High-pressure cam pump with stable conveying flow

Abstract

The invention relates to the technical field of ion chromatography detection, in particular to a high-pressure cam pump stable in conveying flow, which at least comprises a first pumping assembly, and the first pumping assembly comprises a pump head, a pump body, a plunger rod, a liquid inlet, a liquid outlet and a sealing assembly. A liquid inlet and outlet structure is improved, and a liquid outlet is formed in the tail end of a pump cavity, namely, the liquid outlet is formed in the contact position of the pump cavity and a sealing assembly, so that liquid is pumped out in a first-in first-out mode, namely, the sucked liquid is pumped out first, dissolved gas or air bubbles and the like in the liquid conveying process are removed in time, and the liquid conveying efficiency is improved. Meanwhile, the liquid outlet is formed in the position of the sealing assembly, bubbles accumulated for a long time at the position of the sealing assembly can be taken out in time when the liquid is pumped out, and after operation is carried out for a period of time, the conveying flow is stable and the precision is high; and compared with the situation of poor conveying flow precision, the improvement effect is remarkable.

Description

Technical Field

[0001] The invention relates to the technical field of ion chromatography detection, and in particular to a high-pressure cam pump with stable delivery flow. Background Art

[0002] Ion chromatography is a high performance liquid chromatography technique used to separate and quantitatively analyze ionic compounds in solutions. Due to its high selectivity and high sensitivity, it is widely used in water quality monitoring, food and beverage industry, pharmaceutical industry, environmental science, chemical industry and other fields. Liquid phase delivery accuracy and stability play an extremely important role in ion chromatography detection, which is directly related to the accuracy, reproducibility and reliability of the analysis results; for example, inaccurate liquid phase flow rate will lead to changes in retention time, affecting the separation effect; for example, a slight change in liquid phase flow rate will lead to baseline drift or increased noise, changes in peak area or peak height, affecting the detection sensitivity and the consistency and reproducibility of experimental results; for example, for quantitative analysis, flow accuracy directly affects the intensity of the detection signal, which will cause deviations in sample concentration and affect the accuracy of quantitative analysis. Studies have shown that the instability and inaccuracy of liquid phase flow rate are mostly caused by the presence of gas in the liquid phase.

[0003] In response to the above problems, most ion chromatography detection equipment currently introduces a degassing device to degas the sample during the sample transportation process to remove the air or dissolved gas contained therein, thereby reducing the problems of poor liquid flow accuracy and unstable liquid flow transportation caused by large dead volume. However, after long-term practical work, it was found that even if the liquid phase is transported through a degassing device, there will still be problems of unstable liquid flow and poor accuracy during long-term transportation, so it is still urgent for R&D personnel to solve it. Summary of the invention

[0004] The object of the present invention is to provide a high-pressure cam pump with a stable delivery flow rate to solve the prior art problems existing in the above-mentioned background technology.

[0005] In order to solve the above-mentioned technical problems, the technical solution provided by the present invention is as follows: a high-pressure cam pump with stable delivery flow is provided, which comprises at least a first pumping assembly, wherein the first pumping assembly comprises a pump head, a pump body, a plunger rod, a liquid inlet, a liquid outlet and a sealing assembly, wherein the pump body is fixedly connected to the pump head, a pump chamber is formed in the pump head, the plunger rod reciprocates in the pump chamber, the liquid inlet and the liquid outlet are both connected to the pump chamber, the liquid outlet and the liquid inlet are not located on the same radial direction of the pump chamber, and the sealing assembly is sleeved on the plunger rod and located at the end of the pump chamber.

[0006] Based on the above technical solution, the liquid inlet is arranged at the head end of the pump cavity, and the liquid outlet is arranged at the end end of the pump cavity.

[0007] On the basis of the above technical solution, it also includes a second pumping assembly which is arranged in parallel with the first pumping assembly and has the same structure, and the pump chamber of the second pumping assembly is arranged in series with the pump chamber of the first pumping assembly.

[0008] On the basis of the above technical solution, an adaptive adjustment mechanism is provided at the end of the plunger rod, and the adaptive adjustment mechanism includes a spacer, a floating plate and a limit piece. The spacer is configured as an internal hollow structure, the floating plate is arranged in the spacer and has a clearance fit, a spherical contact is configured between the end of the plunger rod and the floating plate, and the limit piece is arranged on the inner wall of the spacer and is located on the outer side of the floating plate.

[0009] On the basis of the above technical solution, a ball head structure is arranged at one end of the plunger rod, and a spherical groove matching the ball head structure is arranged on the end surface of the floating plate.

[0010] On the basis of the above technical solution, a fixing seat is further arranged inside the spacer sleeve, and the fixing seat is arranged on the inner side of the floating plate along the axial direction of the spacer sleeve.

[0011] Based on the above technical solution, the plunger rod is driven to reciprocate in the pump chamber by a driving mechanism. The driving mechanism includes a driving motor, a cam and a slider. The driving motor is fixed on the outer wall of the pump body. The cam is driven to rotate by the driving motor through a transmission mechanism. The slider is arranged on one side of the cam and driven to slide by the cam. The spacer sleeve is fixed on the side of the slider away from the cam.

[0012] Based on the above technical solution, the transmission mechanism includes a driving wheel, a synchronous belt, a driven wheel and a rotating shaft. The driving motor drives the driving wheel to rotate, and the driving wheel drives the driven wheel to rotate through the synchronous belt. The driven wheel is coaxially arranged with the rotating shaft and rotates synchronously, and the cam is fixedly sleeved on the rotating shaft.

[0013] On the basis of the above technical solution, it also includes a reset mechanism for returning the plunger rod, the reset mechanism includes an elastic member and a fixed pressure plate, the fixed pressure plate is fixedly connected to the outer wall of the pump head through a connecting column, the elastic member is sleeved on the plunger rod and one end abuts against the fixed pressure plate, and the other end abuts against the outer wall of the pump head.

[0014] On the basis of the above technical solution, a flushing cavity is further provided in the pump head, the plunger rod passes through the flushing cavity, and a sealing assembly is also provided between the plunger rod and the flushing cavity.

[0015] The beneficial effects of the technical solution provided by the present invention are: The present application provides a high-pressure cam pump with a stable delivery flow rate. By improving the liquid inlet and outlet structure, the liquid outlet is set at the end of the pump chamber, that is, the liquid outlet is set at the contact position between the pump chamber and the sealing component. With this arrangement, the liquid is pumped out first in a first-in-first-out manner, that is, the liquid sucked in first is pumped out first, and the dissolved gas or air bubbles in the liquid delivery process are removed in time, and no accumulation occurs. At the same time, the liquid outlet is set at a position close to the sealing component, and the bubbles accumulated in the sealing component for a long time will be taken out in time when the liquid is pumped out. After running for a period of time, the delivery flow rate is stable and accurate. Compared with the prior art in which bubbles accumulate more and more after stable operation and the delivery flow rate accuracy is poor, the improvement effect is significant. A key inventive point of the present invention also lies in the discovery of technical problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the internal structure of the present invention; Figure 3 yes Figure 2 A local enlarged schematic diagram of the middle A; Figure 4 yes Figure 2 A partial enlarged schematic diagram of point B in the middle; Figure 5 It is a schematic diagram of the structure of the plunger rod in the present invention; Figure 6 It is a structural schematic diagram of the floating plate in the present invention; Figure 7 It is a schematic diagram of the structure of the present invention after removing the pump body; DETAILED DESCRIPTION The present invention will be further described below in conjunction with the accompanying drawings and embodiments: In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0017] In the description of the present invention, it is necessary to understand that the terms "left", "right", "front", "back", "top", "bottom", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0018] like Figures 1 to 7 As shown, a high-pressure cam pump with a stable delivery flow rate includes at least a first pumping assembly 10, wherein the first pumping assembly 10 includes a pump head 1, a pump body 2, a plunger rod 3, a liquid inlet 4, a liquid outlet 5 and a sealing component 6. The pump body 2 is fixedly connected to the pump head 1, a pump chamber 11 is formed in the pump head 1, the plunger rod 3 reciprocates in the pump chamber 11, the liquid inlet 4 and the liquid outlet 5 are both connected to the pump chamber 11, the liquid outlet 5 and the liquid inlet 4 are not located on the same radial direction of the pump chamber 11, and the sealing component 6 is sleeved on the plunger rod 3 and located at the end of the pump chamber 11.

[0019] On the basis of the above technical solution, the liquid inlet 4 is arranged at the head end of the pump chamber 11 , and the liquid outlet 5 is arranged at the end end of the pump chamber 11 .

[0020] A key inventive point of the present invention lies in the discovery of technical problems, that is, based on the discovery in the prior art, even if a degassing device is introduced during the ion chromatography detection process, there will still be a problem of unstable liquid phase delivery accuracy in long-term operation, which still has adverse effects on subsequent test results; the inventor found that in the prior art, the liquid outlet and the liquid inlet in the pump head are relatively arranged, that is, located in the same radial direction, and during the reciprocating motion of the plunger rod, the liquid phase is sucked from the liquid inlet and pumped out from the liquid outlet, and the liquid adopts the first-in-last-out method, that is, the first sucked liquid is sucked into the rear end of the pump cavity, and the last sucked liquid is pumped out first when pumping out, and bubbles are easily accumulated in the liquid phase; elastic sealing components such as sealing rings and springs are arranged at the connection position between the plunger rod and the pump head, and bubbles are easily gathered at this position and cannot be discharged in time during the liquid discharge process, and bubbles will accumulate during multiple liquid suction and liquid discharge processes, resulting in a large dead volume, more and more air is retained, and the flow rate is unstable; on the other hand, since the sealing component is an elastic part, the compression amount will change when air is retained, which will further increase the inaccuracy of the delivery flow rate. Therefore, based on the discovery of this technical problem, the inventor has made improvements to the technical solution of this application.

[0021] Another key improvement of the present invention is that the present application provides a high-pressure cam pump with a stable delivery flow rate. By improving the liquid inlet and outlet structure, the liquid outlet 5 is set at the end of the pump chamber 11, that is, the liquid outlet 5 is set at the contact position between the pump chamber 11 and the sealing component 6. With this arrangement, the liquid is pumped out first in a first-in-first-out manner, that is, the liquid sucked in first is pumped out first, and the dissolved gas or air bubbles in the liquid delivery process are removed in time without accumulation. At the same time, the liquid outlet 5 is set at the position of the sealing component 6, and the bubbles accumulated for a long time at the sealing component 6 will also be taken out in time when the liquid is pumped out. After running for a period of time, the delivery flow rate is more stable and the accuracy is high. Compared with the situation in the prior art that bubbles will accumulate more and more after the operation is stable and the delivery flow rate accuracy is poor, the improvement effect is significant.

[0022] More preferably, a one-way valve is provided between the liquid inlet 4 and the liquid outlet 5 and the pump cavity.

[0023] On the basis of the above technical solution, it also includes a second pumping assembly 20 which is arranged in parallel with the first pumping assembly 10 and has the same structure, and the pump chamber of the second pumping assembly 20 is arranged in series with the pump chamber of the first pumping assembly 10.

[0024] Specifically, the liquid outlet of the first pumping assembly 10 is connected to the liquid inlet of the second pumping assembly 20 through a pipeline to realize a series structure. In a preferred embodiment, the pump heads in the second pumping assembly 20 and the first pumping assembly 10 can use the same pump head. In a preferred embodiment, the pump head of the second pumping assembly 20 and the pump head of the first pumping assembly 10 are arranged in parallel, that is, a split design is adopted, and the corresponding pump chambers and plunger rods are correspondingly arranged in their respective pump heads, which can reduce the processing difficulty of the two plunger rods due to high parallelism and reduce the problem of component wear.

[0025] On the basis of the above technical solution, an adaptive adjustment mechanism 30 is provided at the end of the plunger rod 3, and the adaptive adjustment mechanism 30 includes a spacer sleeve 301, a floating plate 302 and a limit member 303. The spacer sleeve 301 is configured as an internal hollow structure, and the floating plate 302 is arranged in the spacer sleeve 301 and has a clearance fit. A spherical contact is configured between the end of the plunger rod 3 and the floating plate 302, and the limit member 303 is arranged on the inner wall of the spacer sleeve 301 and is located on the outer side of the floating plate 302.

[0026] By providing an adaptive adjustment mechanism 30 at the end of the plunger rod 3, that is, adopting a matching structure in which the plunger rod 3 and the floating plate 302 form a spherical contact, the plunger rod 3 can be adaptively adjusted during the operation of the cam pump, thereby improving the problem of inconsistent coaxiality and parallelism between the plunger rod and the pump head and pump body caused by processing errors, assembly errors, etc., and reducing the difficulty of processing and assembly; at the same time, it can also effectively improve the wear problem of the plunger rod caused by the force of the constantly changing direction during the operation of the cam in the cam pump, especially in the cam drive mode, and the plunger rod can be adaptively adjusted to reduce eccentric wear, extend the service life, and reduce the impact on the accuracy of liquid delivery. Specifically, since there is a gap between the floating plate 302 and the inner wall of the spacer 301, the position can be fine-tuned, and the corresponding position of the plunger rod 3 can also be fine-tuned, and the coaxiality and parallelism can be adaptively adjusted. A limiting member 303 is provided in the spacer sleeve 301 to prevent the floating plate 302 from falling out; in a more preferred embodiment, the limiting member 303 is configured as a sealing ring. Specifically, a groove is provided on the inner wall of the spacer sleeve 301, and the sealing ring is installed in the groove; more preferably, the sealing ring is an O-ring.

[0027] On the basis of the above technical solution, a ball head structure 31 is provided at one end of the plunger rod 3 , and a spherical groove 32 matched with the ball head structure 31 is provided on the end surface of the floating plate 302 .

[0028] In a preferred embodiment, a ball head structure 31 is provided at the end of the plunger rod 3, a spherical groove 32 is provided on the end surface of the floating plate 302, and spherical contact is achieved in a form of adaptation between the ball head structure 31 and the spherical groove 32, thereby achieving adaptive adjustment of the plunger rod 3 during movement.

[0029] In other preferred embodiments, the end of the plunger rod 3 can also be set to an arc structure, and the corresponding end face structure of the floating plate 302 can be adaptively adjusted, that is, spherical contact between the plunger rod 3 and the floating plate 302 can be achieved. If there is inconsistency in coaxiality and parallelism during operation, adaptive adjustment is performed to reduce eccentric wear.

[0030] On the basis of the above technical solution, a fixing seat 304 is further provided inside the spacer sleeve 301 , and the fixing seat 304 is axially arranged on the inner side of the floating plate 302 along the spacer sleeve 301 .

[0031] In a preferred embodiment, a fixing seat 304 is provided between the inner side of the floating plate 302 and the bottom of the spacer 301, and the end surface of the fixing seat 304 has a high degree of finish. During the fine adjustment of the floating plate 302, the friction coefficient of the friction pair formed between the fixing seat 304 and the floating plate 302 is lower, thereby reducing the friction loss of the floating plate 302. It should be noted that the floating plate 302 abuts against the fixing seat 304, but does not affect the movement of the floating plate during the fine adjustment process.

[0032] On the basis of the above technical solution, the plunger rod 3 is driven to reciprocate in the pump chamber by a driving mechanism, and the driving mechanism includes a driving motor 71, a cam 72 and a slider 73. The driving motor 71 is fixedly arranged on the outer wall of the pump body 2, and the cam 72 is driven to rotate by the driving motor 71 through a transmission mechanism. The slider 73 is arranged on one side of the cam 72 and is driven to slide by the cam 72. The spacer sleeve 301 is fixedly arranged on the side of the slider 73 away from the cam 72.

[0033] Based on the above technical solution, the transmission mechanism includes a driving wheel 74, a synchronous belt 75, a driven wheel 76 and a rotating shaft 77. The driving motor 71 drives the driving wheel 74 to rotate, and the driving wheel 74 drives the driven wheel 76 to rotate through the synchronous belt 75. The driven wheel 76 is coaxially arranged with the rotating shaft 77 and rotates synchronously. The cam 72 is fixedly sleeved on the rotating shaft 77.

[0034] In this embodiment, the driving mechanism is configured as a driving mechanism in which a driving motor 71 and a cam 72 cooperate. In other preferred embodiments, a driving motor and a ball screw may cooperate as long as the reciprocating motion of the driving plunger rod can be achieved.

[0035] Specifically, when the driving motor 71 is working, it drives the driving wheel 74 to rotate, and the driving wheel 74 drives the driven wheel 76 to rotate through the synchronous belt 75. The driven wheel 76 drives the rotating shaft 77 to rotate on the pump body 2, thereby driving the cam 72 to rotate. When the cam 72 rotates, the slider 73 and the plunger rod 3 connected thereto are driven to slide in the pump chamber 11, thereby realizing the process of liquid suction and liquid discharge of the pump chamber 11.

[0036] In a more preferred embodiment, the cams of the first pumping assembly 10 and the second pumping assembly 20 are both arranged on the same rotating shaft 77, that is, the same set of drive motors 71 are used to drive the transmission mechanism to realize the movement of the sliders of the first pumping assembly 10 and the second pumping assembly 20, and then drive the movement of their respective plunger rods, thereby realizing the liquid suction and discharge process of the corresponding pump chamber, and then realizing the smooth delivery of the liquid sample.

[0037] In another preferred embodiment, the driving mechanism can also realize the driving of the plunger rod by cooperating with the driving motor and the ball screw pair structure; specifically, the driving mechanism includes a driving motor, a screw, a nut and a screw mounting shaft, the screw is fixedly connected to the output shaft of the driving motor through a coupling, the nut is sleeved on the screw and slidably connected, the screw mounting shaft is fixedly sleeved on the nut, and the free end of the screw mounting shaft is connected to the plunger rod.

[0038] More preferably, a groove is provided at the free end of the screw mounting shaft, or a spacer is provided in the groove, so as to facilitate the installation of the floating plate, thereby forming a spherical contact between the plunger rod and the floating plate.

[0039] On the basis of the above technical solution, it also includes a reset mechanism for returning the plunger rod 3, the reset mechanism includes an elastic member 81 and a fixed pressure plate 82, the fixed pressure plate 82 is fixedly connected to the outer wall of the pump head 1 through a connecting column 83, the elastic member 81 is sleeved on the plunger rod 3 and one end abuts against the fixed pressure plate 82, and the other end abuts against the outer wall of the pump head 1.

[0040] The reset mechanism is provided to realize the return of the plunger rod 3, that is, the driving mechanism drives the plunger rod 3 to move forward, and then the plunger rod 3 and the slider 73 are reset under the action of the reset mechanism. Specifically, the fixed pressure plate 82 is fixedly connected to the outer wall of the pump head 1 through the connecting column 83, and one end of the elastic member 81 abuts on the fixed pressure plate 82, and the other end abuts on the outer wall of the pump head 1. In a preferred embodiment, the elastic member 81 is configured as a spring.

[0041] On the basis of the above technical solution, a flushing chamber 12 is further provided in the pump head 1 , the plunger rod 3 is arranged to penetrate the flushing chamber 12 , and a sealing assembly 6 is also provided between the plunger rod 3 and the flushing chamber 12 .

[0042] Specifically, the plunger rod 3 and other components can be cleaned irregularly through the water inlet and outlet provided on the flushing chamber 12. At the same time, it can be understood that the sealing assembly is sleeved on the plunger rod, but does not affect the reciprocating motion of the plunger rod, and the sealing assembly realizes the sealing function.

[0043] By arranging two sealing assemblies on the plunger rod 3, that is, a high-pressure sealing ring is arranged between the plunger rod 3 and the pump chamber 11, and a low-pressure sealing ring is arranged between the plunger rod 3 and the flushing chamber 12, and by arranging the high-pressure sealing ring and the low-pressure sealing ring, and arranging the flushing chamber between the two sealing rings, the friction area of ​​the plunger rod and the high-pressure sealing ring can be effectively cleaned, providing favorable conditions for extending the service life of the sealing ring on the pump head; at the same time, arranging two sealing ring structures can also play a better auxiliary straightening role for the plunger rod, avoiding the problem of wear and tear during operation, resulting in eccentric wear of the plunger rod and sealing failure.

[0044] More preferably, the sealing assembly adopts a pan-seal. The pan-seal is a high-performance seal with a special spring inside a U-shaped Teflon. The appropriate spring force plus the system fluid pressure pushes the sealing surface out and gently presses the sealed metal surface to produce a very excellent sealing effect. The actuation effect of the spring can overcome the slight eccentricity of the metal mating surface and the wear of the sealing surface, and continue to maintain the expected sealing performance.

[0045] It should be noted that the head end and the tail end mentioned above are defined according to the direction of liquid phase transport, which is only for the convenience of understanding of the present technical solution and does not constitute a limitation to the present application.

[0046] The high-pressure cam pump in this application and several common plunger pumps on the market were used to test the accuracy and stability of liquid delivery during use, and the results are shown in Table 1. S is the pump flow setting error, S R For pump flow stability, the self-developed pump is the high-pressure cam pump in this application.

[0047] Table 1 Test results of the high-pressure cam pump of this application and other commercially available plunger pumps

[0048] It can be seen from Table 1 that the performance of the high-pressure cam pump in this application is at a high level, whether in terms of the error with the pump flow setting value or the stability of the pump flow. S ≤±1.0%, S R≤0.5%. It can be seen that the high-pressure cam pump in this application can maintain excellent performance in terms of accuracy and stability under different flow rate conditions. Compared with several other plunger pumps, it has more beneficial technical effects, which is also closely related to the structural improvement of this application.

[0049] The basic principles and main features of the present invention are shown and described above. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments. Therefore, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the appended claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention.

[0050] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A high-pressure cam pump with a stable delivery flow, characterized in that: The invention comprises at least a first pumping assembly (10), wherein the first pumping assembly (10) comprises a pump head (1), a pump body (2), a plunger rod (3), a liquid inlet (4), a liquid outlet (5) and a sealing assembly (6); the pump body (2) is fixedly connected to the pump head (1); a pump chamber (11) is formed in the pump head (1); the plunger rod (3) reciprocates in the pump chamber (11); the liquid inlet (4) and the liquid outlet (5) are both connected to the pump chamber (11); the liquid outlet (5) and the liquid inlet (4) are not located in the same radial direction of the pump chamber (11); and the sealing assembly (6) is sleeved on the plunger rod (3) and located at the end of the pump chamber (11).

2. A high-pressure cam pump with a stable delivery flow according to claim 1, characterized in that: The liquid inlet (4) is arranged at the head end of the pump chamber (11), and the liquid outlet (5) is arranged at the end end of the pump chamber (11).

3. A high-pressure cam pump with a stable delivery flow according to claim 1, characterized in that: It also includes a second pumping assembly (20) which is arranged in parallel with the first pumping assembly (10) and has the same structure, and the pump chamber of the second pumping assembly (20) is arranged in series with the pump chamber of the first pumping assembly (10).

4. A high-pressure cam pump with a stable delivery flow according to claim 1, characterized in that: An adaptive adjustment mechanism (30) is provided at the end of the plunger rod (3), the adaptive adjustment mechanism (30) comprising a spacer sleeve (301), a floating plate (302) and a stopper (303), the spacer sleeve (301) being provided with an internal hollow structure, the floating plate (302) being provided in the spacer sleeve (301) and being clearance-fitted, a spherical contact being provided between the end of the plunger rod (3) and the floating plate (302), and the stopper (303) being provided on the inner side wall of the spacer sleeve (301) and being located on the outer side of the floating plate (302).

5. A high-pressure cam pump with a stable delivery flow according to claim 1, characterized in that: One end of the plunger rod (3) is provided with a ball head structure (31), and the end surface of the floating plate (302) is provided with a spherical groove (32) that matches the ball head structure (31).

6. A high-pressure cam pump with a stable delivery flow rate according to claim 1, characterized in that: A fixing seat (304) is also provided inside the spacer sleeve (301), and the fixing seat (304) is axially arranged on the inner side of the floating plate (302) along the spacer sleeve (301).

7. A high-pressure cam pump with a stable delivery flow rate according to claim 1, characterized in that: The plunger rod (3) is driven to reciprocate in the pump chamber by a driving mechanism, wherein the driving mechanism comprises a driving motor (71), a cam (72) and a slider (73), wherein the driving motor (71) is fixedly arranged on the outer wall of the pump body (2), the cam (72) is driven to rotate by the driving motor (71) via a transmission mechanism, the slider (73) is arranged on one side of the cam (72) and is driven to slide by the cam (72), and the spacer (301) is fixedly arranged on a side of the slider (73) away from the cam (72).

8. The high-pressure cam pump with stable delivery flow according to claim 1, characterized in that: The transmission mechanism comprises a driving wheel (74), a synchronous belt (75), a driven wheel (76) and a rotating shaft (77); the driving motor (71) drives the driving wheel (74) to rotate; the driving wheel (74) drives the driven wheel (76) to rotate via the synchronous belt (75); the driven wheel (76) and the rotating shaft (77) are coaxially arranged and rotate synchronously; and the cam (72) is fixedly sleeved on the rotating shaft (77).

9. A high-pressure cam pump with a stable delivery flow rate according to claim 1, characterized in that: The pump also comprises a reset mechanism for returning the plunger rod (3), the reset mechanism comprising an elastic member (81) and a fixed pressure plate (82), the fixed pressure plate (82) being fixedly connected to the outer wall of the pump head (1) via a connecting column (83), the elastic member (81) being sleeved on the plunger rod (3) with one end abutting against the fixed pressure plate (82) and the other end abutting against the outer wall of the pump head (1).

10. The high-pressure cam pump with stable delivery flow according to claim 1, characterized in that: A flushing cavity (12) is also provided in the pump head (1), the plunger rod (3) is arranged to penetrate the flushing cavity (12), and a sealing component (6) is also provided between the plunger rod (3) and the flushing cavity (12).

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