CN218971364U - High-pressure constant flow pump - Google Patents

Abstract

The utility model belongs to the technical field of high-pressure pumps, and discloses a high-pressure constant-flow pump, which comprises a pump body and a plunger rod, wherein a first flow cavity and a second flow cavity are arranged on the pump body, the first flow cavity is used for conveying liquid to be conveyed, cleaning liquid is arranged in the second flow cavity, one end of the plunger rod penetrates through the second flow cavity and is arranged in the first flow cavity, the plunger rod is movably connected with the pump body, the moving direction of the plunger rod is the direction towards the first flow cavity and the direction away from the first flow cavity, and when the plunger rod moves towards the first flow cavity and the direction away from the first flow cavity, the plunger rod can move in the second flow cavity, so that the effect of cleaning crystals on the outer surface of the plunger rod is realized.

Description

High-pressure constant flow pump

Technical Field

The utility model relates to the technical field of high-pressure pumps, in particular to a high-pressure constant-flow pump applied to a glycosylated hemoglobin analyzer.

Background

The high-pressure constant flow pump has the characteristics of accuracy, durability, stable conveying flow and the like, and is widely applied to laboratories of various universities and colleges, and various fields of medicine, chemical industry, food, environmental protection, experiment, scientific education, medical treatment and health and the like.

In the prior art, a high-pressure constant flow pump applied to a glycosylated hemoglobin analyzer generally comprises a pump body, a plunger rod, a transmission push rod, a sealing ring, a motor and other components, wherein an infusion channel is arranged on the pump body, one end of the plunger rod penetrates through the sealing ring and is arranged in the infusion channel, the other end of the plunger rod is connected with the transmission push rod, the transmission push rod is connected with the output end of the motor, the plunger rod can do reciprocating linear motion along the direction deviating from and facing the infusion channel under the combined action of the motor and the transmission push rod, when the plunger rod deviates from the infusion channel, the volume of the infusion channel is increased, liquid to be conveyed enters the infusion channel, when the plunger rod moves towards the infusion channel, the volume of the infusion channel is reduced, the liquid to be conveyed in the infusion channel is discharged out of the infusion channel, and therefore the effect of stable infusion of the high-pressure constant flow pump is achieved.

However, in the above technical scheme, the plunger rod disposed in the infusion channel is in contact with the liquid to be delivered for a long time, when the liquid to be delivered has a self-crystallization tendency, crystals are easily formed on the outer surface of the plunger rod in contact with the liquid to be delivered, and the crystals move along with the reciprocating movement of the plunger rod, so that the problem of abrasion of the sealing ring is caused.

Therefore, it is needed to provide a high-pressure constant-flow pump to solve the above technical problems.

Disclosure of Invention

The utility model aims to provide a high-pressure constant-flow pump which has the effect of cleaning crystals on the outer surface of a plunger rod.

To achieve the purpose, the utility model adopts the following technical scheme:

a high pressure constant flow pump comprising:

the pump body is provided with a first circulation cavity and a second circulation cavity, the first circulation cavity is used for conveying liquid to be conveyed, and cleaning liquid is arranged in the second circulation cavity;

the plunger rod, the one end of plunger rod wears to locate the second and leads to the chamber to set up in first and lead to the intracavity, plunger rod and pump body swing joint, and the direction of activity of plunger rod is the direction towards first and the direction that deviates from first and leads to the chamber.

Optionally, a movable cavity is further arranged on the pump body, and the plunger rod is movably arranged in the movable cavity.

Optionally, the high-pressure constant flow pump further comprises a first sealing ring, the first sealing ring is fixed on the inner wall of the movable cavity and sleeved on the plunger rod, and the first flow cavity is sealed through the first sealing ring and the plunger rod.

Optionally, the high-pressure constant flow pump further comprises a second sealing ring, the second sealing ring is fixed on the inner wall of the movable cavity and sleeved on the plunger rod, the second flow cavity is located between the first sealing ring and the second sealing ring, and the second flow cavity is sealed through the first sealing ring, the second sealing ring and the plunger rod.

Optionally, the pump body is further provided with a liquid inlet and a liquid outlet, and the liquid inlet and the liquid outlet are communicated with the second flow cavity.

Optionally, the high-pressure constant flow pump further comprises a motor, and the other end of the plunger rod is in transmission connection with the motor, so that the plunger rod can reciprocate in a direction towards the first flow cavity and a direction away from the first flow cavity.

Optionally, the high-pressure constant-flow pump further comprises an eccentric shaft, a first transmission bearing and a push rod, wherein the driving end of the motor is connected with one end of the eccentric shaft, the first transmission bearing is sleeved and fixed on an eccentric wheel of the eccentric shaft, and two ends of the push rod are respectively connected with an outer ring of the first transmission bearing and the other end of the plunger rod.

Optionally, the high-pressure constant flow pump further comprises a fixed sleeve and an elastic element, the fixed sleeve is fixed in the movable cavity, the plunger rod penetrates through the fixed sleeve, a boss is arranged at the other end of the plunger rod, the boss extends along the axial direction deviating from the plunger rod, the elastic element is sleeved on the plunger rod, two ends of the elastic element are respectively connected with the fixed sleeve and one side end face of the boss, when the motor drives the plunger rod to move towards the direction of the first circulation cavity, the elastic element compresses, and the elastic element enables the other side end face of the boss to be in butt joint with the push rod.

Optionally, the elastic element is a pressure spring.

Optionally, the high-pressure constant flow pump further comprises a linear bearing, the linear bearing is sleeved on the push rod, and the outer ring of the linear bearing is fixed in the movable cavity.

The beneficial effects are that:

according to the high-pressure constant flow pump provided by the utility model, the second circulation cavity is formed in the pump body, the cleaning liquid is arranged in the second circulation cavity, one end of the plunger rod penetrates through the second circulation cavity and is arranged in the first circulation cavity, and when the plunger rod moves towards the direction of the first circulation cavity and moves away from the direction of the first circulation cavity, the plunger rod can move in the second circulation cavity, so that the effect of cleaning crystals on the outer surface of the plunger rod is realized.

Drawings

FIG. 1 is a schematic diagram of a three-dimensional structure of a high-pressure constant-flow pump provided by the utility model;

FIG. 2 is a schematic plan view of a high-pressure constant-flow pump according to the present utility model;

FIG. 3 is a cross-sectional view taken along the direction A-A in FIG. 2;

FIG. 4 is a schematic plan view of a high-pressure constant-flow pump according to the second embodiment of the present utility model;

fig. 5 is a sectional view in the direction B-B of fig. 4.

In the figure:

100. a pump body; 110. a first flow-through chamber; 120. a second flow-through chamber; 130. a movable cavity; 141. a liquid inlet hole; 142. a liquid outlet hole; 200. a plunger rod; 210. a boss; 310. a first seal ring; 320. a second seal ring; 410. a motor; 411. a rotating shaft at the driving end of the motor; 420. an eccentric shaft; 431. a first drive bearing; 4311. a rotating shaft of the first transmission bearing; 432. a second drive bearing; 433. a third drive bearing; 440. a push rod; 450. a linear bearing; 510. a fixed sleeve; 520. an elastic element; 610. a first valve body; 620. a second valve body; 700. a bottom plate; 810. an optocoupler baffle; 820. an origin optocoupler.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood as appropriate by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

The embodiment provides a high-pressure constant flow pump, and the high-pressure constant flow pump has the effect of cleaning crystals on the outer surface of a plunger rod.

Specifically, as shown in fig. 1 to 3, the high-pressure constant flow pump includes a bottom plate 700, a pump body 100 and a plunger rod 200, the pump body 100 is fixed on the bottom plate 700, a first flow cavity 110 and a second flow cavity 120 are provided on the pump body 100, the first flow cavity 110 is used for conveying liquid to be conveyed, a cleaning solution is provided in the second flow cavity 120, one end of the plunger rod 200 penetrates through the second flow cavity 120 and is disposed in the first flow cavity 110, the plunger rod 200 is movably connected with the pump body 100, and the moving direction of the plunger rod 200 is the direction facing the first flow cavity 110 and the direction deviating from the first flow cavity 110.

The high-pressure constant flow pump is provided with the second flow cavity 120 on the pump body 100, cleaning liquid is arranged in the second flow cavity 120, one end of the plunger rod 200 penetrates through the second flow cavity 120 and is arranged in the first flow cavity 110, when the plunger rod 200 moves towards the first flow cavity 110 and moves away from the first flow cavity 110, the plunger rod 200 can move in the second flow cavity 120, and the effect of cleaning crystals on the outer surface of the plunger rod 200 is achieved.

Preferably, as shown in fig. 1 to 3, the pump body 100 is further provided with a liquid inlet 141 and a liquid outlet 142, both the liquid inlet 141 and the liquid outlet 142 are communicated with the second circulation cavity 120, and the cleaning liquid enters the second circulation cavity 120 through the liquid inlet 141 and is discharged from the second circulation cavity 120 through the liquid outlet 142, so that the cleaning liquid in the second circulation cavity 120 is in a flowing state, and further the cleaning effect on the plunger rod 200 can be improved.

Optionally, as shown in fig. 1 to 3, the high-pressure constant-flow pump further includes a first valve body 610 and a second valve body 620, where the first valve body 610 and the second valve body 620 are both check valves and are both communicated with the first flow cavity 110, one of the first valve body 610 and the second valve body 620 is a liquid inlet valve, and the other is a liquid outlet valve, in this embodiment, the first valve body 610 is used as a liquid inlet valve, the second valve body 620 is used as a liquid outlet valve, and the liquid to be conveyed enters the first flow cavity 110 through the first valve body 610 and is discharged out of the first flow cavity 110 through the second valve body 620.

Optionally, as shown in fig. 1 to 3, the pump body 100 is further provided with a movable cavity 130, and the plunger rod 200 is movably disposed in the movable cavity 130.

Further, as shown in fig. 1 to 3, the high-pressure constant flow pump further includes a first sealing ring 310, where the first sealing ring 310 is fixed on the inner wall of the movable cavity 130 and sleeved on the plunger rod 200, the first flow cavity 110 realizes sealing with the plunger rod 200 through the first sealing ring 310, so as to avoid the problem of leakage of the liquid to be conveyed in the first flow cavity 110, and the setting of the first sealing ring 310 realizes a radial limiting effect on the plunger rod 200, so as to restrict the radial degree of freedom of the plunger rod 200.

Further, as shown in fig. 1 to 3, the high-pressure constant-flow pump further includes a second sealing ring 320, where the second sealing ring 320 is fixed on the inner wall of the movable cavity 130 and sleeved on the plunger rod 200, the second flow cavity 120 is located between the first sealing ring 310 and the second sealing ring 320, and the second flow cavity 120 is sealed by the first sealing ring 310, the second sealing ring 320 and the plunger rod 200, so that the problem of leakage of cleaning fluid in the second flow cavity 120 is avoided, and the radial limiting effect of the plunger rod 200 is further improved by the arrangement of the second sealing ring 320.

Optionally, when the plunger rod 200 moves toward the first flow chamber 110, the volume of the first flow chamber 110 is reduced, the internal pressure is increased, and the volume and the internal pressure of the second flow chamber 120 are not changed along with the movement of the plunger rod 200, so the first sealing ring 310 is a high-pressure sealing ring, and the second sealing ring 320 is a low-pressure sealing ring.

Optionally, as shown in fig. 1 to 3, the high-pressure constant flow pump further includes a motor 410, and the other end of the plunger rod 200 is in driving connection with the motor 410, so that the plunger rod 200 can reciprocate in a direction toward the first flow chamber 110 and a direction away from the first flow chamber 110. Preferably, the motor 410 is a progressive motor 410, so that the push rod 440 and the plunger rod 200 can move stably.

Further, as shown in fig. 1 to 5, the high-pressure constant flow pump further comprises an eccentric shaft 420, a first transmission bearing 431 and a push rod 440, wherein the driving end of the motor 410 is connected with one end of the eccentric shaft 420, the first transmission bearing 431 is sleeved and fixed on an eccentric wheel of the eccentric shaft 420, one end of the push rod 440 is fixedly connected with an outer ring of the first transmission bearing 431, and the other end of the push rod 440 is connected with the other end of the plunger rod 200, so that the driving connection between the plunger rod 200 and the motor 410 is realized; on the other hand, the transmission push rod in the prior art is directly connected with the output end of the motor, the structure is set to need to turn the motor to switch, so that the reciprocating linear movement of the transmission push rod and the plunger rod can be realized, in the technical scheme provided by the embodiment, the push rod 440 is in transmission connection with the motor 410 through the eccentric shaft 420 and the first transmission bearing 431, the rotating shaft 4311 of the first transmission bearing and the rotating shaft of the driving end of the motor 410 are staggered with each other due to the arrangement of the eccentric shaft 420, the first transmission bearing 431 can do circular movement around the rotating shaft of the driving end of the motor 410 in the process of rotating the driving end of the motor 410, and then the push rod 440 fixed on the outer ring of the first transmission bearing 431 drives the plunger rod 200 to do reciprocating linear movement, namely, the reciprocating linear movement of the plunger rod 200 can be realized without turning the motor 410 to switch, so that the response time of the turning the motor 410 to switch is omitted, and the efficiency of the constant current pump is improved.

Optionally, as shown in fig. 1 to 5, the shaft body of the eccentric shaft 420 is further sleeved with a second transmission bearing 432 and a third transmission bearing 433, and the first transmission bearing 431 is located between the second transmission bearing 432 and the third transmission bearing 433, so as to improve the rotation stability of the eccentric shaft 420.

Optionally, as shown in fig. 1 to 5, the high-pressure constant flow pump further includes a linear bearing 450, the linear bearing 450 is sleeved on the push rod 440, and an outer ring of the linear bearing 450 is fixed in the movable cavity 130, and the radial limiting effect on the push rod 440 is achieved by the arrangement of the linear bearing 450, so as to restrict the radial degree of freedom of the push rod 440.

Optionally, as shown in fig. 1 to 5, the high-pressure constant-flow pump further comprises a fixed sleeve 510 and an elastic element 520, the fixed sleeve 510 is fixed in the movable cavity 130, the plunger rod 200 is arranged through the fixed sleeve 510, the other end of the plunger rod 200 is provided with a boss 210, the boss 210 extends along the axial direction deviating from the plunger rod 200, the elastic element 520 is sleeved on the plunger rod 200, two ends of the elastic element 520 are respectively connected with one side end surface of the fixed sleeve 510 and one side end surface of the boss 210, when the motor 410 drives the plunger rod 200 to move towards the first flow cavity 110, the elastic element 520 compresses, the other side end surface of the boss 210 is abutted by the resilience force of the elastic element 520, and in the process of reciprocating together with the plunger rod 440 and the plunger rod 200, the other side end surface of the boss 210 can be always tightly attached to the end surface of the plunger rod 440, so as to realize floating connection of the plunger rod 200 and the plunger rod 440, the connection mode has the effect of reducing the abrasion probability of the first sealing ring 310 and the second sealing ring 320, specifically, if the plunger rod 200 and the push rod 440 are fixedly connected by adopting the screw matching mode of the internal screw and the external screw, or the plunger rod 200 and the push rod 440 are fixedly connected by bolts, connection holes are respectively required to be formed on the plunger rod 200 and the push rod 440, if the coaxiality of the connection holes on the plunger rod 200 and the connection holes on the push rod 440 is lower, radial acting force is generated between the plunger rod 200 and the push rod 440 after the plunger rod 200 is fixedly connected, and the radial acting force is transmitted to the first sealing ring 310 and the second sealing ring 320 by the plunger rod 200, so that the abrasion problem is very easy to occur on the first sealing ring 310 and the second sealing ring 320 after the plunger rod 200 reciprocates for a long time, the service life of the first sealing ring 310 and the second sealing ring 320 is shortened, the pressure-resistant constant current performance of the high-pressure pump is also reduced, in the technical scheme provided in this embodiment, the plunger rod 200 and the push rod 440 are mutually abutted through the resilience force of the elastic element 520, so that the problem that the wear rate of the first sealing ring 310 and the second sealing ring 320 is high due to low coaxiality of the two connecting holes is solved from the source, the service life of the first sealing ring 310 and the second sealing ring 320 is effectively prolonged, the pressure resistance of the high-pressure constant-flow pump is also improved, and from the viewpoint of processing, the connecting holes with higher coaxiality are respectively formed in the plunger rod 200 and the push rod 440, the effects of reducing the processing difficulty and the processing cost are achieved, if the abutting stability of the other side end face of the boss 210 and the push rod 440 is improved, only the flatness of the other side end face of the boss 210 and the one side end face of the push rod 440 is required to be improved, from the viewpoint of assembling, the elastic element 520 is only required to be sleeved on the plunger rod 200, and the two ends of the elastic element 520 are respectively connected with the one side end faces of the fixing sleeve 510 and the boss 210, and the assembling difficulty is greatly reduced, and the assembling efficiency is improved. It should be noted that, the two ends of the elastic element 520 may be fixedly connected or detachably connected to the fixing sleeve 510 and one side end surface of the boss 210.

It should be noted that, in the technical solution provided in this embodiment, the first sealing ring 310 and the second sealing ring 320 radially limit the plunger rod 200, and the linear bearing 450 radially limits the push rod 440, so that the separation between the radial limit of the plunger rod 200 and the radial limit of the push rod 440 is achieved, and the abrasion probability of the first sealing ring 310 and the second sealing ring 320 is further reduced.

Optionally, when the plunger rod 200 moves to the maximum distance from the first flow chamber 110 (i.e. when the volume of the first flow chamber 110 is the maximum), the elastic element 520 may be in a natural state or a compressed state, if the elastic element 520 is in the natural state, and when the volume of the first flow chamber 110 is the maximum, the other end face of the boss 210 and the push rod 440 are attached to each other, and after the push rod 440 moves toward the direction of the first flow chamber 110, the elastic element 520 is compressed, so that the other end face of the boss 210 is abutted to the push rod 440; if the elastic element 520 is in a compressed state, when the volume of the first flow chamber 110 is the largest, the other end face of the boss 210 abuts against the push rod 440, and after the push rod 440 moves towards the direction of the first flow chamber 110, the elastic element 520 continues to compress, and the abutting force between the other end face of the boss 210 and the push rod 440 increases, so that the floating connection relationship between the plunger rod 200 and the push rod 440 is more reliable.

Alternatively, the elastic element 520 is a pressure spring, and of course, in other embodiments, the elastic element 520 may be another element with elastic properties, such as youli glue.

Optionally, as shown in fig. 1 to 5, the high-pressure constant-flow pump further includes an optocoupler baffle 810 and an origin optocoupler 820, so as to realize resetting of the high-pressure constant-flow pump.

In the high-pressure constant-flow pump provided by the embodiment, in the process of reciprocating movement of the plunger rod 200, the crystal on the outer surface of the plunger rod 200 can be cleaned by the cleaning liquid in the second circulation cavity 120, so that the wear rate of the first sealing ring 310 and the second sealing ring 320 is greatly reduced, on the other hand, the plunger rod 200 and the push rod 440 are in floating connection through the elastic element 520, the connection holes are omitted on the plunger rod 200 and the push rod 440 respectively, the problem of wear of the first sealing ring 310 and the second sealing ring 320 caused by low coaxiality of the two connection holes is avoided from the source, the wear rate of the first sealing ring 310 and the second sealing ring 320 is reduced, the service lives of the first sealing ring 310 and the second sealing ring 320 are prolonged, the pressure resistance of the high-pressure constant-flow pump is improved, on the other hand, the push rod 440 and the motor 410 are in transmission connection through the eccentric shaft 420 and the first transmission bearing 431, the response time of steering switching of the motor 410 is omitted, the efficiency of the high-pressure constant-flow pump is improved, and the high-pressure constant-flow pump is applied to a glycosylated hemoglobin analyzer, and the service life and maintenance period of the whole set of the instrument can be effectively prolonged.

The working process of the high-pressure constant-flow pump provided in this embodiment is briefly described below:

referring to fig. 1 to 5, the origin optocoupler 820 is reset, the motor 410 drives the eccentric shaft 420 to rotate clockwise at a high speed, the first transmission bearing 431 drives the push rod 440 to perform reciprocating linear motion, under the action of resilience force of the elastic element 520, the other side end surface of the boss 210 is abutted against the push rod 440, so that the plunger rod 200 and the push rod 440 can perform reciprocating linear motion together, when the plunger rod 200 moves away from the first flow cavity 110, the volume of the first flow cavity 110 is increased, the first valve body 610 is opened, the second valve body 620 is closed, the liquid pumping function is realized, when the plunger rod 200 moves towards the first flow cavity 110, the volume of the first flow cavity 110 is reduced, the second valve body 620 is opened, the first valve body 610 is closed, the liquid draining function is realized, and thus the stable conveying effect of liquid to be conveyed is achieved; during the reciprocating movement of the plunger rod 200, the second flow chamber 120 is flowed with a cleaning solution to clean crystals on the outer surface of the plunger rod 200.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the utility model. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. The high-pressure constant flow pump is characterized by comprising:

the cleaning device comprises a pump body (100), wherein a first circulation cavity (110) and a second circulation cavity (120) are arranged on the pump body (100), the first circulation cavity (110) is used for conveying liquid to be conveyed, and cleaning liquid is arranged in the second circulation cavity (120);

the plunger rod (200), the one end of plunger rod (200) wears to locate second circulation chamber (120), and set up in first circulation chamber (110), plunger rod (200) with pump body (100) swing joint, just the direction of activity of plunger rod (200) is the orientation first circulation chamber (110) the direction with deviate from the direction in first circulation chamber (110).

2. The high-pressure constant-flow pump according to claim 1, wherein the pump body (100) is further provided with a movable cavity (130), and the plunger rod (200) is movably arranged in the movable cavity (130).

3. The high-pressure constant flow pump according to claim 2, further comprising a first sealing ring (310), wherein the first sealing ring (310) is fixed on the inner wall of the movable cavity (130) and sleeved on the plunger rod (200), and the first circulation cavity (110) is sealed by the first sealing ring (310) and the plunger rod (200).

4. A high pressure constant flow pump according to claim 3, further comprising a second sealing ring (320), wherein the second sealing ring (320) is fixed on the inner wall of the movable cavity (130) and sleeved on the plunger rod (200), the second circulation cavity (120) is located between the first sealing ring (310) and the second sealing ring (320), and the second circulation cavity (120) is sealed by the first sealing ring (310), the second sealing ring (320) and the plunger rod (200).

5. The high-pressure constant flow pump according to any one of claims 2 to 4, wherein the pump body (100) is further provided with a liquid inlet hole (141) and a liquid outlet hole (142), and both the liquid inlet hole (141) and the liquid outlet hole (142) are communicated with the second flow cavity (120).

6. The high-pressure constant flow pump according to any one of claims 2-4, further comprising a motor (410), the other end of the plunger rod (200) being in driving connection with the motor (410) such that the plunger rod (200) is reciprocally movable in a direction towards the first flow chamber (110) and in a direction away from the first flow chamber (110).

7. The high-pressure constant flow pump according to claim 6, further comprising an eccentric shaft (420), a first transmission bearing (431) and a push rod (440), wherein the driving end of the motor (410) is connected with one end of the eccentric shaft (420), the first transmission bearing (431) is sleeved and fixed on an eccentric wheel of the eccentric shaft (420), and two ends of the push rod (440) are respectively connected with an outer ring of the first transmission bearing (431) and the other end of the plunger rod (200).

8. The high-pressure constant flow pump according to claim 7, further comprising a fixing sleeve (510) and an elastic element (520), wherein the fixing sleeve (510) is fixed in the movable cavity (130), the plunger rod (200) is arranged in the fixing sleeve (510) in a penetrating manner, a boss (210) is arranged at the other end of the plunger rod (200), the boss (210) extends along the axial direction deviating from the plunger rod (200), the elastic element (520) is sleeved on the plunger rod (200), two ends of the elastic element (520) are respectively connected with the fixing sleeve (510) and one side end face of the boss (210), and when the motor (410) drives the plunger rod (200) to move towards the direction of the first circulation cavity (110), the elastic element (520) is compressed, and the elastic element (520) enables the other side end face of the boss (210) to be abutted against the push rod (440) through the resilience force of the elastic element (520).

9. The high pressure constant flow pump according to claim 8, wherein the elastic element (520) is a pressure spring.

10. The high-pressure constant flow pump according to claim 7, further comprising a linear bearing (450), wherein the linear bearing (450) is sleeved on the push rod (440), and an outer ring of the linear bearing (450) is fixed in the movable cavity (130).

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