Variable stroke dual cavity plunger pump

Abstract

The present application relates to the technical field of plunger pump, in particular to a variable stroke double cavity plunger pump, which comprises a shell and a driving motor, two delivery pipes are arranged in the shell, two groups of crankshaft assemblies are arranged on the output shaft of the driving motor, the shell is connected with the corresponding delivery pipe through the crankshaft assembly, and a first one-way valve and a second one-way valve are symmetrically arranged in the delivery pipe along the axis of the crankshaft assembly; the one-way valve comprises a reset assembly, a sealing assembly and a clamping assembly arranged in sequence from top to bottom, the sealing of the sealing assembly is realized by the elastic extension of the reset assembly and the adhesion of the clamping assembly; the sealing assembly on the first one-way valve is provided with a first negative pressure assembly, the sealing assembly on the second one-way valve is provided with a second negative pressure assembly, and the first negative pressure assembly and the second negative pressure assembly are oppositely arranged; by arranging the negative pressure disc and the connecting pipe, the stress area of the sealing ball under the negative pressure condition is increased, the opening speed is accelerated, and the fluid passing efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of plunger pump technology, and more specifically, to a variable stroke dual-chamber plunger pump. Background Technology

[0002] Piston pumps are often used in energy-saving appliances; a piston pump is a common positive displacement hydraulic pump that uses the reciprocating motion of a piston within a cylinder to draw in and discharge liquid. The working principle of a piston pump is based on the periodic reciprocating motion of the piston within the cylinder. When the piston is pulled outward, a negative pressure is created within the cylinder, causing liquid to be drawn in through the inlet valve; when the piston is pushed inward, it compresses the liquid and discharges it through the outlet valve. This process is repeated continuously, thus achieving continuous liquid delivery.

[0003] In existing plunger pump structures that use a ball valve body as a check valve, the working principle typically involves a spring applying a preload force to the ball, causing it to press tightly against the valve seat cavity to form a seal. When the plunger returns and creates negative pressure, the liquid pressure overcomes the spring force, lifting the ball valve and thus enabling liquid intake or discharge. However, because the ball itself has a spherical symmetrical structure, the contact between it and the valve seat is a line seal. When opening under negative pressure, the effective pressure-bearing area is limited, and the relatively smooth spherical surface can easily lead to a delayed opening response and insufficiently rapid and complete disengagement of the sealing pair. This incomplete opening restricts fluid flow capacity, thereby affecting the pump's overall suction and discharge efficiency and dynamic response performance.

[0004] Based on this, the present invention discloses a variable stroke dual-chamber piston pump. Summary of the Invention

[0005] To address the problem in the prior art where a spherical valve body is used as a check valve in a plunger pump, resulting in delayed opening response and limited flow capacity due to the spherical seal, thus affecting pumping efficiency and dynamic performance, this invention provides a variable stroke dual-chamber plunger pump. The pump includes a housing and two drive motors. Two delivery pipes are disposed within the housing. A crankshaft assembly is mounted on the output shaft of each drive motor. The housing is connected to the corresponding delivery pipe via the crankshaft assembly. A first check valve and a second check valve are symmetrically arranged along the axis of the crankshaft assembly within each delivery pipe. Each check valve includes a reset assembly, a sealing assembly, and a clamping assembly arranged sequentially from top to bottom. The sealing assembly achieves sealing through the elastic expansion and contraction of the reset assembly and the contact with the clamping assembly. The sealing assembly on the first check valve is equipped with a first negative pressure assembly, and the sealing assembly on the second check valve is equipped with a second negative pressure assembly. The first and second negative pressure assemblies are arranged opposite each other.

[0006] In order to make the suction stroke of the plunger pump variable, the output power of the plunger pump can be increased by changing the suction stroke distance while keeping the output power of the drive motor constant.

[0007] As a further improvement to this technical solution, the crankshaft assembly includes a rotating disk fixed on the output shaft of a drive motor. A plurality of cams are circumferentially fixed on the rotating disk. The cams are concentric with the rotating disk, and the distance from the outer edge of the plurality of cams to the center of the rotating disk increases sequentially. A connecting shaft is detachably mounted on one of the cams. A connecting rod is mounted on the connecting shaft. One end of the connecting rod is rotatably connected to the connecting shaft, and the other end of the connecting rod is rotatably connected to a suction rod. A pin is mounted on the connecting shaft, and the connecting rod is connected to the connecting shaft through the pin. The suction rod is slidably connected inside a suction tube, and the end of the suction tube away from the rotating disk is connected to a delivery tube.

[0008] To enable the sphere to automatically reset, the present invention employs a reset assembly including a mounting plate, on which several support rods are fixedly mounted circumferentially. The mounting plate is fixedly connected to the inner wall of the delivery pipe through the support rods. A first telescopic rod is fixedly mounted at the bottom of the mounting plate, and a reset spring is sleeved on the first telescopic rod. The sealing assembly includes a sealing ball, the top of which is connected to the first telescopic rod and the reset spring.

[0009] Based on this, in order to increase the contact area between the liquid and the sealing ball when the sealing ball is lifted, and at the same time to improve the efficiency of liquid pumping;

[0010] As a further improvement to this technical solution, the first negative pressure assembly includes a first negative pressure plate, on which several first flow ports are circumferentially formed. The first negative pressure plate is connected to the bottom of the sealing assembly on the first one-way valve. The first negative pressure assembly also includes a first connecting pipe, the top of which is fixedly connected to the bottom of the sealing ball on the first one-way valve, and the bottom of which is fixedly connected to the first negative pressure plate. The diameter of the first connecting pipe is smaller than the diameter of the bottom of the flow ports. Several interconnected first drainage grooves are circumferentially formed on both the first connecting pipe and the first negative pressure plate, and the top of the first drainage groove is connected to the bottom of the second drainage groove. Secondly, The second negative pressure assembly includes a second negative pressure plate with several circumferentially arranged second flow ports. The second negative pressure plate is connected to the top of the sealing assembly on the second one-way valve. The second negative pressure assembly also includes a second connecting pipe. The bottom of the second connecting pipe is fixedly connected to the top of the sealing ball on the second one-way valve, and the top of the second connecting pipe is fixedly connected to the second negative pressure plate. Several interconnected fifth drainage grooves are arranged circumferentially on both the second connecting pipe and the second negative pressure plate. Several fourth drainage grooves are arranged on the sealing ball on the second one-way valve and are connected to the fifth drainage grooves. The fourth drainage grooves are connected to the third drainage grooves on the second one-way valve.

[0011] In another scheme, the pressure-bearing area of ​​the sealing ball is increased by using the second negative pressure plate and the first negative pressure plate. However, when the sealing ball achieves sealing through pressure and elasticity, the sealing effect between the sealing ring and the sealing ball is limited because the sealing is traditionally achieved by hard contact between the sealing ball and the inner cavity of the corresponding delivery pipe. Even if a sealing ring is used, there is no clamping action.

[0012] As a further improvement to this technical solution, the clamping assembly includes a support plate fixed to the inner wall of the conveying pipe. The support plate has a central opening, and a sealing portion is located at the opening on the support plate. A clamping ring adapted to the sealing portion is fixed on the sealing ball, and the sealing ball is connected to the sealing portion via the clamping ring. A plurality of second drainage grooves are circumferentially formed on the bottom of the sealing ball, and a plurality of third drainage grooves corresponding one-to-one with the second drainage grooves are circumferentially formed on the clamping ring. The second drainage grooves are located within the opening, and... The top of the second drainage groove is fitted to the bottom of the opening that contacts the sealing ball; the sealing part includes an installation ring, on which a wedge-shaped ring is fixed, and a sealing ring is fixed to the top of the wedge-shaped ring; an annular receiving groove is formed around the wedge-shaped ring on the installation ring; the thickness of the sealing ring is the same as the thickness of the top of the wedge-shaped ring; the inner wall structure of the clamping ring is adapted to the wedge-shaped structure formed by the wedge-shaped ring and the sealing ring; the bottom of the clamping ring is adapted to the annular receiving groove; the inside of the wedge-shaped structure formed by the wedge-shaped ring and the sealing ring is adapted to the bottom of the sealing ball.

[0013] In another solution, since the traditional plunger pump is prone to cylinder explosion if some structures malfunction or other problems occur, causing pumping or suction issues, the present invention has designed a protective measure.

[0014] As a further improvement to this technical solution, several L-shaped guide grooves are formed inside the sealing ball around the axis of the conveying pipe. An explosion-proof component is provided at the top of the guide groove. The explosion-proof component includes a second telescopic rod, one end of which is fixedly connected to the inner wall of the top of the guide groove, and the other end of which is fixedly connected to a sealing cap. The sealing cap is located at the top of the guide groove. A strong spring is sleeved on the second telescopic rod, and the sealing cap is connected to the inner wall of the guide groove through the strong spring. The sealing cap is located above the support plate.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. In this variable stroke dual-chamber piston pump, the variable stroke crankshaft assembly is introduced to achieve flexible adjustment of the pumping stroke, thereby achieving dynamic adjustment of the output power without changing the drive speed. This structure changes the swing amplitude of the connecting rod mechanism by replacing cams of different radii, thereby adjusting the stroke length of the suction rod, so that the pumping flow rate and pressure can be flexibly controlled according to the actual working conditions, improving the adaptability and energy efficiency of the equipment.

[0017] 2. In this variable stroke dual-chamber plunger pump, by setting up a negative pressure plate, connecting pipe, and diversion groove structure, the pressure-bearing area of ​​the sealing ball under negative pressure is effectively expanded, improving the opening response speed and flow capacity. Traditional ball valves have a small pressure-bearing area and slow opening due to the spherical structure, which affects pumping efficiency. This solution, through the synergistic effect of the negative pressure plate and diversion groove, significantly increases the pressure-bearing area of ​​the sealing ball under negative pressure, resulting in a faster response and smoother flow, thereby improving suction and discharge efficiency and system dynamic response performance.

[0018] 3. In this variable stroke dual-chamber piston pump, by setting a wedge-shaped fit structure between the clamping assembly and the sealing part, active clamping and sealing between the sealing ball and the valve seat is achieved, improving sealing performance and reliability; under pressure, this structure forms an active compression through the clamping ring, wedge ring, and sealing ring, making the sealing ball and valve seat form a tighter annular sealing band, avoiding the leakage risk of traditional passive sealing, and further improving pumping efficiency and working stability.

[0019] 4. In this variable stroke dual-chamber plunger pump, by setting a flow guide groove structure with explosion-proof components inside the sealing ball, the system can automatically relieve pressure and temporarily divert flow under abnormal pressure, thereby improving equipment safety and fault response capabilities. When the pumping or suction is abnormal and causes a sudden pressure increase, the structure can release pressure and divert liquid by opening the sealing cap, preventing serious accidents such as cylinder explosion. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the internal structure of the housing of the present invention;

[0022] Figure 3 This is a schematic diagram of the crankshaft assembly of the present invention;

[0023] Figure 4 This is a cross-sectional view of the suction tube of the present invention;

[0024] Figure 5 This is a schematic diagram of the structure of the first check valve of the present invention;

[0025] Figure 6 This is a schematic diagram of the structure of the first negative pressure component of the present invention;

[0026] Figure 7 This is a cross-sectional view of the sealing ball of the present invention;

[0027] Figure 8 This is a schematic diagram of the clamping assembly of the present invention;

[0028] Figure 9 This is a schematic diagram of the sealing part of the present invention;

[0029] Figure 10 This is a cross-sectional view of the support disk of the present invention;

[0030] Figure 11 for Figure 10 Enlarged view of the structure at point A in the middle;

[0031] Figure 12 This is a schematic diagram of the structure of the second negative pressure component of the present invention;

[0032] Figure 13 This is a cross-sectional view of the structure of the second negative pressure component of the present invention.

[0033] The meanings of the labels in the diagram are as follows:

[0034] 1. Housing; 2. Drive motor; 3. Delivery pipe; 4. Crankshaft assembly; 5. Reset assembly; 6. Sealing assembly; 7. Clamping assembly; 8. First negative pressure assembly; 9. Second negative pressure assembly;

[0035] 41. Rotary disk; 42. Cam; 43. Connecting shaft; 44. Connecting rod; 45. Pin; 46. Suction rod; 47. Suction tube;

[0036] 51. Mounting plate; 52. Support rod; 53. First telescopic rod; 54. Return spring;

[0037] 61. Sealing ball; 62. Flow guide channel; 63. Explosion-proof component; 64. Second flow guide channel;

[0038] 631. Second telescopic rod; 632. Sealing cap; 633. High-strength spring;

[0039] 71. Support plate; 72. Sealing part; 73. Clamping ring; 74. Through port; 75. Third drainage groove;

[0040] 721. Mounting ring; 722. Wedge ring; 723. Sealing ring; 724. Annular receiving groove;

[0041] 81. First connecting pipe; 82. First negative pressure plate; 83. First flow port; 84. First drainage groove;

[0042] 91. Second connecting pipe; 92. Second negative pressure plate; 93. Fifth drainage groove; 94. Second flow port; 95. Fourth drainage groove. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] Existing plunger pumps use a spherical valve body as a check valve structure. However, the spherical sealing method results in a delayed opening response and limited flow capacity, which affects the improvement of pumping efficiency and dynamic performance.

[0045] Therefore, the present invention provides a variable stroke dual-chamber piston pump, see [link to relevant documentation]. Figures 1-4 As shown, it includes a housing 1 and two sets of drive motors 2. Two delivery pipes 3 are arranged inside the housing 1. A crankshaft assembly 4 is arranged on the output shaft of the drive motor 2. The housing 1 is connected to the corresponding delivery pipe 3 through the crankshaft assembly 4. A first one-way valve and a second one-way valve are symmetrically arranged inside the delivery pipe 3 along the axis of the crankshaft assembly 4. Each one-way valve includes a reset assembly 5, a sealing assembly 6 and a clamping assembly 7 arranged sequentially from top to bottom. The sealing assembly 6 achieves sealing through the elastic expansion and contraction of the reset assembly 5 and the fit with the clamping assembly 7. The sealing assembly 6 on the first one-way valve is provided with a first negative pressure assembly 8, and the sealing assembly 6 on the second one-way valve is provided with a second negative pressure assembly 9. The first negative pressure assembly 8 and the second negative pressure assembly 9 are arranged opposite to each other.

[0046] During operation, the drive motor 2 pumps through the crankshaft assembly 4, causing a reciprocating suction action in the delivery pipe 3. When a negative pressure is formed in the delivery pipe 3, the second one-way valve opens, meaning that the sealing component 6 in the second one-way valve disengages from the clamping component 7 through the second negative pressure component 9, while the first one-way valve closes, meaning that the sealing component 6 in the first one-way valve fits more tightly against the clamping component 7 through the first negative pressure component 8. The opposite occurs during subsequent output, and the reset component 5 is used to achieve reset.

[0047] For details, see Figures 2-4As shown, in order to achieve variable stroke of the plunger pump, the output power of the plunger pump can be increased by changing the stroke distance while keeping the output power of the drive motor 2 constant. Therefore, the present invention adopts a crankshaft assembly 4 including a rotating disk 41 fixed on the output shaft of the drive motor 2. Several cams 42 are fixed circumferentially on the rotating disk 41. The cams 42 are concentric with the rotating disk 41, and the distance from the outer edge of the several cams 42 to the center of the rotating disk 41 increases sequentially. A connecting shaft 43 is detachably provided on one of the cams 42. A connecting rod 44 is provided on the connecting shaft 43. One end of the connecting rod 44 is rotatably connected to the connecting shaft 43, and the other end of the connecting rod 44 is rotatably connected to a suction rod 46. A pin 45 is provided on the connecting shaft 43. The connecting rod 44 is connected to the connecting shaft 43 through the pin 45. The suction rod 46 is slidably connected in the suction pipe 47. The end of the suction pipe 47 away from the rotating disk 41 is connected to the delivery pipe 3.

[0048] During operation, the drive motor 2 drives the rotating disk 41 to rotate via the output shaft. The rotating disk 41 drives the suction rod 46 to reciprocate within the suction pipe 47 via the cam 42 and connecting rod 44 to achieve pumping. When the output speed of the drive motor 2 is constant, the pumping power needs to be adjusted. This can be achieved by changing the stroke of the suction rod 46. Specifically, since the distance from the end edge of several cams 42 to the center of the rotating disk 41 is different, it is equivalent to having several camshafts of different lengths. As needed, the connecting shaft 43 can be inserted and removed to make one end of the connecting rod 44 rotatably connected to the end of different cams 42. After installation, the pin 45 is used to fix and limit the movement, thereby changing the stroke of the suction rod 46.

[0049] Further, see Figure 5 As shown, in order to enable the ball to automatically reset, the present invention uses a reset component 5 including a mounting plate 51. Several support rods 52 are fixedly mounted on the mounting plate 51 in a circumferential direction. The mounting plate 51 is fixedly connected to the inner wall of the conveying pipe 3 through the support rods 52. A first telescopic rod 53 is fixedly mounted at the bottom of the mounting plate 51. A reset spring 54 is sleeved on the first telescopic rod 53. The sealing component 6 includes a sealing ball 61. The top of the sealing ball 61 is connected to the first telescopic rod 53 and the reset spring 54.

[0050] During operation, the sealing ball 61 is tightly fitted onto the clamping assembly 7 by the elastic force of the return spring 54, realizing the basic one-way valve principle. When a negative pressure is formed at the center of the delivery pipe 3 through the suction rod 46, the sealing ball 61 in the second one-way valve is lifted by the negative pressure, and then the liquid flows into the delivery pipe 3 through the center of the clamping assembly 7. When the delivery pipe 3 is pushed by the suction rod 46, the sealing ball 61 in the first one-way valve is lifted, realizing the liquid pumping out. At this time, the sealing ball 61 in the second one-way valve is sealed by the elastic force of the return spring 54.

[0051] Furthermore, see Figures 5-7 As shown, to increase the contact area between the liquid and the sealing ball 61 when it is lifted, and to improve the efficiency of liquid pumping, the present invention employs a first negative pressure assembly 8, including a first negative pressure plate 82. The first negative pressure plate 82 has several circumferentially arranged first flow ports 83. The first negative pressure plate 82 is connected to the bottom of the sealing assembly 6 on the first one-way valve. The first negative pressure assembly 8 also includes a first connecting pipe 81. The top of the first connecting pipe 81 is fixedly connected to the bottom of the sealing ball 61 on the first one-way valve, and the bottom of the first connecting pipe 81 is fixedly connected to the first negative pressure plate 82. The diameter of the first connecting pipe 81 is smaller than the diameter of the bottom of the flow port 74. Both the first connecting pipe 81 and the first negative pressure plate 82 have several interconnected first drainage grooves 84 arranged circumferentially. 4. The top is connected to the bottom of the second drainage groove 64; secondly, the second negative pressure component 9 includes a second negative pressure plate 92, on which several second flow ports 94 are circumferentially opened, the second negative pressure plate 92 is connected to the top of the sealing component 6 on the second one-way valve, the second negative pressure component 9 also includes a second connecting pipe 91, the bottom of the second connecting pipe 91 is fixedly connected to the top of the sealing ball 61 on the second one-way valve, the top of the second connecting pipe 91 is fixedly connected to the second negative pressure plate 92, several fifth drainage grooves 93 are circumferentially opened on both the second connecting pipe 91 and the second negative pressure plate 92, and several fourth drainage grooves 95 are opened on the sealing ball 61 on the second one-way valve and connected to the fifth drainage grooves 93, and the fourth drainage grooves 95 are connected to the third drainage groove 75 on the second one-way valve;

[0052] During operation, when negative pressure is generated in the delivery pipe 3, for the first check valve, since the sealing ball 61 is connected to the first negative pressure plate 82 through the first connecting pipe 81, the sealing ball 61 effectively expands the pressure-bearing area of ​​its bottom under negative pressure conditions within the delivery pipe 3 through the first negative pressure plate 82. The negative pressure acts on both sides of the first negative pressure plate 82 through the first flow port 83 and the first drainage groove 84 on the first negative pressure plate 82. Moreover, the area of ​​the first negative pressure plate 82 itself is larger than that of the traditional method where only the bottom of the sealing ball 61 is the pressure-bearing area. Therefore, it can drive the sealing ball 61 to fit more firmly with the clamping assembly 7. Combined with the return spring 54, this further improves the sealing effect of the first check valve, creating a more sealed condition for the negative pressure within the delivery pipe 3. The components enable the second check valve to improve its pumping efficiency during the pumping process. For the second check valve, since the second negative pressure plate 92 is located above the sealing ball 61 and is connected to the sealing ball 61 in the second check valve through the second connecting pipe 91, the pressure-bearing area is larger than that of the sealing ball 61 in the traditional second check valve, where only the upper part of the ball structure is a pressure-bearing area. The negative pressure fluid can flow between the sealing ball 61 and the second negative pressure plate 92 through the fifth drainage groove 93 and the second flow port 94, making both the upper and lower surfaces of the second negative pressure plate 92 pressure-bearing areas. Combined with the pressure-bearing area of ​​the sealing ball 61 itself, the pressure-bearing area is greatly increased, allowing the liquid to quickly flow into the delivery pipe 3 through the center of the clamping assembly 7 during the pumping process.

[0053] In the pumping stage, the principle is reversed. The second negative pressure plate 92 in the second check valve is subjected to positive pressure, which makes the sealing ball 61 fit more tightly with the clamping assembly 7 to improve the sealing effect. Meanwhile, the sealing ball 61 in the first check valve is quickly lifted by the first negative pressure plate 82 and flows through the first flow port 83 and the first drainage groove 84 to the center of the clamping assembly 7, thus realizing pumping.

[0054] For details, see Figures 7-10 As shown, the pressure-bearing area of ​​the sealing ball 61 is increased by the second negative pressure plate 92 and the first negative pressure plate 82. However, when the sealing ball 61 achieves sealing through pressure and elasticity, the sealing effect between the sealing ball 61 and the corresponding conveying pipe 3 is limited because the sealing is traditionally achieved by hard contact between the sealing ball 61 and the inner cavity of the conveying pipe 3. Even if a sealing ring is used, there is no clamping action. Therefore, the present invention adopts a clamping assembly 7 including a support plate 71 fixed on the inner wall of the conveying pipe 3. The support plate 71 has a through-hole 74 in the center. A sealing part 72 is provided on the support plate 71 at the through-hole 74. A clamping ring 73 adapted to the sealing part 72 is fixed on the sealing ball 61. The sealing ball 61 is connected to the sealing part 72 through the clamping ring 73.

[0055] Secondly, the bottom of the sealing ball 61 is provided with a plurality of second drainage grooves 64 in a circumferential manner, and the clamping ring 73 is provided with a plurality of third drainage grooves 75 in a circumferential manner corresponding to the second drainage grooves 64; the second drainage grooves 64 are located inside the opening 74, and the top of the second drainage grooves 64 is in contact with the bottom of the opening 74 and the sealing ball 61; the sealing part 72 includes a mounting ring 721, a wedge ring 722 is fixed on the mounting ring 721, a sealing ring 723 is fixed on the top of the wedge ring 722, and an annular receiving groove 724 is provided on the mounting ring 721 around the wedge ring 722;

[0056] It is worth mentioning that the thickness of the sealing ring 723 is the same as the thickness of the top of the wedge ring 722, the inner wall structure of the clamping ring 73 is adapted to the wedge structure formed by the wedge ring 722 and the sealing ring 723, and the bottom of the clamping ring 73 is adapted to the annular receiving groove 724; the inside of the wedge structure formed by the wedge ring 722 and the sealing ring 723 is adapted to the bottom of the sealing ball 61.

[0057] During operation, when the delivery pipe 3 is under negative pressure, for the first check valve, the negative pressure fluid is guided through the third guide groove 75 to the center of the port 74, then flows through the bottom of the sealing ball 61, then through the second guide groove 64 corresponding to the third guide groove 75 at the bottom of the sealing ball 61, and then through the second guide groove 64 and the first guide groove 84 into the delivery pipe 3. This gradually increases the negative pressure in the delivery pipe 3. This series of connected guide grooves plays a role in rapid flow guidance, improving the efficiency of the negative pressure effect in the delivery pipe 3, so that the negative pressure fluid acts quickly on the second negative pressure plate 92, so that the sealing ball 61 is subjected to stronger downward pressure, and further improving the sealing effect of the first check valve. During the process of the sealing ball 61 being subjected to stronger downward pressure, the clamping ring 73 passes through its internal wedge-shaped inclined surface that is adapted to the wedge-shaped ring 722 and the sealing ring 723. The clamping ring 73 presses against the bottom of the mounting ring 721, thereby making the wedge ring 722 and the sealing ring 723 fit more tightly against the bottom of the sealing ball 61, until the bottom of the clamping ring 73 presses against the bottom of the annular receiving groove 724 on the mounting ring 721. In this way, the bottom of the mounting ring 721 achieves efficient sealing through the fit between the clamping ring 73 and the annular receiving groove 724. Around the sealing ball 61, the clamping ring 73 presses against the sealing ball 61, and the wedge ring 722 and the sealing ring 723 together, thus achieving efficient sealing by fitting tightly against the sealing ball 61. The sealing ring 723 compensates for the insufficient compression of the top of the wedge ring 722, so that the wedge ring 722 and the sealing ring 723 together form an annular sealing ring with a certain height. Compared with the traditional method, the sealing ring changes from passive sealing to active compression sealing, thereby improving the sealing effect.

[0058] For the second check valve, the negative pressure fluid causes the sealing ball 61 to lift up through the second negative pressure plate 92, and the liquid flows through the center of the port 74, through the second diversion groove 64, then through the fourth diversion groove 95, and then through the fifth diversion groove 93 to achieve rapid liquid diversion. Combined with the opening of the second flow port 94, the rapid diversion effect can be improved during the process of the second negative pressure plate 92 driving the sealing ball 61 to lift up quickly.

[0059] Similarly, when the delivery pipe 3 is under positive pressure, the second check valve described above squeezes the wedge ring 722 and the sealing ring 723 through the clamping ring 73, and finally fits against the bottom of the annular receiving groove 724 to achieve efficient sealing of the second check valve; while the pumped liquid flows through the first diversion groove 84, the second diversion groove 64 and the third diversion groove 75, and is quickly pumped out by combining with several first flow ports 83.

[0060] Further, see Figure 10 and Figure 11 As shown, due to the inherent structural problems or other issues within traditional plunger pumps, which can lead to pumping or suction malfunctions and a risk of cylinder explosion, this invention addresses this risk. Specifically, the sealing ball 61 has several L-shaped guide grooves 62 arranged around the axis of the delivery pipe 3. An explosion-proof component 63 is installed at the top of each guide groove 62. The explosion-proof component 63 includes a second telescopic rod 631, one end of which is fixedly connected to the inner wall of the top of the guide groove 62, and the other end of which is fixedly connected to a sealing cap 632. The sealing cap 632 is located at the top of the guide groove 62. A strong spring 633 is fitted onto the second telescopic rod 631, and the sealing cap 632 is connected to the inner wall of the guide groove 62 via the strong spring 633. The sealing cap 632 is located above the support plate 71.

[0061] During operation, when there is a problem with the positive pressure in the delivery pipe 3, that is, when there is a problem with pumping, the liquid may not be able to be pumped out temporarily or the pumping efficiency may not be able to keep up. In this case, the liquid will temporarily flow out through the guide channel 62 in the first one-way valve. Since the pressure in the delivery pipe 3 is very high at this time, it can push up the sealing cap 632. Because the guide channel 62 is relatively small and the strong spring 633 is specially designed with a spring force threshold that matches the pressure threshold that the delivery pipe 3 can withstand, the pumping efficiency can be temporarily increased through the guide channel 62. After that, the machine can be quickly stopped for maintenance. Similarly, when there is a problem with the negative pressure in the delivery pipe 3, the liquid can be temporarily pumped in through the guide channel 62 in the second one-way valve.

[0062] In summary, by introducing a crankshaft assembly 4 that can adjust the suction stroke length, the pumping power can be flexibly adjusted according to demand while keeping the speed of the drive motor 2 constant. Secondly, by setting a negative pressure plate and connecting pipe, and optimizing the layout of the diversion groove, the force-bearing area of ​​the sealing ball 61 under negative pressure conditions is increased. Then, by using the clamping assembly 7 composed of the wedge ring 722 and the sealing ring 723, active compression sealing between the sealing ball 61 and the valve seat is achieved, greatly enhancing the sealing effect. Finally, a diversion groove with an explosion-proof component 63 is designed, which can automatically release pressure when the system pressure is abnormal, preventing equipment damage caused by overpressure. Thus, it effectively solves the problem in the existing plunger pumps that use a spherical valve body as a check valve, where the spherical sealing form causes a delayed opening response and limited flow capacity, affecting the improvement of pumping efficiency and dynamic performance.

[0063] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0064] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A variable stroke dual-chamber plunger pump, comprising a housing (1) and two sets of drive motors (2), wherein two delivery pipes (3) are provided inside the housing (1), characterized in that: A crankshaft assembly (4) is provided on the output shaft of the drive motor (2). The housing (1) is connected to the corresponding delivery pipe (3) through the crankshaft assembly (4). A first check valve and a second check valve are symmetrically arranged in the delivery pipe (3) along the axis of the crankshaft assembly (4). Each check valve includes a reset assembly (5), a sealing assembly (6), and a clamping assembly (7) arranged sequentially from top to bottom. The sealing assembly (6) achieves sealing by the elastic extension and contraction of the reset assembly (5) and the fit of the clamping assembly (7). The sealing assembly (6) on the first check valve is provided with a first negative pressure assembly (8), and the sealing assembly (6) on the second check valve is provided with a second negative pressure assembly (9). The first negative pressure assembly (8) and the second negative pressure assembly (9) are arranged opposite to each other. The first negative pressure assembly (8) includes a first negative pressure plate (82), and the first negative pressure plate (82) has several first flow ports (83) circumferentially opened on it. The first negative pressure plate (82) is connected to the bottom of the sealing assembly (6) on the first one-way valve. The second negative pressure assembly (9) includes a second negative pressure plate (92), which has several rings of second flow ports (94) circumferentially opened on the second negative pressure plate (92), and the second negative pressure plate (92) is connected to the top of the sealing assembly (6) on the second one-way valve; The first negative pressure assembly (8) further includes a first connecting pipe (81), the top of the first connecting pipe (81) is fixedly connected to the bottom of the sealing ball (61) on the first one-way valve, the bottom of the first connecting pipe (81) is fixedly connected to the first negative pressure plate (82), the diameter of the first connecting pipe (81) is smaller than the diameter of the bottom of the port (74), and a plurality of interconnected first drainage grooves (84) are provided on the first connecting pipe (81) and the first negative pressure plate (82) in a circumferential direction, the top of the first drainage groove (84) is connected to the bottom of the second drainage groove (64); The second negative pressure assembly (9) also includes a second connecting pipe (91). The bottom of the second connecting pipe (91) is fixedly connected to the top of the sealing ball (61) on the second one-way valve. The top of the second connecting pipe (91) is fixedly connected to the second negative pressure plate (92). The second connecting pipe (91) and the second negative pressure plate (92) are provided with several interconnected fifth drainage grooves (93) in a circumferential direction. The sealing ball (61) on the second one-way valve is provided with several fourth drainage grooves (95) that are connected to the fifth drainage grooves (93). The fourth drainage grooves (95) are connected to the third drainage grooves (75) on the second one-way valve.

2. The variable stroke dual-chamber piston pump according to claim 1, characterized in that: The crankshaft assembly (4) includes a rotating disk (41) fixed on the output shaft of the drive motor (2). A plurality of cams (42) are fixed circumferentially on the rotating disk (41). The cams (42) are concentric with the rotating disk (41), and the distance from the outer edge of the cams (42) to the center of the rotating disk (41) increases sequentially. A connecting shaft (43) is detachably provided on one of the cams (42). A connecting rod (44) is provided on the connecting shaft (43). One end of the connecting rod (44) is rotatably connected to the connecting shaft (43), and the other end of the connecting rod (44) is rotatably connected to a suction rod (46). A pin (45) is provided on the connecting shaft (43). The connecting rod (44) is connected to the connecting shaft (43) through the pin (45). The suction rod (46) is slidably connected in the suction tube (47). The end of the suction tube (47) away from the rotating disk (41) is connected to the delivery tube (3).

3. The variable stroke dual-chamber piston pump according to claim 1, characterized in that: The reset assembly (5) includes a mounting plate (51), on which a plurality of support rods (52) are fixed in a circumferential direction. The mounting plate (51) is fixedly connected to the inner wall of the delivery pipe (3) through the support rods (52). A first telescopic rod (53) is fixedly provided at the bottom of the mounting plate (51), and a reset spring (54) is sleeved on the first telescopic rod (53).

4. The variable stroke dual-chamber piston pump according to claim 3, characterized in that: The sealing assembly (6) includes a sealing ball (61), the top of which is connected to the first telescopic rod (53) and the return spring (54). Several L-shaped guide grooves (62) are formed inside the sealing ball (61) around the axis of the conveying pipe (3). An explosion-proof assembly (63) is provided at the top of the guide groove (62). Several second guide grooves (64) are formed circumferentially on the bottom of the sealing ball (61).

5. The variable stroke dual-chamber piston pump according to claim 4, characterized in that: The clamping assembly (7) includes a support plate (71) fixed to the inner wall of the conveying pipe (3). The support plate (71) has a through-hole (74) at its center. A sealing part (72) is provided on the support plate (71) at the through-hole (74). A clamping ring (73) adapted to the sealing part (72) is fixed on the sealing ball (61). The sealing ball (61) is connected to the sealing part (72) through the clamping ring (73). The clamping ring (73) is provided with a plurality of third drainage grooves (75) that correspond one-to-one with the second drainage groove (64) in a circumferential direction. The second drainage groove (64) is located inside the opening (74), and the top of the second drainage groove (64) is in contact with the bottom of the opening (74) and the sealing ball (61).

6. The variable stroke dual-chamber piston pump according to claim 5, characterized in that: The sealing part (72) includes a mounting ring (721), a wedge ring (722) is fixed on the mounting ring (721), a sealing ring (723) is fixed on the top of the wedge ring (722), and an annular receiving groove (724) is opened on the mounting ring (721) around the wedge ring (722).

7. The variable stroke dual-chamber piston pump according to claim 6, characterized in that: The thickness of the sealing ring (723) is the same as the thickness of the top of the wedge ring (722), the inner wall structure of the clamping ring (73) is adapted to the wedge structure formed by the wedge ring (722) and the sealing ring (723), and the bottom of the clamping ring (73) is adapted to the annular receiving groove (724); The wedge-shaped structure formed by the wedge ring (722) and the sealing ring (723) is adapted to the bottom of the sealing ball (61).

8. The variable stroke dual-chamber piston pump according to claim 5, characterized in that: The explosion-proof component (63) includes a second telescopic rod (631), one end of which is fixedly connected to the inner wall of the top of the guide channel (62), and the other end of which is fixedly connected to a sealing cap (632). The sealing cap (632) is located at the top of the guide channel (62). A strong spring (633) is sleeved on the second telescopic rod (631), and the sealing cap (632) is connected to the inner wall of the guide channel (62) through the strong spring (633). The sealing cap (632) is located above the support plate (71).

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