阅读说明：本技术 柱塞泵用的扭矩控制装置 (Torque control device for plunger pump ) 是由 李童 叶鹏飞 李玮斌 于 2021-08-20 设计创作，主要内容包括：本发明提供了一种柱塞泵用的扭矩控制装置,属于机械技术领域。它解决了扭矩控制不稳定的问题。本柱塞泵用的扭矩控制装置包括阀套、滑动设置于阀套内的控制杆以及作用在控制杆上的预加载机构,阀套侧部贯穿设置有输入油槽与输出油槽,控制杆与阀套之间形成有与输入油槽相连通的沟通槽,当控制杆克服预加载机构作用进行滑动时沟通槽能将输入油槽与输出油槽导通,位于沟通槽远离预加载机构一侧的控制杆侧部设有与输入油槽相连通的先导槽,先导槽两侧的控制杆之间具有当先导槽内进油时能使控制杆向预加载机构滑动的受力面积差,沟通槽两侧的控制杆沿轴向的受力面积相等。本扭矩控制装置具备扭矩控制稳定、使用寿命长等优点。(The invention provides a torque control device for a plunger pump, and belongs to the technical field of machinery. It has solved the unstable problem of torque control. This torque control device for plunger pump includes the valve barrel, slide and set up the control lever in the valve barrel and be used in the preloading mechanism on the control lever, the valve barrel lateral part runs through and is provided with input oil groove and output oil groove, be formed with the communication groove that is linked together with input oil groove between control lever and the valve barrel, the groove leads to the groove and can switch on input oil groove and output oil groove when the control lever overcomes preloading mechanism effect and slides, the control lever lateral part that is located and is kept away from preloading mechanism one side in the communication groove is equipped with the guide groove that is linked together with input oil groove, it can make the control lever to the gliding atress area difference of preloading mechanism when the interior oil feed of guide groove in the guide groove of guide has earlier between the control lever of guide groove both sides, the control lever that links up the groove both sides is equal along axial atress area. The torque control device has the advantages of stable torque control, long service life and the like.)

1. Torque control device for plunger pump, including valve barrel (2), slide and set up control lever (3) in valve barrel (2) and pre-load mechanism (4) of effect on control lever (3), valve barrel (2) lateral part run through and be provided with input oil groove (2a) and output oil groove (2b), be formed with ditch through groove (3f) that are linked together with input oil groove (2a) between control lever (3) and valve barrel (2), ditch through groove (3f) can switch on input oil groove (2a) and output oil groove (2b) when control lever (3) overcome pre-load mechanism (4) effect and slide, its characterized in that, the control lever (3) lateral part that is located ditch through groove (3f) and keeps away from pre-load mechanism (4) one side is equipped with first guide slot (3e) that are linked together with input oil groove (2a), it can make control lever (3) to lead to pre-load when the oil feed in guide slot (3e) earlier to have between control lever (3) of guide slot (3e) both sides The sliding stress area of the mechanism (4) is poor, and the stress areas of the control rods (3) at the two sides of the through groove (3f) along the axial direction are equal.

2. The torque control device for the plunger pump according to claim 1, wherein the pilot groove (3e) and the through groove (3f) are both annular grooves, the area of the groove wall of the pilot groove (3e) on one side close to the through groove (3f) is larger than that of the groove wall on the other side, and the areas of the groove walls on both sides of the through groove (3f) are equal.

3. The torque control device for the plunger pump according to claim 2, wherein the control rod (3) has a second engagement section (3a) and a third engagement section (3b), the first guide groove (3e) is provided between the second engagement section (3a) and the third engagement section (3b), and the cross-sectional area of the third engagement section (3b) is larger than that of the second engagement section (3 a).

4. The torque control device for the plunger pump according to claim 3, wherein the control rod (3) further has a first engaging section (3c), the through groove (3f) is provided between the first engaging section (3c) and a third engaging section (3b), and the cross-sectional area of the first engaging section (3c) is the same as that of the third engaging section (3 b).

5. The torque control device for a plunger pump according to claim 1, 2, 3 or 4, wherein the input oil groove (2a) includes a first hole portion (2a2) and a second hole portion (2a3), one port of the first hole portion (2a2) communicates with one port of the second hole portion (2a3), the other port of the first hole portion (2a2) communicates with the through groove (3f), and the other port of the second hole portion (2a3) communicates with the first guide groove (3 e).

6. The torque control device for the plunger pump according to claim 5, further comprising a valve body (1), wherein the valve housing (2) is disposed in the valve body (1), the side of the valve body (1) is provided with an input oil port (1a) in a penetrating manner, the input oil groove (2a) further comprises a groove portion (2a1) disposed on the outer wall of the valve housing (2) and communicated with the input oil port (1a), and the hole portion I (2a2) and the hole portion II (2a3) each have one end opening penetrating through the bottom wall of the groove portion (2a 1).

7. The torque control device for a plunger pump according to claim 6, wherein the groove portion (2a1) has a ring shape and the first hole portion (2a2) is parallel to the second hole portion (2a 3).

Technical Field

The invention belongs to the technical field of machinery, relates to a torque control device, and particularly relates to a torque control device for a plunger pump.

Background

Generally, a plunger pump used in engineering machinery is often used as a torque control device, and the output power of an engine can be effectively utilized as much as possible by controlling the engineering machinery through the torque, so that the purposes of energy conservation and emission reduction are achieved.

An axial plunger pump torque control device with application number CN201520830726.8 is invented in the market, which comprises: the valve body, valve barrel and case are connected and are formed the three-position two-way valve, be connected with torque adjusting device on the case, swing joint has the feedback lever on the valve body, the other end of feedback lever is connected with the valve barrel, be provided with pump load hydraulic fluid port on the valve body, get into pump servo piston hydraulic fluid port and draining port, control pump load hydraulic fluid port gets into pump servo piston hydraulic fluid port pressure oil, promote servo piston drive sloping cam plate angle and produce the change, servo piston drives the feedback lever rotation simultaneously and drives the valve barrel and move in the servo piston opposite direction, make and get into pump servo piston hydraulic fluid port and pump load hydraulic fluid port switch-on or with draining port switch-on.

However, the torque control device for the axial plunger pump still has some defects, and the pressure cavity B of the torque control device plays a role of both a pilot action and a communication oil way when in use, so that the transient pressure change when the pump load oil port P is communicated with the oil port Ps of the servo piston entering the pump can generate a large influence on the pilot force of the pressure cavity B, so that the pressure pulsation of the pump fluctuates, and the variable stability of the pump is poor.

Disclosure of Invention

The invention aims to solve the problems in the prior art, and provides a torque control device for a plunger pump, which solves the problem of unstable torque control.

The purpose of the invention can be realized by the following technical scheme:

the torque control device for the plunger pump comprises a valve sleeve, a control rod arranged in the valve sleeve in a sliding mode and a preloading mechanism acting on the control rod, wherein an input oil groove and an output oil groove are formed in the side portion of the valve sleeve in a penetrating mode, a communication groove communicated with the input oil groove is formed between the control rod and the valve sleeve, the communication groove can conduct the input oil groove and the output oil groove when the control rod overcomes the action of the preloading mechanism to slide, the torque control device is characterized in that a pilot groove communicated with the input oil groove is formed in the side portion, located on one side, of the control rod, far away from the preloading mechanism, of the control rod, a stress area difference enabling the control rod to slide towards the preloading mechanism when oil enters the pilot groove is formed between the control rods on two sides of the pilot groove, and the control rods on two sides of the communication groove are equal in stress area along the axial direction.

The control rod is sleeved in the valve sleeve, and the preloading mechanism acts on the control rod to realize the sliding of the control rod in the valve sleeve. A through groove is formed between the control rod and the valve sleeve, and in an initial state, namely under the condition that the acting force of the preloading mechanism is not overcome by the control rod, the communication groove is only communicated with the input oil groove. The guide groove is further arranged between the control rod and the valve sleeve, the guide groove is communicated with the input oil groove and is mutually independent with the communication groove, after hydraulic oil enters the guide groove, because the stress area difference which enables the control rod to slide towards the preloading mechanism is formed between the control rods on two sides of the guide groove when oil enters the guide groove, the guide groove can push the control rod to move towards the preloading mechanism, when the generated pushing force is larger than the acting force of the preloading mechanism, the communication groove is communicated with the output oil groove, the input oil groove is also communicated with the input oil groove, the communication of the input oil groove and the output oil groove is realized through the communication groove, the pressure release is realized by the fact that the hydraulic oil flows into the output oil groove through the communication groove, the purpose of adjusting the pressure of the outlet of the plunger pump is achieved, and the control of the torque of the pump is completed. After hydraulic oil enters the first guide groove and the communication groove through the oil inlet, because the control rods on two sides of the communication groove are equal in stress area along the axial direction, when pressure generated in the first guide groove acts on the control rods, acting force of the pressure in the through groove acting on two sides of the control rods is equal, so that the first guide groove only plays a role of pushing the control rods when in work, and the communication groove only plays a role of pressure relief when in work. Because the first guide groove and the communication groove are mutually independent, when the oil pressure generated by the first guide groove pushes the control rod to overcome the acting force of the preloading mechanism, the communication groove realizes the pressure relief of the plunger pump, and simultaneously does not interfere with the instantaneous oil pressure of the first guide groove, thereby preventing the fluctuation of the pilot force and stably controlling the torque of the plunger pump.

In the torque control device for the plunger pump, the pilot groove and the communication groove are annular grooves, an area of a groove wall of the pilot groove close to the through groove of the pilot groove is larger than an area of a groove wall of the other side, and areas of groove walls of two sides of the communication groove are equal.

Because the area of one side groove wall of the pilot groove close to the through groove of the channel is larger than that of the other side groove wall, according to a pressure formula P, the F/S is obtained, when the pressure is fixed, the larger the stress area is, the larger the pressure is, the pressure close to the position of the communication groove in the first guide groove is larger than the pressure far away from the position of the communication groove in the first guide groove, so that the pilot groove can push the control rod to move towards the preloading mechanism after the oil is fed into the first guide groove, and because the areas of the two side groove walls of the communication groove are equal, the same is realized according to the pressure formula P, the acting forces of the pressure in the through groove on the two sides of the control rod are equal, so that the pilot groove only plays a role of pushing the control rod when in work, and the communication groove only plays a role of pressure relief when in work. Simultaneously, the guide groove and the communication groove are annular grooves, so that after oil is fed, the acting force acting on the control rod in the guide groove and the groove is more uniform, and the unilateral stress of the control rod is avoided.

In the torque control device for the plunger pump, the control rod is provided with a matching section II and a matching section III, the pilot groove is arranged between the matching section II and the matching section III, and the cross-sectional area of the matching section III is larger than that of the matching section II.

When hydraulic oil enters the first guide groove, according to a pressure formula P, the pressure is F/S, when the pressure is constant, the larger the stress area is, the larger the pressure is, namely F is P S, therefore, the pushing force generated by the first guide groove and the pushing direction are determined by the area difference between the third matching section and the second matching section, and as the cross-sectional area of the third matching section is larger than that of the second matching section, the pressure on one side of the third matching section in the pilot groove is larger than that on one side of the second matching section, so that the pushing force is determined to be towards one side of the third matching section, and when the generated pushing force is larger than a preset standard value of the preloading mechanism, the control rod overcomes the acting force of the preloading mechanism, so that the communication groove is communicated with the output oil port, and the pressure relief is realized to finish the adjustment of the pressure of the outlet of the plunger pump.

In the torque control device for the plunger pump, the control rod is further provided with a first matching section, the communication groove is formed between the first matching section and a third matching section, and the cross sectional area of the first matching section is the same as that of the third matching section.

Because the communication groove is arranged between the first matching section and the third matching section, according to a pressure formula P, F/S, when hydraulic oil enters the through groove, the control rod is pushed only through the first guide groove, and when the communication groove is communicated with the oil output groove, fluctuation of instantaneous pressure generated by the through groove cannot influence the first guide groove, so that stable pilot force is kept, control and precision of torque of the plunger pump are improved, the first guide groove and the matching cavity are mutually independent by using the third matching section, the contact area between the control rod and the valve sleeve during reciprocating motion of the control rod is increased, and the service life of the control rod is prolonged.

In the above-described torque control device for a plunger pump, the input oil groove includes a first hole portion and a second hole portion, one port of the first hole portion communicates with one port of the second hole portion, the other port of the first hole portion communicates with the communication groove, and the other port of the second hole portion communicates with the pilot groove.

After hydraulic oil enters the input oil groove, the hydraulic oil flows into the through groove through the first hole part, and the oil pressure change generated in the through groove is better prevented from influencing the pilot groove through the two hole parts if the two hole parts are guided in the groove first, so that the stability of torque adjustment of the plunger pump is further improved.

In the torque control device for the plunger pump, the torque control device further comprises a valve body, the valve sleeve is arranged in the valve body, an input oil port is arranged in the side portion of the valve body in a penetrating mode, the input oil groove further comprises a groove portion which is arranged on the outer wall of the valve sleeve and communicated with the input oil port, and the bottom wall of the groove portion is penetrated through by the hole portion I and the hole portion II.

The valve body lateral part runs through the input hydraulic fluid port that sets up and is linked together with the slot part in the input oil groove, and hole portion one is linked together with the diapire of hole portion two and slot part, so hydraulic oil gets into the oil groove through the input hydraulic fluid port after rethread hole portion one gets into first guide slot and ditch with hole portion two respectively and leads to the groove, through the setting of slot part, can make the hydraulic oil from the input hydraulic fluid port obtain the buffering and reduce instantaneous pressure and steady flow again and advance first guide slot and ditch and lead to the groove to this torque control device during operation's stability has been improved.

In the torque control device for a plunger pump, the groove portion is annular and the first hole portion is parallel to the second hole portion.

Through annular slot part for the even inflow hole portion one and the hole portion two of hydraulic oil in the slot part, further improvement this torque device during operation stability.

Compared with the prior art, this torque control device for plunger pump, through guide slot and communication groove mutual independence earlier, when the produced oil pressure of guide slot promotes the control lever and overcomes preloading mechanism's effort earlier, the pressure release of plunger pump is realized to the communication groove, and does not interfere the instantaneous oil pressure of guide slot earlier in the pressure release to prevent that the guide power from appearing undulantly, made the plunger pump moment of torsion obtain stable control. And the third matching section enables the first guide groove and the communication groove to be mutually independent, and simultaneously increases the contact area between the control rod and the valve sleeve, so that the friction area between the control rod and the valve sleeve is increased, and the service life of the control rod is prolonged.

Drawings

FIG. 1 is a cross-sectional view of the torque control device for the present plunger pump;

FIG. 2 is a schematic view showing a structure in which a valve sleeve and a control rod are engaged with each other in the torque control device for the plunger pump;

fig. 3 is a schematic structural view of a control lever in the torque control device for the plunger pump.

In the figure, 1, a valve body; 1a, an oil inlet; 1b, an output oil port; 1c, an oil drainage port; 2. A valve housing; 2a, inputting an oil groove; 2a1, groove; 2a2, aperture one; 2a3, aperture two; 2b, outputting an oil groove; 3. a control lever; 3a, a matching section II; 3b, a matching section III; 3c, matching the first section; 3d, oil through holes; 3e, guiding the groove firstly; 3f, a through groove; 4. a preload mechanism; 5. an oil drainage cavity; 6. a feedback lever; 7. and stopping the bolt.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1 and 3, the torque control device for the plunger pump includes a valve housing 2, a control rod 3 slidably disposed in the valve housing 2, and a preloading mechanism 4, wherein one end of the control rod 3 abuts against the preloading mechanism 4, a spring is disposed in the preloading mechanism 4, and the preloading mechanism 4 applies a spring force to the control rod 3. An input oil groove 2a and an output oil groove 2b are arranged on the side part of the valve housing 2 in a penetrating way, a first matching section 3c, a second matching section 3a and a third matching section 3b are arranged on the control rod 3, a first guide groove 3e is formed between the control rod 3 and the valve housing 2 through the second matching section 3a and the third matching section 3b, a through groove 3f is formed between the control rod 3 and the valve housing 2 through the first matching section 3c and the third matching section 3b, the pilot groove 3e is positioned on one side of the through groove 3f far away from the preloading mechanism 4, the first guide groove 3e and the through groove 3f are both communicated with the input oil groove 2a, and the stress area of the control rod 3 at the position close to the through groove 3f in the pilot groove 3e is larger than the stress area of the control rod 3 at the position far away from the through groove 3f in the pilot groove 3e because the cross-sectional area of the third matching section 3c is larger than the cross-sectional area of the second matching section 3a, therefore, according to the pressure formula P ═ F/S, when the pressure is constant, the larger the pressure is, i.e., F ═ P ═ S, the larger the pressure is, the more the pressure is, the first guide groove 3e is determined to generate the pushing force, which acts on the control rod 3 toward the side of the fitting section three 3b, i.e., the pushing force generated by the pilot groove 3e is, i.e., P ═ pi (D12-D22)/4, after the hydraulic oil enters the first guide groove 3e, the pilot groove 3e can realize the pushing of the control rod 3 toward the preloading mechanism 4, in the case that the pushing force generated by the first guide groove 3e is smaller than the initial spring force of the initial mechanism 4, the communication groove 3F is only communicated with the input oil groove 2a, in the case that generated by the initial spring force is greater than the initial spring force of the initial mechanism 4, make ditch logical groove 3f intercommunication output oil groove 2b, and also communicate input oil groove 2a simultaneously, realize that ditch logical groove 3f switches on input oil groove 2a and output oil groove 2b, after the disconnection intercommunication of ditch logical groove 3f and input oil groove 2a, control rod 3 stops moving, thereby accomplish hydraulic oil and flow in output oil groove 2b through ditch logical groove 3f and realize the pressure release, reach the purpose of adjusting plunger pump outlet pressure, accomplish the control of pump moment of torsion. Because the cross sectional area of the first matching section 3c is the same as that of the third matching section 3b, the stressed area of the control rod 3 at the position close to the first guide groove 3e in the communication groove 3f is equal to the stressed area of the control rod 3 at the position far from the first guide groove 3e in the communication groove 3f, and after hydraulic oil enters the through groove 3f, the acting force of the pressure in the communication groove 3f on the two sides of the control rod 3 is equal, so that the first guide groove 3e only plays a role in pushing the control rod 3 when in work, and the through groove 3f only plays a role in pressure relief when in work. Because the first guide groove 3e and the through groove 3f are independent from each other, when the oil pressure generated by the first guide groove 3e pushes the control rod 3 to overcome the acting force of the preloading mechanism 4, the communication groove 3f realizes the pressure relief of the plunger pump, and simultaneously does not interfere with the instantaneous oil pressure of the first guide groove 3e, thereby preventing the fluctuation of the pilot force and stably controlling the torque of the plunger pump. And the first guide groove 3e and the matching cavity 6 are mutually independent by utilizing the matching section III 3b, and meanwhile, the contact area between the control rod 3 and the valve sleeve 2 is increased when the control rod 3 reciprocates, so that the service life of the control rod 3 is prolonged.

Further, as shown in fig. 1 and fig. 3, the torque control device for the plunger pump further includes a valve body 1, the valve housing 2 is disposed in the valve body 1, an input oil port 1a and an output oil port 1b are arranged on a side portion of the valve body 1 in a penetrating manner, and an oil drainage port 1c is already arranged on the side portion of the valve body 1, wherein the input oil port 1a is communicated with the input oil groove 2a, the output oil port 1b is communicated with the output oil groove 2b, an oil drainage cavity 5 is further formed between the control rod 3 and the valve housing 2, an oil through hole 3d is further formed in the control rod 3, and the oil drainage cavity 5 is communicated with the oil drainage port 1c and the oil through hole 3 d.

As shown in fig. 1 and 3, further, a feedback rod 6 is connected to the valve body 1 through a hinge, one end of the feedback rod 6 is connected to a plunger pump piston through a U-shaped groove, and the other end of the feedback rod is connected to the valve housing 2 through a hinge, when the plunger pump piston moves, the feedback rod 6 pushes the valve housing 2 to move in a direction opposite to a moving direction of the plunger pump piston, the valve housing 2 and the control rod 3 control the hydraulic oil of the input oil port 1a to enter the output oil port 1b, so as to push the plunger pump piston to change a swash plate angle, and at the same time, the plunger pump piston drives the feedback rod 6 to swing to drive the valve housing 2 to move in a direction opposite to the plunger pump piston, so that the output oil port 1b is communicated with the input oil port 1a through a groove 3f, or the input oil port 1a is communicated with the oil drain port 1c through an oil drain cavity 5, thereby realizing corresponding changes of a plunger pump load and a swash plate angle, that is control of input torque.

Further, as shown in fig. 1 and 3, the input oil groove 2a includes a first hole portion 2a2 and a second hole portion 2a3, one end of which is communicated with the outer side wall of the valve housing 2, and after entering the input oil groove 2a, the hydraulic oil flows into the through groove 3f through the first hole portion 2a2, flows into the pilot groove 3e through the second hole portion 2a3, and is better prevented from influencing the pilot groove 3e by the oil pressure change generated in the through groove 3f through the two hole portions, so that the torque regulation stability of the plunger pump is further improved; the input oil groove 2a further comprises a groove part 2a1 which is arranged on the outer wall of the valve housing 2 and communicated with the input oil port 1a, specifically, the groove part 2a1 is annular, one end hole of the hole part one 2a2 and one end hole of the hole part two 2a3 both penetrate through the bottom wall of the groove part 2a1, and the hole part one 2a2 is parallel to the hole part two 2a3, so that hydraulic oil enters the oil groove through the input oil port 1a and then enters the first guide groove 3e and the through groove 3f through the hole part one 2a2 and the hole part two 2a3 respectively, and through the arrangement of the annular groove part 2a1, the hydraulic oil from the input oil port 1a can be buffered to reduce the instantaneous pressure and then flows into the first guide groove 3e and the through groove 3f smoothly, and the stability of the torque control device during operation is improved.

As shown in fig. 1 and 3, a stopper bolt 7 is provided at one end of the valve body 1, the stopper bolt 7 seals the one end of the valve body 1, and a chamber communicating with the oil passage hole 3d is formed between the stopper bolt 7 and the valve housing 2.

As shown in fig. 1 and 3, further, a preset value of the preloading mechanism 4 is set; when the load pressure of the input oil port 1a is increased, hydraulic oil enters the first guide groove 3e and the communication groove 3f through the pump load input oil port 1a, the first guide groove 3e generates thrust, the control rod 3 is pushed to move towards the preloading mechanism 4 in a reverse direction by overcoming the preloading mechanism 4, the control rod 3 moves until the input oil port 1a is communicated with the output oil port 1b through the groove 3f, the hydraulic oil sequentially passes through the input oil port 1a and the output oil port 1b and then enters the plunger pump piston, the plunger pump piston is pushed to move hydraulically to enable the plunger pump swash plate to change at a small angle, the feedback rod 6 is driven to swing when the plunger pump piston moves, the feedback rod 6 swings to drive the valve sleeve 2 to move towards the preloading mechanism 4, the input oil port 1a and the output oil port 1b are disconnected, and the movement is stopped; when the load of the plunger pump changes to a small value within the range of the highest load and a set point, the control rod 3 is pushed by the spring force of the preloading mechanism 4 to move in the reverse direction, the output oil port 1b is communicated with the oil drainage port 1c through the oil drainage cavity 5, the plunger pump piston drives the swash plate to change at a large angle, meanwhile, the feedback rod 6 drives the valve sleeve 2 to move in the reverse direction of the plunger pump piston, the oil enters the output oil port 1b and the oil drainage port 1c to be disconnected, and the oil enters the input oil port 1a and stops moving when the output oil port 1b is communicated. The control of the input torque of the plunger pump is finished through the steps, and the input torque is close to a set value within a certain load pressure range.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.