Integrated high-pressure pump with interchangeable flow rate

Abstract

The present invention relates to a flow-changeable integrated high-pressure pump, which includes a valve body, a drive shaft, an eccentric wheel, and a plunger pump. Six flow passages are evenly designed near the bottom of the valve body around the periphery, and nine threaded oil ports are designed around the valve body. A plunger pump is installed at the corresponding six flow passages at the lower end of the valve body; six vertical flow passages are designed above the six flow passages, two of which are symmetrically arranged with the center of the valve body and serve as vertical low-pressure flow passages, and the remaining four vertical flow passages are also symmetrically arranged with the center of the valve body and serve as vertical high-pressure flow passages; an upper flow passage is designed near the upper end of the valve body, and a lower flow passage is designed near the middle position of the valve body. The advantage is that the overall design structure is small and compact, and when in use, it can be installed inside the oil tank of a mobile pump station without being installed outside the oil tank, saving installation space, reducing the volume of the pump station, and facilitating the movement of the pump station. At the same time, it can operate at high pressure, without leakage, and is safe and reliable.

Description

Technical Field

[0001] The invention relates to the field of high-pressure pumps, and in particular to an integrated high-pressure pump with changeable flow rate. Background Art

[0002] The radial piston 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 plunger pump has the advantages of high rated pressure, compact structure, and high efficiency. It is widely used in high pressure, large flow and flow adjustment occasions, such as hydraulic presses, machine tool fixtures, compact hydraulic tools, engineering machinery and ships. However, there are technical problems with the current plunger pump. The pressure is controlled in a single stage, the volume is large, the motor power cannot be fully utilized, the working conditions are met, and the flow rate is difficult to change. When some radial piston pumps are used, when two-stage pressure regulation is required, each plunger pump is used in multi-stage series. The series connection method mostly uses external pipes in series, and one eccentric shaft drives multiple plunger pumps. This requires that the plunger pump volume cannot be too large. If it is too large, multiple installations cannot be used together, and there is no installation space. Now it is necessary to develop a plunger pump with a smaller volume and sufficient pressure. Summary of the invention

[0003] In order to solve the above technical problems, the present invention proposes an integrated high-pressure pump with interchangeable flow rate, which has ingenious design, reasonable and compact structure, small size and sufficient pressure.

[0004] The technical solution of the present invention:

[0005] The integrated high-pressure pump with interchangeable flow rate comprises a valve body, a drive shaft, an eccentric wheel and a plunger pump. The valve body is arranged as a cylinder with an axial hole in the middle. The drive shaft is rotatably mounted in the axial hole through a bearing. The lower end of the drive shaft passes through the axial hole and is mounted with an eccentric wheel.

[0006] Six flow passages are evenly designed near the bottom of the valve body, and nine threaded oil ports are designed around the valve body. The nine threaded oil ports are divided into two rows, the upper row is provided with five threaded oil ports, and the lower row is provided with four threaded oil ports. A plunger pump is respectively installed at the position corresponding to the six flow passages at the lower end of the valve body; the inner side of each plunger pump is respectively in contact with the outer side of the eccentric wheel;

[0007] Six vertical flow channels are designed on the six flow channel openings, two of which are symmetrically arranged with respect to the center of the valve body and serve as vertical low-pressure flow channels, and the remaining four vertical flow channels are also symmetrically arranged with respect to the center of the valve body and serve as vertical high-pressure flow channels;

[0008] The upper flow channel is designed near the upper end of the valve body, and the lower flow channel is designed near the middle of the valve body.

[0009] The upper flow channel includes a first flow channel, a second flow channel, a third flow channel, a fourth flow channel and a pressure relief flow channel. The first flow channel and the second flow channel are arranged in parallel in the valve body. The inner end of the first flow channel is connected to the upper end of one of the vertical low-pressure flow channels, and the other end of the first flow channel is connected to one of the five threaded oil ports in the upper row on the outside of the valve body, and a threaded plug is installed in the threaded oil port. The inner end of the fourth flow channel is vertically connected to the inner end of the second flow channel, and the other end of the fourth flow channel is connected to the upper end of another vertical low-pressure flow channel. The outer end of the fourth flow channel is connected to one of the five threaded oil ports, and a threaded plug is installed in the threaded oil port; the other end of the second flow channel The first end is connected to one of the five threaded oil ports in the upper row on the outside of the valve body, and a threaded plug is installed in the threaded oil port. The first flow channel and the second flow channel are connected by a third flow channel near the outer threaded oil port. Any end of the third flow channel passes through the first flow channel or the second flow channel and is connected to one of the five threaded oil ports, and a threaded plug is installed in the threaded oil port. A pressure relief flow channel is arranged on the outside of the inner end of the first flow channel, the first flow channel and the pressure relief flow channel are perpendicular to each other but not connected, a pressure relief vertical flow channel is arranged below the inner end of the pressure relief flow channel, the outer side of the pressure relief flow channel is connected to one of the five threaded oil ports, and the threaded oil port forms a pressure relief port.

[0010] The lower flow channel includes a fifth flow channel, a sixth flow channel, an outlet flow channel, and a pressure relief valve flow channel. The fifth flow channel and the sixth flow channel are arranged in parallel with each other. One end of the fifth flow channel is connected to the upper end of a vertical high-pressure flow channel, and one end of the sixth flow channel is connected to the upper end of a vertical high-pressure flow channel. The other end of the fifth flow channel is connected to the upper end of a vertical high-pressure flow channel and is also connected to one of the four threaded oil ports in the lower row, and a threaded plug is installed in the threaded oil port; the other end of the sixth flow channel is connected to the upper end of a vertical high-pressure flow channel and is also connected to one of the four threaded oil ports in the lower row, and a threaded plug is installed in the threaded oil port. There is a safety valve; the two ends of the outlet flow channel are connected to the fifth flow channel and the sixth flow channel, and one end of the outlet flow channel is connected to one of the four threaded oil ports in the lower row, and an outlet joint is installed in the threaded oil port; the inner end of the pressure relief valve flow channel is vertically connected to the middle position of one side of the sixth flow channel, and the outer end of the pressure relief valve flow channel is connected to one of the four threaded oil ports in the lower row, and a pressure relief valve is installed in the threaded oil port; the middle of the pressure relief valve flow channel is connected to the middle position of one of the vertical low-pressure flow channels, which is also the inlet of the pressure relief valve, and the lower end of the pressure relief vertical flow channel is connected to the upper end of the pressure relief valve flow channel, which is also the outlet of the pressure relief valve;

[0011] The third flow channel is connected to the outlet flow channel in upper and lower parts through a seventh flow channel, and the lower end of the seventh flow channel is connected to the lower end surface of the valve body;

[0012] A one-way valve is also installed in the seventh flow channel, and the lower end of the seventh flow channel is blocked by the one-way valve.

[0013] A threaded hole is installed on both sides of each flow channel opening, and a bolt hole is also designed on both sides of the plunger pump. The two sides of the plunger pump are respectively locked in the threaded holes after the screws pass through the bolt holes, and the outlet of the plunger pump is sealed and matched with the corresponding flow channel opening; the adjacent plunger pumps are connected and fixed by a connecting plate, and a through hole is designed at both ends of the connecting plate. One end of the connecting plate is sleeved on the screw of a plunger pump through the through hole and the end of the connecting plate is pressed under the plunger pump, and the other end of the connecting plate is also sleeved on the screw of the adjacent plunger pump through the through hole and the end of the connecting plate is pressed under the plunger pump.

[0014] The pressure relief valve comprises a pressure relief valve body, a pressure relief spring, a pressure relief valve core and a sealing ring. The pressure relief valve flow channel comprises a large cylindrical flow channel, a medium cylindrical flow channel and a small cylindrical flow channel. The outer side of the large cylindrical flow channel is connected to the outer peripheral surface of the valve body, the inner side of the large cylindrical flow channel is connected to the outer side of the medium cylindrical flow channel, the inner side of the medium cylindrical flow channel is connected to the outer side of the small cylindrical flow channel, and the inner side of the small cylindrical flow channel is connected to the middle position of one side of the sixth flow channel. The pressure relief valve body is designed to be cylindrical, the outer end of the pressure relief valve body is designed to be hexagonal, a circular groove is provided in the middle of the inner end of the pressure relief valve body, the outer periphery of the pressure relief valve body is provided with an external thread near the inner end, the large cylindrical flow channel is designed with an internal thread, and the pressure relief valve core comprises a large cylinder, a cone and A small cylinder, one end of the large cylinder is connected to the large end of the cone, the small end of the cone is connected to one end of the small cylinder, a pressure relief spring is sleeved on the outside of the large cylinder, the other end of the small cylinder is inserted into the middle cylindrical flow channel and the other end of the small cylinder is designed with an annular groove, a sealing ring is sleeved in the annular groove, the small end of the cone is sealed and pressed against the outer mouth of the middle cylindrical flow channel, the pressure relief valve body is rotatably installed in the large cylindrical flow channel and the pressure relief valve body is sleeved on the outside of the pressure relief spring, one end of the pressure relief spring is against the bottom of the circular groove of the pressure relief valve body, and the other end of the pressure relief spring is against the outside of the large end of the cone; the lower end of the pressure relief vertical flow channel is connected to the upper position near the bottom of the large cylindrical flow channel, and the middle of one of the vertical low-pressure flow channels is connected to the position near the outer end of the middle cylindrical flow channel.

[0015] The plunger pump comprises a pump body, a plunger rod, a spring, a plunger head, an oil suction valve group and an oil discharge valve group. The pump body is designed as a rectangular valve block. A pump chamber that runs through the front and back is horizontally designed in the middle of the pump body. An annular protrusion is designed on the outer side of one end of the pump chamber. The pump chamber is connected to the middle hole of the annular protrusion. An oil suction valve group is installed on the inner side of the other end portion of the pump chamber. An oil discharge channel is designed in the middle of the upper end of the pump body. The lower end of the oil discharge channel is connected to the pump chamber, and the upper end of the oil discharge channel is connected to the upper end face of the pump body. An oil discharge valve group is installed on the inner side of the outlet of the oil discharge channel. A plunger head is installed at one end of the plunger rod, and the other end of the plunger rod is slidingly sealed in the middle hole of the annular protrusion and the front hole of the pump chamber. The spring is sleeved on the outer side of the annular protrusion, and one end of the spring is pressed against the inner side of the plunger head, and the other end of the spring is pressed against the outer side of the pump body. A filter is designed on the external oil inlet side of the oil suction valve group.

[0016] The annular protrusion is designed as an annular conical cylinder, and the annular conical cylinder is designed to be thin on the outside and thick at the root; the spring is designed as a conical cylindrical spring, the end of the spring with a thick diameter is sleeved on the outside of the root of the annular conical cylinder and the end is pressed against the outer side of the pump body, and the end of the spring with a thin diameter is sleeved on the outside of the plunger rod and the end is pressed against the inner side of the plunger head.

[0017] The inner diameter of the middle hole inside the annular protrusion is designed to be 6-16mm; a bolt hole is designed on both sides of the pump body, the two bolt holes are located on both sides of the pump cavity and are parallel to the oil outlet channel, an annular step is designed on the inner side of the oil outlet channel mouth, and a sealing ring is designed and installed inside the annular step.

[0018] The oil suction valve group comprises an oil suction valve body, an oil suction valve plate, and a circular baffle with a hole. The inlet and outlet sides of the pump chamber are internally designed with a first circular groove for installing the oil suction valve body of the oil suction valve group, the inner side of the circular groove is designed with an internal thread, the oil suction valve body is designed as a cylinder, the outer side of the oil suction valve body is designed with an external thread, the middle of the oil suction valve body is designed with an oil inlet through hole, the oil outlet side of the oil inlet through hole is internally designed with a first annular groove, and a second annular groove is also designed on the outer side of the first annular groove, the inner diameter of the second annular groove is larger than the first annular groove, and the inner diameter of the first annular groove is larger than the oil inlet through hole; the oil suction valve plate is slidably installed in the first annular groove, the circular baffle with a hole is installed in the second annular groove, and the circular baffle with a hole blocks the first annular groove. shaped groove outside, the oil suction valve body is rotatably installed in the first circular groove through threaded cooperation, and the root end face of the first annular groove is sealed with the oil suction valve plate; a plurality of semicircular grooves are designed on the inner circumferential wall of the first annular groove, and the ends of the semicircular grooves are correspondingly connected with the circular holes on the circular baffle with holes; the oil suction valve group also includes an oil suction conical spring, and an annular groove is designed on the inner side of the root end face of the first annular groove, the oil suction conical spring support is installed in the first annular groove, and the thin end of the oil suction conical spring is against one side of the oil suction valve plate, and the other end of the oil suction conical spring is against the inner side of the circular baffle with holes; the oil inlet side end face of the oil suction valve body is designed with a cross-shaped groove or a plum blossom-shaped groove.

[0019] The oil outlet valve group includes an oil outlet valve body, an oil outlet valve plate, and an annular valve seat. The inner side of the outlet of the oil outlet flow channel of the pump body is designed with a second circular groove for installing the oil outlet valve body of the oil outlet valve group. The oil outlet valve body is designed as a cylinder. A first circular groove is designed in the middle of the oil outlet valve body. A second circular groove is designed at the lower end of the first circular groove. The inner diameter of the second circular groove is larger than the first circular groove. The lower end of the second circular groove is connected to the lower end surface of the oil outlet valve body. A plurality of arc-shaped grooves are designed around the upper end of the oil outlet valve body. The upper end of the arc-shaped groove is connected to the upper end surface of the oil outlet valve body, and the bottom of the arc-shaped groove is connected to the upper end of the first circular groove. The annular valve seat is installed In the second circular groove, the inner diameter of the annular valve seat is smaller than that of the first circular groove, and the oil outlet valve plate is slidably installed in the first circular groove, and the end face of the oil outlet valve plate is sealed with the upper end face of the annular valve seat; the oil outlet valve group also includes an oil outlet conical spring, and an annular protrusion is designed on the upper end of the annular valve seat, the annular protrusion extends into the first circular groove for a distance and an annular groove is formed between the annular protrusion and the first circular groove, the oil outlet conical spring is located in the first circular groove, the thin end of the oil outlet conical spring is pressed against the oil outlet valve plate, and the thick end of the oil outlet conical spring is pressed against the bottom of the first circular groove; the lower end face of the oil outlet valve plate is sealed with the upper end face of the annular protrusion.

[0020] The outer side of the oil outlet valve body is designed with an external thread, the inner side of the second circular groove of the pump body is designed with an internal thread, and the oil outlet valve body is installed in the second circular groove of the pump body through threaded matching.

[0021] The filter is designed as a basin-shaped filter, and the basin-shaped filter cover is outside the oil inlet side of the oil suction valve group. The basin-shaped filter cover is fixed to the outside of the pump body by a pressure plate. The pressure plate is designed as a rectangular plate. A circular hole is opened in the middle of the rectangular plate. Bolt holes are designed at the four corners of the rectangular plate. Threaded holes are designed on the outside of the pump body corresponding to the bolt holes. The rectangular plate is sleeved on the outside of the basin-shaped filter cover through the circular holes and the rectangular plate is pressed on the annular flange of the basin-shaped filter cover. The four corners of the rectangular plate are locked in the threaded holes on the outside of the pump body by screws passing through the bolt holes.

[0022] The advantages of the present invention are:

[0023] 1. The valve body is designed with several flow channels and corresponding threaded oil ports around it for installing the pressure relief valve, safety valve, check valve and outlet joint. The integrated design has compact structure, small size and convenient installation, and can realize high and low pressure flow regulation and pressure regulation. Several flow channels are designed in the valve body to omit the external series pipes and integrate them inside the valve body, which is safer and more reliable, leak-free and can withstand higher pressure. At the same time, the six plunger pumps are divided into 4 high-pressure plunger pumps in series and 2 low-pressure plunger pumps in series. The high-pressure system and the low-pressure system are connected through a check valve, and the pressure relief valve and the safety valve are used for pressure regulation to realize the automatic conversion of low-pressure and high-flow oil supply and high-pressure and low-flow oil supply, which is safe and reliable.

[0024] 2. The design of the plunger pump has the same size, but its flow rate can be changed by selecting different plunger diameters. The safe working pressure of the pump can be adjusted by the safety valve, and the low-pressure relief pressure can be adjusted by adjusting the set pressure of the relief valve. High and low pressure selection can meet the needs of customers with different pressure and flow ranges. At the same time, in order to achieve small volume, large flow and high pressure, the annular protrusion of a single plunger pump is set to an annular conical column. In this way, when a large-diameter plunger is used in conjunction with a small-volume pump body plunger cavity, a high pressure of 70MPa can be achieved. This solves the problem that a large-diameter plunger can only achieve high pressure when used with a large-volume pump body plunger cavity. Once a small-volume pump body uses a large-diameter plunger, high-pressure leakage will occur;

[0025] 3. At the same time, the design and installation of some plunger pumps are not firm enough. The eccentric wheel drives the plunger pump to reciprocate, which will cause the pump body to deviate and shake outward. The present invention connects six plunger pumps end to end through several connecting plates to form a whole. In this way, when the pump body of the plunger pump is stressed, the force will be shared with other plunger pumps, so that the problem of deviating and shaking will not occur, thereby improving the safety performance of the product;

[0026] 4. The oil suction valve group and the oil discharge valve group of the plunger pump of the present invention are integrated inside the pump body, and the volume is small. At the same time, the filter screen is directly installed on the side of the oil suction port, which reduces the overall structure volume and is easy to install and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This invention is a schematic diagram Figure 1 .

[0028] Figure 2 This invention is a schematic diagram Figure 2 .

[0029] Figure 3 It is a vertical central sectional schematic diagram of the present invention.

[0030] Figure 4 It is a schematic cross-sectional view of the upper flow channel of the present invention.

[0031] Figure 5 It is a schematic cross-sectional view of the lower flow channel of the present invention.

[0032] Figure 6 It is a vertical cross-sectional view of the outlet flow channel, the third flow channel, and the one-way valve of the present invention.

[0033] Figure 7 It is a partial enlarged cross-sectional view of the pressure relief valve of the present invention.

[0034] Figure 8 It is a bottom-up stereoscopic schematic diagram of the valve body of the present invention.

[0035] Fig. 9 It is a schematic diagram of the plunger pump of the present invention.

[0036] Fig.10 It is a side view of the plunger pump of the present invention.

[0037] Fig.11 yes Fig. 9 Section view along AA direction.

[0038] Fig.12 It is a schematic diagram of the annular protrusion of the plunger pump of the present invention being designed as an annular conical column. DETAILED DESCRIPTION

[0039] Refer to the attached Figure 1-12 The flow rate-changeable integrated high-pressure pump comprises a valve body 10, a drive shaft 20, an eccentric wheel 30 and a plunger pump 40. The valve body 10 is configured as a cylinder and has an axial hole in the middle. The drive shaft 20 is rotatably mounted in the axial hole through a bearing. The lower end of the drive shaft 20 passes through the axial hole and is mounted with an eccentric wheel 30.

[0040] like Figure 8 The bottom of the valve body 10 is evenly designed with six flow channel openings 101 near the periphery. The valve body 10 is designed with nine threaded oil ports 102 around the periphery. The nine threaded oil ports 102 are divided into two rows, the upper row is provided with five threaded oil ports 102, and the lower row is provided with four threaded oil ports 102. Figure 2 A plunger pump 40 is installed at each of the six flow passages 101 at the lower end of the valve body 10; the inner side of each plunger pump 40 abuts against the outer side of the eccentric wheel 30;

[0041] Six vertical flow channels are respectively designed on the six flow channel openings 101, two of which are symmetrically arranged with respect to the center of the valve body 10 and serve as vertical low-pressure flow channels 103, and the remaining four vertical flow channels are also symmetrically arranged with respect to the center of the valve body 10 and serve as vertical high-pressure flow channels 104;

[0042] An upper flow channel is designed near the upper end of the valve body 10, and a lower flow channel is designed near the middle position of the valve body 10.

[0043] like Figure 3 , 4, the upper flow channel includes a first flow channel 105, a second flow channel 106, a third flow channel 107, a fourth flow channel 108 and a pressure relief flow channel 109, the first flow channel 105 and the second flow channel 106 are arranged in parallel in the valve body 10, the inner side end of the first flow channel 105 is connected to the upper end of one of the vertical low-pressure flow channels 103, the other end of the first flow channel 105 is connected to one of the five threaded oil ports 102 in the upper row on the outside of the valve body 10, and a threaded plug is installed in the threaded oil port 102, the inner side end of the fourth flow channel 108 is vertically connected to the inner side end of the second flow channel 106, the other end of the fourth flow channel 108 is connected to the upper end of another vertical low-pressure flow channel 103, and the outer side end of the fourth flow channel 108 is connected to one of the five threaded oil ports 102, and a threaded plug is installed in the threaded oil port 102; the other end of the second flow channel 106 The first end of the first flow channel 105 is connected to one of the five threaded oil ports 102 in the upper row on the outside of the valve body 10, and a threaded plug is installed in the threaded oil port 102. The first flow channel 105 and the second flow channel 106 are connected by a third flow channel 107 near the outer threaded oil port 102. Any end of the third flow channel 107 passes through the first flow channel 105 or the second flow channel 106 and is connected to one of the five threaded oil ports 102, and a threaded plug is installed in the threaded oil port 102; a pressure relief flow channel 109 is arranged on the outside of the inner side end of the first flow channel 105, the first flow channel 105 and the pressure relief flow channel 109 are perpendicular to each other but not connected, a pressure relief vertical flow channel 115 is arranged below the inner side end of the pressure relief flow channel 109, the outer side of the pressure relief flow channel 109 is connected to one of the five threaded oil ports 102, and the threaded oil port 102 forms a pressure relief port;

[0044] like Figure 3 , 5The lower flow channel includes a fifth flow channel 110, a sixth flow channel 111, an outlet flow channel 112, and a pressure relief valve flow channel 113. The fifth flow channel 110 and the sixth flow channel 111 are arranged in parallel with each other. One end of the fifth flow channel 110 is connected to the upper end of a vertical high-pressure flow channel 104, and one end of the sixth flow channel 111 is connected to the upper end of a vertical high-pressure flow channel 104. The other end of the fifth flow channel 110 is connected to the upper end of a vertical high-pressure flow channel 104 and then connected to one of the four threaded oil ports 102 in the lower row, and a threaded plug is installed in the threaded oil port 102; the other end of the sixth flow channel 111 is connected to the upper end of a vertical high-pressure flow channel 104 and then connected to one of the four threaded oil ports 102 in the lower row, and a threaded plug is installed in the threaded oil port 102. A safety valve 70 is installed; both ends of the outlet flow channel 112 are connected to the fifth flow channel 110 and the sixth flow channel 111, and one end of the outlet flow channel 112 is connected to one of the four threaded oil ports 102 in the lower row, and an outlet joint 60 is installed in the threaded oil port 102; the inner end of the pressure relief valve flow channel 113 is vertically connected to the middle position of one side of the sixth flow channel 111, and the outer end of the pressure relief valve flow channel 113 is connected to one of the four threaded oil ports 102 in the lower row, and a pressure relief valve 80 is installed in the threaded oil port 102; the middle of the pressure relief valve flow channel 113 is connected to the middle position of one of the vertical low-pressure flow channels 103, which is also the inlet of the pressure relief valve, and the lower end of the pressure relief vertical flow channel 115 is connected to the upper end of the pressure relief valve flow channel 113, which is also the outlet of the pressure relief valve;

[0045] like Figure 6 The third flow channel 107 and the outlet flow channel 112 are connected to each other via the seventh flow channel 116, and the lower end of the seventh flow channel 116 is connected to the lower end surface of the valve body 10;

[0046] like Figure 6 The seventh flow channel 116 is also provided with a one-way valve 90 and the lower end of the seventh flow channel 116 is blocked by the one-way valve. The third flow channel 107 is located above the outlet flow channel 112 and the two are arranged parallel to each other.

[0047] The seventh flow channel includes a large circular hole, a medium circular hole and a small circular hole. The lower end of the large circular hole is connected to the bottom end face of the valve body, the middle of the upper end of the large circular hole is connected to the lower end of the medium circular hole, the upper end of the medium circular hole is connected to the lower end of the small circular hole, and the upper end of the small circular hole is connected to the third flow channel; the medium circular hole is connected to the outlet flow channel near the middle position; an internal thread is arranged in the lower middle of the medium circular hole, the one-way valve includes a plug valve body, a valve seat, a spherical valve core, and a spring. The valve seat is designed as a hollow cylinder with a center hole, and the valve seat is installed at the upper end of the middle circular hole. The plug valve body includes a plug head and a plug rod. An inner hexagonal hole is designed in the middle of the lower end of the plug head. The upper end of the plug head is connected to the plug rod, and an external thread is arranged around the outer side of the plug rod. A valve core circular groove is opened in the middle of the end, and a spring groove is designed in the middle of the bottom of the valve core circular groove, and a spring is installed in the spring groove. The upper end of the plug rod is screwed into the middle circular hole and a transverse through hole is opened on one side of the bottom of the valve core circular groove. The transverse through hole is connected to the outer circumferential surface of the plug rod. There is no thread on the outside of the plug rod and the transverse through hole upward, and a gap is left between this section of the plug rod and the middle circular hole. The middle circular hole is designed to be two sections of holes, namely the upper section hole and the lower section hole. The lower section hole extends from the position of the large circular hole to a distance above the connection with the outlet flow channel, and the remaining middle circular hole is set as the upper section hole. The valve seat is embedded in the upper section hole, and the inner diameter of the upper section hole is smaller than the inner diameter of the lower section hole. The upper end of the plug rod extends into the lower section hole and is located in a hole a distance above the outlet flow channel. A spherical valve core is installed inside the valve core circular groove, a spring is supported at the lower end of the spherical valve core, and the upper end of the spherical valve core is sealed and pressed against the middle hole of the valve seat; the upper end of the upper hole of the middle circular hole is designed as an inner conical surface, and the upper end surface of the valve seat is provided with an outer conical surface, and the outer conical surface of the valve seat is sealed with the inner conical surface on the upper hole of the middle circular hole.

[0048] The design of the seventh flow channel is mainly to install the one-way valve with the help of the valve body. When low-pressure and high-flow oil supply is realized, four high-pressure plunger pumps and two low-pressure plunger pumps work at the same time. The two low-pressure plunger pumps can easily overcome the spring pressure of the one-way valve and open the one-way valve to supply oil. When the oil supply reaches a certain stage, the system pressure rises, and the two low-pressure plunger pumps cannot work effectively, and they cannot continue to supply oil at a large flow rate. At this time, the pressure relief valve will be opened by the set pressure supply, and the oil supply of the two low-pressure plunger pumps is directly completed through the pressure relief pipeline to complete the pressure relief and stop working. The one-way valve is reset and closed, and only four high-pressure plunger pumps are left to supply high-pressure oil, reducing the oil supply and supplying oil slowly, which is safe and reliable.

[0049] like Figure 2A threaded hole 120 is installed on both sides of each flow channel opening 101, and a bolt hole 13 is also designed on both sides of the plunger pump 40. The two sides of the plunger pump 40 are respectively locked in the threaded hole 120 after the screw passes through the bolt hole 13, and the outlet of the plunger pump 40 is sealed and matched with the corresponding flow channel opening 101; the adjacent plunger pumps 40 are connected and fixed by a connecting plate 401, and a through hole is designed at both ends of the connecting plate 401. One end of the connecting plate 401 is sleeved on the screw 402 of a plunger pump 40 through the through hole and the end of the connecting plate 401 is pressed under the plunger pump 40, and the other end of the connecting plate 401 is also sleeved on the screw 402 of the adjacent plunger pump 40 through the through hole and the end of the connecting plate 401 is pressed under the plunger pump 40.

[0050] like Figure 8The pressure relief valve 80 includes a pressure relief valve body 801, a pressure relief spring 802, a pressure relief valve core 803 and a sealing ring 804. The pressure relief valve flow channel 113 includes a large cylindrical flow channel 1131, a medium cylindrical flow channel 1132 and a small cylindrical flow channel 1133. The outer side of the large cylindrical flow channel 1131 is connected to the outer peripheral surface of the valve body, the inner side of the large cylindrical flow channel 1131 is connected to the outer side of the medium cylindrical flow channel 1132, and the inner side of the medium cylindrical flow channel 1132 is connected to the small cylindrical flow channel 1133. The outside of the small cylindrical flow channel 1133 is connected to the middle position of one side of the sixth flow channel 111; the pressure relief valve body 801 is designed to be cylindrical, the outer end of the pressure relief valve body 801 is designed to be hexagonal, a circular groove is provided in the middle of the inner end of the pressure relief valve body 801, and the outer periphery of the pressure relief valve body 801 is provided with an external thread near the inner end, and the large cylindrical flow channel 1131 is designed with an internal thread, and the pressure relief valve core 803 includes a large cylinder 8031, a cone 8032 and a small cylinder 803 3. One end of the large cylinder 8031 ​​is connected to the large end of the cone 8032, and the small end of the cone 8032 is connected to one end of the small cylinder 8033. The outer side of the large cylinder 8031 ​​is sleeved with a pressure relief spring 802. The other end of the small cylinder 8033 is inserted into the middle cylindrical flow channel 1132 and the other end of the small cylinder 8033 is designed with an annular groove 8034. The annular groove 8034 is sleeved with a sealing ring 804. The small end of the cone 8032 is sealed and pressed against the outer side of the middle cylindrical flow channel 1132. At the side opening, the pressure relief valve body 801 is rotatably installed in the large cylindrical flow channel 1131 and the pressure relief valve body 801 is sleeved on the outside of the pressure relief spring 802. One end of the pressure relief spring 802 is pressed against the bottom of the circular groove of the pressure relief valve body 801, and the other end of the pressure relief spring 802 is pressed against the outside of the large end of the cone 8032. The lower end of the pressure relief vertical flow channel 115 is connected to the upper position near the bottom of the large cylindrical flow channel 1131, and one of the vertical low-pressure flow channels 103 is connected to the position near the outer end of the medium cylindrical flow channel 1132. There is a gap between the outer end of the small cylinder 8033 and the outer side of the medium cylindrical flow channel 1132. The gap is matched. After the cone of the pressure relief valve is opened, the hydraulic oil in the low-pressure pipeline can enter the pressure relief vertical flow channel from the gap, and finally flow back to the inside of the oil tank from the pressure relief hole.

[0051] When the pressure relief valve is actuated, when the load of the four high-pressure plunger pumps and the two low-pressure plunger pumps increases, the oil supply pressure also increases. Once the pressure increases to the set pressure (10MPa), the pressure oil in the sixth flow channel 111 pushes the small cylinder 8033 of the pressure relief valve core 803 to move outward through the small cylindrical flow channel 1133, overcoming the preload force of the pressure relief spring 802, so that the cone 8032 and the outer mouth seal of the middle cylindrical flow channel 1132 are opened. In this way, the low-pressure oil supply of the two low-pressure plunger pumps is from the vertical low-pressure flow channel 103 through the gap flow channel between the small cylinder 8033 and the middle cylindrical flow channel 1132 to relieve the vertical flow channel, and finally flows back to the inside of the oil tank from the pressure relief hole, completing the low-pressure pressure relief. At the same time, the one-way valve is closed. At this time, there are only four high-pressure plunger pumps in the system for high-pressure oil supply.

[0052] The present invention sets high and low pressure flow channels in series in the valve body, the one-way valve is installed internally, and the pressure relief valve is also mostly built-in in the valve body and cooperates with the pressure relief valve flow channel structure design to realize the pressure relief function; the safety valve is set to 70MPa, which can also be adjusted up and down according to actual needs; the pressure relief valve is set according to actual needs, and the pressure relief pressure can be adjusted by rotating the pressure relief valve body 801 to compress the pressure relief spring, which is generally set to about 10MPa. In this way, the flow channels are connected in series inside the valve body, and various valves are integrated on the valve body. The structure is small and compact, there is no leakage, and high pressure can be achieved.

[0053] like Figure 9-11 The plunger pump 40 comprises a pump body 1, a plunger rod 2, a spring 3, a plunger head 4, an oil suction valve group 5, and an oil outlet valve group 6. The pump body 1 is designed as a rectangular valve block. A pump chamber 11 is horizontally designed in the middle of the pump body 1 and is connected to the front and back. An annular protrusion 7 is designed on the outer side of one end of the pump chamber 11. The pump chamber 11 is connected to the middle hole 71 of the annular protrusion 7. The oil suction valve group 5 is installed on the inner side of the other end of the pump chamber 11. An oil outlet channel 12 is designed in the middle of the upper end of the pump body 1. The lower end of the oil outlet channel 12 is connected to the pump chamber 11, the upper end of the oil outlet channel 12 is connected to the upper end face of the pump body 1, an oil outlet valve group 6 is installed on the inner side of the outlet of the oil outlet channel 12, a plunger head 4 is installed on one end of the plunger rod 2, and the other end of the plunger rod 2 is slidably sealed in the middle hole 71 of the annular protrusion 7 and the front hole of the pump chamber 11, the spring 3 is sleeved on the outside of the annular protrusion 7, and one end of the spring 3 is pressed against the inner side of the plunger head 4, and the other end of the spring 3 is pressed against the outside of the pump body 1, and a filter screen 8 is designed on the external oil inlet side of the oil suction valve group 5.

[0054] like Fig.12The annular protrusion 7 is designed as an annular conical column 70, and the annular conical column 70 is designed to be thin on the outside and thick at the root; the spring 3 is designed as a conical column spring 30, and the end of the conical column spring 30 with a thick diameter is sleeved on the outside of the root of the annular conical column and the end is pressed against the outer side of the pump body 1, and the end of the conical column spring 30 with a thin diameter is sleeved on the outside of the plunger rod 2 and the end is pressed against the inner side of the plunger head 4. The annular protrusion is usually designed as a hollow cylinder. When it is designed as an annular conical column, when the middle hole 71 in the middle (which is also a part of the pump cavity matched with the plunger rod) is replaced with a large aperture, the outer annular cavity wall must be thinned without changing the size of the pump body. When the aperture is 15-16mm, it can only reach 35Mpa, so it is impossible to achieve a high pressure of 70Mpa. Once the pressure is too high, leakage will occur between the middle hole of the annular protrusion and the plunger rod. The design designs the annular protrusion 7 into an annular conical column, so that the wall thickness of the annular protrusion becomes a tapered structure that gradually thickens from the outside to the inside, and the previous cylindrical spring is also changed into a corresponding conical columnar spring, so that the plunger rod diameter can be increased to 15-16mm without increasing the volume of the pump body, and the high pressure of 70Mpa can still be achieved without leakage problems. The increase in the plunger rod diameter increases the flow rate, and can also achieve rapid high-pressure oil injection under high pressure conditions, with high efficiency.

[0055] The inner diameter of the middle hole 71 inside the annular protrusion 7 is designed to be 6-16mm; a bolt hole 13 is designed on both sides of the pump body 1, and the two bolt holes 13 are located on both sides of the pump cavity 11 and are parallel to the oil outlet flow channel 12. An annular step is designed on the inner side of the mouth of the oil outlet flow channel 12, and a sealing ring 14 is designed and installed in the annular step. The inner diameter of the middle hole inside the annular protrusion 7 is designed to be 6-16mm, and the flow rate changes from small to large. When the flow-changeable integrated high-pressure pump is assembled, the customer can install the plunger pump of the inner diameter size of the middle hole according to his needs. In addition, the pump body of the present invention is inconvenient to design, and it is easy to replace. Replacing the plunger pump with different aperture sizes can achieve flow changes, meet the needs of more occasions, and have a wider range of applications. Combined with the annular protrusion, it can be designed into an annular conical column. Without changing the volume of the pump body, it can also meet the high-pressure and large-flow operations, further increase the application range of the present invention, and meet a wider range of application occasions. The sealing ring 14 is used to ensure that the pump body of the present invention is sealed with the lower end of the valve body 10 of the present invention when the pump body of the present invention is installed and used.

[0056] like Fig.11The oil suction valve group 5 comprises an oil suction valve body 51, an oil suction valve plate 52, and a circular baffle plate 53 with a hole. The inlet and outlet sides of the pump chamber 11 are internally designed with a first circular groove 54 for installing the oil suction valve body 51 of the oil suction valve group 5. The inner side of the circular groove is designed with an internal thread. The oil suction valve body 51 is designed as a cylinder. The outer side of the oil suction valve body 51 is designed with an external thread. The middle of the oil suction valve body 51 is designed with an oil inlet through hole 55. The oil outlet side of the oil inlet through hole 55 is internally designed with a first annular groove 56. The outer side of the first annular groove 56 is A second annular groove 57 is also designed on the side, and the inner diameter of the second annular groove 57 is larger than that of the first annular groove 56, and the inner diameter of the first annular groove 56 is larger than that of the oil inlet hole 55; the oil suction valve plate 52 is slidably installed in the first annular groove 56, the circular baffle plate 53 with holes is installed in the second annular groove 57 and the circular baffle plate 53 with holes blocks the outside of the first annular groove 56, and the oil suction valve body 51 is rotatably installed in the first circular groove 54 through threaded cooperation, and the root end surface of the first annular groove 56 is sealed with the oil suction valve plate 52. A plurality of semicircular grooves 561 are designed on the inner peripheral wall of the first annular groove 56, and the ends of the semicircular grooves 561 are correspondingly connected to the circular holes on the circular baffle plate 53 with holes. The oil suction valve group 5 further includes an oil suction conical spring 58. An annular groove is designed on the inner side of the root end surface of the first annular groove 56. The oil suction conical spring 58 is supported and installed in the first annular groove 56, and the thin end of the oil suction conical spring 58 is pressed against one side of the oil suction valve plate 52, and the thick end of the oil suction conical spring 58 is pressed against the inner side of the perforated circular baffle 53. The oil inlet side end surface of the oil suction valve body 51 is designed with a cross groove or a plum blossom groove 59. The cross groove or the plum blossom groove 59 is designed to facilitate the rotation of the oil suction valve body in the first circular groove.

[0057] The oil outlet valve group 6 comprises an oil outlet valve body 61, an oil outlet valve plate 62, and an annular valve seat 63. The inner side of the outlet of the oil outlet flow channel 12 of the pump body 1 is designed with a second circular groove 64 for installing the oil outlet valve body 61 of the oil outlet valve group 6. The oil outlet valve body 61 is designed as a cylinder. A first circular groove 65 is designed in the middle of the oil outlet valve body 61. A second circular groove 66 is designed at the lower end of the first circular groove 65. The inner diameter of the second circular groove 66 is larger than that of the first circular groove 65. The lower end of the second circular groove 66 is connected to the oil outlet. The lower end surface of the valve body 61 is connected, and a plurality of arc-shaped grooves 67 are designed around the upper end of the oil outlet valve body 61. The upper end of the arc-shaped groove 67 is connected to the upper end surface of the oil outlet valve body 61, and the bottom of the arc-shaped groove 67 is connected to the upper end of the first circular groove 65. The annular valve seat 63 is installed in the second circular groove 66. The inner diameter of the annular valve seat 63 is smaller than the first circular groove 65. The oil outlet valve plate 62 is slidably installed in the first circular groove 65, and the end surface of the oil outlet valve plate 62 is sealed with the upper end surface of the annular valve seat 63. The oil outlet valve group 6 also includes an oil outlet conical spring 68. An annular protrusion 7 is designed on the upper end of the annular valve seat 63. The annular protrusion 7 extends into the first circular groove 65 for a distance and an annular groove is formed between the annular protrusion 7 and the first circular groove 65. The oil outlet conical spring 68 is located in the first circular groove 65. The thin end of the oil outlet conical spring 68 is pressed against the oil outlet valve plate 62, and the thick end of the oil outlet conical spring 68 is pressed against the first circular groove 65. The lower end surface of the oil outlet valve plate 62 is sealed with the upper end surface of the annular protrusion 7.

[0058] The outer side of the oil outlet valve body 61 is designed with an external thread, and the inner side of the second circular groove 64 of the pump body 1 is designed with an internal thread. The oil outlet valve body 61 is installed in the second circular groove 64 of the pump body 1 through threaded matching. Since the pump body and the valve body are sealed and fixed together, it is not necessary to design the external thread and the internal thread to match, but the design of internal and external thread matching can enable better assembly.

[0059] The filter screen 8 is designed as a basin-shaped filter screen 8, and the basin-shaped filter screen 8 is covered on the outside of the oil inlet side of the oil suction valve group 5. The basin-shaped filter screen 8 is fixed to the outside of the pump body 1 by a pressure plate 81. The pressure plate 81 is designed as a rectangular plate. A circular hole is opened in the middle of the rectangular plate, and mounting holes are designed at the four corners of the rectangular plate. Threaded holes are designed on the outer side of the pump body 1 corresponding to the mounting holes. The rectangular plate is sleeved on the outside of the basin-shaped filter screen 8 through the circular holes and the rectangular plate is pressed on the annular flange of the basin-shaped filter screen 8. The four corners of the rectangular plate are locked in the threaded holes on the outer side of the pump body 1 by screws passing through the mounting holes.

[0060] When the plunger pump of the present invention is used, the pump body and the annular protrusion are integrally manufactured and formed, a middle circular groove is designed in the middle of the pump cavity inside the pump body, a large circular groove is designed on the oil inlet side of the middle circular groove, the outer side of the large circular groove is designed as a first circular groove (for internally installing an oil suction valve group), the other side of the middle circular groove is designed as a small circular groove, the inner diameter of the small circular groove is designed to be the same as the middle hole in the annular protrusion, and the small circular groove is connected to the middle hole, the lower end of the oil outlet flow channel is connected to the middle circular groove and the large circular groove, the upper end of the oil outlet flow channel is designed as a second circular groove (for internally installing an oil outlet valve group), and the filter is fixedly installed on the outer side of the oil suction valve group for To filter foreign matter in the hydraulic oil, the plunger rod is slidably inserted into the middle hole of the annular protrusion, and the spring is supported between the plunger head and the pump body to reset the plunger rod. The pump body of the present invention can be installed on the valve body 10 of the integrated high-pressure pump with variable flow rate, and fixed to the bottom of the valve body 10 through the threaded hole. The eccentric wheel slides against the outside of the plunger head so that the plunger rod can achieve reciprocating motion. When working, when the spring on the outside of the plunger rod is squeezed and compressed by the eccentric cam, the plunger rod is pushed into the pump chamber, and the suction valve plate of the suction valve group is pressed and slides to the first annular groove under the action of the suction conical spring. On the oil inlet side, the oil suction valve plate is sealed with the root end face of the first annular groove, and the hydraulic oil inside the pump chamber enters the oil outlet channel through the large circular groove and the middle circular groove, pressing the oil outlet valve plate of the oil outlet valve group upward and overcoming the force of the oil outlet conical spring. The oil outlet valve plate slides upward and squeezes the oil outlet conical spring into a sheet shape. At this time, the hydraulic oil in the oil outlet channel passes through the annular valve seat and enters the first circular groove, and is connected to the outlet on the outside of the oil outlet valve group through the arc-shaped grooves around it to complete the oil outlet. When sucking oil, the plunger rod is reset under the action of the spring, and the plunger rod is drawn out from the pump chamber. At this time, the oil pressure in the pump chamber is reduced , the oil outlet valve plate of the oil outlet valve group slides inward and downward under the action of the oil outlet conical spring and the oil pressure on the outlet side, and contacts with the upper end face of the annular valve seat in a sealing manner, closing the oil outlet valve group. At the same time, the oil suction valve plate of the oil suction valve group is affected by the low pressure in the pump chamber. The external inlet oil pressure is higher than the internal pump chamber oil pressure, and overcomes the supporting force of the oil suction conical spring, pushing the oil suction valve plate inward and pressing the oil suction conical spring into a sheet. The hydraulic oil enters the oil inlet through-hole through the filter screen, and then into the first annular groove, and is connected to the circular hole of the circular baffle with holes through the semicircular grooves on all sides, and finally enters the pump chamber to complete the oil intake.

[0061] The overall design structure of the present invention is small and compact. When in use, it can be installed inside the oil tank of the mobile pump station without being installed on the outside of the oil tank, saving installation space, reducing the volume of the pump station, and facilitating the movement of the pump station. At the same time, it can operate at high pressure without leakage, and is safe and reliable.

Claims

1. An integrated high-pressure pump with interchangeable flow rate, characterized in that: It includes a valve body, a driving shaft, an eccentric wheel, and a plunger pump. The valve body is set as a cylinder with an axial hole in the middle. The driving shaft is rotatably installed in the axial hole through a bearing. The lower end of the driving shaft passes through the axial hole and is installed with an eccentric wheel. Six flow passages are evenly designed near the bottom of the valve body, and nine threaded oil ports are designed around the valve body. The nine threaded oil ports are divided into two rows, the upper row is provided with five threaded oil ports, and the lower row is provided with four threaded oil ports. A plunger pump is respectively installed at the position corresponding to the six flow passages at the lower end of the valve body; the inner side of each plunger pump is respectively in contact with the outer side of the eccentric wheel; Six vertical flow channels are designed on the six flow channel openings, two of which are symmetrically arranged with respect to the center of the valve body and serve as vertical low-pressure flow channels, and the remaining four vertical flow channels are also symmetrically arranged with respect to the center of the valve body and serve as vertical high-pressure flow channels; The upper flow channel is designed near the upper end of the valve body, and the lower flow channel is designed near the middle of the valve body. The upper flow channel includes a first flow channel, a second flow channel, a third flow channel, a fourth flow channel and a pressure relief flow channel. The first flow channel and the second flow channel are arranged in parallel in the valve body. The inner end of the first flow channel is connected to the upper end of one of the vertical low-pressure flow channels, and the other end of the first flow channel is connected to a corresponding one of the five threaded oil ports in the upper row on the outer side of the valve body, and a threaded plug is installed in the threaded oil port. The inner end of the fourth flow channel is vertically connected to the inner end of the second flow channel, and the other end of the fourth flow channel is connected to the upper end of another vertical low-pressure flow channel, and the outer end of the fourth flow channel is connected to a corresponding one of the five threaded oil ports, and a threaded plug is installed in the threaded oil port; the other end of the second flow channel is connected to the inner end of the second flow channel, and the other end of the fourth flow channel is connected to the upper end of another vertical low-pressure flow channel, and the outer end of the fourth flow channel is connected to a corresponding one of the five threaded oil ports, and a threaded plug is installed in the threaded oil port; A corresponding threaded oil port among the five threaded oil ports in the upper row on the outer side of the valve body is connected, and a threaded plug is installed in the threaded oil port. The first flow channel and the second flow channel are connected through the third flow channel near the outer threaded oil port. Any end of the third flow channel passes through the first flow channel or the second flow channel and is connected to a corresponding threaded oil port among the five threaded oil ports, and a threaded plug is installed in the threaded oil port; a pressure relief flow channel is arranged on the outer side of the inner side end of the first flow channel, the first flow channel and the pressure relief flow channel are perpendicular to each other but not connected, a pressure relief vertical flow channel is arranged below the inner side end of the pressure relief flow channel, the outer side of the pressure relief flow channel is connected to a corresponding threaded oil port among the five threaded oil ports, and the threaded oil port forms a pressure relief port; The lower flow channel includes a fifth flow channel, a sixth flow channel, an outlet flow channel, and a pressure relief valve flow channel. The fifth flow channel and the sixth flow channel are arranged in parallel with each other. One end of the fifth flow channel is connected to the upper end of a corresponding vertical high-pressure flow channel, and one end of the sixth flow channel is connected to the upper end of a corresponding vertical high-pressure flow channel. The other end of the fifth flow channel is connected to the upper end of the corresponding vertical high-pressure flow channel and then connected to a corresponding threaded oil port in the lower row of four threaded oil ports, and a threaded plug is installed in the threaded oil port; the other end of the sixth flow channel is connected to the upper end of the corresponding vertical high-pressure flow channel and then connected to a corresponding threaded oil port in the lower row of four threaded oil ports, and the threaded oil port is installed with a threaded plug; A safety valve is installed in the threaded oil port; both ends of the outlet flow channel are connected to the fifth flow channel and the sixth flow channel, and one end of the outlet flow channel is connected to a corresponding threaded oil port in the lower row of four threaded oil ports, and an outlet joint is installed in the threaded oil port; the inner end of the pressure relief valve flow channel is vertically connected to the middle position of one side of the sixth flow channel, and the outer end of the pressure relief valve flow channel is connected to a corresponding threaded oil port in the lower row of four threaded oil ports, and a pressure relief valve is installed in the threaded oil port; the middle of the pressure relief valve flow channel is connected to the middle position of one of the vertical low-pressure flow channels, which is also the inlet of the pressure relief valve, and the lower end of the pressure relief vertical flow channel is connected to the upper end of the pressure relief valve flow channel, which is also the outlet of the pressure relief valve; The third flow channel is connected to the outlet flow channel in upper and lower parts through a seventh flow channel, and the lower end of the seventh flow channel is connected to the lower end surface of the valve body; A one-way valve is also installed in the seventh flow channel, and the lower end of the seventh flow channel is blocked by the one-way valve.

2. The flow-changeable integrated high-pressure pump according to claim 1, characterized in that: A threaded hole is installed on both sides of each flow channel opening, and a bolt hole is also designed on both sides of the plunger pump. The two sides of the plunger pump are respectively locked in the threaded holes after the screws pass through the bolt holes, and the outlet of the plunger pump is sealed and matched with the corresponding flow channel opening; adjacent plunger pumps are connected and fixed by connecting plates, and a through hole is designed at both ends of the connecting plate. One end of the connecting plate is sleeved on the screw of a plunger pump through the through hole and the end of the connecting plate is pressed under the plunger pump, and the other end of the connecting plate is also sleeved on the screw of the adjacent plunger pump through the through hole and the end of the connecting plate is pressed under the plunger pump.

3. The flow-changeable integrated high-pressure pump according to claim 1, characterized in that: The pressure relief valve comprises a pressure relief valve body, a pressure relief spring, a pressure relief valve core and a sealing ring. The pressure relief valve flow channel comprises a large cylindrical flow channel, a medium cylindrical flow channel and a small cylindrical flow channel. The outer side of the large cylindrical flow channel is connected to the outer peripheral surface of the valve body, the inner side of the large cylindrical flow channel is connected to the outer side of the medium cylindrical flow channel, the inner side of the medium cylindrical flow channel is connected to the outer side of the small cylindrical flow channel, and the inner side of the small cylindrical flow channel is connected to the middle position of one side of the sixth flow channel. The pressure relief valve body is designed to be cylindrical, the outer end of the pressure relief valve body is designed to be hexagonal, a circular groove is provided in the middle of the inner end of the pressure relief valve body, the outer periphery of the pressure relief valve body is provided with an external thread near the inner end, the large cylindrical flow channel is designed with an internal thread, and the pressure relief valve core comprises a large cylinder, a cone and A small cylinder, one end of the large cylinder is connected to the large end of the cone, the small end of the cone is connected to one end of the small cylinder, a pressure relief spring is sleeved on the outside of the large cylinder, the other end of the small cylinder is inserted into the middle cylindrical flow channel and the other end of the small cylinder is designed with an annular groove, a sealing ring is sleeved in the annular groove, the small end of the cone is sealed and pressed against the outer mouth of the middle cylindrical flow channel, the pressure relief valve body is rotatably installed in the large cylindrical flow channel and the pressure relief valve body is sleeved on the outside of the pressure relief spring, one end of the pressure relief spring is against the bottom of the circular groove of the pressure relief valve body, and the other end of the pressure relief spring is against the outside of the large end of the cone; the lower end of the pressure relief vertical flow channel is connected to the upper position near the bottom of the large cylindrical flow channel, and the middle of one of the vertical low-pressure flow channels is connected to the position near the outer end of the middle cylindrical flow channel.

4. The flow-changeable integrated high-pressure pump according to claim 1, characterized in that: The plunger pump comprises a pump body, a plunger rod, a spring, a plunger head, an oil suction valve group and an oil discharge valve group. The pump body is designed as a rectangular valve block. A pump chamber that runs through the front and back is horizontally designed in the middle of the pump body. An annular protrusion is designed on the outer side of one end of the pump chamber. The pump chamber is connected to the middle hole of the annular protrusion. An oil suction valve group is installed on the inner side of the other end portion of the pump chamber. An oil discharge channel is designed in the middle of the upper end of the pump body. The lower end of the oil discharge channel is connected to the pump chamber, and the upper end of the oil discharge channel is connected to the upper end face of the pump body. An oil discharge valve group is installed on the inner side of the outlet of the oil discharge channel. A plunger head is installed at one end of the plunger rod, and the other end of the plunger rod is slidingly sealed in the middle hole of the annular protrusion and the front hole of the pump chamber. The spring is sleeved on the outer side of the annular protrusion, and one end of the spring is pressed against the inner side of the plunger head, and the other end of the spring is pressed against the outer side of the pump body. A filter is designed on the external oil inlet side of the oil suction valve group.

5. The flow-changeable integrated high-pressure pump according to claim 4, characterized in that: The annular protrusion is designed as an annular conical cylinder, and the annular conical cylinder is designed to be thin on the outside and thick at the root; the spring is designed as a conical cylindrical spring, the end of the spring with a thick diameter is sleeved on the outside of the root of the annular conical cylinder and the end is pressed against the outer side of the pump body, and the end of the spring with a thin diameter is sleeved on the outside of the plunger rod and the end is pressed against the inner side of the plunger head.

6. The flow-changeable integrated high-pressure pump according to claim 4 or 5, characterized in that: The inner diameter of the middle hole inside the annular protrusion is designed to be 6-16mm; a bolt hole is designed on both sides of the pump body, the two bolt holes are located on both sides of the pump cavity and are parallel to the oil outlet channel, an annular step is designed on the inner side of the oil outlet channel mouth, and a sealing ring is designed and installed inside the annular step.

7. The integrated high-pressure pump with interchangeable flow rate according to claim 4, characterized in that: The oil suction valve group comprises an oil suction valve body, an oil suction valve plate, and a circular baffle with a hole. The inlet and outlet sides of the pump chamber are internally designed with a first circular groove for installing the oil suction valve body of the oil suction valve group, the inner side of the circular groove is designed with an internal thread, the oil suction valve body is designed as a cylinder, the outer side of the oil suction valve body is designed with an external thread, the middle of the oil suction valve body is designed with an oil inlet through hole, the oil outlet side of the oil inlet through hole is internally designed with a first annular groove, and a second annular groove is also designed on the outer side of the first annular groove, the inner diameter of the second annular groove is larger than the first annular groove, and the inner diameter of the first annular groove is larger than the oil inlet through hole; the oil suction valve plate is slidably installed in the first annular groove, the circular baffle with a hole is installed in the second annular groove, and the circular baffle with a hole blocks the first annular groove. shaped groove outside, the oil suction valve body is rotatably installed in the first circular groove through threaded cooperation, and the root end face of the first annular groove is sealed with the oil suction valve plate; a plurality of semicircular grooves are designed on the inner circumferential wall of the first annular groove, and the ends of the semicircular grooves are correspondingly connected with the circular holes on the circular baffle with holes; the oil suction valve group also includes an oil suction conical spring, and an annular groove is designed on the inner side of the root end face of the first annular groove, the oil suction conical spring support is installed in the first annular groove, and the thin end of the oil suction conical spring is against one side of the oil suction valve plate, and the other end of the oil suction conical spring is against the inner side of the circular baffle with holes; the oil inlet side end face of the oil suction valve body is designed with a cross-shaped groove or a plum blossom-shaped groove.

8. The flow-changeable integrated high-pressure pump according to claim 4, characterized in that: The oil outlet valve group includes an oil outlet valve body, an oil outlet valve plate, and an annular valve seat. The inner side of the outlet of the oil outlet flow channel of the pump body is designed with a second circular groove for installing the oil outlet valve body of the oil outlet valve group. The oil outlet valve body is designed as a cylinder. A first circular groove is designed in the middle of the oil outlet valve body. A second circular groove is designed at the lower end of the first circular groove. The inner diameter of the second circular groove is larger than the first circular groove. The lower end of the second circular groove is connected to the lower end surface of the oil outlet valve body. A plurality of arc-shaped grooves are designed around the upper end of the oil outlet valve body. The upper end of the arc-shaped groove is connected to the upper end surface of the oil outlet valve body, and the bottom of the arc-shaped groove is connected to the upper end of the first circular groove. The annular valve seat is installed In the second circular groove, the inner diameter of the annular valve seat is smaller than that of the first circular groove, and the oil outlet valve plate is slidably installed in the first circular groove, and the end face of the oil outlet valve plate is sealed with the upper end face of the annular valve seat; the oil outlet valve group also includes an oil outlet conical spring, and an annular protrusion is designed on the upper end of the annular valve seat, the annular protrusion extends into the first circular groove for a distance and an annular groove is formed between the annular protrusion and the first circular groove, the oil outlet conical spring is located in the first circular groove, the thin end of the oil outlet conical spring is pressed against the oil outlet valve plate, and the thick end of the oil outlet conical spring is pressed against the bottom of the first circular groove; the lower end face of the oil outlet valve plate is sealed with the upper end face of the annular protrusion.

9. The flow-changeable integrated high-pressure pump according to claim 8, characterized in that: The outer side of the oil outlet valve body is designed with an external thread, the inner side of the second circular groove of the pump body is designed with an internal thread, and the oil outlet valve body is installed in the second circular groove of the pump body through threaded matching.

10. The flow-changeable integrated high-pressure pump according to claim 4, characterized in that: The filter screen is designed as a basin-shaped filter screen cover, which is outside the oil inlet side of the oil suction valve group. The basin-shaped filter screen cover is fixed to the outside of the pump body through a pressure plate. The pressure plate is designed as a rectangular plate. A circular hole is opened in the middle of the rectangular plate. Bolt holes are designed at the four corners of the rectangular plate. Threaded holes are designed on the outside of the pump body corresponding to the bolt holes. The rectangular plate is sleeved on the outside of the basin-shaped filter screen cover through the circular holes and the rectangular plate is pressed on the annular flange of the basin-shaped filter screen cover. The four corners of the rectangular plate are locked in the threaded holes on the outside of the pump body by screws passing through the bolt holes.

Images