Plunger pump rear cover mechanism with function of controlling oil path to actively unload

Abstract

According to the plunger pump rear cover mechanism with the control oil way active unloading function, the detachable active unloading mechanism is arranged on the rear cover body, unloading mechanisms of different specifications can be flexibly replaced or canceled according to the requirements of different users, and therefore accurate control over different application systems of a plunger pump is achieved. In addition, the design also considers the problem of oil liquid recovery in the unloading process, and through the design of the oil drainage channel, redundant oil liquid generated during unloading can smoothly return to the oil suction channel of the oil supplementing pump, so that the waste of the oil liquid is avoided, and the overall efficiency of the system is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to plunger pump technical field, concretely relates to a plunger pump rear cover mechanism with control oil path active unloading function. BACKGROUND

[0002] The plunger pump with unloading return middle position starting switch can only use the control valve with mechanical handle, and can only unload the control oil acting on the main control valve, so that the plunger pump rocker (swash plate) returns to the middle position to realize zero displacement output. SUMMARY

[0003] Therefore, the utility model provides a plunger pump rear cover mechanism with control oil path active unloading function.

[0004] To achieve the above object, the utility model provides the following technical scheme:

[0005] A plunger pump rear cover mechanism with control oil path active unloading function, including setting on the plunger pump rear cover body, the rear cover body is set up plunger pump connection oil channel, oil inlet and oil supplement pump oil suction passage, the rear cover body is set up unloading oil channel, the unloading oil channel is linked with plunger pump connection oil channel, the rear cover body is provided with active unloading mechanism, the active unloading mechanism is detachably connected with the rear cover body, the active unloading mechanism links the unloading oil channel, the active unloading mechanism controls the on-off of unloading oil channel, and the active unloading mechanism and oil supplement pump oil suction passage are provided with oil drain passage, and the both ends of the oil drain passage are communicated with the active unloading mechanism and oil supplement pump oil suction passage respectively.

[0006] Preferably, the unloading oil channel includes unloading oil channel one and unloading oil channel two, the both ends of the unloading oil channel one are communicated with the oil inlet and the active unloading mechanism respectively, the both ends of the unloading oil channel two are communicated with the active unloading mechanism and the plunger pump connection oil channel respectively, the rear cover body is set up plunger pump connection hole one and plunger pump connection hole two, the plunger pump connection hole one is communicated with the unloading oil channel one, the plunger pump connection oil channel is set up through the unloading oil channel one and the unloading oil channel two, and the plunger pump connection hole two is communicated with the end, away from the unloading oil channel, of the plunger pump connection oil channel.

[0007] Preferably, the active unloading mechanism comprises a brake valve and a screw plug, the rear cover body is provided with a brake valve mounting portion, the brake valve is detachably arranged on the brake valve mounting portion, the brake valve is communicated with the unloading oil passage I and the unloading oil passage II respectively, the brake valve controls the on-off between the unloading oil passage I and the unloading oil passage II, and the screw plug is arranged in the part of the plunger pump connecting oil passage between the unloading oil passage I and the unloading oil passage II.

[0008] Preferably, the rear cover body is provided with an axial connecting hole penetrating through the rear cover body in the center, the rear cover body has a pump body mounting surface and an oil supplement pump mounting surface, the pump body mounting surface is connected with the plunger pump, and the oil supplement pump is arranged on the oil supplement pump mounting surface.

[0009] Preferably, the rear cover body is provided with two symmetrical cast oil passages I and II and a pressure cut-off control oil passage, and the cast oil passages I and II are communicated with the pressure cut-off control oil passage and the plunger pump.

[0010] Preferably, the oil supplement pump mounting surface is concave to form an oil supplement pump mounting groove, the oil supplement pump is arranged in the oil supplement pump mounting groove, the oil supplement pump high-pressure port and the oil supplement pump oil suction port are arranged on the groove wall of the oil supplement pump mounting groove, two ends of the oil supplement pump high-pressure port are communicated with the oil supplement pump and the oil supplement pump mounting groove, and two ends of the oil supplement pump oil suction port are communicated with the oil supplement pump and the oil supplement pump oil suction passage.

[0011] Preferably, the rear cover body is provided with a filter, the filter is communicated with the inside of the rear cover body through an oil inlet, the rear cover body is provided with an oil inlet passage, the oil inlet passage is communicated with the oil inlet and the unloading oil passage respectively, the rear cover body is also provided with a working oil passage, one end of the working oil passage is communicated with the oil inlet passage, and the other end of the working oil passage is communicated with the plunger pump.

[0012] The utility model discloses a rear cover body, a plunger pump and an oil supplement pump are arranged on the rear cover body, and the plunger pump is connected with the oil supplement pump through an oil supplement pump connecting oil passage. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without paying creative labor.

[0014] Figure 2 is a schematic view of the rear cover assembly; Fig. 1 Figure 3 is a schematic view of the rear cover assembly;

[0015] Figure 4 is a schematic view of the rear cover assembly; Fig. 2 Figure 5 is a schematic view of the rear cover assembly;

[0016] Figure 6 is a schematic view of the rear cover assembly; Fig. 3 Figure 7 is a schematic view of the rear cover assembly from another angle. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be apparently and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those of ordinary skill in the art without any creative work fall within the scope of protection of the present application.

[0018] The present application will be further described below with reference to the drawings in the description.

[0019] The present application provides the following technical solutions:

[0020] As shown in Figure 1, Figs. 1-3 The present application discloses a kind of plunger pump rear cover mechanism with control oil path active unloading function, including the rear cover body 1 being set on plunger pump, the rear cover body 1 is opened plunger pump connection oil channel 2, oil inlet 3 and oil supplement pump oil suction passage 4, the unloading oil channel is opened on the rear cover body 1, the unloading oil channel is communicated with plunger pump connection oil channel 2, the active unloading mechanism 5 is set on the rear cover body 1, the active unloading mechanism 5 is detachably connected with rear cover body 1, the active unloading mechanism 5 is communicated unloading oil channel, the active unloading mechanism 5 controls the on-off of unloading oil channel, oil drain passage 6 is arranged between the active unloading mechanism 5 and oil supplement pump oil suction passage 4, the two ends of the oil drain passage 6 are communicated with the active unloading mechanism 5 and oil supplement pump oil suction passage 4 respectively.Specifically, in the present design, by setting detachable active unloading mechanism 5 on the rear cover body 1, according to the needs of different users, different specifications of unloading mechanism can be flexibly replaced, so as to realize the accurate control of plunger pump unloading pressure.In addition, the design also considers the oil recovery problem in unloading process, through the design of oil drain passage 6, it is ensured that the oil can return to oil supplement pump oil suction passage 4 smoothly during unloading, which avoids the waste of oil and improves the overall efficiency of the system.

[0021] Further, the unloading oil passage comprises an unloading oil passage one 7 and an unloading oil passage two 8, two ends of the unloading oil passage one 7 are communicated with the oil inlet 3 and the active unloading mechanism 5 respectively, two ends of the unloading oil passage two 8 are communicated with the active unloading mechanism 5 and the plunger pump connecting oil passage 2 respectively, the plunger pump connecting hole one 9 and the plunger pump connecting hole two 10 are arranged on the rear cover body 1, the plunger pump connecting hole one 9 is communicated with the unloading oil passage one 7, the plunger pump connecting oil passage 2 is arranged through the unloading oil passage one 7 and the unloading oil passage two 8, the threaded hole is arranged on the middle part of the unloading oil passage one 7 and the unloading oil passage two 8 of the connecting oil passage 2, which is used for installing the screw plug, the unloading oil passage one 7 and the unloading oil passage two 8 are blocked in the rear cover, and the plunger pump connecting hole two 10 is communicated with the end of the plunger pump connecting oil passage 2 away from the unloading oil passage.

[0022] Further, the active unloading mechanism 5 comprises a brake valve 11 and a screw plug (not shown in the figure), the brake valve mounting portion 13 is arranged on the rear cover body 1, the brake valve 11 is detachably arranged on the brake valve mounting portion 13, the brake valve 11 is communicated with the oil drain passage 6, the unloading oil passage one 7 and the unloading oil passage two 8 respectively, the brake valve 11 controls the on-off of the oil drain passage 6, the unloading oil passage one 7 and the unloading oil passage two 8, and the screw plug is arranged in the part of the plunger pump connecting oil passage 2 between the unloading oil passage one 7 and the unloading oil passage two 8. Specifically, in this embodiment, the screw plug is used to block the part of the unloading oil passage one 7 and the unloading oil passage two 8, so that the unloading oil passage one 7 and the unloading oil passage two 8 are communicated only through the brake valve 11, thereby ensuring the independent control of the unloading oil passage. The arrangement of the brake valve 11 enables the unloading oil passage to be flexibly opened or closed according to the actual working pressure during the unloading process, so as to achieve the purpose of accurately controlling the unloading.

[0023] Further, the shaft connecting hole 14 is arranged in the center of the rear cover body 1 and penetrates the rear cover body 1, the rear cover body 1 has a pump body mounting surface 15 and an oil supplement pump mounting surface 16, the pump body mounting surface 15 is connected with the plunger pump 18, and the oil supplement pump 17 is arranged on the oil supplement pump mounting surface 16.

[0024] Further, the rear cover body 1 is provided with two symmetrical casting oil channels 19 and 20 and a pressure cut-off control oil channel 21. The casting oil channels 19 and 20 are in communication with the pressure cut-off control oil channel 21 and the plunger pump. Specifically, in this embodiment, the casting oil channels 19 and 20 are arranged to make the flow of oil in the pump body more smooth, thereby improving the efficiency and performance of the pump. The introduction of the pressure cut-off control oil channel 21 makes it possible to monitor the oil pressure in real time and control the flow when the pressure reaches the set value, which is of great significance to ensure the stable operation of the pump and prevent potential failures. By precisely controlling the oil flow of the casting oil channels 19 and 20, the working state of the pump can be further optimized to ensure its optimal performance under various working conditions. In addition, the symmetrical design of the casting oil channels 19 and 20 meets the function of bidirectional output of the pump flow, which can be applied to both closed hydraulic systems and open hydraulic systems.

[0025] Further, the oil supplement pump mounting surface 16 is recessed to form an oil supplement pump mounting groove 22, the oil supplement pump 17 is arranged in the oil supplement pump mounting groove 22, the oil supplement pump high-pressure port 23 and the oil supplement pump suction port 24 are arranged on the groove wall of the oil supplement pump mounting groove 22, the two ends of the oil supplement pump high-pressure port 23 are in communication with the oil supplement pump and the oil supplement pump mounting groove, and the two ends of the oil supplement pump suction port 24 are in communication with the oil supplement pump 17 and the oil supplement pump suction channel 4.

[0026] Further, the rear cover body 1 is provided with a filter 25, which communicates with the inside of the rear cover body 1 through an oil inlet 3. The rear cover body 1 is provided with an oil inlet channel 26, which respectively communicates with the oil inlet 3 and the unloading oil channel. The rear cover body 1 is also provided with a working oil channel 27, one end of which communicates with an external oil pipe (not shown in the figure), and the other end of which communicates with the plunger pump. Specifically, in this embodiment, the filter 25 removes impurities in the oil to ensure the cleanliness of the oil, thereby prolonging the service life of the plunger pump control valve and other hydraulic components. The design of the oil inlet channel 26 enables the oil to flow smoothly from the filter 25 into the inside of the rear cover body 1, ensuring the stable operation of the hydraulic system. The presence of the pressure cut-off control oil channel 21 provides a safety valve for the system. When the system pressure exceeds the set value, the pressure cut-off control oil channel 21 can be opened, allowing excess control oil to flow back to the plunger pump housing cavity from the oil drain hole 35, thereby avoiding damage to the system caused by excessive pressure of the plunger pump. Through such design, the entire hydraulic system not only can work efficiently, but also has a good protection mechanism, ensuring the safety and reliability of the equipment. In this embodiment, the working oil channel 27 is provided with two working oil channels, i.e., working oil channel one 29 and working oil channel two 30, which respectively communicate with the casting oil channel one 19 and the casting oil channel two 20, thereby meeting the function of bidirectional output of the pump flow, and being applicable to both closed hydraulic systems and open hydraulic systems.

[0027] The plunger pump connection hole one 9 and the plunger pump connection hole two 10 on the rear cover communicate with the shell control oil channel (not shown in the figure) of the plunger pump. The plunger pump connection hole two 10 communicates with the unloading oil channel two 8, and the plunger pump connection hole one 9 communicates with the unloading oil channel two 8 through the plunger pump connection oil channel 2, and a screw thread is arranged in the plunger pump connection oil channel 2 between the unloading oil channel one 7 and the unloading oil channel two 8, and the unloading oil channel one 7 and the unloading oil channel two 8 are blocked by a screw plug. The plunger pump connection oil channel 2 communicates with the oil inlet channel 26 through the hole drilled in the unloading oil channel one 7, and the oil inlet channel 26 communicates with the oil inlet 3. The oil drain channel 6 communicates with the oil drain connection channel 28, and the casting oil channel 5 communicates with the built-in oil supplement pump oil suction channel 4 in the rear cover.

[0028] The hydraulic oil in the oil tank enters the low-pressure cavity through the oil supplement pump oil suction channel 4, and the built-in oil supplement pump converts the mechanical energy input by the transmission shaft into the pressure potential energy of the oil, i.e., the oil changes from low pressure to higher pressure control oil entering the high-pressure port 23 of the oil supplement pump. The control oil enters the external filter 25 from the high-pressure oil channel outlet, and enters the rear cover from the oil inlet 3 after being filtered by the filter 25.

[0029] The oil supplement overflow valve is installed in the oil supplement overflow valve mounting hole, and the oil inlet 3 is connected with the oil supplement overflow valve mounting hole through the oil inlet channel 26. When the oil supplement pump pressure is higher than the oil supplement overflow valve setting pressure, the valve opens and overflows, and the overflow hydraulic oil enters the housing cavity of the plunger pump.

[0030] At the same time, the unoverflowed pressure control oil liquid passes through the oil inlet channel 26, flows through the unloading oil channel one 7, and enters the external plate brake valve 11 (not shown in the figure, and there are four threaded holes for installing the plate brake valve 11). When and only when the external plate brake valve 11 connects the unloading oil channel one 7 and the unloading oil channel two 8, the control oil passes through the plate brake valve 11, enters the plunger pump connecting oil channel 2 and the unloading oil channel two 8, and then enters the plunger pump housing control oil path through the plunger pump connecting hole two 10 or the plunger pump connecting hole one 9. When the equipment and system encounter an emergency or need to brake, it is only necessary to control the plate brake valve 11 to cut off the connection between the unloading oil channel one 7 and the unloading oil channel two 8, and connect the unloading oil channel two 8 and the oil drain channel 6, so as to cut off the main control oil path, and the control oil cannot enter the plunger pump housing to act. At this time, the plunger pump loses the effect of the pressure control oil liquid, the plunger pump rocker (not shown in the figure) will automatically return to zero position, the cavity (not shown in the figure) formed by the control piston side and the housing becomes smaller, and the residual control oil liquid in the cavity will flow into the unloading oil channel two 8 through the plunger pump connecting hole two 10 or the plunger pump connecting hole one 9, the unloading oil channel two 8 is connected with the oil drain channel 6, and the residual control oil liquid can enter the oil drain connecting channel 28 through the oil drain channel 6, that is, enters the oil supplement pump suction channel 4 of the oil supplement pump at low pressure, so as to achieve the plunger pump housing end control oil pressure relief and discharge residual control oil liquid. The plunger pump finally has no working oil output, realizes the active cutting of the control oil path, and realizes the function of plunger pump unloading.

[0031] If the rear cover does not have the active unloading function of the control oil path, the four threaded holes for installing the plate brake valve 11 can not be processed, the oil drain channel 6 can not be processed, and the threaded hole in the plunger pump connecting oil channel 2 can not be processed, so that the unloading oil channel one 7 and the unloading oil channel two 8 are directly connected. In this way, even if the rear cover has different additional functions, the same pair of blank molds and the same kind of blank can be used for production, thereby reducing the research and development and production costs.

[0032] In addition, the unloading oil passage 28 is communicated with the process hole 34, the process hole 33 is communicated with the oil drain hole 35, the process hole 32 is communicated with the oil passage 28, and the process hole 21 is communicated with the oil passage 19. The process hole 31, the process hole 32, the process hole 33, and the process hole 34 all pass through the pressure cut-off valve pressure cut-off control oil passage 21, and the pressure measuring hole 36 is communicated with the pressure cut-off control oil passage 21. When the working oil pressure in the process hole 31 or the process hole 32 of the plunger pump exceeds the set value of the pressure cut-off valve, the control oil in the control oil unloading oil passage 28 can enter the process hole 33 through the process hole 34, and then enter the plunger pump shell cavity (not shown in the figure) through the oil drain hole 35 to release pressure, so as to realize the pressure cut-off protection function.

[0033] The above description of disclosed embodiments enables those skilled in the art to carry out or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A plunger pump rear cover mechanism with a control oil path active unloading function, comprising a rear cover body arranged on a plunger pump, a plunger pump connecting oil passage, an oil inlet and an oil supplement pump oil suction passage are arranged on the rear cover body, characterized in that: The rear cover body is provided with an unloading oil channel, the unloading oil channel is communicated with the plunger pump connecting oil channel, the rear cover body is provided with a driving unloading mechanism, the driving unloading mechanism is detachably connected with the rear cover body, the driving unloading mechanism is communicated with the unloading oil channel, the driving unloading mechanism controls the opening and closing of the unloading oil channel, a drain channel is arranged between the driving unloading mechanism and the oil supplement pump oil suction channel, and two ends of the drain channel are communicated with the driving unloading mechanism and the oil supplement pump oil suction channel respectively.

2. The plunger pump rear cover mechanism with a control oil passage active unloading function according to claim 1, characterized in that: The unloading oil channel comprises an unloading oil channel one and an unloading oil channel two, two ends of the unloading oil channel one are communicated with the oil inlet and the driving unloading mechanism respectively, two ends of the unloading oil channel two are communicated with the driving unloading mechanism and the plunger pump connecting oil channel respectively, the rear cover body is provided with a plunger pump connecting hole one and a plunger pump connecting hole two, the plunger pump connecting hole one is communicated with the unloading oil channel one, the plunger pump connecting oil channel is arranged through the unloading oil channel one and the unloading oil channel two, and the plunger pump connecting hole two is communicated with the end of the plunger pump connecting oil channel away from the unloading oil channel.

3. The plunger pump rear cover mechanism with a control oil passage active unloading function according to claim 2, characterized in that: The driving unloading mechanism comprises a brake valve and a screw plug, the rear cover body is provided with a brake valve mounting portion, the brake valve is detachably arranged on the brake valve mounting portion, the brake valve is communicated with the unloading oil channel one and the unloading oil channel two respectively, and the brake valve controls the opening and closing between the unloading oil channel one and the unloading oil channel two.

4. The plunger pump rear cover mechanism with a control oil passage active unloading function according to claim 1, characterized in that: The rear cover body is provided with an unloading oil channel, the unloading oil channel is communicated with the plunger pump connecting oil channel, the rear cover body is provided with a driving unloading mechanism, the driving unloading mechanism is detachably connected with the rear cover body, the driving unloading mechanism is communicated with the unloading oil channel, the driving unloading mechanism controls the opening and closing of the unloading oil channel, a drain channel is arranged between the driving unloading mechanism and the oil supplement pump oil suction channel, and two ends of the drain channel are communicated with the driving unloading mechanism and the oil supplement pump oil suction channel respectively.

5. The plunger pump rear cover mechanism with a control oil passage active unloading function according to claim 4, characterized in that: The rear cover body is provided with an unloading oil channel, the unloading oil channel is communicated with the plunger pump connecting oil channel, the rear cover body is provided with a driving unloading mechanism, the driving unloading mechanism is detachably connected with the rear cover body, the driving unloading mechanism is communicated with the unloading oil channel, the driving unloading mechanism controls the opening and closing of the unloading oil channel, a drain channel is arranged between the driving unloading mechanism and the oil supplement pump oil suction channel, and two ends of the drain channel are communicated with the driving unloading mechanism and the oil supplement pump oil suction channel respectively.

6. The plunger pump rear cover mechanism with a control oil passage active unloading function according to claim 4, characterized in that: The rear cover body is provided with an unloading oil channel, the unloading oil channel is communicated with the plunger pump connecting oil channel, the rear cover body is provided with a driving unloading mechanism, the driving unloading mechanism is detachably connected with the rear cover body, the driving unloading mechanism is communicated with the unloading oil channel, the driving unloading mechanism controls the opening and closing of the unloading oil channel, a drain channel is arranged between the driving unloading mechanism and the oil supplement pump oil suction channel, and two ends of the drain channel are communicated with the driving unloading mechanism and the oil supplement pump oil suction channel respectively.

7. The plunger pump rear cover mechanism with a control oil passage active unloading function according to claim 1, characterized in that: The rear cover body is provided with an unloading oil channel, the unloading oil channel is communicated with the plunger pump connecting oil channel, the rear cover body is provided with a driving unloading mechanism, the driving unloading mechanism is detachably connected with the rear cover body, the driving unloading mechanism is communicated with the unloading oil channel, the driving unloading mechanism controls the opening and closing of the unloading oil channel, a drain channel is arranged between the driving unloading mechanism and the oil supplement pump oil suction channel, and two ends of the drain channel are communicated with the driving unloading mechanism and the oil supplement pump oil suction channel respectively.

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