Power unit of hydraulic pumping unit and corresponding hydraulic pumping unit
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F04B-047/04
F15B-021/14
F04B-009/10
F04B-049/12
F04B-049/22
F04B-049/00
출원번호
US-0890386
(2014-05-08)
등록번호
US-10260497
(2019-04-16)
우선권정보
CN-2013 1 0173892 (2013-05-10)
국제출원번호
PCT/CN2014/077034
(2014-05-08)
국제공개번호
WO2014/180322
(2014-11-13)
발명자
/ 주소
Lei, Zhengzhong
Sun, Pei
Chen, Yongbo
출원인 / 주소
Robert Bosch GmbH
대리인 / 주소
Maginot, Moore & Beck LLP
인용정보
피인용 횟수 :
0인용 특허 :
6
초록▼
Disclosed is a power unit of a hydraulic pumping unit, which comprises a motor; a pumping rod driving device for driving reciprocating movement of a pumping rod; a variable pump driven by the motor, the variable pump hydraulically connected to the pumping rod driving device; a secondary hydraulic co
Disclosed is a power unit of a hydraulic pumping unit, which comprises a motor; a pumping rod driving device for driving reciprocating movement of a pumping rod; a variable pump driven by the motor, the variable pump hydraulically connected to the pumping rod driving device; a secondary hydraulic control unit hydraulically connected to the pumping rod driving device; an energy accumulator being in transmission connection with the secondary hydraulic control unit; a sensor for setting a stroke of the pumping rod; a first control device adapted to, based on the signals from the sensor, set the discharge capacity of the variable pump to be zero during the declining process of the pumping rod and to be positive during the ascending process of the pumping rod to drive the pumping rod driving device; and a second control device adapted to based on the signals from the sensor, set the secondary hydraulic control unit to function as a motor for driving the energy accumulator to accumulate energy during the descending process of the pumping rod, and to be driven by the energy accumulator to function as a pump for driving the pumping rod driving device during the ascending process of the pumping rod. The present invention further discloses a corresponding hydraulic pumping unit. The hydraulic pumping unit has high energy recycling utilization efficiency and is simple and reliable.
대표청구항▼
1. A power unit of a hydraulic pumping unit, comprising: a motor;a pumping rod driver that drives reciprocating movement of a pumping rod;a variable pump driven by the motor, the variable pump hydraulically connected to the pumping rod driver;a secondary hydraulic control unit hydraulically connecte
1. A power unit of a hydraulic pumping unit, comprising: a motor;a pumping rod driver that drives reciprocating movement of a pumping rod;a variable pump driven by the motor, the variable pump hydraulically connected to the pumping rod driver;a secondary hydraulic control unit hydraulically connected to the pumping rod driver;an energy accumulator operably connected to the secondary hydraulic control unit and configured to store potential energy from the secondary hydraulic control unit;a sensor configured to generate signals based on a position of the pumping rod;a first control valve hydraulically connected to the variable pump and configured to, based on the signals from the sensor, set a flow through the variable pump to be zero during a descending motion of the pumping rod and to set the flow through the variable pump to be positive toward the pumping rod driver during an ascending motion of the pumping rod to drive the pumping rod driver; anda second control valve hydraulically connected to the secondary hydraulic control unit and configured to, based on the signals from the sensor, set the secondary hydraulic control unit to function as a motor and store potential energy in the energy accumulator during the descending motion of the pumping rod, and to set the secondary hydraulic control unit to be driven by the stored potential energy in the energy accumulator such that the secondary hydraulic control unit functions as a pump to drive the pumping rod driver during the ascending motion of the pumping rod. 2. The power unit according to claim 1, wherein the secondary hydraulic control unit is a bidirectional plunger pump. 3. The power unit according to claim 1, wherein each of the first and second control valves includes one selected from the group consisting of (i) a proportional relief valve, (ii) a proportional reversing valve, and (iii) a combination of an electromagnetic reversing valve and a pressure valve. 4. The power unit according to claim 1, wherein a direction in which the pumping rod driver drives the pumping rod is in a line with a moving direction of the pumping rod. 5. The power unit according to claim 1, further comprising: a control pump configured to supply the variable pump with control oil via the first control valve and to supply the secondary hydraulic control unit with the control oil via the second control valve, the control pump being in transmission connection with the variable pump and coaxially disposed with the motor and the variable pump. 6. The power unit according to claim 1, wherein the sensor is an analogue sensor or consists of an upper proximity switch and a lower proximity switch. 7. The power unit according to claim 1, further comprising: a hydraulic divider motor adapted to drive the pumping rod driver simultaneously with at least one additional pumping rod driver. 8. The power unit according to claim 1, wherein the pumping rod driver comprises an oil cylinder or hydraulic winch. 9. The power unit according to claim 1, further comprising: a check valve located in a hydraulic line between the variable pump and the pumping rod driver, the check valve configured to allow hydraulic oil to only flow from the variable pump to the pumping rod driver and to prevent any flow of the hydraulic oil from the pumping rod driver to the variable pump. 10. The power unit according to claim 1, wherein the energy accumulator is a flywheel mechanically connected to the secondary hydraulic control unit. 11. The power unit according to claim 1, further comprising: a hydraulically-controlled check valve located between the secondary hydraulic control unit and the pumping rod driver, the hydraulically-controlled check valve being hydraulically controlled into an open state during the descending motion of the pumping rod, and, the hydraulically-controlled check valve configured to prevent hydraulic oil from flowing from the pumping rod driver to the secondary hydraulic control unit in case of shutdown. 12. A hydraulic pumping unit, comprising: a pumping rod; andat least one power unit including: a motor,a pumping rod driver that drives reciprocating movement of the pumping rod,a variable pump driven by the motor, the variable pump hydraulically connected to the pumping rod driver,a secondary hydraulic control unit hydraulically connected to the pumping rod driver,an energy accumulator operably connected to the secondary hydraulic control unit and configured to store potential energy from the secondary hydraulic control unit,a sensor configured to generate signals based on a position of the pumping rod,a first control valve hydraulically connected to the variable pump and configured to, based on the signals from the sensor, set a flow through the variable pump to be zero during a descending motion of the pumping rod and to set the flow through the variable pump to be positive toward the pumping rod driver during an ascending process of the pumping rod to drive the pumping rod driver, anda second control valve hydraulically connected to the secondary hydraulic control unit and configured to, based on the signals from the sensor, set the secondary hydraulic control unit to function as a motor to store potential energy in the energy accumulator during the descending motion of the pumping rod, and to set the secondary hydraulic control unit to be driven by the stored potential energy in the energy accumulator such that the secondary hydraulic control unit functions as a pump to drive the pumping rod driver during the ascending motion of the pumping rod.
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