Plunger pump variable speed regulating device and plunger pump thereof

Abstract

The utility model relates to a plunger pump variable speed regulation device and a plunger pump thereof, which comprise a variable plunger, a piston is arranged at one end of the variable plunger, a plunger ring is arranged on one side of the piston, the piston is fixed on the variable plunger through a pin, the variable plunger is arranged on a rear cover and can slide along an inner cavity in the rear cover, and the plunger ring is arranged on the rear cover. One end of the deflector rod is arranged in the variable plunger; according to the plunger pump variable speed regulation device and the plunger pump thereof, the speed regulation loop used for achieving constant-speed variable quantity of the variable plunger is designed, the constant-speed variable quantity of the variable plunger is achieved in the variable quantity process of the plunger pump, and the problem that an original pump is poor in variable quantity precision in the working process is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of hydraulic plunger pump, concretely to a plunger pump variable speed regulating device and plunger pump thereof. BACKGROUND

[0002] In modern hydraulic transmission, plunger pump is one of the most widely used hydraulic power elements, which is to change the volume in the plunger cylinder to suck and discharge liquid by reciprocating movement of the plunger, and is a kind of volumetric hydraulic pump. The plunger pump converts mechanical energy (torque and speed) into hydraulic energy (flow and pressure). Generally, the plunger pump is divided into constant-displacement plunger pump and variable-displacement plunger pump.

[0003] However, the existing variable-displacement plunger pump has the problems of fast variable response speed, mechanical imbalance of pump variable mechanism, variable mechanism jamming, unstable pump working state and poor variable precision. Therefore, there is an urgent need for a plunger pump variable speed regulating device and plunger pump to solve the above problems. SUMMARY

[0004] To achieve the above purpose, the utility model provides the following technical scheme: a plunger pump variable speed regulating device and plunger pump, comprising a variable plunger, one end of the variable plunger is provided with a piston, one side of the piston is provided with a plunger ring, the piston is fixed on the variable plunger by a second pin, the variable plunger is arranged on a rear cover, and the variable plunger can slide along the inner cavity in the rear cover, one end of a lever is arranged in the variable plunger, the other end of the lever is connected to a flow distribution disc, the lever is fixed on the variable plunger by a first pin, and the lever moves relatively with the variable plunger; one end of the flow distribution disc is in contact with the cylinder body, and the flow distribution disc slides along the track in the variable plunger along with the lever.

[0005] The limiting screw is arranged in the shell, is fixed in the shell by a locking nut and is sealed, the length of the limiting screw extending into the shell is adjusted to realize different displacement and different speed conversion; the valve sleeve is arranged on the rear cover, a valve core is arranged on the valve sleeve, a spring is arranged on the valve core, and a limiting screw plug is arranged on the upper end of the spring;

[0006] The limiting screw plug, spring, valve core and valve sleeve jointly constitute a pressure reducing valve part IV; a screw plug is arranged on one side of the valve core, a throttling plug is arranged on the left side of the screw plug, a valve body is arranged on the rear cover, a throttling pin is arranged on the valve body, and a valve seat is arranged on the throttling pin; the valve seat, throttling pin and valve body jointly constitute a throttling valve part V; the pressure reducing valve part IV, throttling valve part V and corresponding oil circuit jointly constitute a speed regulating valve part VI.

[0007] Preferably, when the working oil liquid enters the plunger pump control valve component I from the A working port, the working oil liquid passes through the first oil port, the control valve component I is in the right position, at this time, the working oil liquid passes through the control valve component I to the ninth oil port, the fifteenth oil port, the eighth oil port and the sixth oil port, so that the oil liquid acts on the hole 1 of the valve sleeve of the pressure reducing valve component IV to generate a pressure P1, passes through the hole 1 and the hole 2 of the valve core to the hole 2 of the valve sleeve 14, reaches the fifth oil path and the seventh oil path, passes through the twelfth oil path, the eleventh oil path and the tenth oil path of the cover plate component II, so that the oil liquid acts on the rodless cavity of the variable plunger to generate a pressure P2.

[0008] Preferably, the oil liquid acts on the rodless cavity of the variable plunger, passes through the second oil path to act on the upper oil path of the throttle valve component V, passes through the throttle valve component V to reach the third oil path and the fourth oil path, acts on the spring cavity of the pressure reducing valve component IV to generate a pressure P3, when P3 changes, P2 also changes, so that the valve core of the pressure reducing valve component IV keeps balance under the joint action of the force of P2 acting on the end face of the valve core, the spring force and the force of P3 acting on the end face of the valve core, the pressure difference P2-P3 between the two ends of the throttle valve component V always remains unchanged during normal operation, when P3 increases, the pressure acting on the upper end of the pressure reducing valve component IV increases, the valve core moves downward, the hole 1 of the valve sleeve, that is, the pressure reducing port, decreases, so that P2 increases, thereby the pressure difference P2-P3 between the two ends of the throttle valve component V always remains unchanged during normal operation, when P3 decreases, the pressure acting on the upper end of the pressure reducing valve component IV decreases, the valve core moves upward, the hole 1 of the valve sleeve, that is, the pressure reducing port, increases, so that P2 decreases, thereby the pressure difference P2-P3 between the two ends of the throttle valve component V always remains unchanged during normal operation.

[0009] Preferably, the pressure reducing valve component IV is an equidifference pressure reducing valve, which guarantees the constant pressure difference before and after the throttle of the throttle valve component V.

[0010] Preferably, the throttle valve component V is an outlet throttle, and the throttle valve component V and the pressure reducing valve component IV jointly form a speed regulating valve component VI, which guarantees the constant rotating speed of the variable plunger during the variable process.

[0011] Compared with the prior art, the plunger pump variable speed regulating device and the plunger pump have the beneficial effects that: on the basis of the original variable mode of the plunger pump, the original variable structure is improved, a speed regulating circuit for realizing uniform speed variable of the variable plunger is designed, the plunger pump realizes the uniform speed variable of the variable plunger during the variable process, and the problem of poor variable precision of the original pump during operation is solved. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a whole structure schematic view of the plunger pump variable speed regulating device and the plunger pump.

[0013] Figure 2 It is a whole structure schematic view of the pressure reducing valve component.

[0014] Figure 3 It is the whole structure schematic view of the speed regulating valve part of the utility model;

[0015] Figure 4 It is the distribution structure schematic view of the oil port of the utility model;

[0016] Figure 5 It is the distribution structure schematic view of the oil port of the utility model;

[0017] Figure 6 It is the structure schematic view of A working port and B working port of the utility model;

[0018] Figure 7 It is the structure schematic view of hole 1 and hole 2 of the utility model;

[0019] Figure 8 It is the installation structure schematic view of hole 1 and hole 2 of the utility model;

[0020] In the drawing mark: variable plunger 1;Plunger ring 2;Rear cover 3;Dial lever 4;First pin 5, piston 6;Flow distribution disc 7;Cylinder body 8;Second pin 9;Limiting screw 10;Limiting screw plug 11;Spring 12;Valve core 13;Valve sleeve 14;Screw plug 15;Throttling plug 16;Lock nut 17;Shell 18;Valve seat 19;Throttling pin 20;Valve body 21;Control valve part I;Cover plate part II;Rear cover part III, pressure reducing valve part IV;Throttle valve part V;Speed regulating valve part VI. Specific implementation

[0021] The technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0022] Please refer to Figures 1-8 The utility model provides a kind of technical scheme: a variable plunger pump variable speed regulating device and its variable plunger pump, including variable plunger 1, one end of the variable plunger 1 is provided with piston 6, one side of piston 6 is provided with plunger ring 2, the piston 6 is fixed on variable plunger 1 by second pin 9, variable plunger 1 is set on rear cover 3, and the variable plunger 1 can slide in rear cover 3 along inner cavity, dial lever 4 one end is set in variable plunger 1, dial lever 4 other end is connected flow distribution disc 7, dial lever 4 is fixed on variable plunger 1 by first pin 5, dial lever 4 moves relatively with variable plunger 1;The flow distribution disc 7 one end and cylinder body 8 face contact, and slide along racetrack in variable plunger 1 with dial lever 4;

[0023] The limiting screw 10 is arranged in the shell 18 and is fixed to the shell 18 by the locking nut 17 and is sealed, and different displacement and speed conversion is realized by adjusting the length of the limiting screw 10 extending into the shell; the valve sleeve 14 is arranged in the rear cover 3, the valve core 13 is arranged on the valve sleeve 14, the spring 12 is arranged on the valve core 13, and the limiting screw plug 11 is arranged on the upper end of the spring 12;

[0024] The limiting screw plug 11, the spring 12, the valve core 13 and the valve sleeve 14 jointly constitute a pressure reducing valve component IV; the valve core 13 is arranged on one side of the valve sleeve 14, the screw plug 15 is arranged on one side of the valve core 13, the throttling plug 16 is arranged on the left side of the screw plug 15, the valve body 21 is arranged on the rear cover 3, the throttling pin 20 is arranged on the valve body 21, and the valve seat 19 is arranged on the throttling pin 20; the valve seat 19, the throttling pin 20 and the valve body 21 jointly constitute a throttling valve component V; the pressure reducing valve component IV, the throttling valve component V and the corresponding oil path jointly constitute a speed regulating valve component VI.

[0025] When the working oil enters the plunger pump control valve component I through the A working port, the working oil passes through the first oil port, the control valve component I is in the right position, at this time, the working oil passes through the control valve component I to the ninth oil port, the fifteenth oil port, the eighth oil port and the sixth oil port, so that the oil acts on the hole 1 of the valve sleeve 14 of the pressure reducing valve component IV to generate a pressure P1, passes through the hole 1 and the hole 2 of the valve core 13 to the hole 2 of the valve sleeve 14, and reaches the fifth oil path and the seventh oil path, passes through the twelfth oil path, the eleventh oil path and the tenth oil path of the cover plate component II, so that the oil acts on the rodless cavity of the variable plunger 1 to generate a pressure P2.

[0026] The oil acting on the rodless cavity of the variable plunger 1 passes through the second oil path to act on the upper oil path of the throttling valve component V, passes through the throttling valve component V to reach the third oil path and the fourth oil path, and acts on the spring cavity of the pressure reducing valve component IV to generate a pressure P3.

[0027] The pressure reducing valve component IV is an equal-difference pressure reducing valve, which ensures the constant pressure difference before and after throttling of the throttling valve component V.

[0028] When P3 changes, P2 also changes, so that the valve core 13 of the pressure reducing valve component IV keeps balance under the joint action of the force acting on the end face of the valve core under the action of P2, the spring force and the force acting on the end face of the valve core under the action of P3, and the pressure difference P2-P3 at both ends of the throttling valve component V remains unchanged during normal operation.

[0029] When P3 increases, the pressure acting on the upper end of the pressure reducing valve component IV increases, the valve core 13 moves downward, the hole 1 of the valve sleeve 14, i.e. the pressure reducing port, decreases, so that P2 increases, thereby the pressure difference P2-P3 at both ends of the throttling valve component V remains unchanged during normal operation.

[0030] Wherein, when P3 decreases, the pressure acting on the upper end of the pressure reducing valve component IV decreases, the valve core 13 moves up, the hole 1 of the valve sleeve 14, i.e. the pressure reducing port, becomes larger, so that P2 decreases, thereby keeping the pressure difference P2-P3 of the throttling valve component V constant during normal operation.

[0031] Wherein, the throttling valve component V is an outlet throttle, which, together with the pressure reducing valve component IV, forms a speed regulating valve component VI, thereby ensuring that the variable plunger 1 maintains constant rotational speed during variable operation.

[0032] It should be noted that the variable speed regulating device for plunger pump and the plunger pump thereof according to the present application include a variable plunger 1, wherein one end of the variable plunger 1 is provided with a piston 6, the piston 6 is fixed to the variable plunger 1 by a second pin 9, the variable plunger 1 is arranged in a rear cover 3, and the variable plunger 1 can slide along an inner cavity in the rear cover 3.

[0033] In the embodiment, one end of the shifting lever 4 is arranged in the variable plunger 1, the other end of the shifting lever 4 is connected to a distribution disc 7, the shifting lever 4 is fixed to the variable plunger 1 by a first pin 5, and the shifting lever 4 moves relatively with the variable plunger 1.

[0034] In the embodiment, one end of the distribution disc 7 is in contact with the cylinder body 8 and slides along a racetrack in the variable plunger 1 along with the shifting lever 4.

[0035] In the embodiment, when the working oil enters both the upper and lower cavities of the piston 6, i.e. the rod cavity and the rodless cavity, have pressure, due to the different areas of the upper and lower ends of the piston 6, the variable plunger 1 moves upward, the distribution disc 7 and the cylinder body 8 are moved and the angle is reduced by the shifting lever 4, and the high-speed function is realized.

[0036] In the embodiment, the limiting screw 10 is arranged in the shell 18 and is fixed to the shell 18 by a locking nut 17 and is sealed, the length of the limiting screw 10 extending into the shell is adjusted, and different displacement and rotational speed conversion is realized.

[0037] In the embodiment, the valve sleeve 14 is arranged in the rear cover 3, the valve sleeve 14 is provided with a valve core 13, the valve core 13 is provided with a spring 12, and the upper end of the spring 12 is provided with a limiting screw plug 11.

[0038] In the embodiment, the limiting screw plug 11, the spring 12, the valve core 13 and the valve sleeve 14 jointly form a pressure reducing valve component IV.

[0039] In the embodiment, the valve body 21 is arranged in the rear cover 3, the valve body 21 is provided with a throttling pin 20, and the throttling pin 20 is provided with a valve seat 19.

[0040] In the embodiment, the valve seat 19, the throttling pin 20 and the valve body 21 jointly form a throttling valve component V.

[0041] In the embodiment, the pressure reducing valve component IV, the throttling valve component V and the corresponding oil circuit jointly form a speed regulating valve component VI.

[0042] In the embodiment, initially, the working oil enters the plunger pump control valve component I from the A working port, and the working oil passes through the first oil port. The control valve component I is in the left position. The working oil reaches the rod cavity of the variable plunger 1. When the working oil enters the upper cavity of the piston 6, i.e., the rod cavity, and the lower cavity, i.e., the non-rod cavity, has no pressure. Due to the different areas of the upper and lower ends of the piston 6, the variable plunger 1 moves downward. The flow distribution disc 7 and the cylinder body 8 are moved and the angle is increased by the shift rod 4, thereby realizing the low-speed function.

[0043] In the embodiment, when the working oil enters the plunger pump control valve component I from the A working port, the working oil passes through the first oil port. The control valve component I is in the right position. At this time, the working oil reaches the ninth oil port, the fifteenth oil port, the eighth oil port and the sixth oil port through the control valve component I, so that the oil acts on the hole 1 of the valve sleeve 14 of the pressure reducing valve component IV to generate a pressure P1. The oil passes through the hole 1 and the hole 2 of the valve core 13 to the hole 2 of the valve sleeve 14 to reach the fifth oil path and the seventh oil path, and passes through the twelfth oil path, the eleventh oil path and the tenth oil path of the cover plate component II, so that the oil acts on the non-rod cavity of the variable plunger 1 to generate a pressure P2.

[0044] In the embodiment, the oil acts on the non-rod cavity of the variable plunger 1, passes through the second oil path to the upper oil path of the throttle valve component V, and reaches the third oil path and the fourth oil path through the throttle valve component V to act on the spring cavity of the pressure reducing valve component IV to generate a pressure P3.

[0045] In the embodiment, the pressure reducing valve component IV is an equidifference pressure reducing valve, which ensures the constant pressure difference before and after the throttle valve component V throttles.

[0046] In the embodiment, when P3 changes, P2 will also change, so that the valve core 13 of the pressure reducing valve component IV keeps balance under the joint action of the force acting on the end face of the valve core by P2, the spring force and the force acting on the end face of the valve core by P3. The spring displacement is very small, and the spring force can be considered as a constant value. Therefore, the pressure difference P2-P3 at both ends of the throttle valve component V always remains unchanged during normal operation.

[0047] In the embodiment, when P3 increases, the pressure acting on the upper end of the pressure reducing valve component IV increases, the valve core 13 moves downward, the hole 1, i.e., the pressure reducing port, of the valve sleeve 14 decreases, so that P2 increases, thereby making the pressure difference P2-P3 at both ends of the throttle valve component V always remain unchanged during normal operation.

[0048] In the embodiment, when P3 decreases, the pressure acting on the upper end of the pressure reducing valve component IV decreases, the valve core 13 moves upward, the hole 1, i.e., the pressure reducing port, of the valve sleeve 14 increases, so that P2 decreases, thereby making the pressure difference P2-P3 at both ends of the throttle valve component V always remain unchanged during normal operation.

[0049] In the embodiment, the throttle component V is an outlet throttle, which, together with the pressure reducing valve component IV, forms a speed regulating valve component VI, which ensures that the variable plunger 1 maintains constant rotational speed during the variable process;

[0050] The basic principle and main features of the present application and the advantages of the present application are shown and described above. For those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and the present application can be realized in other specific forms without departing from the spirit or basic characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0051] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A variable speed device of a plunger pump and the plunger pump thereof comprising a variable plunger (1), characterized in that: One end of the variable plunger (1) is provided with a piston (6), one side of the piston (6) is provided with a plunger ring (2), the piston (6) is fixed on the variable plunger (1) by a second pin (9), the variable plunger (1) is arranged on the rear cover (3), and the variable plunger (1) can slide in the inner cavity of the rear cover (3), one end of the lever (4) is arranged in the variable plunger (1), the other end of the lever (4) is connected with the distribution disc (7), the lever (4) is fixed on the variable plunger (1) by a first pin (5), and the lever (4) moves relatively with the variable plunger (1); one end of the distribution disc (7) is in surface contact with the cylinder body (8) and slides along the track in the variable plunger (1) along with the lever (4); The limiting screw (10) is arranged in the shell (18), is fixed in the shell (18) and is sealed by the locking nut (17), different displacement and different speed conversion is realized by adjusting the length of the limiting screw (10) extending into the shell; the valve sleeve (14) is arranged in the rear cover (3), the valve sleeve (14) is provided with the valve core (13), the valve core (13) is provided with the spring (12), and the upper end of the spring (12) is provided with the limiting screw plug (11); The limiting screw plug (11), the spring (12), the valve core (13) and the valve sleeve (14) jointly constitute a pressure reducing valve component IV; one side of the valve core (13) is provided with the screw plug (15), the left side of the screw plug (15) is provided with the throttling plug (16), the valve body (21) is arranged in the rear cover (3), the valve body (21) is provided with the throttling pin (20), and the throttling pin (20) is provided with the valve seat (19); the valve seat (19), the throttling pin (20) and the valve body (21) jointly constitute a throttling valve component V; the pressure reducing valve component IV, the throttling valve component V and the corresponding oil circuit jointly constitute a speed regulating valve component VI.

2. A variable speed device for a plunger pump according to claim 1, and a plunger pump thereof, characterized in that: When the working oil enters the plunger pump control valve component I through the A working port, the working oil passes through the first oil port, and the control valve component I is in the right position. At this time, the working oil passes through the control valve component I to the ninth oil port, the fifteenth oil port, the eighth oil port, and the sixth oil port, so that the oil acts on the hole 1 of the valve sleeve (14) of the pressure reducing valve component IV to generate a pressure P1, passes through the hole 1 and the hole 2 of the valve core (13) to the hole 2 of the valve sleeve (14), reaches the fifth oil path and the seventh oil path, passes through the twelfth oil path, the eleventh oil path, and the tenth oil path of the cover plate component II, so that the oil acts on the rodless cavity of the variable plunger (1) to generate a pressure P2. The oil acts on the rodless cavity of the variable plunger (1), passes through the second oil path to the upper oil path of the throttle valve component V, passes through the throttle valve component V to reach the third oil path and the fourth oil path, and acts on the spring cavity of the pressure reducing valve component IV to generate a pressure P3. When P3 changes, P2 also changes, so that the valve core (13) of the pressure reducing valve component IV keeps balance under the joint action of the force of P2 acting on the end face of the valve core, the spring force, and the force of P3 acting on the end face of the valve core. The pressure difference P2-P3 between the two ends of the throttle valve component V remains unchanged during normal operation. When P3 increases, the pressure acting on the upper end of the pressure reducing valve component IV increases, the valve core (13) moves downward, the hole 1 of the valve sleeve (14), i.e., the pressure reducing port, decreases, so that P2 increases, thereby keeping the pressure difference P2-P3 between the two ends of the throttle valve component V unchanged during normal operation. When P3 decreases, the pressure acting on the upper end of the pressure reducing valve component IV decreases, the valve core (13) moves upward, the hole 1 of the valve sleeve (14), i.e., the pressure reducing port, increases, so that P2 decreases, thereby keeping the pressure difference P2-P3 between the two ends of the throttle valve component V unchanged during normal operation.

3. A variable speed device for a plunger pump and plunger pump thereof according to claim 1, characterized in that: The pressure reducing valve component IV is an equidifference pressure reducing valve, which ensures the constant pressure difference before and after the throttle valve component V.

4. The variable speed device of claim 1, wherein: The throttle valve component V is an outlet throttle valve, and the speed regulating valve component VI composed of the throttle valve component V and the pressure reducing valve component IV ensures that the variable plunger (1) maintains a constant rotational speed during the variable process.

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