Plunger pump structure for drive-by-wire actuation

Abstract

The utility model relates to a drive-by-wire actuating plunger pump structure which comprises a plunger pump main body and a first plunger rod, a pump cavity is formed in the plunger pump main body, the first plunger rod extends out of the plunger pump main body from the pump cavity, and a first plunger pump piston is arranged in the pump cavity; an oil inlet and an oil outlet are formed in the plunger pump body, and an oil outlet one-way valve is arranged at the oil outlet and used for discharging oil. The first plunger pump piston is provided with an oil inlet channel communicated with the oil inlet, and the first plunger rod piston moves in the stroke to open and close the oil inlet channel. The plunger pump has the advantages that compared with a traditional plunger pump structure, a one-way valve body at an oil inlet is omitted, an oil inlet one-way valve steel ball is omitted, the plunger pump structure is further simplified, the size of the first plunger pump piston is reduced, and the production cost and the weight are reduced; the oil inlet mode is changed, the piston structure is simplified, and the size of the piston is reduced.

Description

Technical Field

[0001] The utility model relates to the field of automobile parts, in particular to a plunger pump structure for wire-controlled actuation. Background Art

[0002] The plunger pump is an important device in the hydraulic system. It relies on the reciprocating motion of the plunger in the cylinder to change the volume of the sealed working chamber to achieve oil suction and oil pressure. The existing plunger pump structure is as follows Figure 2 As shown, an oil inlet check valve and an oil outlet check valve are respectively provided at the oil inlet and the oil outlet of the plunger pump, and the working process is as follows:

[0003] Oil inlet stroke: Under the elastic force of the second plunger pump piston spring 26, the second plunger pump piston 29 and the second plunger rod 17 move leftward. The stroke of the second plunger rod 17 and the second plunger pump piston 29 are equal, generating negative pressure inside the second plunger pump body 22. Under the action of negative pressure, the oil inlet check valve inside the second plunger pump piston 29 opens, allowing oil to enter the second plunger pump body 22. At this time, the oil outlet check valve remains closed due to the elastic force of the second oil outlet check valve spring 24.

[0004] Oil discharge stroke: Under the action of external drive, the second plunger rod 17 and the second plunger pump piston 29 move to the right, and the stroke of the second plunger rod 17 and the second plunger pump piston 29 are equal. The oil inlet check valve in the second plunger rod 17 remains closed under the action of the oil inlet check valve spring 30; at this time, the pressure inside the second plunger pump body 22 increases, and the oil discharge check valve opens under the action of the internal pressure of the second plunger pump body 22, and the oil flows out of the second plunger pump body 22.

[0005] The existing plunger pump with an oil inlet check valve steel ball has a relatively complex structure. At the same time, the structure and process of the oil inlet check valve seat are more complex, the plunger rod process is more complex, and the plunger pump has more structural parts, which increases assembly time and difficulty. The processing is more difficult, resulting in high costs for the plunger pump. Utility Model Content

[0006] The technical problem to be solved by the present invention is to provide a plunger pump structure for wire-controlled actuation, which solves the above-mentioned problems mentioned in the background technology.

[0007] The utility model solves the above-mentioned technical problems with the following technical solutions: A plunger pump structure for wire-controlled actuation includes: a plunger pump body and a first plunger rod, wherein a pump cavity is formed in the plunger pump body, the first plunger rod extends from the pump cavity to the outside of the plunger pump body, and a first plunger pump piston is disposed in the pump cavity;

[0008] The plunger pump body is provided with an oil inlet and an oil outlet, and the oil outlet is provided with an oil outlet one-way valve for discharging oil; the first plunger pump piston is provided with an oil inlet channel connected to the oil inlet, and the oil inlet channel is opened and closed by the movement of the first plunger rod piston within the stroke.

[0009] The beneficial effects of the present invention are as follows: compared to the traditional plunger pump structure, by eliminating the one-way valve body at the oil inlet and omitting the oil inlet one-way valve steel ball, the plunger pump structure is further simplified, the size of the first plunger pump piston is reduced, and the production cost and weight are reduced; at the same time, the oil inlet method is changed. Since the oil inlet one-way valve steel ball is omitted, the piston structure is correspondingly simplified, the piston volume is reduced, and the processing method is changed from stamping to turning. At the same time, the processing technology and processing difficulty of the first plunger rod in the present application are further simplified, and the processing method is changed from milling to turning, which further reduces production costs. At the same time, due to the reduction of parts, assembly time is further saved.

[0010] On the basis of the above technical solution, the present invention can also be improved as follows.

[0011] Furthermore, the plunger pump body includes a first plunger rod guide sleeve, a first plunger rod star ring, a first plunger rod plastic pad, a first plunger pump ring filter, a first plunger pump body and a first plunger pump plug cover which are connected in sequence.

[0012] The beneficial effects of adopting the above-mentioned further scheme are: the first plunger rod guide sleeve, the first plunger rod star ring, the first plunger rod plastic pad, the first plunger pump ring filter, the first plunger pump pump body and the first plunger pump plug cover are connected in sequence to form the plunger pump main structure, and the first plunger rod guide sleeve can provide precise guidance for the first plunger rod, helping the first plunger rod to remain stable during the operation of the plunger pump and prevent the first plunger rod from deflecting or getting stuck; the first plunger rod star ring can play a role of sealing and shock absorption, and at the same time can prevent the first plunger rod from rotating during the operation of the plunger pump, thereby maintaining the normal operation of the plunger pump; the first plunger pump ring filter can protect the interior of the plunger pump from being affected by the external environment, and at the same time can filter out impurities entering the plunger pump to ensure the normal operation of the plunger pump.

[0013] Furthermore, the first plunger pump plugging cover is sleeved on the outside of one end of the first plunger pump body and abuts against the boss on the outer wall of the first plunger pump body;

[0014] The oil outlet is provided at one end of the first plunger pump body close to the first plunger pump plug cover, and the first plunger pump plug cover is provided with a valve cavity opposite to the oil outlet. The first oil outlet one-way valve steel ball and the first oil outlet one-way valve spring are installed in sequence in the valve cavity in the direction away from the oil outlet, and the first oil outlet one-way valve steel ball and the first oil outlet one-way valve spring form the oil outlet one-way valve.

[0015] The beneficial effects of adopting the above-mentioned further scheme are: the installation method of the first plunger pump body and the first plunger pump plug cover is simple, the oil outlet one-way valve is arranged opposite to the oil outlet, and when the internal pressure of the first plunger pump body increases, the oil outlet one-way valve can be opened under the action of the internal pressure of the first plunger pump body, allowing the oil to flow out of the first plunger pump body.

[0016] Furthermore, one end of the first plunger pump body facing away from the first plunger pump plugging cover extends into the first plunger pump annular filter and abuts against the step hole of the first plunger pump annular filter.

[0017] The beneficial effect of adopting the above further solution is that the inner cavity of the first plunger pump ring filter is a stepped hole structure, which facilitates installation with the first plunger pump body and improves the sealing performance of the plunger pump.

[0018] Furthermore, the first plunger pump piston is arranged in an internal cavity enclosed by the first plunger pump ring filter and the first plunger pump pump body, a first plunger pump piston sealing ring is arranged between the first plunger pump piston and the inner wall of the cavity, and a piston sealing ring limiting plate is arranged at the end of the first plunger pump piston and the first plunger pump piston sealing ring facing away from the first plunger rod.

[0019] The beneficial effects of adopting the above-mentioned further scheme are: the setting of the piston sealing ring limit plate can ensure that the first plunger pump piston sealing ring does not fall out when the piston moves to the left, while bearing the force of the first plunger pump piston spring; the processing technology of the oil inlet check valve spring seat is difficult, and the structure corresponding to the oil inlet check valve steel ball eliminates the oil inlet check valve spring seat, further simplifies the piston structure, and reduces the piston volume.

[0020] Furthermore, the first plunger pump piston divides the pump chamber into a first pump chamber and a second pump chamber. The first pump chamber is provided with an oil inlet, and the oil enters the second pump chamber through the oil inlet via the oil inlet channel.

[0021] The beneficial effect of adopting the above further solution is that oil can be supplied to the second pump chamber by opening the oil inlet channel, thereby changing the oil inlet method.

[0022] Furthermore, a first plunger rod spring is sleeved on a rod portion of one end of the first plunger rod close to the first plunger pump piston;

[0023] A first plunger pump piston spring is arranged in the second pump cavity.

[0024] The beneficial effects of adopting the above further solution are: the first plunger rod is reset by the first plunger rod spring, and the first plunger pump piston and the first plunger rod are reset as a whole by the first plunger pump piston spring.

[0025] Furthermore, the stiffness of the first plunger rod spring is smaller than the stiffness of the first plunger pump piston spring.

[0026] The beneficial effect of adopting the above-mentioned further scheme is: by setting the stiffness of the first plunger rod spring to be smaller than the stiffness of the first plunger pump piston spring, the oil inlet is closed during the oil discharge stroke, thereby facilitating pressure building; at the same time, during the oil inlet stroke and the oil discharge stroke, the stroke of the first plunger rod is greater than the stroke of the first plunger pump piston, that is, the first plunger rod and the first plunger pump piston move asynchronously, thereby realizing the opening and closing of the oil inlet channel located on the first plunger pump piston.

[0027] Furthermore, the plunger pump further comprises an externally driven first eccentric cam, wherein the first eccentric cam abuts against an end of the first plunger rod away from the first plunger pump piston, and is used for driving the first plunger rod to extend and retract.

[0028] The beneficial effect of adopting the above further solution is that the first eccentric cam serves as a driving mechanism and forms a transmission cooperation with the first plunger rod.

[0029] Furthermore, when the first plunger rod moves to a maximum stroke, the stroke of the first plunger rod is greater than the stroke of the first plunger pump piston, the first plunger rod is separated from the first plunger pump piston, and the oil enters the second pump chamber through the oil inlet and the oil inlet channel;

[0030] When the first plunger rod moves to the minimum stroke, the stroke of the first plunger rod is greater than the stroke of the first plunger pump piston, the first plunger rod is combined with the first plunger pump piston, and the oil in the second pump chamber flows out through the oil outlet.

[0031] The beneficial effect of adopting the above-mentioned further scheme is: on the basis that the stiffness of the first plunger rod spring is less than the stiffness of the first plunger pump piston spring, in the oil discharge stroke, the first plunger rod spring first causes the first plunger rod to move to the right before the first plunger pump piston, and the first plunger rod is combined with the first plunger pump piston to close the oil inlet, thereby facilitating pressure building; the oil inlet one-way valve structure of the traditional plunger pump is eliminated, and the oil inlet one-way valve steel ball is omitted. The first plunger rod cooperates with the first plunger rod spring to separate from the first plunger pump piston during the movement of the first plunger rod to open the oil inlet, so that oil can enter, thereby releasing the closed state of the first plunger pump pump body. During the movement of the piston, negative pressure is generated in the first plunger pump pump body, and the negative pressure sucks in the oil to complete the oil filling operation. The new driving method is used to realize the oil filling operation, and the oil filling effect will be better, while reducing the production cost and weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the utility model;

[0033] Figure 2 It is a schematic diagram of the overall structure of the prior art of the present utility model.

[0034] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0035] 1. First eccentric cam; 2. First plunger rod; 3. First plunger rod guide sleeve; 4. First plunger rod star ring; 5. First plunger rod plastic pad; 6. First plunger pump ring filter; 7. First plunger pump body; 8. First plunger pump plug cover; 9. First oil outlet check valve spring; 10. First oil outlet check valve steel ball; 11. First plunger pump piston spring; 12. Piston seal ring limit plate; 13. First plunger pump piston seal ring; 14. First plunger pump piston; 15. First plunger rod spring; 16. Second eccentric cam; 17. First Second plunger rod; 18. Second plunger rod guide sleeve; 19. Second plunger rod star ring; 20. Second plunger rod plastic pad; 21. Second plunger pump ring filter; 22. Second plunger pump body; 23. Second plunger pump plug cover; 24. Second oil outlet check valve spring; 25. Second oil outlet check valve steel ball; 26. Second plunger pump piston spring; 27. Oil inlet check valve spring seat; 28. Second plunger pump piston seal ring; 29. ​​Second plunger pump piston; 30. Oil inlet check valve spring; 31. Oil inlet check valve steel ball; 32. Plunger pump body. DETAILED DESCRIPTION

[0036] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0037] like Figure 1 As shown, in one embodiment of the present application, a plunger pump structure for line-controlled actuation includes: a plunger pump body 32 and a first plunger rod 2. A pump cavity is formed in the plunger pump body 32. The first plunger rod 2 extends from the pump cavity to the outside of the plunger pump body 32 and can move relative to the plunger pump body 32.

[0038] In this embodiment, the plunger pump body 32 is provided with an oil inlet and an oil outlet. A check valve is installed at the oil outlet, allowing the oil in the pump chamber to flow out through the check valve. Furthermore, a first plunger pump piston 14 is disposed within the pump chamber, and an oil inlet passage is defined therein, communicating with the oil inlet. This passage is opened and closed by the movement of the first plunger rod 2 as it moves between its maximum and minimum strokes.

[0039] like Figure 2 The figure shows the structure of a traditional plunger pump. The oil is introduced into the plunger pump through the oil inlet check valve and flows out of the plunger pump through the oil outlet check valve. The working principle is as follows:

[0040] (1) Oil inlet stroke: Under the elastic force of the second plunger pump piston spring 26, the second plunger pump piston 29 and the second plunger rod 17 move to the left. The stroke of the second plunger rod 17 is equal to that of the second plunger pump piston 29, and negative pressure is generated inside the second plunger pump body 22. Under the action of negative pressure, the oil inlet check valve inside the second plunger pump piston 29 opens, and oil enters the second plunger pump body 22. At this time, the oil outlet check valve remains closed due to the elastic force of the second oil outlet check valve spring 24.

[0041] (2) Oil discharge stroke: Under the action of external drive, the second plunger rod 17 and the second plunger pump piston 29 move to the right, and the stroke of the second plunger rod 17 and the second plunger pump piston 29 are equal. The oil inlet check valve in the second plunger rod 17 remains closed under the action of the oil inlet check valve spring 30; at this time, the pressure inside the second plunger pump body 22 increases, and the oil discharge check valve opens under the action of the internal pressure of the second plunger pump body 22, and the oil flows out of the second plunger pump body 22.

[0042] Specific, definition Figure 2 The first plunger rod 2 moves to the left in the direction close to the first eccentric cam 1. During the oil inlet stroke and the oil outlet stroke, the stroke of the first plunger rod 2 is equal to that of the first plunger pump piston 14, that is, the two move synchronously. The oil can enter or leave the plunger pump through the oil inlet one-way valve or the oil outlet one-way valve provided on the plunger pump.

[0043] Compared to conventional plunger pump structures, the one-way valve body at the oil inlet is eliminated, eliminating the oil inlet one-way valve steel ball 31, further simplifying the plunger pump structure, reducing the size of the first plunger pump piston 14, and reducing production costs and weight. Furthermore, the oil inlet method is changed. Since the oil inlet one-way valve steel ball 31 is omitted, the piston structure is correspondingly simplified, reducing the piston volume. The processing method is changed from stamping to turning. Furthermore, the processing technology and difficulty of the first plunger rod 2 in this application are further simplified, and the processing method is changed from milling to turning, further reducing production costs. Furthermore, the reduction in parts further saves assembly time.

[0044] Specifically, the plunger pump body 32 includes a first plunger rod guide sleeve 3, a first plunger rod star ring 4, a first plunger rod plastic pad 5, a first plunger pump ring filter 6, a first plunger pump pump body 7 and a first plunger pump plug cover 8 which are connected in sequence. The first plunger rod guide sleeve 3, the first plunger rod star ring 4, the first plunger rod plastic pad 5 and the first plunger pump ring filter 6 are all mounted on the first plunger rod 2, and the first plunger rod 2 slides in the first plunger rod guide sleeve 3, the first plunger rod star ring 4, the first plunger rod plastic pad 5 and the first plunger pump ring filter 6.

[0045] The first plunger rod guide sleeve 3, the first plunger rod star ring 4, the first plunger rod plastic pad 5, the first plunger pump annular filter 6, the first plunger pump body 7 and the first plunger pump plug cover 8 are connected in sequence to form a plunger pump main body 32 structure. The first plunger rod guide sleeve 3 can provide precise guidance for the first plunger rod 2, helping the first plunger rod 2 to remain stable during the operation of the plunger pump and prevent the first plunger rod 2 from deflecting or getting stuck; the first plunger rod star ring 4 can play a role in sealing and shock absorption, and at the same time can prevent the first plunger rod 2 from rotating during the operation of the plunger pump, thereby maintaining the normal operation of the plunger pump; the first plunger pump annular filter 6 can protect the interior of the plunger pump from being affected by the external environment, and at the same time can filter out impurities entering the plunger pump to ensure the normal operation of the plunger pump.

[0046] like Figure 1 As shown, a boss is provided on the outer wall of the first plunger pump body 7 protruding outward, and the first plunger pump plug cover 8 is sleeved on the outside of one end of the first plunger pump body 7 and abuts against the boss, thereby realizing the assembly of the first plunger pump plug cover 8 and the first plunger pump body 7.

[0047] Specifically, an oil outlet is provided at one end of the first plunger pump body 7 close to the first plunger pump plug cover 8, and the oil inlet is arranged at the central axis of the first plunger pump body 7. A valve cavity for installing an oil outlet check valve is provided on the first plunger pump plug cover 8 at a position opposite to the oil outlet. The first oil outlet check valve steel ball 10 and the first oil outlet check valve spring 9 are installed in sequence in the valve cavity in the direction away from the oil outlet. The first oil outlet check valve steel ball 10 and the first oil outlet check valve spring 9 constitute an oil outlet check valve.

[0048] In this embodiment, the first plunger pump body 7 and the first plunger pump plug cover 8 are installed in a simple manner, and the oil outlet one-way valve is arranged opposite to the oil outlet. When the internal pressure of the first plunger pump body 7 increases, the oil outlet one-way valve can be opened under the action of the internal pressure of the first plunger pump body 7, allowing the oil to flow out of the first plunger pump body 7.

[0049] The end of the first plunger pump body 7 facing away from the first plunger pump plug cover 8 extends into the first plunger pump annular filter 6 and abuts against the stepped hole in the first plunger pump annular filter 6. In this embodiment, a filter is provided on the outer wall of the step of the first plunger pump annular filter 6 opposite the oil inlet. The inner cavity of the first plunger pump annular filter 6 is a stepped hole structure. When the first plunger pump body 7 is inserted into the first plunger pump annular filter 6, the inner diameter of the first plunger pump body 7 is the same as the inner diameter of the stepped hole in the first plunger pump annular filter 6, providing space for the first plunger pump piston 14 to move.

[0050] The inner cavity of the first plunger pump ring filter 6 is a stepped hole structure, which facilitates installation with the first plunger pump body 7 and improves the sealing performance of the plunger pump.

[0051] like Figure 1As shown, the first plunger pump piston 14 is disposed within the internal cavity enclosed by the first plunger pump annular filter 6 and the first plunger pump body 7, and good sealing is maintained by the first plunger pump piston seal 13 disposed between the first plunger pump piston 14 and the inner wall of the cavity. At the same time, a piston seal limit plate 12 is disposed at the end of the first plunger pump piston 14 and the first plunger pump piston seal 13 facing away from the first plunger rod 2.

[0052] The setting of the piston sealing ring limit plate 12 can ensure that the first plunger pump piston sealing ring 13 does not fall out when the piston moves to the left, while bearing the force of the first plunger pump piston spring 11; the processing technology of the oil inlet check valve spring seat 27 is difficult, and the structure corresponding to the oil inlet check valve steel ball 31 eliminates the oil inlet check valve spring seat 27, further simplifying the piston structure.

[0053] In this embodiment, the first plunger pump piston 14 divides the pump chamber into a first pump chamber and a second pump chamber. Specifically, the first plunger pump piston 14 and the first plunger pump annular filter 6 form a first pump chamber, and the first plunger pump piston 14 and the first plunger pump body 7 form a second pump chamber. An oil inlet is opened on the first pump chamber, and the oil enters the second pump chamber through the oil inlet via the oil inlet channel. By opening the oil inlet channel, oil can be supplied to the second pump chamber, thereby changing the oil inlet method.

[0054] like Figure 1 As shown, the rod portion of the first plunger rod 2 near one end of the first plunger pump piston 14 is sleeved with a first plunger rod spring 15. In this embodiment, the diameter of the first plunger rod 2 where the first plunger rod spring 15 is sleeved becomes smaller, and the first plunger pump piston spring 11 is provided in the second pump chamber, that is, the first plunger pump body 7.

[0055] The first plunger rod 2 is reset by the first plunger rod spring 15 , and the first plunger pump piston 14 and the first plunger rod 2 are reset as a whole by the first plunger pump piston spring 11 .

[0056] like Figure 1 As shown, the stiffness of the first plunger rod spring 15 is smaller than the stiffness of the first plunger pump piston spring 11 .

[0057] By setting the stiffness of the first plunger rod spring 15 to be smaller than the stiffness of the first plunger pump piston spring 11, the oil inlet is closed during the oil discharge stroke to facilitate pressure building; at the same time, during the oil inlet stroke and the oil discharge stroke, the stroke of the first plunger rod 2 is greater than the stroke of the first plunger pump piston 14, that is, the first plunger rod 2 and the first plunger pump piston 14 move asynchronously, thereby realizing the opening and closing of the oil inlet channel on the first plunger pump piston 14.

[0058] In this embodiment, the plunger pump further includes an externally driven first eccentric cam 1, which abuts against the end of the first plunger rod 2 facing away from the first plunger pump piston 14. When the first eccentric cam 1 rotates, the first plunger rod 2 slides relative to the plunger body. When the first eccentric cam 1 is at the proximal end or the distal end, the first plunger rod 2 is at its maximum or minimum stroke, respectively. The first eccentric cam 1 serves as a driving mechanism, forming a transmission engagement with the first plunger rod 2.

[0059] In this embodiment, the oil inlet check valve steel ball 31 is omitted, and the working principle of the plunger pump after the structure is simplified is as follows:

[0060] (1) Oil inlet stroke: Under the elastic force of the first plunger pump piston spring 11, the first plunger pump piston 14 and the first plunger rod 2 move to the left. Since the interior of the first plunger pump body 7 is in a closed state at this time, under the elastic force of the first plunger rod spring 15, the first plunger rod 2 moves to the left before the first plunger pump piston 14, and the stroke of the first plunger rod 2 is greater than the stroke of the first plunger pump piston 14, thereby separating the first plunger rod 2 from the first plunger pump piston 14, and the first plunger pump body 7 is released from the closed state; negative pressure is generated inside the first plunger pump body 7. Under the action of negative pressure, oil enters the first plunger pump body 7, and the oil outlet check valve remains closed under the elastic force of the first oil outlet check valve spring 9.

[0061] (2) Oil discharge stroke: Under the action of external drive, the first plunger rod 2 and the first plunger pump piston 14 move to the right. Since the stiffness of the first plunger rod spring 15 is less than the stiffness of the first plunger pump piston spring 11, the first plunger rod 2 moves to the right before the first plunger pump piston 14, and the stroke of the first plunger rod 2 is greater than the stroke of the first plunger pump piston 14, so that the first plunger rod 2 is engaged with the first plunger pump piston 14, and the first plunger pump body 7 is closed; at this time, the internal pressure of the first plunger pump body 7 increases, and the oil discharge one-way valve opens under the action of the internal pressure of the first plunger pump body 7, and the oil flows out of the first plunger pump body 7.

[0062] Specific, definition Figure 1 The first plunger rod 2 moves in the direction close to the first eccentric cam 1, which is leftward movement. During operation, when the first plunger rod 2 moves to the maximum stroke, the oil inlet stroke is executed. The first plunger rod 2 moves before the first plunger pump piston 14, so that the stroke of the entire first plunger rod 2 is greater than the stroke of the first plunger pump piston 14, thereby achieving separation of the first plunger rod 2 from the first plunger pump piston 14, and the oil enters the second pump chamber through the oil inlet and the oil inlet channel, completing the oil inlet stroke.

[0063] When the first plunger rod 2 moves to the minimum stroke, that is, the oil discharge stroke, the first plunger rod 2 moves before the first plunger pump piston 14, so that the stroke of the first plunger rod 2 is greater than the stroke of the first plunger pump piston 14, thereby realizing the combination of the first plunger rod 2 and the first plunger pump piston 14, the oil inlet channel is closed, and the oil in the second pump chamber flows out through the oil outlet, completing the oil discharge stroke.

[0064] The reciprocating motion continues in this way for the next cycle.

[0065] On the basis that the stiffness of the first plunger rod spring 15 is less than the stiffness of the first plunger pump piston spring 11, in the oil discharge stroke, the first plunger rod spring 15 first causes the first plunger rod 2 to move to the right before the first plunger pump piston 14, and the first plunger rod is combined with the first plunger pump piston 14 to close the oil inlet, thereby facilitating pressure building; the oil inlet one-way valve structure of the traditional plunger pump is eliminated, and the oil inlet one-way valve steel ball 31 is omitted. The first plunger rod 2 cooperates with the first plunger rod spring 15 to separate from the first plunger pump piston 14 during the movement of the first plunger rod 2 to open the oil inlet, so that oil can enter, thereby releasing the closed state of the first plunger pump body 7. During the movement of the piston, negative pressure is generated in the first plunger pump body 7, and the negative pressure sucks in the oil to complete the oil filling operation. The new driving method is used to realize the oil filling operation, which will have a better oil filling effect and reduce the production cost and weight.

[0066] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A plunger pump structure for wire control, characterized in that: include: A plunger pump body (32) and a first plunger rod (2), wherein a pump cavity is formed in the plunger pump body (32), the first plunger rod (2) extends from the pump cavity to the outside of the plunger pump body (32), and a first plunger pump piston (14) is provided in the pump cavity; The plunger pump body (32) is provided with an oil inlet and an oil outlet, and the oil outlet is provided with an oil outlet one-way valve for discharging oil; the first plunger pump piston (14) is provided with an oil inlet channel connected to the oil inlet, and the oil inlet channel is opened and closed by the movement of the first plunger rod (2) piston within the stroke.

2. The plunger pump structure for wire control according to claim 1, characterized in that: The plunger pump body (32) comprises a first plunger rod guide sleeve (3), a first plunger rod star ring (4), a first plunger rod plastic pad (5), a first plunger pump ring filter (6), a first plunger pump body (7) and a first plunger pump plug cover (8) which are sequentially connected.

3. The plunger pump structure for wire control according to claim 2, characterized in that: The first plunger pump plugging cover (8) is sleeved on the outside of one end of the first plunger pump body (7) and abuts against a boss on the outer wall of the first plunger pump body (7); The oil outlet is provided at one end of the first plunger pump body (7) close to the first plunger pump plug cover (8), and a valve cavity opposite to the oil outlet is provided on the first plunger pump plug cover (8). A first oil outlet one-way valve steel ball (10) and a first oil outlet one-way valve spring (9) are sequentially installed in the valve cavity in a direction away from the oil outlet, and the first oil outlet one-way valve steel ball (10) and the first oil outlet one-way valve spring (9) form the oil outlet one-way valve.

4. The plunger pump structure for wire control according to claim 2, characterized in that: One end of the first plunger pump body (7) facing away from the first plunger pump plug cover (8) extends into the first plunger pump ring filter (6) and abuts against the step hole of the first plunger pump ring filter (6).

5. The plunger pump structure for wire control according to claim 2, characterized in that: The first plunger pump piston (14) is arranged in an internal cavity enclosed by the first plunger pump ring filter (6) and the first plunger pump body (7); a first plunger pump piston sealing ring (13) is arranged between the first plunger pump piston (14) and the inner wall of the cavity; and a piston sealing ring limiting plate (12) is arranged at the end of the first plunger pump piston (14) and the first plunger pump piston sealing ring (13) facing away from the first plunger rod (2).

6. The plunger pump structure for wire control according to claim 5, characterized in that: The first plunger pump piston (14) divides the pump chamber into a first pump chamber and a second pump chamber. The first pump chamber is provided with an oil inlet, and the oil enters the second pump chamber through the oil inlet and the oil inlet channel.

7. The plunger pump structure for wire control according to claim 6, characterized in that: A first plunger rod spring (15) is sleeved on a rod portion of the first plunger rod (2) close to one end of the first plunger pump piston (14); A first plunger pump piston spring (11) is arranged in the second pump cavity.

8. The plunger pump structure for wire control according to claim 7, characterized in that: The stiffness of the first plunger rod spring (15) is smaller than the stiffness of the first plunger pump piston spring (11).

9. The plunger pump structure for wire control according to claim 8, characterized in that: The plunger pump further comprises an externally driven first eccentric cam (1), the first eccentric cam (1) abutting against an end of the first plunger rod (2) away from the first plunger pump piston (14), and being used for driving the first plunger rod (2) to extend and retract.

10. The plunger pump structure for wire control according to claim 9, characterized in that: When the first plunger rod (2) moves to the maximum stroke, the stroke of the first plunger rod (2) is greater than the stroke of the first plunger pump piston (14), the first plunger rod (2) is separated from the first plunger pump piston (14), and the oil enters the second pump chamber through the oil inlet and the oil inlet channel; When the first plunger rod (2) moves to the minimum stroke, the stroke of the first plunger rod (2) is greater than the stroke of the first plunger pump piston (14), the first plunger rod (2) is combined with the first plunger pump piston (14), and the oil in the second pump chamber flows out through the oil outlet.

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