A high-precision springless multi-plunger power mechanism

Abstract

The utility model relates to the technical field of plunger pump, concretely provides a kind of high-precision springless multi-plunger power mechanism.The utility model includes power rod, camshaft and plunger mechanism, camshaft is equipped with cam and plunger mechanism cooperation, cam is equipped with first working surface, and first working surface is the cooperation surface of cam away from power rod and plunger mechanism, and plunger mechanism includes at least two mutually parallel plunger connecting rods, and first working surface and the axial direction of camshaft have included angle;Every plunger connecting rod is equipped with at least three bearings near cam side, and bearing includes first bearing, and first bearing and first working surface are close.The utility model can realize the reciprocating motion of the multi-plunger of super-long period stability under each complex environment, high-precision liquid suction and liquid delivery, and adopt the accurate delivery of non-pulsation of multi-plunger power mechanism.

Description

Technical Field

[0001] This utility model relates to the field of plunger pump technology, and specifically provides a high-precision, springless multi-plunger power mechanism. Background Technology

[0002] Most existing plunger pumps use a cam to push the plunger rod and a spring to pull it back. In this design, the spring has a short lifespan, and aging springs can cause delayed rebound, resulting in insufficient plunger suction, flow pulsation, and decreased accuracy. In environments like chemical plants and laboratories, where acidic corrosive gases are frequently present, springs are prone to accelerated aging and even breakage. Existing technology CN105626487B A pulsation-free plunger pump includes a motor, a pump body, and a drive shaft, push plates, a main diaphragm, and a flow divider seat housed within the pump body. The motor's power end is connected to the drive shaft, which has a cam. Two push plates are positioned on opposite sides of the cam and abut against it. The push plates are connected to the main diaphragm via guide rods. The pump body has an inlet and an outlet. The flow divider seat and the two diaphragms form independent material chambers, and the inlet and outlet are individually connected to each material chamber. Both the inlet and outlet have check valves. The two diaphragms are driven by guide rods connected to them and alternately compress their respective material chambers. The pump body also includes a secondary diaphragm. The edge of the secondary diaphragm is fixed to the pump body, and the secondary diaphragm can be driven by a guide rod connected to the main diaphragm and slides in the same direction as the main diaphragm. A sealed buffer chamber is formed between the secondary diaphragm and the primary diaphragm; the buffer chamber is filled with hydraulic oil; the pump body also has a bearing seat; the guide rod includes a secondary diaphragm guide rod and a primary diaphragm guide rod, each with a bearing housing, and the bearing seat supports the bearing; a secondary diaphragm pressure plate and a secondary diaphragm connecting seat are installed on the secondary diaphragm guide rod, and the secondary diaphragm is clamped between the secondary diaphragm pressure plate and the secondary diaphragm connecting seat; the secondary diaphragm pressure plate and the secondary diaphragm connecting seat are connected by screws, and the threaded end of the screw is threaded to the end face of the secondary diaphragm guide rod near the secondary diaphragm; the secondary diaphragm has a through hole in its center; the secondary diaphragm pressure plate and the secondary diaphragm connecting seat cooperate to press the periphery of the secondary diaphragm near the through hole, and seal the connection between the through hole and the screw; the two buffer chambers are located on both sides of the flow divider. The push plate in the prior art cannot prevent the camshaft from deflecting and surging during the reciprocating switching of the plunger structure. The inventors believe that there is significant room for improvement in the prior art. Utility Model Content

[0003] The purpose of this invention is to solve the risks of untimely spring rebound, easy spring fatigue, and easy breakage. Secondly, the plunger return stroke uses a cam curve for direct pull-back, achieving higher precision in plunger stroke; the cam curve enables pulsation-free liquid delivery and suction; the multi-plunger power mechanism adopts a fully enclosed structure, achieving long-term stable use; and it avoids deflection and axial movement of the plunger during reciprocating switching. Therefore, this invention provides a high-precision, springless multi-plunger power mechanism, including a power rod, a camshaft, and a plunger mechanism. The camshaft has a cam that cooperates with the plunger mechanism. The cam has a first working surface, which is the surface of the cam that mates with the plunger mechanism away from the power rod. The plunger mechanism includes at least two parallel plunger connecting rods. The first working surface and the camshaft axis form an angle. Each plunger connecting rod has at least three bearings near the cam side, including a first bearing, which is in close contact with the first working surface. By employing a first bearing and a first working surface of the cam in close contact, axial movement of the cam shaft away from the power rod is prevented, thus avoiding lag in the linear movement response of the plunger mechanism to the rotational movement of the camshaft and preventing pulsation during fluid delivery. The first working surface, which forms an angle with the camshaft axis, engages with the first bearing to drive the plunger connecting rod during the cam's axial lift, improving the accuracy and response speed of the plunger connecting rod movement. This replaces the spring structure, which is prone to aging and even breakage, enabling long-term stable use of the multi-plunger power mechanism, extending its service life, and improving the mechanism's stability. Furthermore, the spring structure is prone to aging and changes in elastic modulus in harsh environments, improving the accuracy and precision of the plunger connecting rod movement.

[0004] Preferably, the cam has a second working surface, which is the mating surface of the cam near the power rod and the plunger mechanism. The second working surface and the camshaft axis form an angle. The bearing includes a second bearing, and the second working surface of the second bearing is in close contact with the cam. By having the second working surface in close contact with the second bearing, axial movement of the camshaft near the power rod is prevented. The use of a second working surface with an angle opposite to the camshaft axis in conjunction with the second bearing enables the plunger connecting rod to be pulled back during the cam curve return stroke. Both the pull-back and push-back plunger connecting rods utilize the cam curve, which reduces the pulsation during fluid delivery and suction in the multi-plunger power mechanism, improves the accuracy of the plunger connecting rod stroke, and reduces cavitation. The camshaft and bearing mating provides high wear resistance and eliminates the need for repeated deformation, enabling long-term use of the multi-plunger power structure and improving the reliability of the plunger connecting rod pull-back process.

[0005] Preferably, the multi-plunger power mechanism includes a guide mechanism and a housing. One side of the guide mechanism connects the camshaft and the plunger mechanism, and the other side connects to the power rod. A first sealing ring is provided between the housing and the guide mechanism. The guide mechanism connects the camshaft, the plunger mechanism, and the power rod, and prevents the camshaft from deflecting under the reciprocating motion of the plunger mechanism.

[0006] Preferably, the guiding mechanism includes a guide sleeve with at least two guide cavities corresponding to the plunger connecting rods of the plunger mechanism; the bearing includes a third bearing, one end of which is disposed inside the guide cavity, and the other end of which can slide within the guide cavity. The plunger mechanism includes multiple plunger connecting rods, each with a third bearing that cooperates with the guide cavity to prevent relative deflection between the camshaft and the plunger connecting rods.

[0007] Preferably, a camshaft mounting hole is provided at the axis position of the guide mechanism, with one end of the camshaft mounting hole connected to the camshaft and the other end connected to the power rod.

[0008] Preferably, guide cavities are evenly distributed around the circumference of the guide sleeve, and the guide cavities connect the cam mounting hole and the outer circle of the guide sleeve. Connecting the cam mounting hole and the outer circle of the guide sleeve with guide cavities facilitates the lubrication of the camshaft's outer surface by external oil through the guide cavities; the evenly distributed guide cavities around the circumference of the guide sleeve also facilitate the replenishment of external oil at uniform time intervals, maintaining lubrication of the camshaft's outer surface.

[0009] Preferably, the guide cavity includes a plunger mounting portion and a bearing mating portion. The plunger mounting portion mates with the plunger connecting rod, and the bearing mating portion mates with a third bearing. The third bearing slides along the inner wall of the bearing mating portion. Dividing the guide cavity into the plunger mounting portion and the bearing mating portion reduces the area requiring precision machining, which helps reduce machining costs. Simultaneously, it facilitates control over the machining requirements at various positions within the guide cavity. The plunger mounting portion needs to be machined to the precision required for the mounting fit between the guide cavity and the plunger connecting rod, and the bearing mating portion needs to be machined to prevent relative deflection between the plunger connecting rod and the camshaft when the third bearing slides along the inner wall of the bearing mating portion.

[0010] Preferably, the housing is equipped with a cover plate, the cover plate has an oil hole, and a housing sealing ring is provided between the cover plate and the housing. The housing sealing ring and cover plate maintain the multi-plunger power mechanism in a fully enclosed state for extended periods. This long-term fully enclosed state prevents external debris from entering the housing and ensures stable long-term operation of the multi-plunger power mechanism. The oil hole allows for the addition of lubricating oil, eliminating the need to remove the cover plate and housing for lubrication of the multi-plunger power mechanism.

[0011] This invention addresses the risks of delayed spring rebound, fatigue, and breakage in complex environments. The plunger connecting rod return stroke utilizes a cam curve for direct pull-back, achieving higher precision. The cam curve enables pulsation-free infusion and aspiration. The multi-plunger power mechanism employs a fully enclosed structure for long-term stable operation. It achieves ultra-long-term stable multi-plunger reciprocating motion, high-precision aspiration and delivery, and pulsation-free accurate delivery. Furthermore, it features the following advantages: the first and second bearings are tightly fitted to the camshaft from both sides. The cam design prevents the plunger connecting rod from deflecting and swerving during reciprocating switching. A third bearing is used in conjunction with the guide mechanism to prevent the camshaft from deflecting under the reciprocating motion of the plunger mechanism. The guide cavity is divided into a plunger mounting part and a bearing mating part, which reduces the area of ​​the guide cavity that needs to be precision machined, thus reducing machining costs. At the same time, it is beneficial to control the machining requirements of each position in the guide cavity. The plunger mounting part needs to be machined to the installation and fitting accuracy between the guide cavity and the plunger connecting rod. The bearing mating part needs to be machined to the point that when the third bearing slides along the inner wall of the bearing mating part, the plunger connecting rod and the camshaft should not deflect relative to each other. Attached Figure Description

[0012] To more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the multi-plunger power structure of this utility model;

[0014] Figure 2 This is a cross-sectional view of the multi-plunger power structure of this utility model;

[0015] Figure 3 This is a schematic diagram of the guide bushing, camshaft, and plunger mechanism of this utility model;

[0016] Figure 4 This is a front view of the guide bushing, camshaft, and plunger mechanism of this utility model;

[0017] Figure 5 This is a cross-sectional view of the guide bushing, camshaft, and plunger mechanism of this utility model;

[0018] Figure 6 This is a cross-sectional view of the plunger mechanism of this utility model;

[0019] Figure 7 This is a schematic diagram of the structure of the guide bushing of this utility model;

[0020] Figure 8 This is a cross-sectional schematic diagram of the lubrication structure according to Embodiment 2 of this utility model;

[0021] Figure 9 This is a cross-sectional view of the guide bushing, camshaft, and plunger mechanism of Embodiment 2 of this utility model.

[0022] Explanation of reference numerals in the attached drawings: 1. Power rod; 2. Housing; 3. Cover plate; 4. Guide mechanism; 401. Guide bushing; 402. Plunger mounting part; 403. Bearing mating part; 5. Plunger mechanism; 501. First bearing; 502. Second bearing; 503. Third bearing; 504. Plunger connecting rod; 6. Camshaft; 601. First working surface; 602. Second working surface; 7. First sealing ring; 8. Lubrication structure; 801. Plunger oil passage; 802. Bearing horizontal oil passage; 803. Bearing vertical oil passage. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0024] Example 1

[0025] Combination Figure 1 , Figure 2 and Figure 4As shown, a high-precision, springless multi-plunger power mechanism includes a power rod 1, a housing 2, a cover plate 3, a guide mechanism 4, a plunger mechanism 5, a camshaft 6, and a first sealing ring 7. The plunger mechanism 5 is provided with a plunger connecting rod 504 that cooperates with the camshaft 6. The camshaft 6 is provided with a cam that cooperates with the plunger mechanism 5. The cam is provided with a first working surface 601, which is the surface of the cam that cooperates with the plunger mechanism 5 away from the power rod 1. The plunger mechanism 5 includes three parallel plunger connecting rods 504. The first working surface 601 and the axial direction of the camshaft 6 have an angle. Each plunger connecting rod 504 is provided with three bearings near the cam side. The bearings include a first bearing 501, which is in close contact with the first working surface 601. One end of the first bearing 501 is fixed inside the plunger connecting rod 504, and the other end is in close contact with the first working surface 601 of the cam. In this embodiment, the connection end between the first bearing 501 and the plunger connecting rod 504 is a locating pin, which facilitates the installation or removal of the first bearing 501. The contact end between the first bearing 501 and the first working surface 601 is a cylindrical surface, which reduces the friction between the camshaft 6 and the first bearing 501 during operation, and avoids wear between the first bearing 501 and the first working surface 601, which would cause the plunger mechanism 5 to respond lagly during the cam curve lift and cause pulsation in the liquid delivery of the multi-plunger power mechanism. By using the first bearing 501 and the first working surface 601 of the cam to be in close contact, the camshaft 6 is prevented from moving away from the power rod 1, and the gap between the first bearing 501 and the first working surface 601 is avoided, which would cause the plunger mechanism 5 to respond lagly, the plunger connecting rod 504 to have an error in its stroke, and the multi-plunger power mechanism to cause pulsation in the liquid delivery. The first working surface 601, which has an angle with the axial direction of the camshaft 6, cooperates with the first bearing 501 to push the plunger connecting rod 504 to move during the cam curve lift.

[0026] Combination Figure 2 and Figure 4As shown, the cam has a second working surface 602, which is the mating surface between the cam and the plunger mechanism 5 near the power rod 1. The second working surface 602 and the axial direction of the camshaft 6 form an angle. The bearing includes a second bearing 502, and the second working surface 602 of the second bearing 502 is in close contact with it. In this embodiment, the connection end between the second bearing 502 and the plunger connecting rod 504 is a positioning pin, which facilitates the installation or removal of the second bearing 502. The contact end between the second bearing 502 and the second working surface 602 is a cylindrical surface, which reduces the friction between the camshaft 6 and the second bearing 502 during operation, and avoids wear of the second bearing 502 and the gap between it and the second working surface 602, which would cause the plunger mechanism 5 to respond lagly during the cam curve return and cause pulsation in the liquid delivery of the multi-plunger power mechanism. The second working surface 602 is tightly fitted with the second bearing 502 to prevent the camshaft 6 from shifting towards the power rod 1 and to avoid gaps between the second bearing 502 and the second working surface 602, which could cause lag in the response of the plunger mechanism 5, errors in the stroke of the plunger connecting rod 504, and pulsations in the liquid delivery of the multi-plunger power mechanism. The second working surface 602, which has an angle opposite to the axis of the camshaft 6, cooperates with the second bearing 502 to achieve the pullback of the plunger connecting rod 504 during the cam curve return stroke. Both the pullback and push of the plunger connecting rod 504 utilize cam curves, which can reduce pulsations in the liquid delivery and suction of the multi-plunger power mechanism, improve the accuracy of the plunger connecting rod 504 stroke, and reduce cavitation. The camshaft 6 and bearing have high wear resistance, enabling long-term use of the multi-plunger connecting rod 504 power structure and improving the reliability of the plunger connecting rod 504 pullback process.

[0027] Combination Figure 1 , Figure 2 and Figure 3 As shown, the multi-plunger power mechanism includes a guide mechanism 4 and a housing 2. One side of the guide mechanism 4 connects the camshaft 6 and the plunger mechanism 5, and the other side connects to the power rod 1. A first sealing ring 7 is provided between the housing 2 and the guide mechanism 4. The guide mechanism 4 connects the camshaft 6 and the plunger mechanism 5 with the power rod 1, and prevents the camshaft 6 from deflecting under the action of the reciprocating motion of the plunger mechanism 5.

[0028] Combination Figure 3 , Figure 6 and Figure 7As shown, the guide mechanism 4 includes a guide sleeve 401, which has three guide cavities corresponding to the plunger connecting rod 504 of the plunger mechanism 5. The bearing includes a third bearing 503, one end of which is disposed inside the guide cavity, and the other end of which can slide within the guide cavity. In this embodiment, the connection end between the third bearing 503 and the plunger connecting rod 504 is a positioning pin, which facilitates the installation or removal of the third bearing 503. The contact end between the third bearing 503 and the guide cavity is a cylindrical surface, which reduces the friction between the third bearing 503 and the guide cavity during operation and prevents wear of the third bearing 503 from creating a gap between it and the guide cavity, causing the third bearing 503 to wobble in the guide cavity in a direction perpendicular to the axis, resulting in relative deflection of the camshaft 6 and the plunger connecting rod 504. The plunger mechanism 5 includes three plunger connecting rods 504, each with a third bearing 503. The third bearing 503 engages with the guide cavity to prevent relative deflection between the camshaft 6 and the plunger connecting rod 504. Since one end of the plunger connecting rod 504 is fixed to the guide mechanism 4 and the other end is fixed to the housing 2, if the plunger connecting rod 504 deflects relative to the camshaft 6, it is susceptible to torsional torque, which can lead to overall damage to the plunger connecting rod 504.

[0029] like Figure 2 As shown, the guide mechanism 4 has a camshaft 6 mounting hole at the axis position. One end of the camshaft 6 mounting hole is connected to the camshaft 6, and the other end is connected to the power rod 1.

[0030] Combination Figure 3 , Figure 6 and Figure 7 As shown, the guide sleeve 401 has three guide cavities evenly distributed around its circumference, and the guide cavities connect the cam mounting hole and the outer circle of the guide sleeve 401. The use of guide cavities connecting the cam mounting hole and the outer circle of the guide sleeve 401 facilitates the lubrication of the outer surface of the camshaft 6 by external oil through the guide cavities; the evenly distributed guide cavities around the circumference of the guide sleeve 401 also facilitate the replenishment of external oil at uniform time intervals, maintaining lubrication of the outer surface of the camshaft 6.

[0031] Combination Figure 6 and Figure 7As shown, the guide cavity includes a plunger mounting portion 402 and a bearing mating portion 403. The plunger mounting portion 402 mates with the plunger connecting rod 504, and the bearing mating portion 403 mates with the third bearing 503. The third bearing 503 slides along the inner wall of the bearing mating portion 403. Dividing the guide cavity into the plunger mounting portion 402 and the bearing mating portion 403 reduces the area requiring precision machining, which helps lower machining costs. Simultaneously, it facilitates control over the machining requirements at various positions within the guide cavity. The plunger mounting portion 402 needs to be machined to the required precision for the installation fit between the guide cavity and the plunger connecting rod 504, facilitating the installation of the plunger mechanism. The bearing mating portion 403 needs to be machined to prevent relative deflection between the plunger connecting rod 504 and the camshaft 6 when the third bearing 503 slides along its inner wall.

[0032] Combination Figure 1 and Figure 2 As shown, the housing 2 is provided with a cover plate 3, which has an oil hole. A housing sealing ring is provided between the cover plate 3 and the housing 2. In this embodiment, a first sealing ring 7 and a sealing flange are provided between the guide mechanism 4 and the housing 2 to form a fully enclosed structure, avoiding gaps between the power rod and the guide structure, and between the guide mechanism 4 and the housing 2. The housing sealing ring and the cover plate 3 cooperate to avoid gaps between the cover plate 3 and the housing 2. Keeping the multi-plunger power mechanism in a fully enclosed state for a long period of time can prevent external debris from entering the housing 2 and prevent corrosive liquids that may appear in the working environment of the multi-plunger power mechanism from damaging it. This ensures the long-term stable use of the multi-plunger power mechanism; adding lubricating oil through the oil hole avoids the need to remove the cover plate 3 and the housing 2 for lubrication of the multi-plunger power mechanism.

[0033] Example 2

[0034] Unlike Example 1, in combination Figure 8 and Figure 9As shown, in this embodiment, a lubrication mechanism 8 is provided inside the plunger connecting rod 504. The lubrication mechanism includes a plunger oil passage 801 and a bearing horizontal oil passage 802. The plunger oil passage 801 and the bearing horizontal oil passage 802 connect the first bearing, the second bearing, and the third bearing, so that the lubricating medium can reach each contact surface of the plunger mechanism 5, and the plunger mechanism 5 is fully lubricated. The lubrication mechanism 8 also includes a bearing vertical oil passage 803. The connection between the bearing vertical oil passage 803 and the bearing horizontal oil passage is provided with an inclination angle. The inclination angle of the first bearing 501 is conducive to some of the lubricating medium passing over the bearing vertical oil passage 803 of the first bearing 501, and then lubricating the second bearing 502 and the third bearing 503. The inclination angle of the second bearing 502 is conducive to some of the lubricating medium passing over the vertical oil passage 803 of the second bearing 502, and then lubricating the third bearing 503. The end of the vertical oil passage 803 of the bearing away from the plunger connecting rod 504 is an oil passage extending in the same direction as the plunger connecting rod 504. The vertical oil passage 803 of the first bearing 501 can prevent the lubricating medium from impacting the camshaft 6. The vertical oil passages 803 of the second bearing 502 and the third bearing 503 can directly supply oil to the first working surface 601 and the second working surface 602, thereby improving the lubrication efficiency of the camshaft 6 cam.

[0035] This invention addresses the risks of spring structures failing to rebound promptly in complex environments, leading to fatigue and breakage. The plunger connecting rod 504's return stroke utilizes a cam curve for direct pull-back, achieving higher precision. The cam curve enables pulsation-free infusion and aspiration via the plunger connecting rod 504. The multi-plunger power mechanism employs a fully enclosed structure for long-term stable operation. This invention achieves ultra-long-term stable reciprocating motion of the multi-plunger connecting rod 504, providing high-precision aspiration and delivery. The multi-plunger power mechanism achieves pulsation-free and accurate delivery, and offers the following advantages: the first bearing 501 and the second bearing 502 closely adhere to the camshaft 6 from both sides, avoiding… The plunger-free connecting rod 504 does not deflect or move during reciprocating switching; a third bearing 503 is used in conjunction with the guide mechanism 4 to prevent the camshaft 6 from deflecting under the action of the plunger mechanism 5 reciprocating motion; the guide cavity is divided into a plunger mounting part 402 and a bearing mating part 403, which reduces the area of ​​the guide cavity that needs to be precision machined, which is beneficial to reducing processing costs. At the same time, it is beneficial to control the processing requirements of each position of the guide cavity. The plunger mounting part 402 needs to be machined to the installation and fitting accuracy between the guide cavity and the plunger connecting rod 504. The bearing mating part 403 needs to be machined to the point that when the third bearing 503 slides along the inner wall of the bearing mating part 403, the plunger connecting rod 504 and the camshaft 6 avoid relative deflection.

[0036] The above embodiments and / or implementation methods are merely preferred embodiments and / or implementation methods for implementing the present utility model, and are not intended to limit the implementation methods of the present utility model in any way. Any person skilled in the art can make some modifications to other equivalent embodiments without departing from the scope of the technical means disclosed in the present utility model, but these should still be regarded as the same technology or embodiments as the present utility model.

Claims

1. A high-precision springless multi-plunger power mechanism comprising a power lever (1), a camshaft (6) and a plunger mechanism (5), characterized in that, The plunger mechanism (5) includes at least two parallel plunger connecting rods (504). The plunger mechanism (5) has plunger connecting rods (504) that cooperate with a camshaft (6). The camshaft (6) has a cam. The cam of the camshaft (6) has a first working surface (601). The first working surface (601) is the mating surface of the cam away from the power rod (1) and the plunger mechanism (5). Each plunger connecting rod (504) has at least three bearings on the side near the cam. The bearings include a first bearing (501). The first bearing (501) and the first working surface (601) are in close contact. The first working surface (601) and the axial direction of the camshaft (6) have an angle. The plunger connecting rod (504) is provided with a lubrication mechanism (8), which includes a plunger oil passage (801) and a bearing horizontal oil passage (802). The plunger oil passage (801) and the bearing horizontal oil passage (802) connect the first bearing (501), the second bearing (502) and the third bearing (503). The lubrication mechanism (8) also includes a bearing vertical oil passage (803), and the connection between the bearing vertical oil passage (803) and the bearing horizontal oil passage is provided with an inclination angle; the end of the bearing vertical oil passage (803) away from the plunger connecting rod (504) is an oil passage with the same extension direction as the plunger connecting rod (504).

2. A high precision springless multi-plunger power unit according to claim 1, characterized in that, The cam has a second working surface (602), which is the mating surface of the cam near the power rod (1) and the plunger mechanism (5). The second working surface (602) and the axial direction of the camshaft (6) have an angle. The bearing includes a second bearing (502), which is in close contact with the second working surface (602).

3. A high precision springless multi-plunger power unit according to claim 2, characterized in that, The multi-plunger power mechanism includes a guide mechanism (4) and a housing (2). The guide mechanism (4) is connected to the camshaft (6) and the plunger mechanism (5) on one side and to the power rod (1) on the other side. A first sealing ring (7) is provided between the housing (2) and the guide mechanism (4).

4. A high precision springless multi-plunger power unit according to claim 3, characterized in that, The guiding mechanism (4) includes a guide sleeve (401), which has at least two guide cavities. The guide cavities correspond to the plunger connecting rod (504) of the plunger mechanism (5). The bearing includes a third bearing (503), one end of which is disposed inside the guide cavity, and the other end of which can slide within the guide cavity.

5. A high precision springless multi-plunger power unit according to claim 3, wherein, The guide mechanism (4) has a camshaft mounting hole at its axial position. One end of the camshaft mounting hole is connected to the camshaft (6), and the other end is connected to the power rod (1).

6. A high precision spring-less multi-plunger power unit as claimed in claim 4, wherein, The guide sleeve (401) is provided with guide cavities evenly distributed around its circumference, and the guide cavities are connected to the cam mounting hole and the outer circle of the guide sleeve (401).

7. A high precision spring-less multi-plunger power unit as claimed in claim 4 wherein, The guide cavity includes a plunger mounting part (402) and a bearing mating part (403). The plunger mounting part (402) mates with the plunger connecting rod (504), and the bearing mating part (403) mates with the third bearing (503). The third bearing (503) slides along the inner wall of the bearing mating part (403).

8. A high precision spring-less multi-plunger power unit as claimed in claim 3, wherein, The housing (2) is provided with a cover plate (3), the cover plate (3) is provided with an oil hole, and a housing (2) sealing ring is provided between the cover plate (3) and the housing (2).

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