Swash plate plunger pump with electric signal flow control function

Abstract

The present invention discloses a swash plate type plunger pump with an electric signal flow control function, comprising: a body (100) and a power control valve (200) installed on the body (100), a function integrated control valve (300) and an electric signal flow control device (400), wherein the electric signal flow control device (400) comprises: a valve body (410) and a valve core (420), wherein the valve body (410) is provided with a mounting interface (411), a valve core hole (412) and a variable cavity (413), and the side of the valve body (410) is provided with a control cavity (414), a high pressure cavity (415) and a variable cavity flow channel (416) in sequence; the valve core (420) is installed in the valve core hole (411), and the valve core (420) is provided with a first control groove (421), a second control groove (422) and a third control groove (423) in sequence. Thus, it is possible to achieve compatibility with other control combinations while performing electric signal flow control on the swash plate type plunger pump.

Description

Technical Field

[0001] The invention relates to the technical field of swash plate type plunger pumps, and in particular to a swash plate type plunger pump with an electric signal flow control function. Background Art

[0002] For the inclined plate piston pump, in order to meet the needs of customers to use electric signals to control flow, some inclined plate piston pumps in the current related technology have an electric signal flow control design structure, for example, the previously applied Chinese patent CN112343806A. However, although it has the electric signal flow control function, its compatibility is low, and it can only realize the function of electric signal flow control alone, and cannot be combined with other control functions (for example, constant power control, load sensitive control, etc.). Summary of the invention

[0003] In order to solve the above-mentioned technical problems, the present invention provides a swash plate type piston pump with an electric signal flow control function. By successively opening a control chamber, a high-pressure chamber and a variable chamber flow channel on the side of the valve body, and correspondingly arranging the first to third control grooves on the valve core, it is possible to achieve electric signal flow control of the swash plate type piston pump while being compatible with other control combinations.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A swash plate plunger pump with an electric signal flow control function, comprising: a body and a power control valve, a function integrated control valve and an electric signal flow control device installed on the body, the electric signal flow control device being connected to the power control valve and the function integrated control valve respectively, wherein the electric signal flow control device comprises: a valve body, wherein a mounting interface, a valve core hole and a variable chamber are provided in the valve body, and a control chamber, a high pressure chamber and a variable chamber flow channel are provided in sequence on the side of the valve body, wherein the valve core hole is connected to the control chamber and the high pressure chamber respectively, the valve core hole is connected to the variable chamber through the variable chamber flow channel, and the control chamber is connected to the function integrated control valve and the electric signal flow control device respectively; a valve core, wherein the valve core is installed in the valve core hole, and a first control groove, a second control groove and a third control groove are provided in sequence on the valve core.

[0006] In one embodiment of the present invention, the swash plate plunger pump with an electrical signal flow control function further includes: a resetting elastic component, wherein the resetting elastic component is installed on a side of the valve core close to the installation interface.

[0007] In one embodiment of the present invention, the swash plate type plunger pump with electric signal flow control function further includes: a feedback elastic component, one end of which is on the side of the valve core away from the mounting interface; a variable block, which is arranged in the variable cavity, and the variable cavity is connected to the other end of the feedback elastic component;

[0008] In one embodiment of the present invention, the inclined plate piston pump with electrical signal flow control function also includes: an electrical signal receiving and conversion element, which is installed on the mounting interface, and is used to convert the received electrical signal into a force, and apply the force to the valve core.

[0009] In one embodiment of the present invention, the distance between the two side edges of the control chamber and the high-pressure chamber that are far away from each other is less than or equal to the distance between the two side edges of the first control groove and the third control groove that are close to each other.

[0010] In one embodiment of the present invention, the resilient return component is a resilient spring.

[0011] In one embodiment of the present invention, the feedback elastic component is a feedback spring, and the electrical signal flow control device further comprises: a spring seat, and the spring seat is a connection carrier between the feedback spring and the valve core.

[0012] In one embodiment of the present invention, the electrical signal flow control device also includes a variable mechanism, the variable mechanism includes a swash plate, a swing block and a limit member, wherein the swash plate is provided with a mounting groove and a limit groove; the swing block is installed in the mounting groove, the swing block is an incomplete sphere with a plane, wherein the swing block is connected to the variable block; the limit member is fixedly installed on the swing block, and the limit member constrains the displacement and swing range of the swing block through the mounting groove and the limit groove.

[0013] In one embodiment of the present invention, the slot area of ​​the mounting slot is smaller than the maximum cross-sectional area of ​​the swing block.

[0014] In one embodiment of the present invention, the limiting member is a fixing member or an elastic member.

[0015] Beneficial effects of the present invention:

[0016] The swash plate type plunger pump with electric signal flow control function of the present invention can realize electric signal flow control of the swash plate type plunger pump while being compatible with other control combinations by sequentially opening a control chamber, a high pressure chamber and a variable chamber flow channel on the side of the valve body and correspondingly arranging first to third control grooves on the valve core.

[0017] Secondly, in the variable mechanism of the inclined plate plunger pump of the present invention, the displacement range of the swing block is limited by wrapping the swing block in the mounting groove, and the displacement range of the swing block is constrained by a limiter, thereby effectively avoiding abnormal flipping of the sliding block. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic structural diagram of a swash plate plunger pump with an electric signal flow control function according to an embodiment of the present invention;

[0019] Figure 2 A hydraulic principle diagram of a swash plate type plunger pump with an electric signal flow control function according to an embodiment of the present invention;

[0020] Figure 3 It is a structural schematic diagram of an electrical signal flow control device according to an embodiment of the present invention;

[0021] Figure 4 This is a schematic structural diagram of a valve body according to an embodiment of the present invention;

[0022] Figure 5 A schematic diagram of the structure of a valve core according to an embodiment of the present invention;

[0023] Figure 6a and 6b The cross-sectional views of an electrical signal flow control device according to an embodiment of the present invention in different directions;

[0024] Figure 7a and 7b are cross-sectional views of an electrical signal flow control device according to another embodiment of the present invention in different directions;

[0025] Figure 8a and 8b The cross-sectional views of an electric signal flow control device according to another embodiment of the present invention in different directions;

[0026] Figure 9a and 9b The cross-sectional views of the electric signal flow control device in different directions according to another embodiment of the present invention are respectively;

[0027] Fig.10 A schematic diagram of the structure of a variable mechanism according to an embodiment of the present invention;

[0028] Fig.11 This is a partial structural diagram of a variable mechanism according to another embodiment of the present invention. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Figure 1 The schematic diagram is a structural diagram of a swash plate plunger pump with an electric signal flow control function according to an embodiment of the present invention.

[0031] like Figure 1 As shown, the swash plate type piston pump with electric signal flow control function of the embodiment of the present invention comprises: a body 100 and a power control valve 200, a function integrated control valve 300 and an electric signal flow control device 400 installed on the body 100, and the electric signal flow control device 400 is connected to the power control valve 200 and the function integrated control valve 300 respectively. The hydraulic principle diagram of the swash plate type piston pump is as shown in FIG. Figure 2 As shown, P represents the high-pressure oil port of the swash plate type piston pump, T1, T2, T3 represent the oil drain ports of the swash plate type piston pump respectively, S represents the low-pressure oil port of the swash plate type piston pump, PR represents the external pilot oil port, and PL represents the external feedback oil port.

[0032] In one embodiment of the present invention, Figure 3 As shown, the electric signal flow control device 400 may include: a valve body 410 and a valve core 420 .

[0033] Among them, Figure 4 As shown, the valve body 410 is provided with an installation interface 411, a valve core hole 412 and a variable cavity 413, and the side of the valve body 410 is provided with a control cavity 414, a high pressure cavity 415 and a variable cavity flow channel 416 in sequence, wherein the valve core hole 412 is communicated with the control cavity 414 and the high pressure cavity 415 respectively, and the valve core hole 412 is communicated with the variable cavity 413 through the variable cavity flow channel 416, and the control cavity 414 is respectively connected to the functional integrated control valve 300 and the electric signal flow control device 400. The valve core 420 is installed in the valve core hole 412, as shown in FIG. Figure 5 As shown, the valve core 420 is provided with a first control groove 421, a second control groove 422 and a third control groove 423 in sequence, wherein the directions in which the first control groove 421, the second control groove 422 and the third control groove 423 are arranged in sequence are opposite to the directions in which the control chamber 414, the high pressure chamber 415 and the variable chamber flow channel 416 are arranged in sequence.

[0034] Therefore, by sequentially opening a control chamber, a high-pressure chamber and a variable chamber flow channel on the side of the valve body, and correspondingly arranging the first to third control grooves on the valve core, it is possible to achieve electrical signal flow control of the inclined plate plunger pump while being compatible with other control combinations.

[0035] In one embodiment of the present invention, Figure 3 As shown, the electrical signal flow control device 400 may further include: a reset elastic component 430 , a feedback elastic component 440 , a variable block 450 and an electrical signal receiving and converting element 460 .

[0036] The reset elastic component 430 is installed on the side of the valve core 420 close to the installation interface 411. One end of the feedback elastic component 440 is on the side of the valve core 420 away from the installation interface 411. The variable block 450 is arranged in the variable cavity 413, and the variable cavity 413 is connected to the other end of the feedback elastic component 440; the electric signal receiving conversion element 460 is installed on the installation interface 411, and the electric signal receiving conversion element 460 is used to convert the received electric signal into a force, and apply the force to the valve core 420.

[0037] In one embodiment of the present invention, the reset elastic component 430 may be a reset spring, and the feedback elastic component 440 may be a feedback spring, such as Figure 3 As shown, the electric signal flow control device 400 further includes: a spring seat 470 , which can be a connection carrier between the feedback spring and the valve core 420 .

[0038] It can be understood that the control oil of the function integrated control valve 300 and the high pressure oil at the outlet of the swash plate type plunger pump body 100 can flow into the control chamber 414 and the high pressure chamber 415 of the valve body 410 through the flow passage of the body 100. When the electric signal flow control device 400 is in operation, the installation interface 411 can communicate with the control chamber 414 and the high pressure chamber 415 through the internal flow passage of the valve body 410.

[0039] It should be noted that the electrical signal receiving and conversion element 460 includes a storage unit, which stores a correspondence table between electrical signals and pump displacement. When the user performs electrical signal flow control on the swash plate plunger pump, the user can call and refer to the correspondence table and input the corresponding electrical signal according to the actual pump displacement requirement. When the electrical signal receiving and conversion element 460 receives the electrical signal input by the user, it converts the electrical signal into a corresponding force, which acts on the valve core 420 to control the movement of the valve core 420. The following describes in detail how the electrical signal receiving and conversion element 460 controls the movement of the valve core 420 to achieve the flow control function.

[0040] Specifically, in one embodiment of the present invention, when the electric signal flow control device 400 is weakened and the control of the power control valve 200 and the function integrated control valve 300 is not effective, as shown in FIG. Figure 6a and 6b As shown, the output force of the electrical signal receiving conversion element 460 decreases, and the valve core 420 moves right under the joint action of the feedback spring and the return spring, the control chamber 414 is closed, and the first control groove 421 connects the high-pressure chamber 415 and the variable chamber flow channel 416, so that the pump high-pressure port oil introduced into the high-pressure chamber 415 through the flow channel of the main body 100 enters the variable chamber 413 to push the variable block 450 to move left, driving the variable mechanism 480 to reduce the displacement of the main body 100, and at the same time, the compression of the feedback spring decreases, and the valve core 420 gradually moves left to hinder the connection between the high-pressure chamber 415 and the first control groove 421, until the output force of the electrical signal receiving conversion element 460 is balanced with the joint force of the feedback spring and the return spring, the pressure in the variable chamber 413 is stable, the variable block 450 stops moving, and the displacement of the main body 100 reaches the displacement required by the electrical signal control.

[0041] When the control of the power control valve 200 and the function integrated control valve 300 is effective and participates in the control (for example, load sensing control, pressure cut-off control, constant power control, electric proportional pressure control, etc.), as shown in FIG. Figure 7a and 7b As shown, the control oil generated by other controls that are introduced into the control chamber 414 through the flow channels of the main body 100 enters the control chamber 414 through the second control groove 422 and the internal flow channel of the valve core 420 under the obstruction of the feedback spring and the spring seat 470, pushing the variable block 450 to move left to reduce the displacement of the main body 100 until it reaches the minimum displacement among the required displacements of one or more other controls. At this time, the control oil is reduced, the pressure in the variable chamber 413 is stable, and the variable block 450 stops moving.

[0042] In another embodiment of the present invention, when the electric signal flow control device 400 is intensified and the control of the power control valve 200 and the function integrated control valve 300 is not effective, as shown in FIG. Figure 8a and 8bAs shown, the output force of the electric signal receiving conversion element 460 increases, so that the valve core 420 moves to the left to resist the feedback spring and the return spring, the degree of obstruction of the communication between the high-pressure chamber 415 and the first control groove 421 is aggravated or even blocked, and the third control groove 423 is connected to the control chamber 414 and the variable chamber 413 through the internal flow channel of the valve body 410, so that the pressure oil in the variable chamber 413 is discharged through the control chamber 414, and the pressure of the variable chamber 413 decreases. The variable block 450 moves rightward to drive the variable mechanism 480 to increase the displacement of the body 100. At the same time, the compression amount of the feedback spring increases, and the valve core 420 gradually moves rightward to hinder the communication between the third control groove 423 and the control chamber 414. At the same time, the degree of obstruction of the communication between the high-pressure chamber 415 and the first control groove 421 is reduced until the output force of the electric signal receiving conversion element 460 is balanced with the combined force of the feedback spring and the return spring, the pressure in the variable chamber 413 is stable, the variable block 450 stops moving, and the displacement of the body 100 reaches the displacement required by the electric signal control.

[0043] When the control of the power control valve 200 and the function integrated control valve 300 takes effect and participates in the control, such as Figure 9a and 9b As shown, the control oil generated by the other controls introduced into the control chamber 414 through the flow channel of the main body 100 hinders the variable chamber pressure oil leaking out through the third control groove 423 and is forced to flow back into the variable chamber 413, so that the pressure of the variable chamber 413 is restored or even increased, pushing the variable block 450 to move left to reduce the displacement of the main body 100 until it reaches the minimum displacement among the required displacements of one or more other controls. At this time, the control oil is reduced, the pressure in the variable chamber 413 is stable, and the variable block 450 stops moving.

[0044] Thus, the received electrical signal is converted into a corresponding force through the electrical signal receiving and conversion element, and acts on the valve core to control the action of the valve core. When the valve core is in action, the first to third control grooves arranged on the valve core cooperate with the control chamber, high-pressure chamber and variable chamber flow channel opened in sequence on the side of the valve body. While meeting the different pump displacement requirements of users, different control combinations (for example, constant power control, load sensitive control, etc.) can be compatible, which greatly meets the different application scenario requirements of customers. At the same time, the inclined disk plunger pump of the present invention has a simple structure, is stable and reliable, is easy to process and assemble, and effectively reduces costs.

[0045] It is understandable that as the use time of the feedback spring increases, the elastic force it generates will also change. Therefore, in actual application, the correspondence table between the electrical signal stored in the storage unit and the pump displacement will also deviate.

[0046] Therefore, in one embodiment of the present invention, the storage unit is also used to obtain the usage time, historical number of actions and material of the feedback spring, and calculate the loss coefficient of the feedback spring based on the usage time, historical number of actions and material, and update the correspondence table between the electrical signal and the pump displacement stored in the storage unit based on the loss coefficient.

[0047] Specifically, first, the time from when the feedback spring was put into use to the current use time can be divided into multiple time periods, and a different first weight can be assigned to each time period, and the number of historical actions of the feedback spring in each time period can be obtained. Secondly, the material grade of the feedback spring can be obtained according to the material of the feedback spring, wherein springs of different materials can correspond to different material grades. For example, the material of the spring may include carbon steel, alloy steel, stainless steel, nickel alloy, titanium alloy, chrome silicon alloy, polymer spring material, titanium nickel shape memory alloy, composite spring, etc. Different material grades can be set for the spring quality corresponding to each material in the current application environment, wherein the better the spring quality corresponding to each material in the current application environment, the higher the corresponding material grade. Then, the loss coefficient of the feedback spring is calculated by the following formula:

[0048] ,

[0049] in, is the loss coefficient, is the second weight, , and are all constants greater than 0. For the duration of use, is the third weight, is the fourth weight, is a constant greater than 1, is the material grade, is the historical number of actions of the feedback spring in the i-th time period, is the first weight assigned to the i-th time period, is the number of divided time periods, is the adjustment coefficient.

[0050] After calculating the loss coefficient of the feedback spring, the loss coefficient can be added with 1 and multiplied by the input current value corresponding to the electrical signal in the corresponding relationship table, and the calculation result is the input current value in the updated corresponding relationship table.

[0051] Thus, the correspondence table between the electrical signal and the pump displacement stored in the storage unit can be updated according to the actual application of the feedback spring, so that the pump displacement of the swash plate type piston pump can be controlled more accurately.

[0052] In one embodiment of the present invention, Figure 3As shown, the electrical signal flow control device 400 may further include a variable mechanism 480 .

[0053] like Fig.10 As shown, the variable mechanism 480 includes a swash plate 481, a swing block 482 and a limit member 483, wherein the swash plate 481 is provided with a mounting groove 4811 and a limit groove 4812; the swing block 482 is installed in the mounting groove 4811, and the swing block 482 is an incomplete sphere with a plane, wherein the swing block 482 is connected to the variable block 450; the limit member 483 is fixedly installed on the swing block 482, and the limit member 483 constrains the displacement and swing range of the swing block 482 through the mounting groove 4811 and the limit groove 4812.

[0054] The slot area of ​​the installation slot 4811 is smaller than the maximum cross-sectional area of ​​the swing block 482, and the swing block 482 can be wrapped and accommodated in the installation slot 4811 by pressing or knocking, and is limited by the interference design of the slot, thereby limiting the displacement range of the swing block 482. The limit slot 4812 can limit the swing range of the swing block 482, and can be designed to be spherical, conical, cylindrical, etc. The principle is that when the swing block 482 swings to the maximum range, the limit member 483 fixed thereon will contact the limit slot 4812 for limiting.

[0055] The limiting member 483 may be a fixing member (eg, a pin, a screw, etc.), or may be an elastic member (eg, an elastic retaining spring, etc.). Fig.11 As shown, the limiter 483 may be an elastic retaining spring, which, in addition to limiting the swing angle of the swing block 482, also has a buffering effect on the swing block 482 and makes the swing angle of the swing block 482 tend to decrease, thereby further protecting the swing block.

[0056] Therefore, the present invention can effectively avoid abnormal flipping of the sliding block by wrapping and accommodating the swing block in the installation groove to limit the displacement range of the swing block, and constraining the displacement range of the swing block by the limiter.

[0057] In summary, according to an embodiment of the present invention, a swash plate type plunger pump with an electric signal flow control function comprises: a body and a power control valve, a function integrated control valve and an electric signal flow control device installed on the body, the electric signal flow control device being connected to the power control valve and the function integrated control valve respectively, wherein the electric signal flow control device comprises: a valve body and a valve core, the valve body is provided with an installation interface, a valve core hole and a variable cavity, the side of the valve body is provided with a control cavity, a high pressure cavity and a variable cavity flow channel in sequence, wherein the valve core hole is communicated with the control cavity and the high pressure cavity respectively, the control cavity is connected with the function integrated control valve and the electric signal flow control device respectively, and the valve core hole is communicated with the variable cavity through the variable cavity flow channel. The valve core is installed in the valve core hole, and the valve core is provided with a first control groove, a second control groove and a third control groove in sequence, wherein the first control groove, the second control groove and the third control groove are provided in sequence in a direction opposite to the direction in which the control cavity, the high pressure cavity and the variable cavity flow channel are provided in sequence. Therefore, by sequentially opening a control chamber, a high-pressure chamber and a variable chamber flow channel on the side of the valve body, and correspondingly arranging the first to third control grooves on the valve core, it is possible to achieve electrical signal flow control of the inclined plate plunger pump while being compatible with other control combinations.

[0058] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0059] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0061] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0062] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A swash plate plunger pump with electric signal flow control function, characterized in that: include: A body (100), and a power control valve (200), a function integrated control valve (300), and an electric signal flow control device (400) installed on the body (100), wherein the electric signal flow control device (400) is connected to the power control valve (200) and the function integrated control valve (300), respectively, wherein the electric signal flow control device (400) comprises: A valve body (410), wherein a mounting interface (411), a valve core hole (412) and a variable chamber (413) are provided in the valve body (410), and a control chamber (414), a high-pressure chamber (415) and a variable chamber flow channel (416) are provided in sequence on the side of the valve body (410), wherein the valve core hole (412) is communicated with the control chamber (414) and the high-pressure chamber (415) respectively, the valve core hole (412) is communicated with the variable chamber (413) through the variable chamber flow channel (416), and the control chamber (414) is connected with the functional integrated control valve (300) and the electrical signal flow control device (400) respectively; A valve core (420), the valve core (420) is installed in the valve core hole (412), and a first control groove (421), a second control groove (422), and a third control groove (423) are sequentially arranged on the valve core (420), and the first control groove (421), the second control groove (422), and the third control groove (423) are sequentially arranged in a direction opposite to the direction in which the control chamber (414), the high-pressure chamber (415), and the variable chamber flow channel (416) are sequentially arranged; wherein the The swash plate plunger pump further comprises: a feedback elastic component (440), a reset elastic component (430) and an electrical signal receiving conversion element (460), wherein the feedback elastic component (440) is a feedback spring, the reset elastic component (430) is a reset spring, and the electrical signal receiving conversion element (460) is mounted on the mounting interface (411), and the electrical signal receiving conversion element (460) is used to convert a received electrical signal into an action force, and to apply the action force to the valve core (420); wherein: When the electric signal of the electric signal flow control device (400) weakens and the control of the power control valve (200) and the function integrated control valve (300) is not effective, the output force of the electric signal receiving conversion element (460) decreases, and the valve core (420) moves rightward under the joint action of the feedback spring and the return spring, the control chamber (414) is closed, and the first control groove (421) connects the high-pressure chamber (415) and the variable chamber flow channel (416), so that the pump high-pressure port oil introduced into the high-pressure chamber (415) by the body (100) through the flow channel enters the variable chamber (413) and pushes the variable block (450) to move leftward, driving the variable mechanism (480) to reduce the displacement of the body (100), and at the same time, the compression amount of the feedback spring decreases, and the valve core (420) gradually moves leftward to hinder the communication between the high-pressure chamber (415) and the first control groove (421), until the output force of the electric signal receiving conversion element (460) and the feedback spring and the return spring are combined to close. The same force is balanced, the pressure in the variable chamber (413) is stable, the variable block (450) stops moving, and the displacement of the body (100) reaches the required displacement controlled by the electrical signal; wherein, when the control of the power control valve (200) and the function integrated control valve (300) takes effect and participates in the control, the control oil generated by the effective control of the power control valve (200) and the function integrated control valve (300) introduced into the control chamber (414) through the confluence of the flow channels of the body (100) enters the control chamber (414) through the second control groove (422) and the flow channel inside the valve core (420) under the obstruction of the feedback spring and the spring seat (470), pushing the variable block (450) to move leftward so that the displacement of the body (100) decreases until it reaches the minimum displacement among the required displacements of one or more controls of the power control valve (200) and the function integrated control valve (300), at which time the control oil decreases, the pressure in the variable chamber (413) is stable, and the variable block (450) stops moving; When the electric signal of the electric signal flow control device (400) is enhanced and the control of the power control valve (200) and the function integrated control valve (300) is not effective, the output force of the electric signal receiving conversion element (460) increases, so that the valve core (420) moves leftward to resist the feedback spring and the return spring, and the degree of obstruction of the communication between the high-pressure chamber (415) and the first control groove (421) is aggravated or the communication is blocked, and the third control groove (423) is connected to the control chamber (414) through the internal flow channel of the valve body (410). and the variable chamber (413), so that the pressure oil in the variable chamber (413) is discharged through the control chamber (414), the pressure of the variable chamber (413) decreases, the variable block (450) moves rightward, driving the variable mechanism (480) to increase the displacement of the body (100), and at the same time, the compression amount of the feedback spring increases, and the valve core (420) gradually moves rightward to hinder the communication between the third control groove (423) and the control chamber (414), and at the same time, the degree of obstruction of the communication between the high-pressure chamber (415) and the first control groove (421) decreases until the electrical signal The output force of the receiving conversion element (460) is balanced with the combined force of the feedback spring and the return spring, the pressure in the variable chamber (413) is stabilized, the variable block (450) stops moving, and the displacement of the body (100) reaches the displacement required by the electrical signal control; wherein, when the control of the power control valve (200) and the function integrated control valve (300) takes effect and participates in the control, the control generation of the power control valve (200) and the function integrated control valve (300) introduced into the control chamber (414) through the confluence of the flow channels of the body (100) is The control oil generated by the effect blocks the variable chamber pressure oil leaking through the third control groove (423) and flows back into the variable chamber (413), so that the pressure of the variable chamber (413) is restored or increased, and the variable block (450) is pushed to move leftward so that the displacement of the body (100) decreases until the minimum displacement among the required displacements of one or more controls of the power control valve (200) and the function integrated control valve (300) is reached, the control oil is reduced, the pressure in the variable chamber (413) is stabilized, and the variable block (450) stops moving; The electric signal flow control device (400) further comprises: a variable block (450) and a variable mechanism (480), wherein the variable block (450) is arranged in the variable cavity (413), and the variable mechanism (480) comprises a swash plate (481), a swing block (482) and a limiter (483), wherein the swash plate (481) is provided with a mounting groove (4811) and a limiter groove (4812); the swing block (482) is mounted in the mounting groove (4811) and the limiter groove (4812) is provided with a swing block (482) and a limiter groove (483). The swing block (482) is an incomplete sphere with a plane, wherein the swing block (482) is connected to the variable block (450); a limit member (483) is fixedly mounted on the swing block (482), and the limit member (483) constrains the displacement and swing range of the swing block (482) through the mounting groove (4811) and the limit groove (4812), and the notch area of ​​the mounting groove (4811) is smaller than the maximum cross-sectional area of ​​the swing block (482).

2. The swash plate type plunger pump with electric signal flow control function according to claim 1, characterized in that: The distance between the two side edges of the control chamber (414) and the high-pressure chamber (415) that are far away from each other is less than or equal to the distance between the two side edges of the first control groove (421) and the third control groove (423) that are close to each other.

3. The swash plate type plunger pump with electric signal flow control function according to claim 1, characterized in that: The resetting elastic component (430) is installed on a side of the valve core (420) close to the installation interface (411).

4. The swash plate type plunger pump with electric signal flow control function according to claim 1, characterized in that: One end of the feedback elastic component (440) is located on a side of the valve core (420) away from the mounting interface (411); The variable cavity (413) is connected to the other end of the feedback elastic component (440).

5. The swash plate type plunger pump with electric signal flow control function according to claim 4, characterized in that: The electric signal receiving and converting element (460) comprises a storage unit, wherein a correspondence table between electric signals and pump displacement is stored in the storage unit. When a user performs electric signal flow control on the swash plate piston pump, the user calls and refers to the correspondence table, and inputs a corresponding electric signal according to an actual pump displacement requirement. The storage unit is further used to obtain the service life, historical number of actions and material of the feedback spring, calculate the loss coefficient of the feedback spring according to the service life, historical number of actions and material, and update the correspondence table between electric signals and pump displacement stored in the storage unit according to the loss coefficient.

6. The swash plate type plunger pump with electric signal flow control function according to claim 5, characterized in that: The electrical signal flow control device (400) further comprises: A spring seat (470), the spring seat (470) being a connection carrier between the feedback spring and the valve core (420).

7. The swash plate type plunger pump with electric signal flow control function according to claim 1, characterized in that: The limiting member (483) is a fixing member or an elastic member.

Images