing 754, meshing tooth portion (helical tooth) 755, second bearing 756, barrel portion 757, reflux channel 758, guide vane 759, threaded connector 7510. DETAILED DESCRIPTION

[0022] In order to make the technical solution and advantages of the present invention clearer, the technical solution of the present invention will be further described in detail in detail with reference to the accompanying drawings. It can be understood that the specific embodiments described here are only partial embodiments of the present invention, which are only used to explain the present invention, not to limit the present invention. It should be noted that, for the convenience of description, only the parts / structures related to the present invention are shown in the accompanying drawings, and other related parts can refer to the general design. In the absence of conflict, the embodiments of the present invention and the technical features in the embodiments can be combined with each other to obtain new embodiments.

[0023] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. In addition, unless otherwise defined, the technical terms or scientific terms used in the description of the present invention should be the common meanings understood by ordinary technicians in the field to which the present invention belongs.

[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0025] like Figure 1-4As shown, a plunger pump system with a cooling device includes a plunger pump body and a cooling device. The plunger pump body includes a plunger pump cylinder 1, a plunger 2, a bushing 3, a sealing assembly 4, and a cooling channel 5. The bushing 3 and the sealing assembly 4 are installed between the plunger 2 and the plunger pump cylinder 1. The bushing 3 and the sealing assembly 4 are separately arranged along the axial direction of the plunger 2. The cooling channel 5 is arranged in the plunger pump cylinder 1. The cooling channel 5 has a first liquid inlet and a first liquid outlet. The sealing assembly 4 is connected to a second liquid inlet and a second liquid outlet; the cooling device includes a first liquid storage Box 6, a first circulation pump 7, a first heat exchanger 8, a first pipeline, a second liquid storage tank 9, a second circulation pump 10, a second heat exchanger 11, and a second pipeline. One end of the first pipeline is connected to the first liquid inlet, and the other end is connected to the first liquid outlet. The first pipeline is connected with the first liquid storage tank 6, the first circulation pump 7, the first heat exchanger 8, and a control valve; one end of the second pipeline is connected to the second liquid inlet, and the other end is connected to the second liquid outlet. The second pipeline is connected with the second liquid storage tank 9, the second circulation pump 10, the second heat exchanger 11, and a control valve.

[0026] The first circulation pump 7 or the second circulation pump 10 includes a volute 71, an impeller 72, and a rotating shaft 73. The impeller 72 is rotatably installed in the volute 71. The impeller 72 is installed on the rotating shaft 73. The impeller 72 includes a rear cover plate 721, a front cover plate 722, blades 723, and a balancing hole 74. A plurality of blades 723 evenly distributed along the circumference are connected between the rear cover plate 721 and the front cover plate 722. A plurality of balancing holes 74 evenly distributed along the circumference are opened on the rear cover plate 721; it is characterized in that: a balancing jet device 75 is installed in the balancing hole 74, and the balancing jet device 75 is used to make the high-pressure liquid on the back pressure side of the impeller 72 flow back to the impeller cavity through the balancing jet device 75, and the jet angle of the balancing jet device 75 is adjustable.

[0027] Furthermore, the balanced jet device 75 includes a gear 751, a gear ring 752, a balanced jet hole 753, and a barrel portion 757. Multiple gears 751 are respectively installed in multiple balanced holes 74. The gear 751 has an external tooth portion, and the gear ring 752 has an internal tooth portion. Multiple gears 751 and the gear ring 752 are connected through meshing tooth portions 755. A barrel portion 757 is provided at the left end of the gear 751. The barrel portion 757 is embedded in the balanced hole 74. A balanced jet hole 753 is opened in the barrel portion 757. The axis of the balanced jet hole 753 is inclined relative to the rotation axis of the impeller 72, such as at an inclination angle of 10°-50°.

[0028] The outer circumference of the gear ring 752 is connected to the first bearing 754, and the outer circumference of the first bearing 754 is fixedly connected to the inner circumference of the sealing ring arranged on the outer side of the rear cover plate 721. The gear ring 752 is provided with one or more first threaded holes distributed along the circumferential direction, and the outer side of the rear cover plate 721 is provided with one or more second threaded holes, and the threaded connector 7510 is respectively connected to the first threaded hole and the second threaded hole.

[0029] The balanced jet hole 753 is arranged radially inward of the leading edge of the blade 723 , and the jet liquid returning through the balanced jet hole 753 is returned and ejected from the root position of the leading edge of the blade 723 and merges into the mainstream of the impeller cavity.

[0030] The plunger pump system with a cooling device of the present invention can adjust the inclination angle of the balanced jet hole 753 at the factory or on site according to the operating conditions (flow rate, pressure) of the circulating pump, and the inclination angle of the balanced jet hole 753 can be adjusted by rotating the gear ring 752 to drive the plurality of gears 751 to rotate, and after the inclination angle of the balanced jet hole 753 is adjusted, the threaded connection 7510 is respectively threadedly connected with the first threaded hole and the second threaded hole to fix the gear ring 752 and the gear 751; the jet liquid refluxed through the balanced jet hole 753 is refluxed and ejected from the root position of the leading edge of the blade 723 and merged into the mainstream of the impeller cavity. In addition to being able to balance the axial force, the circulating pump of the present invention can also reduce the secondary flow and flow loss at the inlet of the blade 723, thereby improving the hydraulic performance and efficiency of the circulating pump, and has the advantages of large flow rate and stable flow rate, so that the plunger pump cylinder 1 can be efficiently cooled, the cooling effect of the plunger pump is improved, and the operating stability and service life of the plunger pump are improved.

[0031] A reflux channel 758 is provided in the gear 751 , and the reflux channel 758 is connected to the balanced jet hole 753 . The inlet section of the reflux channel 758 is a conical hole, and the conical hole has the function of converging / collecting flows. The aperture of the reflux channel 758 is larger than the aperture of the balanced jet hole 753 .

[0032] In one embodiment, a guide vane 759 is disposed on the right end face of the gear 751. The guide vanes 759 are evenly distributed along the circumferential direction, and the radial inner end of the guide vane 759 is disposed as an inclined edge. The present invention can promote the return liquid to flow into the return channel 758 and increase the flow rate of the liquid in the balanced jet hole 753 by disposing the guide vane 759.

[0033] A second bearing 756 is installed in the balancing hole 74 , and a cylindrical portion 757 is provided on the inner periphery of the second bearing 756 .

[0034] In one embodiment, the first bearing 754 and the second bearing 756 are bushing bearings, sliding bearings or rolling bearings; the axial thickness of the gear ring 752 is equal to that of the first bearing 754 and is smaller than the axial thickness of the barrel portion 757 .

[0035] In one embodiment, the outer teeth of the gear 751 are helical teeth, and the inner teeth of the gear ring 752 are helical teeth. The axial displacement of the gear 751 can be limited by the helical tooth meshing connection / transmission without the need for additional axial limiters.

[0036] In the circumferential direction, the plurality of balanced jet holes 753 and the plurality of blades 723 are alternately arranged at intervals, such as Figure 4 shown.

[0037] The plunger pump system with a cooling device of the present invention can adjust the inclination angle of the balanced jet hole 753 at the factory or on site according to the operating conditions (flow rate, pressure) of the circulating pump, and the inclination angle of the balanced jet hole 753 can be adjusted by rotating the gear ring 752 to drive the plurality of gears 751 to rotate, and after the inclination angle of the balanced jet hole 753 is adjusted, the threaded connection 7510 is respectively threadedly connected with the first threaded hole and the second threaded hole to fix the gear ring 752 and the gear 751; the jet liquid refluxed through the balanced jet hole 753 is refluxed and ejected from the root position of the leading edge of the blade 723 and merged into the mainstream of the impeller cavity. In addition to being able to balance the axial force, the circulating pump of the present invention can also reduce the secondary flow and flow loss at the inlet of the blade 723, thereby improving the hydraulic performance and efficiency of the circulating pump, and has the advantages of large flow rate and stable flow rate, so that the plunger pump cylinder 1 can be efficiently cooled, the cooling effect of the plunger pump is improved, and the operating stability and service life of the plunger pump are improved.

[0038] The above-mentioned implementation modes are for explanation of the present invention rather than limitation of the present invention. It can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A plunger pump system with a cooling device, comprising a plunger pump body and a cooling device, wherein the plunger pump body comprises a plunger pump cylinder (1), a plunger (2), a bushing (3), a sealing assembly (4), and a cooling channel (5), wherein a bushing and a sealing assembly are installed between the plunger and the plunger pump cylinder, wherein a cooling channel is arranged in the plunger pump cylinder, wherein the cooling channel has a first liquid inlet and a first liquid outlet, and wherein the sealing assembly is connected to a second liquid inlet and a second liquid outlet; wherein the cooling device comprises a first liquid storage tank (6), a first circulating pump (7), a first heat exchanger (8), a first pipeline, and the first pipeline One end is connected to the first liquid inlet, and the other end is connected to the first liquid outlet. The first pipeline is connected to a first liquid storage tank, a first circulation pump, a first heat exchanger, and a control valve. The first circulation pump (7) comprises a volute (71), an impeller (72), and a rotating shaft (73). The impeller is rotatably mounted in the volute. The impeller is mounted on the rotating shaft. The impeller comprises a rear cover plate (721), a front cover plate (722), blades (723), and a balancing hole (74). A plurality of blades evenly distributed along the circumference are connected between the rear cover plate and the front cover plate. A plurality of balancing holes evenly distributed along the circumference are provided on the rear cover plate. Features: A balanced jet device (75) is installed in the balancing hole (74), and is used to allow high-pressure liquid on the back pressure side of the impeller to flow back into the impeller cavity through the balanced jet device, and the jet angle of the balanced jet device is adjustable; the balanced jet device (75) comprises a gear (751), a gear ring (752), a balanced jet hole (753), and a barrel portion (757); a plurality of gears are respectively installed in the plurality of balancing holes (74); the gear has an external tooth portion, the gear ring has an internal tooth portion, and the plurality of gears and the gear ring are connected via meshing tooth portions (755); a barrel portion is provided at the left end of the gear, and the barrel portion is embedded in the balancing hole, a balanced jet hole is provided in the barrel portion, and the axis of the balanced jet hole is inclined relative to the rotation axis of the impeller, and the inclination angle is 5°-60°.

2. A plunger pump system with a cooling device as claimed in claim 1, characterized in that: The outer circumferential surface of the gear ring (752) is connected to the first bearing (754), and the outer circumferential surface of the first bearing is fixedly connected to the inner circumferential surface of a sealing ring arranged on the outer side surface of the rear cover plate (721). The gear ring is provided with one or more first threaded holes distributed along the circumferential direction, and the outer side surface of the rear cover plate is provided with one or more second threaded holes. The threaded connectors (7510) are respectively connected to the first threaded holes and the second threaded holes.

3. A plunger pump system with a cooling device as claimed in claim 2, characterized in that: The balanced jet hole (753) is arranged on the radial inner side of the leading edge of the blade (723), and the jet liquid returning through the balanced jet hole is ejected from the root position of the leading edge of the blade and merges into the main flow of the impeller cavity.

4. A plunger pump system with a cooling device as claimed in claim 3, characterized in that: A reflux channel (758) is provided in the gear (751), the reflux channel is connected to the balanced jet hole (753), the inlet section of the reflux channel is a tapered hole, the tapered hole has a converging function, and the aperture of the reflux channel is larger than the aperture of the balanced jet hole.

5. A plunger pump system with a cooling device as claimed in claim 4, characterized in that: The right end surface of the gear (751) is provided with a guide vane (759), wherein the plurality of guide vanes are evenly distributed along the circumferential direction, and the radial inner end of the guide vane is provided as an inclined edge.

6. A plunger pump system with a cooling device as claimed in claim 5, characterized in that: A second bearing (756) is installed in the balancing hole (74), and a cylindrical portion (757) is provided on the inner periphery of the second bearing.

7. A plunger pump system with a cooling device as claimed in claim 5, characterized in that: The first bearing (754) and the second bearing (756) are sleeve-type bearings; the axial thickness of the gear ring (752) is equal to that of the first bearing, and is smaller than the axial thickness of the barrel portion (757).

8. A plunger pump system with a cooling device as claimed in claim 5, characterized in that: The outer tooth portion of the gear (751) is a helical tooth, and the inner tooth portion of the gear ring (752) is a helical tooth. The helical tooth meshing connection can limit the axial displacement of the gear without the need for an additional axial limiter.

9. A plunger pump system with a cooling device as claimed in claim 5, characterized in that: In the circumferential direction, the plurality of balancing jet holes (753) and the plurality of blades (723) are arranged alternately and at intervals.

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