Pressure maintaining structure of high-pressure hydraulic pump

Abstract

The utility model discloses a kind of high-pressure hydraulic pump pressure maintaining structure, belong to hydraulic pump pressure maintaining technical field.The utility model includes the first valve block and the second valve block being connected with each other, the first valve block is equipped with pressure maintaining circuit inside, the second valve block is equipped with the intercepting component for carrying out on-off to pressure maintaining circuit;The intercepting component includes conversion head and driving rod;Wherein, the conversion head has a through flow-through cavity, and one end of the flow-through cavity is connected with pressure maintaining circuit;The circumferential of the conversion head is equipped with the pressure relief hole being communicated with flow-through cavity, and the hardness of this conversion head is greater than the hardness of first valve block;The end of the driving rod extends to flow-through cavity, for the on-off control of flow-through cavity.This utility model is transferred to the port place of flow-through cavity by the setting of conversion head, can the instantaneous high pressure received at pressure maintaining circuit port place;At this time, the material of conversion head can be optimized alone, and the material of entire valve block need not be optimized.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic pump pressure holding technology, and more specifically, relates to a pressure holding structure for a high-pressure hydraulic pump. Background Technology

[0002] The core of a high-pressure / ultra-high-pressure hydraulic pump is to convert the mechanical energy of a power source such as an electric motor into the pressure energy of hydraulic oil. Although the core moving parts of different types of high-pressure hydraulic pumps differ slightly—for example, piston pumps use pistons as the core moving part, while gear pumps use gears or vanes—the overall working principle is basically the same: the motor drives the core moving part inside the pump to rotate, creating multiple periodically changing sealed spaces within the pump. When the volume of a sealed space increases, the internal pressure decreases, and hydraulic oil in the tank is drawn in under atmospheric pressure. Subsequently, the volume of the sealed space decreases, the oil is squeezed, and the pressure rises sharply. Finally, the high-pressure oil is delivered to the hydraulic system through the outlet to power actuators such as cylinders and hydraulic motors.

[0003] In the operation of high-pressure hydraulic systems, pressure holding is necessary to maintain the stable working state of actuators, reduce system energy consumption, protect precision components, and ensure process accuracy. Pressure holding refers to the process of maintaining the system pressure within the set range once the high-pressure hydraulic system pressure reaches the required set value. This is achieved by using specialized devices such as pressure holding valves and conical plunger seals to block leakage or backflow of high-pressure oil in the oil circuit. Therefore, ensuring the sealing effect of the pressure holding circuit is a crucial prerequisite for improving the pressure holding performance.

[0004] For example, patent CN221525039U discloses an ultra-high pressure hydraulic pump with automatic pressure adjustment and holding. In this application, the oil outlet is connected to an output device (hydraulic tensioning device, hydraulic torque wrench, or other hydraulic actuator) via a pipeline. The pressure relief module remains closed. The controller drives the motor, which in turn controls the hydraulic pump body to operate. The pressure adjustment module is activated to adjust the pressure of the hydraulic pump body. When the pressure sensor detects that the pressure value of the hydraulic pump body has reached the preset pressure target value, the pressure adjustment module stops working, and the hydraulic pump body is in a pressure holding state.

[0005] For example, patent CN209085755U discloses an automatic pressure-holding device and a hydraulic calibration system including the same. This application includes an automatic shut-off system oil circuit unit and an automatic locking unit. The automatic locking unit is mounted on the cylinder body and sleeved on the cylinder piston rod at the upper part of the cylinder body. The automatic shut-off system oil circuit unit is installed at the oil inlet of the cylinder body and is used to automatically shut off the hydraulic oil in the oil circuit after the system stops pressurizing.

[0006] For example, patent CN208804063U discloses a pressure-holding control structure for a hydraulic pump station. This application includes a pressure-holding template, within which an oil outlet pipe and a control pipe are arranged side-by-side. The control pipe has a mirror-image L-shape. A transverse overflow pipe is connected to the port of the oil outlet pipe extending into the inner side of the pressure-holding template. A plug is installed at one end of the overflow pipe, a spring is installed on one side of the plug, a ball valve plug is installed on one side of the spring, and an oil inlet pipe is installed on the other side of the ball valve plug. The ball valve plug is located at the junction of the overflow pipe and the oil inlet pipe, used to control the connection and disconnection of the two pipes.

[0007] The aforementioned applications all involve improvements to the pressure-holding technology of high-pressure hydraulic pumps, and have achieved certain results. However, the applicants have found that in existing high-pressure hydraulic systems, the sealing performance at the outlet of the pressure-holding circuit gradually declines after prolonged operation, thus affecting the pressure-holding effect. Therefore, the industry still needs more diverse and sophisticated designs to further improve the stability of the sealing performance of the pressure-holding circuit and ensure the pressure-holding effect. Utility Model Content

[0008] The problem to be solved In view of at least some of the problems existing in the prior art, this utility model proposes a pressure holding structure for a high-pressure hydraulic pump. The purpose is to solve the problem that in existing high-pressure hydraulic systems, the sealing performance at the outlet of the pressure holding circuit will gradually decrease after long-term operation, thereby affecting the pressure holding effect.

[0009] Technical solution To solve the above problems, the technical solution adopted by this utility model is as follows: This utility model discloses a pressure-holding structure for a high-pressure hydraulic pump, comprising a first valve block and a second valve block connected to each other. The first valve block contains a pressure-holding circuit, and the second valve block contains a flow-blocking component for opening and closing the pressure-holding circuit. The flow-stopping assembly includes a conversion head and a drive rod; wherein the conversion head has a through flow cavity, one end of which is connected to the pressure-holding circuit; The conversion head has a pressure relief hole in its circumference that communicates with the flow cavity, and the hardness of the conversion head is greater than that of the first valve block. The end of the drive rod extends into the flow cavity to control the opening and closing of the flow cavity.

[0010] In some embodiments, the flow cavity includes a first cavity and a second cavity that are in communication with each other; wherein, The first cavity is used to correspond to the pressure holding circuit, and the radial dimension of the first cavity is smaller than that of the second cavity. The pressure relief hole is opened on the peripheral wall of the second cavity. The end of the drive rod is provided with a blocking part for controlling the opening and closing of the first cavity.

[0011] In some embodiments, the radial dimension of the first cavity is smaller than the radial dimension of the end of the pressure-holding circuit, and the plug is generally a conical structure.

[0012] In some embodiments, a first mounting hole and a second mounting hole are respectively provided at the relative positions of the mating surfaces of the first valve block and the second valve block, and the central axes of the two mounting holes coincide with each other; wherein, The adapter head is disposed in the first mounting hole, and the drive rod is disposed in the second mounting hole.

[0013] In some embodiments, the drive rod includes an interconnected rod body and a piston head; wherein, The blocking part is located at the end of the rod away from the piston head, and an oil cavity is formed between the piston head and the inner end wall of the second mounting hole.

[0014] In some embodiments, the drive rod and the second mounting hole are threadedly connected, and the free end of the drive rod extends to the outside of the second valve block and is connected to a rotating handle.

[0015] In some embodiments, the first valve block is provided with a first oil inlet pipe, a second oil inlet pipe, and a pressure relief pipe; wherein, the first oil inlet pipe is used to pump high-pressure oil into the pressure holding circuit; the second oil inlet pipe is used to pump low-pressure oil into the oil chamber; and the pressure relief pipe is connected to the second chamber through a pressure relief hole. The second valve block is equipped with a solenoid valve for controlling the connection and disconnection between the second oil inlet pipe and the oil chamber.

[0016] In some embodiments, the adapter is threaded to the first mounting hole, and the end of the adapter extends into the second mounting hole and is connected to a positioning ring. A return spring is fitted onto the rod body, and the return spring is confined between the piston head and the conversion head.

[0017] In some embodiments, a seal is provided between the piston head and the inner wall of the second mounting hole, and at the mating surface between the first valve block and the second valve block.

[0018] In some embodiments, the first valve block is provided with a pressure gauge and a pressure regulating valve, wherein the oil inlets of the pressure gauge and the pressure regulating valve are both connected to the pressure holding circuit through channels.

[0019] Beneficial effects Compared with the prior art, the beneficial effects of this utility model are as follows: (1) The pressure holding structure of the high-pressure hydraulic pump of this utility model is configured with a conversion head, the flow chamber of which is connected to the pressure holding circuit. This design can transfer the instantaneous high pressure at the port of the pressure holding circuit to the port of the flow chamber. At this time, the material of the conversion head can be optimized separately without optimizing the material of the entire valve block. At the same time, the conversion head can also be replaced separately after it is damaged.

[0020] (2) The pressure holding structure of the high pressure hydraulic pump of this utility model optimizes the structure of the flow-stopping component. During the pressure holding operation, the first cavity can be sealed once by the blocking part; the second cavity can be sealed twice by the driving rod, thereby further improving the sealing effect and ensuring the pressure holding effect.

[0021] (3) In the pressure holding structure of the high pressure hydraulic pump of this utility model, the radial dimension of the first cavity is smaller than the radial dimension of the end of the pressure holding circuit, and the entire blocking part is a conical structure; this design can effectively reduce the resistance that the blocking part has to overcome when blocking the first cavity, thus making the blocking operation of the blocking part more favorable.

[0022] (4) The pressure holding structure of the high pressure hydraulic pump of this utility model can effectively ensure the concentricity accuracy between the first mounting hole and the second mounting hole by setting the positioning ring, and prevent radial offset, thereby affecting the assembly operation between the drive rod and the conversion head. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the pressure-holding structure of a high-pressure hydraulic pump according to the present invention; Figure 2 This is a schematic diagram of the internal structure of a high-pressure hydraulic pump pressure-holding structure according to the present invention; Figure 3 This is a schematic diagram of the flow-blocking component in this utility model; Figure 4 for Figure 2 A magnified view of a portion of point A in the middle; Figure 5 This is a schematic diagram of the internal structure of the converter head in this utility model.

[0024] In the picture: 100, First valve block; 110, Pressure holding circuit; 120, First mounting hole; 130, First oil inlet pipe; 140, Second oil inlet pipe; 150, Pressure relief pipe; 160, Outlet pipe; 200, Second valve block; 210, Second mounting hole; 220, Oil chamber; 300. Interception component; 310. Converter head; 311. Flow chamber; 3111. First chamber; 3112. Second chamber; 320. Drive rod; 321. Rod body; 322. Piston head; 330. Blocking part; 340. Positioning ring; 350. Return spring; 360. Solenoid valve; 400, pressure gauge; 500, pressure regulating valve. Detailed Implementation

[0025] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings.

[0026] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] As mentioned in the background section, existing high-pressure hydraulic systems typically maintain pressure by sealing the pressure-holding circuit. However, during the sealing and pressure-holding process, the ends of the pressure-holding circuit are subjected to significant instantaneous oil pressure. Over time, this can easily lead to minute deformations at the ports, affecting their sealing performance and reducing the pressure-holding effect.

[0028] To address the aforementioned issues, the most effective approach would be to increase the strength of the pressure-holding circuit's end to reduce the risk of deformation. However, in practice, the pressure-holding circuit is typically located within the distribution valve. Increasing the strength of the pressure-holding circuit's end would mean increasing the strength of the entire distribution valve, which is clearly not cost-effective.

[0029] Therefore, this utility model proposes a pressure-holding structure for a high-pressure hydraulic pump, which aims to reduce the risk of deformation at the end of the pressure-holding circuit due to prolonged high pressure while minimizing costs, and to ensure the reliability of the seal during pressure holding.

[0030] The present invention will be further described below with reference to specific embodiments.

[0031] like Figure 1 , 2 As shown, a pressure-holding structure for a high-pressure hydraulic pump in this embodiment includes a first valve block 100 and a second valve block 200 connected to each other. The first valve block 100 has a pressure-holding circuit 110; the second valve block 200 has a flow-blocking component 300 for opening and closing the pressure-holding circuit 110.

[0032] Specifically, refer to Figure 3 , Figure 4 As shown, the flow-stopping assembly 300 includes a conversion head 310 and a drive rod 320. The conversion head 310 has an axially extending flow cavity 311, one end of which is connected to the pressure-holding circuit 110, and the hardness of the conversion head 310 is greater than the hardness of the first valve block 100.

[0033] Meanwhile, a pressure relief hole (not shown in the figure) communicating with the flow cavity 311 is provided circumferentially on the converter head 310. The end of the drive rod 320 extends into the flow cavity 311 to control the opening and closing of the flow cavity 311.

[0034] This embodiment of a high-pressure hydraulic pump pressure-holding structure utilizes the flow chamber 311 of the converter head 310 to connect with the pressure-holding circuit 110. This design allows the instantaneous high pressure received at the port of the pressure-holding circuit 110 to be transferred to the port of the flow chamber 311. In this case, the material of the converter head 310 can be optimized separately without optimizing the material of the entire first valve block 100; furthermore, if the converter head 310 is damaged, it can be replaced separately, thus contributing to cost savings.

[0035] like Figure 4 As shown in some embodiments, a first mounting hole 120 and a second mounting hole 210 are respectively provided at the relative positions of the mating surfaces of the first valve block 100 and the second valve block 200, and the central axes of the two mounting holes coincide with each other. The adapter 310 is disposed within the first mounting hole 120, and the drive rod 320 is disposed within the second mounting hole 210. Of course, a sealing element must be provided at the mating surfaces of the first valve block 100 and the second valve block 200 to seal the interface between the first mounting hole 120 and the second mounting hole 210.

[0036] In some alternative implementations, refer to Figure 4 , Figure 5 As shown, the flow chamber 311 includes a first chamber 3111 and a second chamber 3112 that are interconnected. One end of the first chamber 3111 is sealed to the outlet end of the pressure holding circuit 110, and the radial dimension of the first chamber 3111 is smaller than that of the second chamber 3112. The end of the drive rod 320 is provided with a blocking part 330 for controlling the opening and closing of the first chamber 3111 to realize the switching action between pressure holding and pressure relief operations.

[0037] Furthermore, such as Figure 1As shown, a pressure relief hole is located on the peripheral wall of the second cavity 3112, through which the second cavity 3112 is connected to a pressure relief pipe 150. Simultaneously, the first valve block 100 is also equipped with a first oil inlet pipe 130 and an outlet pipe 160. The first oil inlet pipe 130 is used to pump high-pressure oil into the pressure holding circuit 110; the outlet pipe 160 is used to connect external equipment, such as a hydraulic wrench or hydraulic tensioner.

[0038] In addition, to facilitate precise control of the oil pressure within the system, a pressure gauge 400 and a pressure regulating valve 500 are provided on the first valve block 100 in this embodiment. The oil inlets of both the pressure gauge 400 and the pressure regulating valve 500 are connected to the pressure holding circuit 110 via channels. It should be noted that both the pressure gauge 400 and the pressure regulating valve 500 can utilize existing technology, and their specific structures and working principles are not described in detail here.

[0039] In this embodiment of a high-pressure hydraulic pump pressure-holding structure, to further improve the sealing performance during pressure holding, in some implementations, the drive rod 320 and the second cavity 3112 are also connected in a sealed manner. Simultaneously, when the blocking part 330 moves with the drive rod 320 and completes the sealing of the first cavity 3111, the drive rod 320 will cover the pressure relief hole and simultaneously seal the second cavity 3112.

[0040] In this embodiment, the first cavity 3111 is sealed once by the plugging part 330, and the second cavity 3112 is sealed a second time by the driving rod 320, thereby forming a double sealing effect. With this design, even if the seal of the plugging part 330 fails, it can still be sealed by the driving rod 320, thereby effectively improving the sealing effect and ensuring the pressure holding effect.

[0041] It is easy to understand that during the pressure holding operation, the blockage part 330 needs to overcome a large pressure, especially when the pressure holding valve needs to be manually rotated, the locking operation is time-consuming and laborious.

[0042] Therefore, in some alternative embodiments, the radial dimension of the first cavity 3111 is smaller than the radial dimension of the end of the pressure holding circuit 110. Preferably, the blocking part 330 is a conical structure. This design can effectively reduce the resistance that the blocking part 330 has to overcome when blocking the first cavity 3111, thereby making the blocking operation of the blocking part 330 more convenient.

[0043] Meanwhile, it should be noted that to prevent the drive rod 320 from encountering significant resistance during movement, a clearance fit can be used between the drive rod 320 and the second cavity 3112, meaning a sealed fit is not required. Thus, when the blocking part 330 completes the sealing of the first cavity 3111, since the drive rod 320 does not form a sealed space in the second cavity 3112, excess hydraulic oil in the second cavity 3112 will be discharged through the pressure relief port, thereby not hindering the movement of the drive rod 320. In other words, during the pressure holding process, only the single seal of the blocking part 330 is used, and the aforementioned double seal is not formed.

[0044] As one driving method for the drive rod 320, the drive rod 320 and the second mounting hole 210 can be connected by a conventional thread, and the free end of the drive rod 320 extends to the outside of the second valve block 200 and is connected to a rotary handle (not shown in the figure). By rotating the rotary handle, the drive rod 320 and the plug 330 are moved through the threaded transmission.

[0045] As another drive form of the drive lever 320, refer to Figure 1 , Figure 3 As shown, the drive rod 320 includes a rod body 321 and a piston head 322 connected to each other. A plug 330 is located at the end of the rod body 321 away from the piston head 322; an oil cavity 220 is formed between the piston head 322 and the inner end wall of the second mounting hole 210. Of course, a seal must be provided between the piston head 322 and the inner end wall of the second mounting hole 210 to ensure the sealing performance of the oil cavity 220.

[0046] Meanwhile, the oil chamber 220 is connected to a second oil inlet pipe 140, which is used to pump low-pressure oil into the oil chamber 220, thereby generating power to drive the piston head 322 to move. Preferably, the second valve block 200 is provided with a solenoid valve 360, which is used to control the opening and closing of the second oil inlet pipe 140 and the oil chamber 220.

[0047] In some alternative embodiments, the adapter 310 is threadedly connected to the first mounting hole 120, and the second cavity 3112 of the adapter 310 is an internal hexagonal hole. Simultaneously, the end of the adapter 310 extends into the second mounting hole 210 and is connected to a positioning ring 340, which is radially confined within the second mounting hole 210.

[0048] In this embodiment, the positioning ring 340 can effectively ensure the concentricity accuracy between the first mounting hole 120 and the second mounting hole 210, preventing radial offset and thus affecting the assembly operation between the drive rod 320 and the conversion head 310.

[0049] Furthermore, a return spring 350 is sleeved on the rod body 321. The return spring 350 is limited between the piston head 322 and the conversion head 310 and is used to reset the drive rod 320 after the pressure holding is completed.

[0050] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A pressure-holding structure for a high-pressure hydraulic pump, comprising a first valve block (100) and a second valve block (200) connected to each other, wherein the first valve block (100) is provided with a pressure-holding circuit (110), and the second valve block (200) is provided with a flow-blocking component (300) for switching the pressure-holding circuit (110) on and off, characterized in that: The flow-blocking assembly (300) includes a conversion head (310) and a drive rod (320); wherein the conversion head (310) has a through flow cavity (311), one end of which is connected to the pressure-holding circuit (110); The conversion head (310) is provided with a pressure relief hole in the circumferential direction that communicates with the flow cavity (311), and the hardness of the conversion head (310) is greater than that of the first valve block (100). The end of the drive rod (320) extends into the flow cavity (311) to control the opening and closing of the flow cavity (311).

2. The pressure-holding structure of a high-pressure hydraulic pump according to claim 1, characterized in that: The flow cavity (311) includes a first cavity (3111) and a second cavity (3112) that are interconnected; wherein, The first cavity (3111) is used to correspond to the pressure holding circuit (110), and the radial dimension of the first cavity (3111) is smaller than that of the second cavity (3112). The pressure relief hole is opened on the peripheral wall of the second cavity (3112). The end of the drive rod (320) is provided with a plug (330) for controlling the opening and closing of the first cavity (3111).

3. The pressure-holding structure of a high-pressure hydraulic pump according to claim 2, characterized in that: The radial dimension of the first cavity (3111) is smaller than the radial dimension of the end of the pressure holding circuit (110), and the blocking part (330) is a conical structure as a whole.

4. A pressure-holding structure for a high-pressure hydraulic pump according to claim 2 or 3, characterized in that: The first valve block (100) and the second valve block (200) are respectively provided with a first mounting hole (120) and a second mounting hole (210) at the relative positions of their mating surfaces, and the central axes of the two mounting holes coincide with each other; wherein, The adapter (310) is disposed in the first mounting hole (120), and the drive rod (320) is disposed in the second mounting hole (210).

5. The pressure-holding structure of a high-pressure hydraulic pump according to claim 4, characterized in that: The drive rod (320) includes a rod body (321) and a piston head (322) connected to each other; wherein, The blocking part (330) is located at the end of the rod (321) away from the piston head (322), and an oil cavity (220) is formed between the piston head (322) and the inner end wall of the second mounting hole (210).

6. The pressure-holding structure of a high-pressure hydraulic pump according to claim 4, characterized in that: The drive rod (320) is threadedly fitted with the second mounting hole (210), and the free end of the drive rod (320) extends to the outside of the second valve block (200) and is connected to a rotating handle.

7. The pressure-holding structure of a high-pressure hydraulic pump according to claim 5, characterized in that: The first valve block (100) is provided with a first oil inlet pipe (130), a second oil inlet pipe (140), and a pressure relief pipe (150); wherein, the first oil inlet pipe (130) is used to pump high-pressure oil into the pressure holding circuit (110); the second oil inlet pipe (140) is used to pump low-pressure oil into the oil chamber (220); the pressure relief pipe (150) is connected to the second chamber (3112) through a pressure relief hole; The second valve block (200) is equipped with a solenoid valve (360) for controlling the opening and closing of the second oil inlet pipe (140) and the oil chamber (220).

8. The pressure-holding structure of a high-pressure hydraulic pump according to claim 5, characterized in that: The adapter (310) is threadedly connected to the first mounting hole (120), and the end of the adapter (310) extends into the second mounting hole (210) and is connected to a positioning ring (340). A return spring (350) is fitted on the rod (321), and the return spring (350) is limited between the piston head (322) and the conversion head (310).

9. The pressure-holding structure of a high-pressure hydraulic pump according to claim 8, characterized in that: A seal is provided between the piston head (322) and the inner wall of the second mounting hole (210), and at the mating surface between the first valve block (100) and the second valve block (200).

10. A pressure-holding structure for a high-pressure hydraulic pump according to claim 9, characterized in that: The first valve block (100) is equipped with a pressure gauge (400) and a pressure regulating valve (500), wherein the oil inlets of the pressure gauge (400) and the pressure regulating valve (500) are connected to the pressure holding circuit (110) through channels.

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