Bidirectional pump

Abstract

A bidirectional pump includes a valve unit including a valve seat body and a movable shuttle rod, a gear pump unit provided on the valve seat body, a drive motor provided on the valve seat body, and a non-return unit. An output oil channel, a first oil inlet flow channel, a second oil inlet flow channel and an oil return flow channel are formed in the valve seat body, and the output oil channel is provided with a first output hole section, a second output hole section and an output connecting hole section. And the movable shuttle rod can move between a first blocking position for blocking the communication between the first oil inlet flow channel and the output connecting hole section and a second blocking position for blocking the communication between the second oil inlet flow channel and the output connecting hole section relative to the output oil channel. The driving motor is used for driving the gear pump unit. The non-return unit comprises a first non-return valve and a second non-return valve. The output direction of the hydraulic oil of the output oil channel is switched by controlling the driving motor to rotate forwards and backwards, the bidirectional oil outlet effect is achieved, and an existing direction control valve can be omitted.

Description

Technical Field

[0001] The utility model relates to a pump, in particular to a bidirectional pump. Background Art

[0002] like Figure 1 , 2 As shown in Figure 3, there is an oil pump that can be applied to a medical bed (not shown), comprising a seat 1, an external gear pump 2 arranged at the front end of the seat 1, a check valve 3 arranged at the seat 1 and formed with an oil suction hole 301, an electric motor 4 arranged at the rear end of the seat 1 and used to drive the external gear pump 2, and a flow channel unit 5. The flow channel unit 5 has an axial oil inlet flow channel 501 extending along an axial direction X and connected to the oil suction hole 301, a longitudinal oil outlet flow channel 502 extending along a longitudinal direction Z, and a transverse connecting flow channel 503 extending along a transverse direction Y and connecting the axial oil inlet flow channel 501 and the longitudinal oil outlet flow channel 502 (see Figure 4 ), and an oil return passage 504 that can be connected to an oil return tank (not shown).

[0003] like Figure 2 , 4 As shown in Figure 5, this oil pump can be used to drive a hydraulic cylinder 6 connected between the longitudinal oil outlet channel 502 and the oil return channel 504. The hydraulic cylinder 6 has a cylinder body 601 and a piston rod 602. When the motor 4 drives the external gear pump 2 to rotate, the hydraulic oil can be sucked into the oil suction hole 301 of the check valve 3, and discharged to the left half of the cylinder body 601 of the hydraulic cylinder 6 through the axial oil inlet channel 501, the transverse connecting channel 503 and the longitudinal oil outlet channel 502, forcing the piston rod 602 to move to the right to drive the medical bed to move.

[0004] However, since this type of oil pump can only discharge oil in one direction, in practice, if the piston rod 602 is forced to output force in the reverse direction, a directional control valve must be installed between the hydraulic cylinder 6 and this type of oil pump to achieve the purpose of bidirectional control of the output of the piston rod 602. This will increase the overall manufacturing cost and the number of hydraulic components. Utility Model Content

[0005] The purpose of the utility model is to provide a bidirectional pump which can overcome at least one disadvantage of the prior art.

[0006] Therefore, the bidirectional pump of the utility model comprises a valve unit, a gear pump unit, a driving motor, and a check unit.

[0007] The valve unit includes a valve seat body and a movable shuttle rod. The valve seat body is formed with an output oil passage, a first oil inlet flow passage, a second oil inlet flow passage, and an oil return flow passage. The output oil passage has a first output hole section, a second output hole section, and an output connecting hole section connecting the first output hole section and the second output hole section. The first oil inlet flow passage is connected to the first output hole section, the second oil inlet flow passage is connected to the second output hole section, and the oil return flow passage is connected to the output connecting hole section. The movable shuttle rod is movably arranged in the output oil passage along the lateral direction. The movable shuttle rod can move relative to the output oil passage between a first blocking position for blocking the connection between the first oil inlet flow passage and the output connecting hole section, and a second blocking position for blocking the connection between the second oil inlet flow passage and the output connecting hole section.

[0008] The gear pump unit is arranged on the valve seat body and includes a pump body and two gears. The pump body is formed with a pressure chamber, a first input oil channel connecting the pressure chamber and the first oil inlet channel, and a second input oil channel connecting the pressure chamber and the second oil inlet channel. The gears are rotatably arranged in the pressure chamber and mesh with each other.

[0009] The driving motor is arranged on the valve seat body and is used to drive one gear therein to drive another gear to rotate.

[0010] The check unit includes a first check valve arranged on the pump body and a second check valve arranged on the pump body, the first check valve having a first check valve body, a first check valve plug, and a first check elastic member, the first check valve body forming a first oil suction hole connected to the first input oil passage, the first check valve plug being arranged in the first oil suction hole, the first check elastic member abutting between the first check valve plug and the pump body, and having potential energy for driving the first check valve plug to block the first oil suction hole, the second check valve having a second check valve body, a second check valve plug, and a second check elastic member, the second check valve body forming a second oil suction hole connected to the second input oil passage, the second check valve plug being arranged in the second oil suction hole, the second check elastic member abutting between the second check valve plug and the pump body, and having potential energy for driving the second check valve plug to block the second oil suction hole.

[0011] In the utility model bidirectional pump, the first oil inlet flow channel has a first axial oil inlet hole section extending in the axial direction, a first transverse oil inlet hole section extending in the transverse direction and connected to the first axial oil inlet hole section, and a first longitudinal oil inlet hole section extending in the longitudinal direction and connecting the first transverse oil inlet hole section and the first output hole section; the second oil inlet flow channel has a second axial oil inlet hole section extending in the axial direction, a second transverse oil inlet hole section extending in the transverse direction and connected to the second axial oil inlet hole section, and a second longitudinal oil inlet hole section extending in the longitudinal direction and connecting the second transverse oil inlet hole section and the second output hole section.

[0012] The utility model bidirectional pump, the first input oil passage has a first transverse input hole section extending along the transverse direction and connected to the pressure chamber, a first axial input hole section extending along the axial direction and connected to the first axial oil inlet hole section, and a first connecting cavity section extending along the axial direction and connecting the first transverse input hole section and the first axial input hole section, the first oil suction hole of the first check valve body is connected to the first connecting cavity section, the first check elastic member is located in the first connecting cavity section, the second input oil passage has a second transverse input hole section extending along the transverse direction and connected to the pressure chamber, a second axial input hole section extending along the axial direction and connected to the second axial oil inlet hole section, and a second connecting cavity section extending along the axial direction and connecting the second transverse input hole section and the second axial input hole section, the second oil suction hole of the second check valve body is connected to the second connecting cavity section, and the second check elastic member is located in the second connecting cavity section.

[0013] The bidirectional pump of the utility model further comprises a pressure regulating unit, the valve seat body further comprises a first pressure relief channel connected to the first axial oil inlet hole section, and a second pressure relief channel connected to the second axial oil inlet hole section, the pressure regulating unit comprises a first pressure regulating valve arranged on the valve seat body, and a second pressure regulating valve arranged on the valve seat body, the first pressure regulating valve is used for selectively blocking the first pressure relief channel, and the second pressure regulating valve is used for selectively blocking the second pressure relief channel.

[0014] The utility model bidirectional pump, the first pressure relief flow channel has a first longitudinal pressure relief hole section extending along the longitudinal direction and connected to the first axial oil inlet hole section, a first axial pressure relief hole section extending along the axial direction, and a first pressure relief cavity section extending along the longitudinal direction and connecting the first longitudinal pressure relief hole section and the first axial pressure relief hole section, the second pressure relief flow channel has a second longitudinal pressure relief hole section extending along the longitudinal direction and connected to the second axial oil inlet hole section, a second axial pressure relief hole section extending along the axial direction, and a second pressure relief cavity section extending along the longitudinal direction and connecting the second longitudinal pressure relief hole section and the second axial pressure relief hole section, the first pressure regulating valve has a first pressure regulating valve section screwed on the valve seat body and extending into the first pressure relief cavity section A bolt, a first pressure-regulating valve plug arranged in the first pressure-relief chamber and extending into the first longitudinal pressure-relief hole section, and a first pressure-regulating elastic member abutting between the first pressure-regulating bolt and the first pressure-regulating valve plug, the first pressure-regulating elastic member having potential energy for driving the first pressure-regulating valve plug to block the first longitudinal pressure-relief hole section, the second pressure-regulating valve having a second pressure-regulating bolt screwed on the valve seat body and extending into the second pressure-relief chamber section, a second pressure-regulating valve plug arranged in the second pressure-relief chamber section and extending into the second longitudinal pressure-relief hole section, and a second pressure-regulating elastic member abutting between the second pressure-regulating bolt and the second pressure-regulating valve plug, the second pressure-regulating elastic member having potential energy for driving the second pressure-regulating valve plug to block the second longitudinal pressure-relief hole section.

[0015] In the bidirectional pump of the utility model, the aperture of the output connecting hole section is smaller than the aperture of the first output hole section and the aperture of the second output hole section, the output oil passage also has a first shoulder defined between the first output hole section and the output connecting hole section, and a second shoulder defined between the second output hole section and the output connecting hole section, the movable shuttle rod has a first truncated cone portion, and a second truncated cone portion spaced apart from the first truncated cone portion in the transverse direction, the outer diameter of the first truncated cone portion increases from the inside to the outside in the transverse direction, and the outer diameter of the second truncated cone portion increases from the inside to the outside in the transverse direction, when the movable shuttle rod is in the first blocking position, the first truncated cone portion is in liquid-tight contact with the first shoulder, and the second truncated cone portion is separated from the second shoulder, and when the movable shuttle rod is in the second blocking position, the second truncated cone portion is in liquid-tight contact with the second shoulder, and the first truncated cone portion is separated from the first shoulder.

[0016] The beneficial effect of the utility model is that the utility model utilizes the flow channel configuration of the valve seat body of the valve unit in combination with the movable shuttle rod, and cooperates with the design of the gear pump unit, the drive motor and the first check valve and the second check valve of the check valve unit, so as to switch the output direction of the hydraulic oil in the output oil channel by controlling the forward and reverse rotation of the drive motor, thereby producing a two-way oil output effect. In this way, the utility model can omit the existing directional control valve, thereby effectively reducing the overall manufacturing cost and reducing the number of hydraulic components. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an incomplete partial cross-sectional top view of an existing oil pump;

[0018] Figure 2 It is a front view of the existing oil pump;

[0019] Figure 3 It is a left side view of the existing oil pump;

[0020] Figure 4 It is a partial cross-sectional bottom view of the existing oil pump;

[0021] Figure 5 It is along Figure 3 A cross-sectional view taken along line V-V in FIG. 1 shows that the oil pump is used in combination with a hydraulic cylinder;

[0022] Figure 6 It is an incomplete partial cross-sectional top view of an embodiment of the bidirectional pump of the utility model;

[0023] Figure 7 is a front view of the embodiment;

[0024] Figure 8 is an incomplete left side view of the embodiment;

[0025] Fig. 9 is an incomplete right side view of the embodiment;

[0026] Fig.10 is an incomplete, partially cut-away bottom view of the embodiment;

[0027] Fig.11 It is along Fig. 9 A sectional view taken along the line ⅩⅠ-ⅩⅠ in FIG.

[0028] Fig.12 It is along Fig. 9 A sectional view taken along the line ⅩⅡ-ⅩⅡ in FIG.

[0029] Fig.13 is similar to Figure 7, illustrating a movable shuttle rod of a valve unit of the embodiment in a second blocking position;

[0030] Fig.14 is similar to Fig.10 , illustrating a first check valve and a second check valve of a check unit of the embodiment in a connected state and a check state respectively;

[0031] Fig.15 is similar to Fig.11 , illustrating that the embodiment is used in conjunction with a hydraulic cylinder;

[0032] Fig.16 is similar to Fig.13 , illustrating that the movable shuttle rod is in a first blocking position;

[0033] Fig.17 is similar to Fig.14 , illustrating that the first check valve and the second check valve are in a check state and a communication state respectively;

[0034] Fig.18 is similar to Fig.15 , illustrating the use of this embodiment in conjunction with the hydraulic cylinder;

[0035] Fig.19 Schematic diagram of an oil circuit configuration of this embodiment. DETAILED DESCRIPTION

[0036] The utility model is described in detail below with reference to the accompanying drawings and embodiments.

[0037] See also Figure 6 , 7 8 is an embodiment of a bidirectional pump 100 of the present invention. The bidirectional pump 100 includes a valve unit 10, a gear pump unit 20, a driving motor 30, a check unit 40, and a pressure regulating unit 50.

[0038] The valve unit 10 includes a valve seat body 11 and a movable shuttle rod 12 .

[0039] The valve seat body 11 is formed with an output oil passage 13 extending along a transverse direction Y, a first oil inlet passage 14, a second oil inlet passage 15 (see FIG. Fig. 9 ), an oil return channel 16 extending along an axial direction X, a first pressure relief channel 17, and a second pressure relief channel 18.

[0040] In this embodiment, if Figure 7 , 11As shown, the output oil passage 13 has a first output hole section 131, a second output hole section 132, an output connecting hole section 133 connecting the first output hole section 131 and the second output hole section 132, a first shoulder 134 defined between the first output hole section 131 and the output connecting hole section 133, and a second shoulder 135 defined between the second output hole section 132 and the output connecting hole section 133. The aperture of the output connecting hole section 133 is smaller than the aperture of the first output hole section 131 and the aperture of the second output hole section 132.

[0041] The first oil inlet channel 14 is in communication with the first output hole section 131 , the second oil inlet channel 15 is in communication with the second output hole section 132 , and the oil return channel 16 is in communication with the output connection hole section 133 .

[0042] In this embodiment, if Figure 8 , 10 As shown in FIG. 11 , the first oil inlet channel 14 has a first axial oil inlet hole section 141 extending along the axial direction X, a first transverse oil inlet hole section 142 extending along the transverse direction Y and connected to the first axial oil inlet hole section 141, and a first longitudinal oil inlet hole section 143 extending along a longitudinal direction Z and connecting the first transverse oil inlet hole section 142 and the first output hole section 131.

[0043] In this embodiment, if Fig. 9 , 10 As shown in FIG. 11 , the second oil inlet channel 15 has a second axial oil inlet hole section 151 extending along the axial direction X, a second transverse oil inlet hole section 152 extending along the transverse direction Y and connected to the second axial oil inlet hole section 151, and a second longitudinal oil inlet hole section 153 extending along the longitudinal direction Z and connecting the second transverse oil inlet hole section 152 and the second output hole section 132.

[0044] In this embodiment, if Figure 8 , 9 As shown in FIG. 12 , the first pressure relief passage 17 is connected to the first axial oil inlet hole section 141 , and the second pressure relief passage 18 is connected to the second axial oil inlet hole section 151 .

[0045] The first pressure relief channel 17 has a first longitudinal pressure relief hole section 171 extending along the longitudinal direction Z and connected to the first axial oil inlet hole section 141, a first axial pressure relief hole section 172 extending along the axial direction X, and a first pressure relief cavity section 173 extending along the longitudinal direction Z and connecting the first longitudinal pressure relief hole section 171 and the first axial pressure relief hole section 172.

[0046] The second pressure relief channel 18 has a second longitudinal pressure relief hole section 181 extending along the longitudinal direction Z and connected to the second axial oil inlet hole section 151, a second axial pressure relief hole section 182 extending along the axial direction X, and a second pressure relief cavity section 183 extending along the longitudinal direction Z and connecting the second longitudinal pressure relief hole section 181 and the second axial pressure relief hole section 182.

[0047] like Figure 7 , 11 As shown, the movable shuttle rod 12 is movably arranged in the output oil channel 13 along the transverse direction Y. In this embodiment, the movable shuttle rod 12 has a first truncated cone portion 121 and a second truncated cone portion 122 spaced apart from the first truncated cone portion 121 in the transverse direction Y. The outer diameter of the first truncated cone portion 121 increases from the inside to the outside in the transverse direction Y, and the outer diameter of the second truncated cone portion 122 increases from the inside to the outside in the transverse direction Y.

[0048] The movable shuttle rod 12 can be in a first blocking position (see FIG. 1 ) relative to the output oil passage 13 to block the first oil inlet passage 14 from communicating with the output connecting hole section 133. Fig.16 , 18 ), and a second blocking position (see Fig.13 , 15 )

[0049] like Fig.16 , 18 As shown in FIG. 1 , when the movable shuttle rod 12 is in the first blocking position, the first truncated cone portion 121 is in fluid-tight contact with the first shoulder portion 134, and the second truncated cone portion 122 is separated from the second shoulder portion 135. Fig.13 , 15 As shown, when the movable shuttle rod 12 is at the second blocking position, the second truncated cone portion 122 is in fluid-tight contact with the second shoulder portion 135 , and the first truncated cone portion 121 is disengaged from the first shoulder portion 134 .

[0050] like Figure 7 , 10 As shown, the gear pump unit 20 is arranged on the valve seat body 11, and includes a pump body 21, and two gears 22. The pump body 21 is formed with a pressure chamber 23, a first input oil channel 24 connecting the pressure chamber 23 and the first oil inlet channel 14, and a second input oil channel 25 connecting the pressure chamber 23 and the second oil inlet channel 15. The gears 22 are rotatably arranged in the pressure chamber 23 and mesh with each other.

[0051] The first input oil channel 24 has a first transverse input hole section 241 extending along the transverse direction Y and connected to the pressure chamber 23, a first axial input hole section 242 extending along the axial direction X and connected to the first axial oil inlet hole section 141, and a first connecting cavity portion 243 extending along the axial direction X and connecting the first transverse input hole section 241 and the first axial input hole section 242.

[0052] The second input oil channel 25 has a second transverse input hole section 251 extending along the transverse direction Y and connected to the pressure chamber 23, a second axial input hole section 252 extending along the axial direction X and connected to the second axial oil inlet hole section 151, and a second connecting cavity portion 253 extending along the axial direction X and connecting the second transverse input hole section 251 and the second axial input hole section 252.

[0053] like Figure 7 , 8 As shown, the driving motor 30 is disposed on the valve seat body 11 and is used to drive one gear 22 to drive another gear 22 to rotate.

[0054] like Figure 6 , 10 As shown, the check unit 40 includes a first check valve 41 disposed on the pump body 21 , and a second check valve 42 disposed on the pump body 21 .

[0055] The first check valve 41 has a first check valve body 411, a first check valve plug 412, and a first check elastic member 413. The first check valve body 411 is formed with a first oil suction hole 414 connected to the first connecting cavity 243 of the first input oil channel 24. The first check valve plug 412 is arranged in the first oil suction hole 414. The first check elastic member 413 is located in the first connecting cavity 243 and abuts between the first check valve plug 412 and the pump body 21. The first check elastic member 413 has potential energy to drive the first check valve plug 412 to block the first oil suction hole 414.

[0056] The second check valve 42 has a second check valve body 421, a second check valve plug 422, and a second check elastic member 423. The second check valve body 421 is formed with a second oil suction hole 424 connected to the second connecting chamber 253 of the second input oil channel 25. The second check valve plug 422 is arranged in the second oil suction hole 424. The second check elastic member 423 is located in the second connecting chamber 253 and abuts between the second check valve plug 422 and the pump body 21. The second check elastic member 423 has potential energy to drive the second check valve plug 422 to block the second oil suction hole 424.

[0057] like Figure 8 , 9As shown in Figures 1 and 12, the pressure regulating unit 50 has a first pressure regulating valve 51 disposed on the valve seat body 11, and a second pressure regulating valve 52 disposed on the valve seat body 11. The first pressure regulating valve 51 is used to selectively block the first pressure relief channel 17, and the second pressure regulating valve 52 is used to selectively block the second pressure relief channel 18.

[0058] In this embodiment, the first pressure regulating valve 51 has a first pressure regulating bolt 511 screwed on the valve seat body 11 and extending into the first pressure relief chamber 173, a first pressure regulating valve plug 512 arranged in the first pressure relief chamber 173 and extending into the first longitudinal pressure relief hole section 171, and a first pressure regulating elastic member 513 abutting between the first pressure regulating bolt 511 and the first pressure regulating valve plug 512, and the first pressure regulating elastic member 513 has potential energy for driving the first pressure regulating valve plug 512 to block the first longitudinal pressure relief hole section 171.

[0059] In this embodiment, the second pressure regulating valve 52 has a second pressure regulating bolt 521 screwed on the valve seat body 11 and extending into the second pressure relief chamber 183, a second pressure regulating valve plug 522 arranged in the second pressure relief chamber 183 and extending into the second longitudinal pressure relief hole section 181, and a second pressure regulating elastic member 523 abutting between the second pressure regulating bolt 521 and the second pressure regulating valve plug 522, and the second pressure regulating elastic member 523 has potential energy for driving the second pressure regulating valve plug 522 to block the second longitudinal pressure relief hole section 181.

[0060] By this, Fig.13 , 14As shown in Figures 15 and 19, the utility model can be used to drive a hydraulic cylinder 200 connected between the first output hole section 131 and the second output hole section 132, and the hydraulic cylinder 200 has a cylinder body 210 and a piston rod 220. When the driving motor 30 drives one of the gears 22 of the gear pump unit 20 to rotate counterclockwise and drives the other gear 22 to rotate clockwise, the first check valve plug 412 of the first check valve 41 no longer blocks the first oil suction hole. 414, the first oil suction hole 414 will become a vacuum state and absorb hydraulic oil from an oil tank 300, and flow into the second axial oil inlet hole section 151 of the second oil inlet flow channel 15 of the valve seat body 11 through the first input oil passage 24, the pressure chamber 23, and the second input oil passage 25 of the gear pump unit 20. In this process, the second check valve plug 422 of the second check valve 42 will block the second oil suction hole 424 to prevent the hydraulic oil in the second axial oil inlet hole section 151 from flowing back to the oil tank 300, and then Then, the hydraulic oil flowing into the second axial oil inlet hole section 151 will flow into the second output hole section 132 of the output oil passage 13 of the valve seat body 11 through the second transverse oil inlet hole section 152 and the second longitudinal oil inlet hole section 153. At this time, the hydraulic oil in the second output hole section 132 will force the movable shuttle rod 12 to move to the second blocking position, so that the second truncated cone portion 122 of the movable shuttle rod 12 contacts the second shoulder 135 of the output oil passage 13 to form a liquid-tight seal. In this way, the movable shuttle rod 12 can be sealed. The hydraulic oil in the second output hole section 132 is output to the right half of the cylinder body 210 of the hydraulic cylinder 200, forcing the piston rod 220 to move to the left and preventing the hydraulic oil in the second output hole section 132 from flowing back to the oil tank 300 and causing pressure loss. At this time, the hydraulic oil in the left half of the cylinder body 210 of the hydraulic cylinder 200 will flow back to the oil tank 300 via the first output hole section 131 of the output oil channel 13, the output connecting hole section 133 and the return oil channel 16, thereby completing the circulation of the hydraulic circuit.

[0061] In addition, it should be noted that if Fig. 9 , 12 As shown, when the hydraulic oil flows through the second axial oil inlet hole section 151 of the second oil inlet flow channel 15, since the second axial oil inlet hole section 151 is connected to the second pressure relief flow channel 18, if the internal pressure of the flow channel does not reach the set hydraulic pressure, the second pressure regulating valve plug 522 of the second pressure regulating valve 52 will not be pushed upward. However, if the internal pressure of the flow channel reaches the set hydraulic pressure, the second pressure regulating valve plug 522 of the second pressure regulating valve 52 will be pushed upward, so that the hydraulic oil can be discharged back to the oil tank 300 through the second pressure relief flow channel 18 (see Fig.19 ).

[0062] It is understandable that if Fig.16 , 17As shown in Figures 18 and 19, when the driving motor 30 drives one of the gears 22 of the gear pump unit 20 to rotate in the clockwise direction and drives the other gear 22 to rotate in the counterclockwise direction, all the above-mentioned actions will operate in the opposite manner. For example, the second check valve plug 422 of the second check valve 42 will no longer block the second oil suction hole 424, and the first check valve plug 412 of the first check valve 41 will block the first oil suction hole 414, and the oil will flow into the first axial oil inlet hole section 141 of the first oil inlet channel 14 of the valve seat body 11 instead. The hydraulic oil in the first output hole section 131 of the output oil passage 13 of the valve seat body 11 can force the movable shuttle rod 12 to move to the first blocking position, so that the hydraulic oil in the first output hole section 131 can be output to the left half of the cylinder body 210 of the hydraulic cylinder 200, forcing the piston rod 220 to move to the right. At this time, the hydraulic oil in the right half of the cylinder body 210 of the hydraulic cylinder 200 will flow back to the oil tank 300 via the second output hole section 132 of the output oil passage 13, the output connecting hole section 133 and the return oil channel 16, which will not be described in detail here.

[0063] It can be seen from this that by controlling the forward and reverse rotation of the driving motor 30, the output direction of the hydraulic oil in the output oil channel 13 can be switched to produce a two-way oil output effect.

[0064] Through the above description, the advantages of the utility model can be summarized as follows:

[0065] The utility model utilizes the flow channel configuration of the valve seat body 11 of the valve unit 10 in combination with the movable shuttle rod 12, and cooperates with the design of the gear pump unit 20, the drive motor 30 and the first check valve 41 and the second check valve 42 of the check unit 40. By controlling the forward and reverse rotation of the drive motor 30, the output direction of the hydraulic oil in the output oil channel 13 can be switched to produce a two-way oil output effect. Compared with the prior art, the utility model can omit the existing directional control valve, thereby effectively reducing the overall manufacturing cost and reducing the number of hydraulic components.

[0066] In summary, the bidirectional pump of the present invention can not only omit the existing directional control valve, but also effectively reduce the overall manufacturing cost and the number of hydraulic components, so the purpose of the present invention can be achieved.

[0067] The above description is only an embodiment of the present utility model, and should not be used to limit the scope of the present utility model. That is, all simple equivalent changes and modifications made according to the claims and the description of the present utility model are still within the scope of the present utility model.

Claims

1. A bidirectional pump, comprising a valve unit, a gear pump unit, a drive motor, and a check unit, characterized in that: The valve unit comprises a valve seat body and a movable shuttle rod, the valve seat body is formed with an output oil passage, a first oil inlet passage, a second oil inlet passage, and an oil return passage, the output oil passage has a first output hole section, a second output hole section, and an output connecting hole section connecting the first output hole section and the second output hole section, the first oil inlet passage is connected to the first output hole section, the second oil inlet passage is connected to the second output hole section, and the oil return passage is connected to the output connecting hole section, the movable shuttle rod is movably arranged on the output oil passage in a lateral direction, and the movable shuttle rod can move relative to the output oil passage between a first blocking position blocking the first oil inlet passage from being connected to the output connecting hole section, and a second blocking position blocking the second oil inlet passage from being connected to the output connecting hole section; The gear pump unit is arranged on the valve seat body and includes a pump body and two gears. The pump body is formed with a pressure chamber, a first input oil passage connecting the pressure chamber with the first oil inlet passage, and a second input oil passage connecting the pressure chamber with the second oil inlet passage. The gears are rotatably arranged in the pressure chamber and mesh with each other. The driving motor is disposed on the valve seat body and is used to drive one gear to drive another gear to rotate; and The check unit includes a first check valve arranged on the pump body and a second check valve arranged on the pump body, the first check valve having a first check valve body, a first check valve plug, and a first check elastic member, the first check valve body forming a first oil suction hole connected to the first input oil passage, the first check valve plug being arranged in the first oil suction hole, the first check elastic member abutting between the first check valve plug and the pump body, and having potential energy for driving the first check valve plug to block the first oil suction hole, the second check valve having a second check valve body, a second check valve plug, and a second check elastic member, the second check valve body forming a second oil suction hole connected to the second input oil passage, the second check valve plug being arranged in the second oil suction hole, the second check elastic member abutting between the second check valve plug and the pump body, and having potential energy for driving the second check valve plug to block the second oil suction hole.

2. The bidirectional pump according to claim 1, characterized in that: The first oil inlet channel has a first axial oil inlet hole section extending in the axial direction, a first transverse oil inlet hole section extending in the transverse direction and connected with the first axial oil inlet hole section, and a first longitudinal oil inlet hole section extending in the longitudinal direction and connecting the first transverse oil inlet hole section and the first output hole section. The second oil inlet channel has a second axial oil inlet hole section extending in the axial direction, a second transverse oil inlet hole section extending in the transverse direction and connected with the second axial oil inlet hole section, and a second longitudinal oil inlet hole section extending in the longitudinal direction and connecting the second transverse oil inlet hole section and the second output hole section.

3. The bidirectional pump according to claim 2, characterized in that: The first input oil passage has a first transverse input hole section extending along the transverse direction and connected to the pressure chamber, a first axial input hole section extending along the axial direction and connected to the first axial oil inlet hole section, and a first connecting cavity section extending along the axial direction and connecting the first transverse input hole section and the first axial input hole section. The first oil suction hole of the first check valve body is connected to the first connecting cavity section, and the first check elastic member is located in the first connecting cavity section. The second input oil passage has a second transverse input hole section extending along the transverse direction and connected to the pressure chamber, a second axial input hole section extending along the axial direction and connected to the second axial oil inlet hole section, and a second connecting cavity section extending along the axial direction and connecting the second transverse input hole section and the second axial input hole section. The second oil suction hole of the second check valve body is connected to the second connecting cavity section, and the second check elastic member is located in the second connecting cavity section.

4. The bidirectional pump according to claim 3, characterized in that: The bidirectional pump also includes a pressure regulating unit, the valve seat body also forms a first pressure relief channel connected to the first axial oil inlet hole section, and a second pressure relief channel connected to the second axial oil inlet hole section, the pressure regulating unit has a first pressure regulating valve arranged on the valve seat body, and a second pressure regulating valve arranged on the valve seat body, the first pressure regulating valve is used to selectively block the first pressure relief channel, and the second pressure regulating valve is used to selectively block the second pressure relief channel.

5. The bidirectional pump according to claim 4, characterized in that: The first pressure relief passage comprises a first longitudinal pressure relief hole section extending in the longitudinal direction and connected to the first axial oil inlet hole section, a first axial pressure relief hole section extending in the axial direction, and a first pressure relief cavity section extending in the longitudinal direction and connecting the first longitudinal pressure relief hole section and the first axial pressure relief hole section. The second pressure relief passage comprises a second longitudinal pressure relief hole section extending in the longitudinal direction and connected to the second axial oil inlet hole section, a second axial pressure relief hole section extending in the axial direction, and a second pressure relief cavity section extending in the longitudinal direction and connecting the second longitudinal pressure relief hole section and the second axial pressure relief hole section. The first pressure regulating valve comprises a first pressure regulating bolt threaded on the valve seat body and extending into the first pressure relief cavity section, a first pressure regulating bolt threaded on the valve seat body and extending into the first pressure relief cavity section, a second pressure regulating bolt threaded on the valve seat body and extending into the first pressure relief cavity section, a second pressure regulating bolt threaded on the valve seat body and extending into the first pressure relief cavity section, a first ... A first pressure-regulating valve plug disposed in the first pressure-relief chamber and extending into the first longitudinal pressure-relief hole section, and a first pressure-regulating elastic member abutting between the first pressure-regulating bolt and the first pressure-regulating valve plug, the first pressure-regulating elastic member having potential energy for driving the first pressure-regulating valve plug to block the first longitudinal pressure-relief hole section, the second pressure-regulating valve having a second pressure-regulating bolt threadedly disposed on the valve seat body and extending into the second pressure-relief chamber section, a second pressure-regulating valve plug disposed in the second pressure-relief chamber section and extending into the second longitudinal pressure-relief hole section, and a second pressure-regulating elastic member abutting between the second pressure-regulating bolt and the second pressure-regulating valve plug, the second pressure-regulating elastic member having potential energy for driving the second pressure-regulating valve plug to block the second longitudinal pressure-relief hole section.

6. The bidirectional pump according to claim 4, characterized in that: The aperture of the output connecting hole section is smaller than the apertures of the first output hole section and the second output hole section. The output oil passage also has a first shoulder defined between the first output hole section and the output connecting hole section, and a second shoulder defined between the second output hole section and the output connecting hole section. The movable shuttle rod has a first truncated cone portion, and a second truncated cone portion spaced apart from the first truncated cone portion in the transverse direction. The outer diameter of the first truncated cone portion increases from the inside to the outside in the transverse direction, and the outer diameter of the second truncated cone portion increases from the inside to the outside in the transverse direction. When the movable shuttle rod is in the first blocking position, the first truncated cone portion is in liquid-tight contact with the first shoulder, and the second truncated cone portion is separated from the second shoulder. When the movable shuttle rod is in the second blocking position, the second truncated cone portion is in liquid-tight contact with the second shoulder, and the first truncated cone portion is separated from the first shoulder.

Images