A hand variable displacement plunger pump

Abstract

The utility model discloses a kind of manual variable plunger pumps, it includes cylinder body being rotatably arranged in pump shell, multiple plunger are slidably arranged in cylinder body, plunger is attached to thrust plate by spring, thrust plate is installed on the boss of variable head by thrust ball bearing, variable head is slidably arranged in back cover, variable head is equipped with first camber along its sliding direction, back cover is equipped with the second camber matched with first camber, variable head is equipped with connecting rod between two first cambers, connecting rod is connected with adjusting rod by ball hinge, adjusting rod is slidably arranged in back cover, adjusting rod is connected with position moving mechanism. Compared with prior art, the utility model is simple in structure, plunger rotation drives thrust plate to rotate around boss, thereby completing oil absorption and oil pressing. Position moving mechanism drives adjusting rod to move, drives connecting rod to move, moving rod drives the first camber of variable head to slide along second camber, so as to adjust the included angle of boss and cylinder body, to adjust the size of displacement of plunger pump in this way.

Description

Technical Field

[0001] This utility model relates to the field of plunger pump manufacturing technology, and in particular to a manual variable displacement plunger pump. Background Technology

[0002] Traditional piston pumps rotate the cylinder block, driving the rotation of pistons positioned axially along the cylinder. Each piston has a slipper at its end, with a ball joint at its head that connects to the piston's ball head. The slipper's bottom is a flat surface that rests against a swashplate. The relative rotation of the slipper on the swashplate causes the piston to reciprocate axially, thus enabling the pump to draw and pressurize oil. In practical applications, the piston pump's displacement must be matched to different operating conditions. Different displacements require different swashplate sizes (different sizes have different angles), thus requiring users to prepare a large number of swashplates. Furthermore, changing swashplates is relatively cumbersome. Utility Model Content

[0003] This invention provides a manual variable displacement piston pump to solve the problem of difficulty in adjusting the displacement of piston pumps.

[0004] This utility model provides a manual variable displacement piston pump, including a cylinder rotatably disposed within a pump housing. Multiple pistons are slidably disposed within the cylinder. Each piston is spring-loaded against a thrust plate. The thrust plate is mounted on a protruding post of a variable displacement head via a thrust ball bearing. The variable displacement head is slidably disposed within a rear cover. The variable displacement head has a first arc surface along its sliding direction. The rear cover has a second arc surface matching the first arc surface. A connecting rod is provided between the two first arc surfaces of the variable displacement head. The connecting rod is connected to an adjusting rod via a ball joint. The adjusting rod is slidably disposed within the rear cover and connected to a position moving mechanism. The rear cover is fixed to the pump housing.

[0005] Preferably, the variable head includes a support disk that matches the thrust ball bearing, and two symmetrical fins are fixed on the support disk. The first arc surface is disposed on the fins, and the fins are slidably connected to the rear cover.

[0006] Preferably, a portion of the first arc surface is located on the support plate.

[0007] Preferably, the rear cover is provided with a mounting groove, the bottom of the mounting groove is provided with a clearance groove, the adjusting rod passes through the clearance groove, two second arc surfaces are provided on the bottom of the mounting groove and located on both sides of the clearance groove, and the support plate is provided with a clearance arc surface that matches the clearance groove.

[0008] Preferably, the adjusting rod has a first groove on the side facing the variable head, and the variable head has a second groove at the adjusting rod that mates with the first groove.

[0009] Preferably, the width of the clearance groove is greater than the diameter of the adjusting rod.

[0010] Preferably, the rear cover has a retaining ring at the opening of the mounting groove, the retaining ring has a notch, and the retaining ring is engaged into the pump housing.

[0011] Preferably, the position moving mechanism includes a screw, which is rotatably connected to the rear cover and threadedly connected to an adjusting rod. The rear cover is provided with a displacement scale, and the screw is provided with an indicator line that cooperates with the displacement scale.

[0012] Preferably, the rear cover is provided with a baffle, and a cover is fixed on the rear cover. A sliding groove adapted to the protruding ring of the screw is provided between the baffle and the cover. The screw is rotatably connected to the baffle and the cover respectively.

[0013] Preferably, the axial cross-sections of the baffle and the cover are both T-shaped, a sealing ring is provided between the cover and the rear cover, and a sealing ring is also provided between the cover and the screw.

[0014] Compared with existing technologies, this utility model has a simple structure. The rotation of the cylinder body drives the plunger to rotate around the axis of the cylinder body, and the rotation of the plunger drives the thrust plate to rotate around the convex post, thereby completing the oil suction and oil pressure. The position moving mechanism drives the adjusting rod to move, which in turn drives the connecting rod to move. The moving rod causes the first arc surface of the variable displacement head to slide along the second arc surface, thereby adjusting the angle between the convex post and the cylinder body, that is, adjusting the tilt angle of the thrust plate, thereby adjusting the displacement of the plunger pump. In this structural design, displacement adjustment can be achieved without disassembling the back cover and replacing internal parts. The adjustment process is simple and the adjustment speed is fast. The variable displacement head is slidably set with the back cover to ensure that the variable displacement head will not rotate around its axis. The restraint of the connecting rod and the adjusting rod ensures that the tilt angle of the variable displacement head will not change arbitrarily. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a cross-sectional view of the present invention;

[0018] Figure 3 This is a schematic diagram of the variable header structure of this utility model;

[0019] Figure 4This is a schematic diagram of the structure of the back cover of this utility model;

[0020] Figure 5 for Figure 1 Enlarged schematic diagram of the structure at point A;

[0021] Figure 6 for Figure 2 Enlarged schematic diagram of the structure at point B;

[0022] Figure 7 This is a physical image of the present invention.

[0023] Figure label:

[0024] 1. Pump housing, 2. Cylinder block, 3. Piston, 4. Thrust plate, 5. Thrust ball bearing, 6. Variable displacement head, 61. Protruding post, 62. First arc surface, 63. Support plate, 64. Fin plate, 65. Clearance arc surface, 66. Second groove, 7. Rear cover, 71. Second arc surface, 72. Mounting groove, 73. Clearance groove, 74. Snap ring, 741. Notch, 8. Connecting rod, 9. Adjusting rod, 91. First groove, 100. Position moving mechanism, 01. Screw, 011. Protruding ring, 02. Displacement scale, 03. Indicator line, 04. Baffle, 05. Cover, 06. Sealing ring, 07. Fastening nut. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0026] See attached document Figure 1 and attached Figure 2 This embodiment provides a manual variable displacement piston pump, including a cylinder 2 rotatably disposed within a pump housing 1. Multiple pistons 3 are slidably disposed within the cylinder 2. The pistons 3 are spring-loaded against a thrust plate 4. The thrust plate 4 is mounted on a protrusion 61 of a variable displacement head 6 via a thrust ball bearing 5. The variable displacement head 6 is slidably disposed within a rear cover 7. The variable displacement head 6 has a first arc surface 62 along its sliding direction. (Refer to attached diagram) Figure 4The rear cover 7 has a second arc surface 71 that matches the first arc surface 62. The first arc surface 62 slides along the second arc surface 71. The variable head 6 has a connecting rod 8 between the two first arc surfaces 62. The connecting rod 8 is connected to the adjusting rod 9 by a ball joint. The adjusting rod 9 is slidably disposed inside the rear cover 7. The adjusting rod 9 is connected to a position moving mechanism 100. The rear cover 7 is fixed to the pump housing 1. In this utility model, the plunger 3 is pressed onto the thrust plate 4 by a spring. The rotation of the cylinder 2 drives the plunger 3 to rotate around the axis of the cylinder 2. The rotation of the plunger 3 drives the thrust plate 4 to rotate around the protrusion 61, thereby completing the oil suction and oil pressure. The position moving mechanism 100 drives the adjusting rod 9 to move, which in turn drives the connecting rod 8 to move. The moving rod drives the first arc surface 62 of the variable head 6 to slide along the second arc surface 71, thereby adjusting the angle between the axis of the variable head 6 and the cylinder 2, that is, adjusting the tilt angle of the thrust plate 4, thereby adjusting the displacement of the plunger pump. In this structural design, displacement adjustment can be achieved without disassembling the rear cover 7 or replacing internal parts, making the adjustment process simple and fast. The variable displacement head 6 is slidably mounted to the rear cover 7, ensuring that the variable displacement head 6 does not rotate around its axis. The limiting mechanisms of the connecting rod 8 and the adjusting rod 9 ensure that the tilt angle of the variable displacement head 6 does not change after adjustment. Furthermore, displacement adjustment is achieved through the rear cover 7, adjusting rod 9, position moving mechanism 100, connecting rod 8, variable displacement head 6, thrust ball bearing 5, and thrust plate 4, resulting in a simple structural design for the rear section of the plunger pump.

[0027] Specifically, the variable head 6 is provided with a positioning groove, and the adjusting rod 9 is inserted into the positioning groove of the variable head 6.

[0028] As another embodiment of this utility model: refer to the appendix Figure 3 The variable head 6 includes a support disk 63 that matches the thrust ball bearing 5. Two symmetrical fins 64 are fixed on the support disk 63. A first arc surface 62 is disposed on the fins 64. The fins 64 are slidably connected to the rear cover 7. The opposite sides of the two fins 64 are the sliding surfaces, which are adjacent to the first arc surface 62. Specifically, the connection between the sliding surface and the first arc surface 62 is a chamfered structure.

[0029] As another embodiment of this utility model: a portion of the first arc surface 62 is located on the support plate 63.

[0030] As another embodiment of this utility model: refer to the appendix Figure 4 The rear cover 7 has a mounting groove 72, which provides installation space for the thrust ball bearing 5 and the variable head 6. The mounting groove 72 is circular, and the bottom of the mounting groove 72 has a relief groove 73. The adjusting rod 9 passes through the relief groove 73. Two second arc surfaces 71 are set on the bottom of the mounting groove 72 and are located on both sides of the relief groove 73. The support plate 63 has a relief arc surface 65 that matches the relief groove 73. The design of the relief groove 73 and the relief arc surface 65 prevents the variable head 6 and the rear cover 7 from interfering when the first arc surface 62 slides along the second arc surface 71.

[0031] In another embodiment of this utility model: the adjusting rod 9 has a first groove 91 on the side facing the variable head 6, and the variable head 6 has a second groove 66 at the adjusting rod 9 that mates with the first groove 91. The connecting rod 8 passes through the second groove 66 and is inserted into the positioning groove. The first groove 91 and the second groove 66 are designed to prevent interference between the variable head 6 and the adjusting rod 9 when the first arc surface 62 slides along the second arc surface 71.

[0032] In another embodiment of this utility model, the width of the clearance groove 73 is greater than the diameter of the adjusting rod 9, and the width of the clearance arc surface 65 is greater than the diameter of the adjusting rod 9.

[0033] In another embodiment of this utility model: the rear cover 7 has a retaining ring 74 at the opening of the mounting groove 72, and the retaining ring 74 has a notch 741, which is inserted into the pump housing 1. The rear cover 7 is first attached to the pump housing 1, and then fixed to the rear cover 7 with bolts. A sealing ring 06 is provided between the rear cover 7 and the pump housing 1.

[0034] One embodiment of the position moving mechanism 100: Refer to the attached document. Figure 5 The position moving mechanism 100 includes a screw 01, which is rotatably connected to the rear cover 7 and threadedly connected to the adjusting rod 9. Rotating the screw 01 drives the adjusting rod 9 to move within the rear cover 7. The rear cover 7 is provided with a displacement scale 02, and the screw 01 is provided with an indicator line 03 that cooperates with the displacement scale 02. Specifically, the indicator line 03 is a straight groove on the adjusting rod 9. Through this structural design, when rotating the screw 01, the displacement is adjusted by referring to the indicator line 03 and the scale on the displacement scale 02. This structure has a high degree of integration, effectively simplifies the structure, and also facilitates displacement adjustment. Specifically, the upper end of the screw 01 has a hexagonal cross-section.

[0035] As another embodiment of this utility model: refer to the appendix Figure 6 The rear cover 7 is provided with a baffle 04 and a cover 05 is fixed on the rear cover 7. A sliding groove is provided between the baffle 04 and the cover 05 to match the protruding ring 011 of the screw 01. The protruding ring 011 can rotate in the sliding groove. The baffle 04 and the cover 05 prevent the screw 01 from moving in its axial direction. The screw 01 is rotatably connected to the baffle 04 and the cover 05 respectively.

[0036] As another embodiment of this utility model: the axial cross section of both the baffle 04 and the cover 05 is T-shaped, a sealing ring 06 is provided between the cover 05 and the rear cover 7, and a sealing ring 06 is also provided between the cover 05 and the screw 01.

[0037] As another embodiment of this utility model: the screw 01 is threadedly connected to the cap 05 with a fastening nut 07. After adjusting the discharge rate, tighten the fastening nut 07 to lock the screw 01, so as to prevent the screw 01 from shaking in the vibrating environment of the plunger pump.

[0038] As another embodiment of this utility model: the upper end face of the cover 05 is rectangular, and the cover 05 is fixed to the rear cover 7 by bolts.

[0039] As another embodiment of this utility model: the variable head 6 has a step at the protrusion 61 that cooperates with the thrust ball bearing 5.

[0040] As another embodiment of this utility model: the rear cover 7 is an integral structure. This structural design reduces the number of parts in the rear section of the plunger pump, making assembly easier.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A manually operated variable displacement piston pump, characterized in that, The system includes a cylinder rotatably mounted within a pump housing, with multiple plungers slidably disposed within the cylinder. Each plunger is spring-loaded against a thrust plate, which is mounted on a protrusion of a variable displacement head via a thrust ball bearing. The variable displacement head is slidably disposed within a rear cover, and has a first arc surface along its sliding direction. The rear cover has a second arc surface matching the first arc surface. A connecting rod is provided between the two first arc surfaces of the variable displacement head, and the connecting rod is connected to an adjusting rod via a ball joint. The adjusting rod is slidably disposed within the rear cover and is connected to a position moving mechanism. The rear cover is fixed to the pump housing.

2. The manual variable displacement piston pump according to claim 1, characterized in that, The variable head includes a support disk that matches the thrust ball bearing. Two fins are symmetrically fixed on the support disk. The first arc surface is disposed on the fin, and the fin is slidably connected to the rear cover.

3. The manual variable displacement piston pump according to claim 2, characterized in that, Part of the first arc surface is located on the support plate.

4. The manual variable displacement piston pump according to claim 3, characterized in that, The rear cover is provided with a mounting groove, the bottom of the mounting groove is provided with a clearance groove, the adjusting rod passes through the clearance groove, two second arc surfaces are provided on the bottom of the mounting groove and located on both sides of the clearance groove, and the support plate is provided with a clearance arc surface that matches the clearance groove.

5. The manual variable displacement piston pump according to claim 4, characterized in that, The adjusting rod has a first groove on the side facing the variable head, and the variable head has a second groove at the adjusting rod that mates with the first groove.

6. The manual variable displacement piston pump according to claim 5, characterized in that, The width of the clearance groove is greater than the diameter of the adjusting rod.

7. The manual variable displacement piston pump according to claim 6, characterized in that, The rear cover has a retaining ring at the opening of the mounting groove, and the retaining ring has a notch, so that the retaining ring can be inserted into the pump housing.

8. The manual variable displacement piston pump according to claim 7, characterized in that, The position moving mechanism includes a screw, which is rotatably connected to the rear cover and threadedly connected to an adjusting rod. The rear cover is provided with a displacement scale, and the screw is provided with an indicator line that cooperates with the displacement scale.

9. The manual variable displacement piston pump according to claim 8, characterized in that, The rear cover is provided with a baffle, and a cover is fixed on the rear cover. A sliding groove that matches the protruding ring of the screw is provided between the baffle and the cover. The screw is rotatably connected to the baffle and the cover respectively.

10. The manual variable displacement piston pump according to claim 9, characterized in that, The axial cross-sections of the baffle and the cover are both T-shaped. A sealing ring is provided between the cover and the rear cover, and a sealing ring is also provided between the cover and the screw.

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