Series hydraulic pump
By setting an oil charge pump only in the rear pump of the series hydraulic pump and performing maintenance through the maintenance port of the rear pump shell cover, the problems of high maintenance cost and short service life in the existing technology are solved, and a low-cost and long-life maintenance effect is achieved.
Patent Information
- Application Number
- CN202422696361.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-06
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-11-06
AI Technical Summary
When the charge pump of an existing tandem hydraulic pump fails, the connection locations of multiple hydraulic pumps need to be disassembled, which increases maintenance costs and easily introduces contaminants, shortening the service life.
A series hydraulic pump is designed, in which only an oil charge pump is set in the rear pump, and maintenance is carried out through the maintenance port of the rear pump shell cover, which simplifies the structure and reduces the number of disassembly connection locations. The oil charge pump can be repaired by only removing the rear pump shell cover.
It reduces maintenance costs, reduces the risk of debris ingress, and extends the service life of the hydraulic pump.
Smart Images
Figure CN223482836U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of hydraulic component technology, and in particular to a series hydraulic pump. Background Technology
[0002] In engineering practice, to increase flow rate and head, multiple hydraulic pumps with identical structures are often connected end-to-end, with their internal pumps connected in series. Each hydraulic pump is equipped with a replenishing pump and its associated equipment. When the output of the pump is insufficient, hydraulic oil can be introduced into the inlet of the replenishing pump, which then outputs the hydraulic oil to the outlet of the pump. However, taking two hydraulic pumps connected in series as an example, since the housing of the rear pump is connected to the housing cover of the front pump, if the replenishing pump on the hydraulic pump fails, it is necessary to disconnect the faulty hydraulic pump from its adjacent pump before repairing the replenishing pump and its associated equipment. This increases maintenance costs and makes it easier for external contaminants to enter the front pump, affecting its service life. Therefore, there is an urgent need for a series-connected hydraulic pump with lower maintenance costs and a longer service life. Utility Model Content
[0003] The purpose of this invention is to provide a series hydraulic pump to solve the problems existing in the prior art, with lower maintenance costs and longer service life.
[0004] To achieve the above objectives, this utility model provides the following solution:
[0005] This utility model provides a series hydraulic pump, comprising: multiple hydraulic pumps, each hydraulic pump including a sub-pump and a housing, the sub-pump being disposed within the housing, the housings of each hydraulic pump being connected sequentially, the sub-pumps on each hydraulic pump being arranged in series sequentially, one of the hydraulic pumps having a replenishing pump, the hydraulic pump having the replenishing pump being a rear pump, the housing of the rear pump including a body and a cover, a maintenance port being provided on one side of the body, the cover being detachably connected to the body and capable of closing the maintenance port, each sub-pump having two oil ports, the oil outlet of the replenishing pump being able to communicate with at least one oil port on each sub-pump, and the oil inlet of the replenishing pump being used to introduce hydraulic oil.
[0006] Preferably, each of the pumps has two ports for connecting to the inlet and outlet of the motor, respectively, and the pump is a variable displacement pump.
[0007] Preferably, it also includes a first oil passage, wherein the two oil ports on each of the sub-pumps are connected and communicate with one end of the first oil passage, and the end of each first oil passage away from the sub-pump is a first end. Each first end extends out of the housing and communicates with the outside. The oil outlet of the replenishing pump is connected to the first oil passage between each of the sub-pumps and the first end through a second oil passage. Each of the second oil passages is provided with a one-way valve, and the oil in the replenishing pump can pass through the one-way valve and flow into the first oil passage.
[0008] Preferably, it also includes a safety relief valve, wherein each of the one-way valves is connected in parallel with one of the safety relief valves.
[0009] Preferably, each of the safety relief valves has a pressure testing port, and each of the pressure testing ports is used to connect to a pressure measuring instrument.
[0010] Preferably, there are two hydraulic pumps, namely a front pump and a rear pump, and the maintenance port on the rear pump is located on the side of the housing away from the front pump.
[0011] Preferably, it also includes a replenishing overflow valve, which is disposed inside the rear pump and is connected to the oil outlet of the replenishing pump.
[0012] Preferably, both the front pump and the rear pump have oil guide ports on their housings, the oil guide ports on the front pump and the rear pump are connected, and the front pump and / or the rear pump also have drain ports, through which the hydraulic oil inside the housings of the front pump and the rear pump can be discharged from the housings.
[0013] Preferably, the cover is connected to the housing body around the service port via a flange.
[0014] Preferably, the replenishing pump is a fixed displacement pump.
[0015] The present invention achieves the following technical advantages over the prior art:
[0016] The series hydraulic pump provided by this utility model has only one replenishing pump in the rear pump, and replenishes oil to all the sub-pumps through this replenishing pump, which simplifies the structure of the series hydraulic pump. Moreover, when the replenishing pump fails, it is only necessary to remove the cover on the rear pump and maintain the replenishing pump through the maintenance port. Maintenance is convenient. Compared with disassembling the connection between each hydraulic pump, it reduces the risk of foreign matter entering and extends the service life. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0018] Figure 1 Internal structure diagram of the series hydraulic pump provided by this utility model;
[0019] In the diagram: 1. Front pump; 2. Rear pump; 3. Sub-pump; 4. Make-up pump; 5. First end; 6. Check valve; 7. Safety relief valve; 8. Make-up relief valve; 9. Pressure test port; 10. Oil guide port; 11. Drain port. Detailed Implementation
[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0021] The purpose of this invention is to provide a series hydraulic pump to solve the problems existing in the prior art, with lower maintenance costs and longer service life.
[0022] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0023] This utility model provides a series hydraulic pump, such as Figure 1 As shown, it includes: multiple hydraulic pumps, each hydraulic pump including a sub-pump 3 and a housing, the sub-pump 3 being disposed inside the housing, the housings of each hydraulic pump being connected in sequence, the sub-pumps 3 on each hydraulic pump being connected in series, one of the hydraulic pumps having a replenishing pump 4, the hydraulic pump having the replenishing pump 4 being a rear pump 2, the housing of the rear pump 2 including a housing body and a housing cover, a maintenance port being provided on one side of the housing body, the housing cover being detachably connected to the housing body and capable of closing the maintenance port, each sub-pump 3 having two oil ports, the oil outlet of the replenishing pump 4 being able to communicate with at least one oil port on each sub-pump 3, and the oil inlet of the replenishing pump 4 being used to introduce hydraulic oil.
[0024] The series hydraulic pump provided by this utility model allows each sub-pump 3 to connect to external equipment (for example, it can be used on a hydraulic jack, with one port connected to the oil tank and the other port connected to the hydraulic jack's oil tank). Simultaneously, the outlet of the supplementary pump 4 inside the rear pump 2 connects to at least one port on each sub-pump 3 (i.e., at least one port on the sub-pump 3 connects to both the external equipment and the outlet of the supplementary pump 4). The supplementary pump 4 replenishes oil to all sub-pumps 3, simplifying the structure of the series hydraulic pump. Furthermore, when the supplementary pump 4 malfunctions, maintenance can be performed simply by removing the cover on the rear pump 2 and accessing the maintenance port. This convenient maintenance avoids disassembling the connections between hydraulic pumps, reduces the risk of foreign matter entering, and extends the service life.
[0025] In a preferred embodiment of this first example, each of the sub-pumps 3 has two oil ports that are respectively connected to the oil inlet and outlet of the motor. The sub-pumps 3 are variable displacement pumps. When the motor rotates forward, the motor's oil inlet is connected to one oil port on each sub-pump 3, and the sub-pump 3 supplies oil to the motor. When the motor rotates in reverse, the oil inlet used during forward rotation becomes the oil outlet. At this time, by simply adjusting the variable displacement mechanism on the variable displacement pump to make the output direction of the variable displacement pump opposite to that during forward rotation of the motor, it is possible to coordinate with the forward and reverse rotation of the motor without disassembling the connection between the oil ports and the motor. The variable displacement mechanism can adjust the flow rate or output direction of the variable displacement pump.
[0026] In a preferred embodiment of this first example, a first oil circuit is also included. Two oil ports on each of the sub-pumps 3 are connected to one end of a first oil circuit. The end of each first oil circuit furthest from the sub-pump 3 is a first end 5. Each first end 5 extends out of the housing and communicates with the outside. The outlet of the replenishing pump 4 is connected to the first oil circuit between each sub-pump 3 and the first end 5 via a second oil circuit. A one-way valve 6 is provided on each of the second oil circuits, allowing the oil in the replenishing pump 4 to flow into the first oil circuit through the one-way valve 6. Each first end 5 is used to connect to the inlet or outlet of the motor. When the motor and the series hydraulic pump are used in combination, if the oil is insufficient, the pressure at the oil port connected to the motor's outlet will decrease. At this time, the pressure in the first oil circuit is lower than the pressure in the pipe between the replenishing pump 4 and the first oil circuit. The one-way valve 6 will open, and the oil output from the outlet of the replenishing pump 4 will enter the first oil circuit and be input to the motor's inlet through the other oil port of the sub-pump 3. By using check valve 6, backflow of oil is prevented when the oil pressure in the first oil circuit is high, thus improving safety.
[0027] In a preferred embodiment of this first example, a safety relief valve 7 is also included, with each safety relief valve 7 connected in parallel with a one-way valve 6. The safety relief valve 7 and the one-way valve 6 are connected in parallel. When the liquid pressure is high and exceeds the preset value of the relief valve, the relief valve opens, and hydraulic oil is discharged through the relief valve, thereby preventing the pressure before the valve from exceeding the preset value and causing danger, further improving the safety of the hydraulic pump.
[0028] In a preferred embodiment of this first example, each safety relief valve 7 has a pressure testing port 9, and each pressure testing port 9 is used to connect to a pressure measuring instrument. Using a pressure measuring instrument, the pressure of the hydraulic oil inside the hydraulic valve can be detected through the pressure testing port 9, thereby facilitating the operator's judgment of the hydraulic valve's condition.
[0029] In a preferred embodiment of this first example, two hydraulic pumps are provided, namely a front pump 1 and a rear pump 2. The maintenance port on the rear pump 2 is located on the side of the housing away from the front pump 1. With the maintenance port away from the front pump 1, it is less likely for debris to enter the front pump 1 after the cover is removed. Compared with the maintenance port being located on the side of the rear pump 2 closer to the front pump 1, this further improves the service life of the tandem hydraulic pumps.
[0030] In a preferred embodiment of this first example, a replenishing overflow valve 8 is also included. The replenishing overflow valve 8 is disposed inside the rear pump 2 and is connected to the oil outlet of the replenishing pump 4. When the replenishing pump 4 experiences excessive pressure due to a sudden increase in load, the overflow valve opens, excess hydraulic oil flows out, and the pressure drops below the preset pressure, thus providing a safety protection function.
[0031] In a preferred embodiment of this first example, both the front pump 1 and the rear pump 2 are provided with oil guide ports 10, which are connected to each other. The front pump 1 and / or the rear pump 2 are also provided with drain ports 11, allowing hydraulic oil inside the housings of both pumps to be discharged through the drain ports 11. Oil discharged from the safety relief valve 7 and the replenishing relief valve 8, or oil that has leaked accidentally, may enter the housing; in this case, it can be discharged through the drain ports 11 to prevent oil accumulation inside the housing. Preferably, both the front pump 1 and the rear pump 2 are provided with drain ports 11.
[0032] In a preferred embodiment of this first example, the cover is connected to the housing body around the service port via a flange. Connecting the cover and housing body via a flange makes disassembly more convenient.
[0033] In a preferred embodiment of this first example, the replenishing pump 4 is a fixed displacement pump. The displacement of the fixed displacement pump can be set as needed.
[0034] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.
Claims
1. A series hydraulic pump, characterized in that: include: Multiple hydraulic pumps are provided, each hydraulic pump including a sub-pump and a housing. The sub-pumps are disposed within the housing. The housings of each hydraulic pump are connected in sequence. The sub-pumps on each hydraulic pump are connected in series. One of the hydraulic pumps has a replenishing pump. The hydraulic pump with the replenishing pump is a rear pump. The housing of the rear pump includes a body and a cover. A maintenance port is provided on one side of the body. The cover is detachably connected to the body and can close the maintenance port. Each sub-pump has two oil ports. The oil outlet of the replenishing pump can communicate with at least one oil port on each sub-pump. The oil inlet of the replenishing pump is used to introduce hydraulic oil.
2. The tandem hydraulic pump according to claim 1, characterized in that: Each of the aforementioned pumps has two oil ports for connecting to the oil inlet and oil outlet of the motor, respectively, and the pump is a variable displacement pump.
3. The tandem hydraulic pump according to claim 2, characterized in that: It also includes a first oil circuit, wherein the two oil ports on each of the said pumps are connected and communicate with one end of the first oil circuit, and the end of each first oil circuit away from the pump is a first end. Each first end extends out of the housing and communicates with the outside. The oil outlet of the replenishing pump is connected to the first oil circuit between each of the said pumps and the first end through a second oil circuit. Each of the second oil circuits is provided with a check valve, and the oil in the replenishing pump can pass through the check valve and flow into the first oil circuit.
4. The tandem hydraulic pump according to claim 3, characterized in that: It also includes a safety relief valve, with each of the one-way valves connected in parallel with one of the safety relief valves.
5. The tandem hydraulic pump according to claim 4, characterized in that: Each of the aforementioned safety relief valves has a pressure test port, and each of the aforementioned pressure test ports is used to connect to a pressure measuring instrument.
6. The tandem hydraulic pump according to claim 4, characterized in that: The hydraulic pump is provided in two parts, namely a front pump and a rear pump, and the maintenance port on the rear pump is located on the side of the housing away from the front pump.
7. The tandem hydraulic pump according to claim 4, characterized in that: It also includes a replenishing overflow valve, which is installed inside the rear pump and is connected to the oil outlet of the replenishing pump.
8. The tandem hydraulic pump according to claim 6, characterized in that: Both the front pump and the rear pump have oil guide ports on their housings. The oil guide ports on the front pump and the rear pump are connected. The front pump and / or the rear pump also have drain ports, through which the hydraulic oil inside the housings of the front pump and the rear pump can be discharged from the housings.
9. The tandem hydraulic pump according to claim 1, characterized in that: The cover is connected to the housing body around the service port via a flange.
10. The tandem hydraulic pump according to claim 1, characterized in that: The replenishment pump is a fixed displacement pump.