CN103615388A - Rotary core type circumferential flow distribution device for reciprocating plunger pump - Google Patents

Abstract

The invention belongs to the technical field of hydraulic power transfer and output equipment, and relates to a rotary core type circumferential flow distribution device for a reciprocating plunger pump. A plunger is fixedly mounted in a cavity of a pump body; a slide sleeve is mounted in the pump body; an air hole is formed in the inner cavity of the plunger; a radial small hole is formed in the inner side wall of the plunger; a pressure spring and a driven pin are arranged on the radial small hole; a valve core is mounted below the slide sleeve; the outer surface of the valve core is the circumferential wall of the valve core; a circular cavity formed between the central shaft of the valve core and the circumferential wall of the valve core and the lower end surface of the plunger form a pump cavity; a valve core hole is formed in the lower end surface of the valve core; a cam groove is formed on the central shaft of the valve core; a flow distribution hole is formed in the circumferential wall of the valve core; a liquid inlet is formed on the right of the circumferential wall of the valve core, and a liquid outlet is formed on the left; the valve core, the cam groove on the outer circle surface of the central shaft of the valve core, the driven pin and the plunger form a deformation translation cylindrical guide groove cam mechanism. The device provided by the invention has the advantages of compact structure, high volume efficiency, stable performance, low pressure loss, good energy saving effect, wide application range and broad industrialization prospect.

Description

A rotary core type circumferential flow distribution device for a reciprocating plunger pump

Technical field:

The invention belongs to the technical field of hydraulic power transmission and output equipment, and relates to a rotary core type circumferential flow distribution device for a reciprocating plunger pump.

Background technique:

The pump industry consumes about 20% of electric energy, and it is the second largest electromechanical industry after automobiles in the world. Among them, reciprocating plunger pumps are widely used in fluid engines, crude oil transportation, gas stations, pump stations, mobile machinery and fixed machinery . At present, the most serious problem of the reciprocating plunger pump is that the structure of the distribution system is loose and large, the efficiency is low, and the performance is unstable. The existing distribution structure has two types: disc distribution and valve distribution. On inclined-axis hydraulic motors or hydraulic pumps, disc-type flow distribution is not used on reciprocating plunger pumps. Disk-type flow distribution uses the relative rotation between the swash plate and the plunger to adjust the opening and closing of the inlet and outlet fluid ports. This flow distribution method Leakage will occur due to the wear of the swash plate during work, resulting in a decrease in volumetric efficiency; reciprocating plunger pumps, gear pumps, etc. mainly use valve-type flow distribution, and valve-type flow distribution mainly includes one-way valve flow distribution and on-off valve flow distribution. This flow distribution method has many disadvantages: one is that the check valve and switch valve are bulky and need to be connected by pipe joints, the size of the pipe joint is also large, and it is easy to leak; the other is that the check valve and switch valve have small diameters and have Partial throttling effect, large pressure loss; third, the structure of the distribution system is scattered, fixed installation and inconvenient, increasing the difficulty of its layout on the loading object; fourth, a hydraulic pump and multiple hydraulic valves together adjust and control the fluid quality of the entire hydraulic system The flow state of the hydraulic system, especially the hydraulic valve as the control element of the hydraulic system, due to the complex structure and high precision requirements, resulting in high manufacturing costs and expensive prices; single pump and multiple valves prolong the movement route of the fluid, resulting in pressure loss, pumps and valves Although it is a high-precision component, there are also errors. The flow distribution link of a single pump and multiple valves increases the number of components in the entire flow distribution structure and increases the cumulative error. Fifth, the volumetric efficiency of the valve is greatly affected by the operating frequency of the pump. Once it deviates from In the calibration working condition, the volumetric efficiency is greatly reduced. Therefore, it is of great significance to seek a rotary core circumferential flow distribution device for a reciprocating plunger pump with a compact structure and high volumetric efficiency.

Invention content:

The purpose of the present invention is mainly to overcome the shortcomings of low volume efficiency, large pressure loss, large volume and high cost of the traditional flow distribution system for reciprocating plunger pumps, and to seek a low cost, compact structure, small pressure loss, high volume efficiency and stable performance. The reciprocating plunger pump uses a rotary core type circumferential flow distribution device to realize the conversion and output of mechanical energy to hydraulic energy.

In order to achieve the purpose of the above invention, the present invention makes full use of the reciprocating motion of the plunger, cleverly utilizes the modified straight-acting cylindrical guide groove cam mechanism to convert the reciprocating linear motion of the plunger into the continuous one-way rotary motion of the valve core, and then utilizes the continuous unidirectional rotation of the valve core. The unidirectional rotary motion realizes that when the plunger moves upward, the pump chamber communicates with the fluid inlet on the surrounding surface to inhale fluid, and when the plunger descends, the pump chamber communicates with the fluid outlet on the surrounding surface to extrude fluid, completing the process of fluid transportation and pumping fluid.

The main structure of the present invention includes a pump body, a fluid inlet, a compression spring, a driven pin, a sliding sleeve, a plunger, a valve core, a fluid outlet and a pump chamber, wherein the valve core includes a valve core axis, a valve core peripheral wall, a cam groove, Spool hole and distribution hole; the shape of the pump body that supports and connects is designed according to the use environment and equipment requirements of the pump body; the plunger of hollow cylindrical structure is fixed in the cavity of the pump body, wear-resistant or self- The sliding sleeve made of lubricating material is embedded in the pump body and guides the plunger; the sliding sleeve and the plunger fit closely, and the plunger reciprocates axially in the sliding sleeve under the action of external force; the circle of the plunger There is an air hole communicating with the outside atmosphere on the shaped inner cavity. When the plunger goes up, the outside atmosphere enters the circular inner cavity through the air hole, and when the plunger goes down, the gas in the circular inner cavity is discharged through the air hole; the inner wall of the plunger is formed with Radial small hole, the radial small hole is equipped with a compression spring and a driven pin, the compression spring is sleeved on the driven pin, the compression spring is a coil spring, the driven pin is a cylindrical pin, and the driven pin and the radial small hole are clearance matched , when the driven pin moves up and down with the plunger, the driven pin is pressed against the cam groove of the valve core under the action of the compression spring; the valve core is installed under the sliding sleeve, and the valve core is in the cavity of the pump body Cooperate with the clearance of the inner wall of the pump, when the spool moves axially, it is limited and constrained by the lower end surface of the sliding sleeve, and can only rotate around the axis; The inner cavity is clearance fit; the outside of the valve core is the surrounding wall of the valve core, the circular cavity formed between the central axis of the valve core and the surrounding wall of the valve core and the lower end surface of the plunger form a pump chamber, and the pump chamber becomes larger or larger when the plunger moves up and down. It becomes smaller, corresponding to the process of sucking in or pumping out the fluid; the lower end of the spool has a spool hole that connects the bottom of the spool with the pump chamber, and the spool hole guides the fluid to the bottom of the spool to contact the friction surface of the pump body. It plays the role of cooling and lubrication; the central axis of the valve core is provided with a cam groove, and the cam groove rotates 360 degrees around the central axis of the valve core to close, so as to realize the one-way continuous rotation of the valve core. When the follower pin goes up, the depth of the corresponding semicircular cam groove on the center shaft of the spool gradually becomes shallower from the bottom to the top, and suddenly becomes deeper when it reaches the top. At this time, the follower pin is pressed against the cam groove under the action of the compression spring. The depth cannot repeat the cam groove line that the first half circle traveled when the plunger reverses direction; when the plunger moves down with the follower pin, the cam groove corresponding to the other half circle on the central axis of the spool gradually becomes shallower from the top to the bottom , When it reaches the bottom, it suddenly becomes deeper. At this time, the driven pin is pressed against the depth of the cam groove under the action of the compression spring, and it cannot repeat the cam groove line that the plunger passed in the first half cycle when the plunger is reversing; such a cycle continues to realize the valve core. With the reciprocating movement of the plunger, it rotates continuously in one direction; the peripheral wall of the valve core is provided with a distribution hole, and the width of the distribution hole in the circumferential direction cannot make the fluid inlet and fluid outlet communicate, otherwise the fluid cannot be transported and pumped; the distribution hole is axial The length of the valve core can reach from the lower edge of the annular cavity of the valve core to the upper edge of the surrounding wall at most, so that the flow area of the fluid entering and leaving the pump chamber is the largest, and the resistance of the fluid entering and leaving the pump chamber is the smallest, so that the volumetric efficiency of the entire flow distribution device is the highest; the valve The surrounding wall of the core is matched with the high-precision clearance of the pump body. The right side of the surrounding wall of the valve core is the fluid inlet, the left side is the fluid outlet, and the fluid inlet is The distance from the fluid outlet in the circumferential direction is greater than the circumferential width of the distribution hole; with the reciprocating movement of the plunger and the rotation of the valve core, the distribution hole communicates with the circumferential fluid inlet when the plunger moves upward, and the pump cavity becomes larger to suck fluid; When the plug descends, it communicates with the fluid outlet in the circumferential direction, and the pump cavity becomes smaller to press out the fluid, so as to realize the transportation and pressurization of the fluid; Direct-acting cylindrical guide groove cam mechanism, using this modified direct-acting cylindrical guide groove cam mechanism to convert the reciprocating linear motion of the plunger into continuous one-way rotary motion of the valve core, and then use the continuous one-way rotary motion of the valve core to realize the upward movement of the plunger When the pump cavity and the fluid inlet on the surrounding surface communicate with the suction fluid, when the plunger descends, the pump cavity and the fluid outlet on the surrounding surface communicate to press out the fluid, completing the fluid transport and pump fluid process.

When the reciprocating plunger pump works in the present invention, the external force drives the plunger to reciprocate, and the plunger drives the compression spring and the driven pin to reciprocate synchronously, and the driven pin is pressed against the cam groove under the action of the compression spring. , the follower pin moves the spool to turn right through the cam groove. At this time, the distribution hole communicates with the fluid inlet, and the fluid enters the pump chamber through the fluid inlet. As the depth of the cam groove gradually becomes shallower, the length of the follower pin in the cam groove becomes smaller. Small, the force of the compressed spring is getting bigger and bigger; when the plunger moves to the top dead center, the valve core rotates 180 degrees, and the follower pin reaches the upper end of the cam groove, at this time, the cam groove suddenly becomes deeper and there is a step, Under the action of the compression spring, the follower pin suddenly protrudes and presses against the depth of the cam groove. When the plunger goes down, the follower pin is stopped by the step of the cam groove, and cannot return to and repeat the half-circle cam groove that it just walked. The other half of the cam groove moves, pushing the valve core to rotate continuously in the same direction, the distribution hole is connected with the fluid outlet, and the fluid is pressed out by the plunger through the fluid outlet; when the plunger descends, the depth of the cam groove gradually becomes shallower, and the follower pin is in the cam groove The length of the valve becomes smaller, and the force of the compression spring becomes larger; when the plunger moves to the bottom dead center, the valve core continues to rotate 180 degrees, and the follower pin just reaches the lower end of the cam groove, and the cam groove suddenly becomes deeper There is a step, and the follower pin suddenly stretches out and presses against the depth of the cam groove under the action of the compression spring. When the plunger goes up again, the follower pin is blocked by the step of the cam groove, and cannot return to and repeat the half cycle just passed. The cam groove can only move along the other half of the cam groove, pushing the valve core to rotate continuously in the same direction, so that the cycle is continuous to realize fluid transport and pressure output.

Compared with the prior art, the present invention realizes the flow distribution function of the reciprocating plunger pump. The working medium can be various fluids such as oil, water and gas. impact, small pressure loss, good energy-saving effect, wide application and broad prospects for industrialization.

Description of drawings:

Fig. 1 is a schematic diagram of the principle of the main structure of the present invention.

Fig. 2 is a schematic diagram of a cross-sectional top view structure of the present invention.

Fig. 3 is a schematic diagram of the principle of the structure of the valve core involved in the present invention.

Detailed ways:

Further description will be given below through the embodiments and in conjunction with the accompanying drawings.

Example:

The main structure of the present embodiment is a pump body 1, a fluid inlet 2, a compression spring 3, a driven pin 4, a sliding sleeve 5, a plunger 6, a valve core 7, a fluid outlet 8 and a pump chamber 9, wherein the valve core 7 includes a valve core Center shaft 10, spool peripheral wall 11, cam groove 12, spool hole 13 and distribution hole 14; the shape of the pump body 1, which plays a supporting and connecting role, is designed according to the environment and equipment requirements of the pump body 1; the hollow cylindrical structure The plunger 6 is fixedly installed in the cavity of the pump body 1, and the sliding sleeve 5 made of wear-resistant or self-lubricating material is embedded in the pump body 1 to guide the plunger 6; the sliding sleeve 5 and the plunger 6 Close fit, the plunger 6 reciprocates in the axial direction in the sliding sleeve 5 under the action of external force; the circular inner cavity of the plunger 6 is provided with air holes communicating with the outside atmosphere, and the outside air passes through the air holes when the plunger 6 moves upward Entering the circular inner cavity, when the plunger 6 descends, the gas in the circular inner cavity is discharged through the air hole; the inner wall of the plunger 6 is formed with a radial small hole, and the radial small hole is equipped with a compression spring 3 and a driven pin 4, The compression spring 3 is sleeved on the driven pin 4, the compression spring 3 is a coil spring, the driven pin 4 is a cylindrical pin, and the driven pin 4 is matched with the radial small hole, as shown in Figure 1, the radial small hole and the driven pin The driven pin 4 overlaps, therefore, the small radial hole is not marked in Fig. 1; when the driven pin 4 reciprocates up and down with the plunger 6, the driven pin 4 is pressed against the cam of the valve core 7 under the action of the compression spring 3 In the groove; the spool 7 is installed under the sliding sleeve 5, the spool 7 fits with the inner wall of the pump body 1 in the cavity of the pump body 1, and the spool 7 is limited by the lower end surface of the sliding sleeve 5 when it is displaced in the axial direction. Constraint, can only rotate around the axis; the middle of the spool 7 is the spool central axis 10, and the spool central axis 10 and the circular inner cavity of the plunger 6 are in clearance fit; the outer surface of the spool 7 is the spool peripheral wall 11, the spool The annular cavity formed between the central axis 10 and the peripheral wall 11 of the valve core and the lower end surface of the plunger 6 form a pump chamber 9. When the plunger 6 moves up and down, the pump chamber 9 becomes larger or smaller, corresponding to the fluid intake or pump out. process; the lower end surface of the spool 7 is formed with a spool hole 13 that connects the bottom surface of the spool 7 with the pump chamber 9, and the spool hole 13 guides the fluid to the bottom surface of the spool 7 to contact the friction surface of the pump body 1, thereby cooling and Lubricating effect; the central shaft 10 of the valve core is formed with a cam groove 12, and the cam groove 12 is closed by turning 360 degrees around the central shaft 10 of the valve core to realize the one-way continuous rotation of the valve core 7. When the plug 6 goes up with the follower pin 4, the corresponding half-circumference cam groove 12 on the center shaft 10 of the valve core gradually becomes shallower from the bottom to the top, and suddenly becomes deeper when it reaches the top. At this time, the follower pin 4 is pressing the spring 3 is pressed against the depth of the cam groove 12 and cannot repeat the cam groove line that the plunger 6 traveled in the first half circle when the plunger 6 changes direction; The cam groove 12 of the half circle also gradually becomes shallow from the top to the bottom, and suddenly becomes deep when it reaches the bottom. At this time, the driven pin 4 is pressed against the depth of the cam groove 12 under the action of the compression spring 3 and cannot be pressed against the plunger 6. When reversing, repeat the cam groove line that was passed in the first half cycle; such a cycle continues to realize the unidirectional continuous rotation of the valve core 7 with the reciprocating movement of the plunger 6; The width in the circumferential direction of 14 cannot make the fluid inlet 2 communicate with the fluid outlet 8, otherwise the fluid cannot be transported and pumped; the axial length of the flow distribution hole 14 can reach the surrounding wall at most from the lower edge of the annular cavity of the spool 7 The upper edge of the upper edge of the pump chamber 9 makes the flow area of the fluid in and out of the pump chamber 9 the largest, and the resistance of the fluid in and out of the pump chamber 9 is the smallest, so that the volumetric efficiency of the entire flow distribution device is the highest; The right side is the fluid inlet 2, and the left side is the fluid outlet 8, and the distance between the fluid inlet 2 and the fluid outlet 8 in the circumferential direction is greater than the circumferential width of the distribution hole 13; as the plunger 6 reciprocates and the valve core 7 rotates, the distribution hole 13 communicates with the circumferential fluid inlet 2 when the plunger 6 ascends, and the pump chamber 9 becomes larger to suck in fluid; when the plunger 6 descends, the distribution hole 13 communicates with the circumferential fluid outlet 8, and the pump chamber 9 becomes smaller to press out the fluid , to realize fluid transportation and pressurization; the valve core 7, the cam groove 12 on the outer surface of the valve core axis 10, the driven pin 4 and the plunger 6 form a modified straight-acting cylindrical guide groove cam mechanism, and the direct-acting The cylindrical guide groove cam mechanism converts the reciprocating linear motion of the plunger 6 into the continuous one-way rotary motion of the valve core 7, and then utilizes the continuous one-way rotary motion of the valve core 7 to realize the fluid quality of the pump chamber 9 and its surrounding surface when the plunger 6 goes up. The inlet 2 communicates with the inhaled fluid, and when the plunger 6 descends, the pump chamber 9 communicates with the fluid outlet 8 on its surrounding surface to press out the fluid, completing the process of fluid transport and pump fluid.

In the present invention, when the reciprocating plunger 6 pump is working, the external force drives the plunger 6 to reciprocate, the plunger 6 drives the compression spring 3 and the driven pin 4 to reciprocate synchronously, and the driven pin 4 is pressed against the cam groove under the action of the compression spring 3 12, when the plunger 6 goes up, the follower pin 4 moves the valve core 7 to turn right through the cam groove 12 (rotate counterclockwise when viewed from above in Figure 1), at this time, the distribution hole is connected with the fluid inlet 2, and the fluid passes through the fluid The inlet 2 enters the pump chamber 9, because the depth of the cam groove 12 gradually becomes shallower, the length of the follower pin 4 in the cam groove 12 becomes smaller, and the force of the compression spring 3 becomes larger and larger; when the plunger 6 moves to the upper At the stop point, the valve core 7 rotates 180 degrees, and the driven pin 4 reaches the upper end of the cam groove 12. At this time, the cam groove 12 suddenly becomes deeper and there is a step, and the driven pin 4 suddenly stretches out and presses against it under the action of the compression spring 3. To the depth of the cam groove 12, when the plunger 6 descends, the driven pin 4 is blocked by the step of the cam groove 12, and cannot return to and repeat the half-circle cam groove just passed, but can only move along the other half-circle cam groove 12 to push the valve core 7 rotate continuously in the same direction, the distribution hole is connected with the fluid outlet 8, and the fluid passes through the fluid outlet 8 and is pressed out by the plunger 6; when the plunger 6 descends, the depth of the cam groove 12 gradually becomes shallower, and the follower pin 4 is in the cam groove 12. The length becomes smaller, and the force of the compression spring 3 becomes larger and larger; when the plunger 6 moves to the bottom dead center, the valve core 7 continues to rotate 180 degrees, and the driven pin 4 just reaches the lower end of the cam groove 12, and the cam The groove 12 suddenly becomes deeper and there is a step, and the driven pin 4 suddenly stretches out and presses against the depth of the cam groove 12 under the action of the compression spring 3. When the plunger 6 goes up again, the driven pin 4 is stopped by the step of the cam groove 12 , can’t return to and repeat the half-circle cam groove 12 just passed, and can only move along the other half-circle cam groove 12 to push the valve core 7 to rotate continuously in the same direction, so that the cycle is continuous to realize fluid transport and pressure output.

Claims (2)

1. A rotary core type circumferential flow distribution device for a reciprocating plunger pump, characterized in that the main structure includes a pump body, a fluid inlet, a compression spring, a driven pin, a sliding sleeve, a plunger, a spool, a fluid outlet and a pump chamber , wherein the spool includes the central axis of the spool, the peripheral wall of the spool, the cam groove, the spool hole and the distribution hole; the shape of the pump body that supports and connects is designed according to the operating environment and equipment requirements of the pump body; the hollow cylindrical structure The plunger is fixedly installed in the cavity of the pump body, and the sliding sleeve made of wear-resistant or self-lubricating material is embedded in the pump body to guide the plunger; the sliding sleeve and the plunger are closely fitted, and the plunger is in the Under the action of external force, it reciprocates in the axial direction in the sliding sleeve; the circular cavity of the plunger is provided with air holes communicating with the outside atmosphere. The gas in the inner cavity is discharged through the air hole; the inner wall of the plunger is made with radial holes, and the radial holes are equipped with compression springs and follower pins, and the compression springs are sleeved on the follower pins, and the compression springs are helical Spring, the driven pin is a cylindrical pin, and the driven pin is matched with the small radial hole. When the driven pin reciprocates up and down with the plunger, the driven pin is pressed against the cam groove of the valve core under the action of the compression spring; The spool is installed under the sliding sleeve, and the spool fits in the cavity of the pump body with a gap between the inner wall of the pump body. When the spool moves axially, it is limited and constrained by the lower end surface of the sliding sleeve, and can only rotate around the axis; the spool’s The center is the central axis of the spool, and the central axis of the spool fits with the circular inner cavity of the plunger; the outside of the spool is the surrounding wall of the spool, and the annular cavity and column formed between the central axis of the spool and the surrounding wall of the spool The lower end surface of the plug forms a pump cavity, and when the plunger moves up and down, the pump cavity becomes larger or smaller, corresponding to the process of sucking in or pumping out fluid; the lower end surface of the valve core is formed with a valve core hole that connects the bottom surface of the valve core and the pump cavity, The spool hole guides the fluid to the bottom surface of the spool to contact the friction surface of the pump body for cooling and lubrication; a cam groove is formed on the central axis of the spool, and the cam groove rotates 360 degrees around the central axis of the spool to close, realizing the single movement of the spool. The depth of the cam groove is different in each direction. When the plunger moves up with the follower pin, the corresponding semi-circular cam groove on the central axis of the spool gradually becomes shallower from the bottom to the top, and suddenly becomes deeper when it reaches the top. At this time, the driven pin is pressed against the depth of the cam groove under the action of the compression spring and cannot repeat the cam groove line that the plunger passed in the first half circle when the plunger reverses; The corresponding cam groove of the other half cycle gradually becomes shallow from the top to the bottom, and suddenly becomes deep when it reaches the bottom. At this time, the follower pin is pressed against the depth of the cam groove under the action of the compression spring and cannot be reversed when the plunger is reversing. Repeat the cam groove circuit in the first half cycle; such a continuous cycle realizes the one-way continuous rotation of the valve core with the reciprocating movement of the plunger; the peripheral wall of the valve core is formed with a distribution hole, and the width of the distribution hole in the circumferential direction limits the fluid inlet and fluid outlet. Unicom, to realize the transportation and pumping of fluid; the axial length of the distribution hole is from the lower edge of the valve core to the upper edge of the surrounding wall, so that the flow area of fluid entering and leaving the pump cavity is the largest, and the resistance of fluid entering and exiting the pump cavity is the largest. The minimum volumetric efficiency of the entire flow distribution device is achieved; the surrounding wall of the valve core is matched with the high-precision clearance of the pump body, and the right side of the surrounding wall of the valve core is the fluid inlet. The left side is the fluid outlet, and the distance between the fluid inlet and the fluid outlet in the circumferential direction is greater than the circumferential width of the distribution hole; with the reciprocating movement of the plunger and the rotation of the valve core, the distribution hole communicates with the circumferential fluid inlet when the plunger moves upward. The pump cavity becomes larger to inhale fluid; the distribution hole communicates with the circumferential fluid outlet when the plunger moves downward, and the pump cavity becomes smaller to press out the fluid to realize fluid transportation and pressurization; the valve core and the cam on the outer surface of the valve core axis The groove, driven pin and plunger form a modified straight-acting cylindrical guide groove cam mechanism, which converts the reciprocating linear motion of the plunger into continuous one-way rotary motion of the spool, and then uses the spool's The continuous unidirectional rotary motion realizes that when the plunger moves upward, the pump chamber communicates with the fluid inlet on the surrounding surface to inhale fluid, and when the plunger descends, the pump chamber communicates with the fluid outlet on the surrounding surface to extrude fluid, completing the process of fluid transportation and pumping fluid. 2. The rotary core type circumferential flow distribution device for a reciprocating plunger pump according to claim 1, characterized in that when the reciprocating plunger pump is working, the external force drives the plunger to reciprocate, and the plunger drives the compression spring and the driven pin synchronously Reciprocating movement, the driven pin is pressed against the cam groove under the action of the compression spring. When the plunger moves upward, the driven pin drives the valve core to turn rightward through the cam groove. At this time, the distribution hole is connected with the fluid inlet, and the fluid passes through the fluid. When the inlet enters the pump chamber, as the depth of the cam groove gradually becomes shallower, the length of the driven pin in the cam groove becomes smaller, and the force of the compression spring becomes larger and larger; when the plunger moves to the top dead center, the valve core rotates 180 degrees, the follower pin reaches the upper end of the cam groove. At this time, the cam groove suddenly becomes deeper and there is a step. The follower pin suddenly protrudes and presses against the depth of the cam groove under the action of the compression spring. Blocked by the step of the cam groove, it is impossible to return and repeat the half-circle cam groove just passed, and can only move along the other half-circle cam groove, pushing the valve core to rotate continuously in the same direction, the distribution hole is connected with the fluid outlet, and the fluid passes through the fluid outlet and is pumped by the column. The plug is pressed out; when the plunger goes down, because the depth of the cam groove gradually becomes shallower, the length of the follower pin in the cam groove becomes smaller, and the force of the compression spring becomes larger and larger; when the plunger moves to the bottom dead center, The spool continues to rotate 180 degrees, and the driven pin just reaches the lower end of the cam groove. At this time, the cam groove suddenly becomes deeper and there is a step. When the plug goes up again, the driven pin is blocked by the step of the cam groove, and cannot return to and repeat the half-circle of the cam groove just passed, but can only move along the other half-circle of the cam groove, pushing the valve core to rotate continuously in the same direction, so that the cycle is continuous to realize fluid delivery. transport and pressure output.

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