Hydraulic impulse generator and test bench

Abstract

The application provides a hydraulic pulse generator and a test bench. The hydraulic pulse generator provided by the embodiment of the application comprises a rotating body and a shell. The rotating body is accommodated in a first accommodating cavity in the shell. The shell and the rotating body are connected through relative rotation. The shell and the rotating body form first distribution oil paths and second distribution oil paths with different pressures, which are connected alternately. The shell is provided with at least one pulse output port for connecting the tested element, which can be connected to the first distribution oil paths and the second distribution oil paths. Therefore, the pulse frequency and the test pressure of the hydraulic pulse generator provided by the application can be set according to requirements. At least one tested element can be installed in one test, the service life is long, and the price is low.

Description

Technical Field

[0001] The present application relates to the field of hydraulic component testing technology, and in particular to a hydraulic pulse generator and a test bench. Background Art

[0002] In the pressure holding test, hydraulic components usually use hydraulic pulse generating devices in the form of hydraulically controlled solenoid directional valves, solenoid directional valves plus booster cylinders and servo valves.

[0003] The existing technology usually has the following problems: low pulse frequency, low test pressure, short life, few test components that can be installed in one test, high price and so on.

[0004] In order to overcome the defects of the existing technology, it is necessary to develop a new pulse generator to meet the requirements of the pressure holding test of hydraulic components. Summary of the Invention

[0005] In view of the above reasons, the embodiments of the present application are committed to providing a hydraulic pulse generator and test bench to solve at least one of the problems existing in the current pressure element testing test, such as the low pulse frequency of the pulse generator, low test pressure, short life, few test elements that can be installed in one test, and high price.

[0006] In a first aspect, a hydraulic pulse generator is provided, which includes: a housing and a rotating body accommodated in the housing and capable of rotating relative to the housing, a pulse output port being provided on the housing, a first distribution oil circuit and a second distribution oil circuit with unequal pressures being formed between the housing and the rotating body, wherein, when the housing and the rotating body rotate relative to each other, the pulse output port alternately switches between a first working state connected to the first distribution oil circuit and a second working state connected to the second distribution oil circuit.

[0007] Furthermore, the first distribution oil circuit and the second distribution oil circuit respectively include a first flow channel and a second flow channel circumferentially spaced apart from each other and arranged on the rotating body, and the pulse output port is connected to the first flow channel in the first working state and is connected to the second flow channel in the second working state.

[0008] Furthermore, the number of the first flow channels is equal to the number of the second flow channels.

[0009] Furthermore, the number of the pulse output ports is different from the number of the first flow channels and the second flow channels.

[0010] Furthermore, the number of the pulse output ports differs from the number of the first flow channels and the second flow channels by one.

[0011] Furthermore, the number of the pulse output ports is one more than the number of the first flow channels and the second flow channels.

[0012] Furthermore, a fluid inlet is provided on the shell, a first annular groove communicating with the first flow channel is formed on the rotating body, and the fluid inlet is communicated with the first annular groove.

[0013] Furthermore, one end of the pulse output port close to the inner wall of the shell is set as a radial distribution hole.

[0014] Furthermore, the radial distribution hole is a waist-shaped hole.

[0015] Furthermore, the first flow channel 21 is provided with a V-shaped groove at a position corresponding to the radial distribution hole.

[0016] Furthermore, a fluid outlet is provided on the shell, a second annular groove communicating with the second flow channel is formed on the rotating body, and the fluid outlet is communicated with the second annular groove.

[0017] Furthermore, the fluid outlet is provided at a position on the housing axially corresponding to the second annular groove.

[0018] Furthermore, an axially extending rotating body inner cavity is formed in the rotating body, and the rotating body inner cavity is communicated with the gap between the shell and the rotating body, and is communicated with the second annular groove.

[0019] Furthermore, the fluid outlet is provided at a position on the housing corresponding to the opening of the inner cavity of the rotating body.

[0020] Furthermore, the rotating body includes a driving end extending from the shell, the shell includes a shell body and an end cover fixed to the shell body on a side away from the driving end, the inner cavity of the rotating body is configured as a blind hole opening toward the end cover, the blind hole is connected to the second annular groove via a first through hole penetrating the side wall of the inner cavity of the rotating body, and a gap is provided between the end surface of the rotating body facing the end cover and the end cover.

[0021] Furthermore, the fluid outlet is provided at a position on the end cover corresponding to the opening of the inner cavity of the rotating body.

[0022] Furthermore, the rotating body is provided with a shoulder facing the inner wall of the shell, and a support member is provided between the shoulder and the inner wall of the shell, and the rotating body includes a second through hole penetrating the inner cavity side wall of the rotating body and leading to the support member.

[0023] Furthermore, the pulse output port is used to connect to a component to be tested.

[0024] In a second aspect, a hydraulic pulse generator is provided, which comprises:

[0025] A housing and a rotating body accommodated in the housing and rotatable relative to the housing, the housing being provided with a pulse output port, a fluid inlet and a fluid outlet, the rotating body being formed with a first flow channel in communication with the fluid inlet and a second flow channel in communication with the fluid outlet, the pulse output port being switched between a first working state in communication with the first flow channel and a second working state in communication with the second flow channel alternately when the rotating body rotates.

[0026] Further, the pulse output port is provided with a radial port hole at one end close to the inner wall of the housing.

[0027] Further, the radial port hole is a waist-shaped hole.

[0028] Further, the first flow channel is provided with a V-shaped groove at a position corresponding to the radial port hole.

[0029] In a third aspect, a hydraulic pulse test bench is provided, which comprises the hydraulic pulse generator described above, the hydraulic pulse generator being provided with a fluid inlet and a fluid outlet;

[0030] A to-be-tested element connected to the pulse output port;

[0031] A driving unit for driving the rotating body;

[0032] A pressure source connected to the fluid inlet; and

[0033] An oil tank connected to the fluid outlet.

[0034] In the embodiments of the present application, by accommodating the rotating body in the first accommodating cavity inside the housing, the housing and the rotating body are connected by relative rotation, so that the housing and the rotating body form first and second distribution oil paths with different pressures that are connected alternately, wherein the housing is provided with at least one pulse output port for connecting the to-be-tested element, which can select the first and second distribution oil paths. Therefore, the hydraulic pulse generator provided by the present application can set the pulse frequency and test pressure according to the requirements, install at least one to-be-tested element at a time, has a long service life and a low price. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is a schematic diagram of the overall structure of a hydraulic pulse generator provided by the embodiments of the present application.

[0036] Figure 2 is a schematic diagram of the overall structure of a hydraulic pulse generator provided by the embodiments of the present application. Figure 1 is a schematic diagram of the overall structure of a hydraulic pulse generator provided by the embodiments of the present application.

[0037] Figure 3 is a C-C sectional view of Figure 2

[0038] Figure 4 is a B-B sectional view of Figure 2

[0039] Figure 5 is a D-D sectional view of Figure 2

[0040] Figure 6 is an E-E sectional view of Figure 2

[0041] Figure 7 is a structure diagram of one rotating body in Figure 1

[0042] Figure 8 is an A1-A1 sectional view of Figure 7

[0043] Figure 9 is a B1-B1 sectional view of Figure 7

[0044] Figure 10 is a C1-C1 sectional view of Figure 9

[0045] Figure 11 is a structure diagram of another rotating body in Figure 1

[0046] Figure 12 is one form of the differential tooth type port matching relationship between the shell and the rotating body in Figure 1

[0047] Figure 13 is a second form of the differential tooth type port matching relationship between the shell and the rotating body in Figure 1

[0048] Figure 14 is a third form of the differential tooth type port matching relationship between the shell and the rotating body in Figure 1

[0049] Figure 15 is a structure diagram of one shell in Figure 1

[0050] Figure 16 is an A2-A2 sectional view of Figure 15

[0051] Figure 17 is a B2-B2 sectional view of Figure 16

[0052] Figure 18 ​​​​​​​​​​​​​​​is a principle schematic view of a hydraulic pulse test bench provided by an embodiment of the present application.

[0053] Figure 19 is a sectional view of another hydraulic pulse generator provided by an embodiment of the present application.

[0054] Figure 20 is Figure 19 is a sectional view of the hydraulic pulse generator in

[0055] Figure 21 is Figure 19 is a sectional view of the hydraulic pulse generator in DETAILED DESCRIPTION

[0056] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0057] In order to describe the present application in more detail, the following will be described with reference to the drawings in the embodiments of the present application. Figures 1-18 A hydraulic pulse generator is described in detail.

[0058] The hydraulic pulse generator comprises a shell 1 and a rotating body 2 accommodated in the shell 1 and capable of rotating relative to the shell 1, the shell 1 is provided with a pulse output port 11, and a first distribution oil path and a second distribution oil path with different pressures are formed between the shell 1 and the rotating body 2. When the shell 1 and the rotating body 2 rotate relative to each other, the pulse output port 11 is switched between a first working state of communicating with the first distribution oil path and a second working state of communicating with the second distribution oil path. The pulse output port 11 is used to connect a to-be-tested element.

[0059] In this way, the pulse output port 11 alternately outputs high pressure and low pressure, so that the to-be-tested element can be directly connected to the pulse output port 11, and the direct switching between the high pressure output and the low pressure output from the pulse output port 11 can be realized by rotating the rotating body 2, instead of the pulsating pressurization of the traditional generator, i.e. pressurization, unloading, and pressurization again. The existing generator using pulsating pressurization uses the mode of pressurization, unloading, pressurization again, and unloading again, which limits the pulse frequency and the pressure. The hydraulic pulse generator provided by the present application can set the pulse frequency and the test pressure according to requirements, at least one to-be-tested element can be installed for one test, the structure is compact, the service life is long, and the price is low. The adjustment of the pulse frequency can be realized by adjusting the rotating speed of the rotating body 2 and the number of the first distribution oil path and the second distribution oil path arranged between the rotating body 2 and the shell 1.

[0060] It is understood that the "high pressure" and "low pressure" mentioned in this specification are relative and do not limit the specific pressure range. As long as there is a pressure difference, there must be a relative "high pressure" and a relative "low pressure".

[0061] Preferably, the first and second oil distribution circuits respectively comprise a first flow channel 21 and a second flow channel 22, spaced circumferentially from each other, disposed on the rotor 2. The pulse output port 11 communicates with the first flow channel 21 in the first operating state and with the second flow channel 22 in the second operating state. This arrangement allows switching between the first and second oil distribution circuits by driving the rotor 2 and housing 1 in relative rotation, thereby outputting pulses at the pulse output port 11. For example, when the pulse output port 11 is connected to a device under test (DUT), in the first operating state, the pressure in the DUT is equal to the first pressure in the first flow channel 21. Subsequently, after the rotor 2 rotates to the second operating state, the pressure in the DUT is equal to the second pressure in the second flow channel 22, thereby applying a pulse force to the DUT. The pulse frequency can be varied by adjusting the rotational speed of the rotor 2 and the number of first and second flow channels 21, 22 disposed on the rotor 2. This makes pulse frequency adjustment easier and allows for a higher pulse frequency than in conventional systems. The structure is simple, and production and maintenance costs are low.

[0062] Preferably, the number of the first flow channels 21 is equal to the number of the second flow channels 22. This arrangement allows the first distribution oil passages and the second distribution oil passages to be alternately connected when the rotating body 2 and the housing 1 rotate relative to each other.

[0063] Preferably, the number of the pulse output ports 11 is different from the number of the first flow channels 21 and the second flow channels 22. Figure 4 As shown, by providing multiple pulse output ports 11, multiple components under test can be installed correspondingly. A single installation allows for simultaneous testing of multiple components under test. Furthermore, the hydraulic pulse generator is compact, easy to install and debug, and has low maintenance costs. By setting the number of pulse output ports 11 to be different from the number of first flow channels 21 and second flow channels 22, the pressure curves of different pulse output ports 11 are separated, facilitating observation of the pressure curve of each pulse output port 11.

[0064] Preferably, the number of the pulse output ports 11 differs from the number of the first flow channels 21 and the second flow channels 22 by one. The ratio of the number of the first flow channels 21 or the second flow channels 22 to the number of the pulse output ports 11 can be, for example, 4 / 3, 5 / 4, 6 / 5, 7 / 6, 8 / 7, 9 / 8, or can be 3 / 4, 4 / 5, 5 / 6, 6 / 7, 7 / 8, 8 / 9, etc.Figure 4 , so as to further ensure that the pressure curves of different pulse outlets 11 are separated from each other, and avoid that two or more pulse outlets 11 are simultaneously communicated with the first flow channel 21 or two or more pulse outlets 11 are simultaneously communicated with the second flow channel 22, so as to cause that the predetermined pressure cannot be provided and the pressure curves of the pulse outlets 11 cannot be distinguished.

[0065] Preferably, the number of the pulse outlets 11 is more than the number of the first flow channel 21 and the number of the second flow channel 22. In this way, the pressure curves of different pulse outlets 11 can be separated from each other as much as possible, and as many pulse outlets 11 as possible can be arranged to simultaneously measure more elements to be measured.

[0066] Preferably, a fluid inlet 12 is arranged on the shell 1, a first annular groove 23 communicated with the first flow channel 21 is formed on the rotating body 2, and the fluid inlet 12 is communicated with the first annular groove 23. As shown in Figure 3 , by arranging the first annular groove 23, different first flow channels 21 make the pulse outlets 11 and the fluid inlet 12 communicated through the first annular groove 23, so that the fluid inlet 12 outputs pressure to different elements to be measured.

[0067] Preferably, a fluid outlet 13 is arranged on the shell 1, a second annular groove 24 communicated with the second flow channel 22 is formed on the rotating body 2, and the fluid outlet 13 is communicated with the second annular groove 24. As shown in Figure 2 , by arranging the second annular groove 24, different second flow channels 22 make the pulse outlets 11 and the fluid outlet 13 communicated through the second annular groove 24, so that the pressure in the element to be measured is reduced through the fluid outlet 13. In this way, when the pulse outlets 11 are alternately communicated with the fluid outlet 13 and the fluid inlet 12, the pulse outlets 11 output pulse pressure.

[0068] Preferably, the fluid outlet 13 is arranged at a position corresponding to the second annular groove 24 in the axial direction of the shell 1. In this way, the processing is simple, the structure is compact, and the pressure loss can be reduced.

[0069] Preferably, referring to Figure 4 , one end of the pulse outlet 11 close to the inner wall of the shell 1 is arranged as a radial port 111. The radial port 111 can control the pressure rising curve and the pressure falling curve, so as to meet the reasonable application requirements of different parts, different materials and different tests.

[0070] In order to meet the reasonable application requirements of different parts, different materials and different tests, the radial port 111 can be arranged in various forms, such as Figures 12-14 , as shown in Figure 12 , the radial port 111 is circular.Figure 14 The radial distribution holes 111 on the housing 1 are long, waist-shaped holes with two axially extending sides. By connecting and disconnecting with the first flow channel 21 / second flow channel 22 via their longer sides, a larger flow area is achieved upon initial connection, and a larger connection area is used for abrupt disconnection. This allows for steeper pressure rise and fall curves at each pulse output port 11, resulting in more sensitive response. Figure 13 The first flow channel 21, which serves as the high-pressure distribution groove on the rotor 2, is narrowed. V-shaped grooves 211 are formed on both sides of the first flow channel 21. These V-shaped grooves 211 are symmetrically arranged in a double V-shape, allowing the corners of the V to gradually connect and disconnect, resulting in a gentler pressure rise and fall curve. The length of the waist-shaped hole and the angle of the double V-shaped grooves 211 can be adjusted according to test requirements to meet the appropriate application requirements of different parts, materials, and tests.

[0071] Preferably, an axially extending rotor cavity 15 is formed in the rotor 2. The rotor cavity 15 communicates with the gap between the housing 1 and the rotor 2 and with the second annular groove 24. Thus, the rotor cavity 15 can serve as a storage space to store, for example, oil leaking from the housing 1 and the rotor 2 and return it to the fluid outlet 13.

[0072] Preferably, the fluid outlet 13 is provided at a position on the housing 1 corresponding to the opening of the inner cavity 15 of the rotor. Figures 2-3 As shown, the fluid outlet 13 is connected to the inner cavity 15 of the rotor through the first through hole 26, which makes the structure very compact.

[0073] Preferably, the rotor 2 includes a driving end extending from the housing 1. The housing 1 includes a housing body 10 and an end cap 14 fixed to the housing body 10 on a side away from the driving end. The rotor inner cavity 15 is configured as a blind hole opening toward the end cap 14. The blind hole communicates with the second annular groove 24 via a first through hole 26 extending through the sidewall of the rotor inner cavity 15. A gap is provided between the end surface of the rotor facing the end cap 14 and the end cap 14. This gap allows fluid leaking between the contact surfaces of the housing 1 and the rotor 2 near the end cap 14 to enter the rotor inner cavity 15.

[0074] Preferably, if Figures 19-21 As shown, the fluid outlet 13 is provided on the end cover 14 at a position corresponding to the opening of the rotor inner cavity 15. The fluid outlet 13 is connected to the second flow channel 22 through the rotor inner cavity 15, the first through hole 26 and the second annular groove 24.

[0075] Preferably, the rotating body is provided with a shaft shoulder facing the inner wall of the housing, and a support 27 is arranged between the shaft shoulder and the inner wall of the housing, and the rotating body 2 comprises a second through hole 25 passing through the side wall of the rotating body inner cavity 15 to the support 27. By arranging the second through hole 25, the leaked fluid in the space where the support 27 is located can be introduced into the rotating body inner cavity 15, and then flow out from the fluid outlet 13.

[0076] Preferably, the hydraulic pulse generator comprises a sealing member 3 arranged around the driving end of the rotating body 2 and around the outer periphery of the rotating body 2, and the sealing member 3 is located at the end of the housing 1 to prevent fluid leakage between the housing 1 and the rotating body 2, thereby improving the sealing performance of the hydraulic pulse generator.

[0077] The second aspect provides a hydraulic pulse generator, comprising a housing 1 and a rotating body 2 accommodated in the housing 1 and capable of rotating relative to the housing 1, the housing 1 is provided with a pulse output port 11, a fluid inlet 12 and a fluid outlet 13, the rotating body 2 is formed with a first flow channel 21 communicating with the fluid inlet 12 and a second flow channel 22 communicating with the fluid outlet 13, and when the rotating body 2 rotates, the pulse output port 11 is switched between a first working state of communicating with the first flow channel 21 and a second working state of communicating with the second flow channel 22.

[0078] The working principle of a hydraulic pulse generator for testing hydraulic elements is described as follows, taking the ratio of the number of first flow channels 21 or second flow channels 22 to the number of pulse output ports 11 as 6 / 7 as an example.

[0079] Reference Figure 1 When the pulse output port 11 is connected to the to-be-tested element of the hydraulic element, the housing 1 of the hydraulic pulse generator comprises a housing body 10 and an end cover 14, and the rotating body 2 is driven to rotate by a motor. As shown in Figure 7As shown, the rotor 2 has a high-pressure first annular groove 23 and a low-pressure second annular groove 24. The first annular groove 23 communicates with six first flow channels 21, which are evenly distributed on the outer cylindrical surface of the rotor 2. The second annular groove 24 communicates with six second flow channels 22, which are also evenly distributed on the outer cylindrical surface of the rotor 2 and spaced apart from the six first flow channels 21. The second annular groove 24 has four first through-holes 26 that communicate with blind holes. These first through-holes 26 allow oil leaking from the pulse generator to return to the oil tank through the second annular groove 24, which is a low-pressure annular groove. The rotor 2 has a drive end extending from the housing 1. The drive end can be manufactured in the form of a flat key shaft, a semi-circular key shaft, an involute spline shaft, a T-shaped spline shaft, or a tapered shaft. The outer surface of the rotor 2 is in close contact with the inner surface of the housing 1 to minimize leakage while allowing the rotor 2 to rotate. The fluid inlet 12 and the fluid outlet 13 are arranged on the outer surface of the housing 1. The fluid inlet 12 is communicated with the high-pressure first annular groove 23 on the rotating body 2, and the fluid outlet 13 is communicated with the low-pressure second annular groove 24 on the rotating body 2. There are 7 pulse output ports 11 between the two annular grooves on the housing 1, and the pulse output ports 11 radially pass through the housing 1. The pulse output ports 11 are communicated with the 6 high-pressure first flow channels 21 and the 6 low-pressure second flow channels 22 on the rotating body 2 in a differential tooth flow distribution manner. Each pulse output port 11 can be connected to a component to be tested, wherein the component to be tested is a hydraulic component. As Figure 4As shown, due to the different distribution angles of the 6 first flow channels 21 with high-pressure oil distribution grooves and the 6 second flow channels 22 with low-pressure oil distribution grooves on the rotating body 2 and the 7 pulse output ports 11 on the shell 1, the oil distribution grooves and the pulse output ports 11 have a phase-different gear-like oil distribution relationship. When the fluid inlet 12 on the shell 1 inputs high pressure, the pressure enters the pulse output ports in communication with the first flow channels 21 through the first annular groove 23 and the 6 first flow channels 21 on the rotating body 2. At this time, 3 or 4 grooves of the first flow channels 21 are in communication with 3 or 4 of the 7 pulse output ports 11 on the shell 1, so that these pulse output ports 11 obtain high pressure. When the rotating body 2 rotates at a certain speed, each pulse output port 11 will alternately encounter the first flow channels 21 and the second flow channels 22, so that the pulse output ports 11 alternately output high pressure and low pressure as the rotating body 2 rotates. Each pulse output port 11 will encounter the 6 first flow channels 21 and the second flow channels 22 once per revolution of the rotating body 2, that is, the pulse output port 11 obtains 6 times of high pressure and low pressure. For example, if the rotating speed of the rotating body 2 is 10 revolutions per minute, each pulse output port 11 on the shell 1 will generate and release high pressure 60 times, that is, 1 time per second, and the pulse frequency is 1 Hz. This single hydraulic pulse generator can be connected with 1-7 test elements at the same time. When 7 test elements need to be tested, the 7 pulse output ports 11 can be connected with the test elements, so that multiple elements can be quickly detected. When 1 test element needs to be tested, the remaining 6 pulse output ports 11 can be plugged. The adjustment of the pulse frequency can be adjusted by adjusting the rotating speed of the input motor, which is convenient and fast, and can meet different test frequency requirements. The gap between the shell 1 and the rotating body 2 can be very small, and the test pressure can reach an ultrahigh pressure of more than 50 MPa. When different test requirements need to be met, rotating bodies 2 with different first flow channels 21 and second flow channels 22 can be used to meet different test requirements, which is simple and convenient. In addition, the overall design has small volume, compact structure, high pressure and high frequency, low cost, and is convenient to install, adjust, maintain and maintain.

[0080] The third aspect provides a hydraulic pulse test bench, as shown in Figure 18 The test bench includes the above-mentioned hydraulic pulse generator 00; a test element connected to the pulse output port 11; a driving unit (usually a motor, not shown) for driving the rotating body 2; a pressure source 5 connected to the fluid inlet 12; and an oil tank 7 connected to the fluid outlet 13; wherein the hydraulic pulse generator is provided with a fluid inlet 12 and a fluid outlet 13. The hydraulic pulse test bench has all the technical advantages of the hydraulic pulse generator 00, which will not be repeated here.

[0081] In the hydraulic pulse test bench, a pressure source 5, or pump, provides high-pressure fluid to the hydraulic pulse generator 00. A relief valve 4 is installed at the outlet of the pump 5 to limit the maximum outlet pressure of the pump 5, thereby ensuring that the inlet pressure of the hydraulic pulse generator 00 remains within the set value, thereby ensuring the normal operation of the experiment. The fluid outlet 13 of the hydraulic pulse generator 00 passes through a filter 6 and then flows to the oil tank 7. This allows the oil flowing out of the fluid outlet 13 to be filtered by the filter 6 and then re-enter the pump 5 for reuse.

[0082] It can be understood that the hydraulic pulse test bench may also include various accessories, such as stop valves, thermometers, heaters, etc., which will not be described in detail here.

[0083] It should be understood that the term "and / or" as used herein simply describes a relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A alone, A and B together, or B alone. A and B can be singular or plural. Furthermore, the character " / " as used herein generally indicates an "or" relationship between the associated objects, but it may also indicate an "and / or" relationship. For specific understanding, please refer to the context.

[0084] In this application, "at least one" means one or more, and "plurality" means two or more. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or plural.

[0085] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0086] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A hydraulic pulse generator, characterized in that: include: a housing and a rotating body, wherein the housing is provided with a pulse output port, the rotating body is capable of rotating relative to the housing, and a first distribution oil passage and a second distribution oil passage with unequal pressures are formed between the housing and the rotating body, wherein when the housing and the rotating body rotate relative to each other, the pulse output port alternately switches between a first operating state in communication with the first distribution oil passage and a second operating state in communication with the second distribution oil passage; In which, the first distribution oil circuit and the second distribution oil circuit respectively include a first flow channel and a second flow channel circumferentially spaced from each other and arranged on the rotating body, the number of the first flow channels and the second flow channels are equal, the pulse output port is connected with the first flow channel in the first working state, and is connected with the second flow channel in the second working state, and the end of the pulse output port close to the inner wall of the shell is set as a radial distribution hole.

2. The hydraulic pulse generator according to claim 1, characterized in that: The number of the pulse output ports is different from the number of the first flow channels and the second flow channels.

3. The hydraulic pulse generator according to claim 1, characterized in that: The number of the pulse output ports differs from the number of the first flow channels and the second flow channels by one.

4. The hydraulic pulse generator according to claim 1, characterized in that: The number of the pulse output ports is one more than the number of the first flow channels and the second flow channels.

5. The hydraulic pulse generator according to claim 1, characterized in that: A fluid inlet is formed on the shell, a first annular groove communicating with the first flow channel is formed on the rotating body, and the fluid inlet is communicated with the first annular groove.

6. The hydraulic pulse generator according to claim 1, characterized in that: The radial distribution hole is a waist-shaped hole.

7. The hydraulic pulse generator according to claim 1, characterized in that: The first flow channel is provided with a V-shaped groove at a position corresponding to the radial distribution hole.

8. The hydraulic pulse generator according to claim 1, characterized in that: The shell is provided with a fluid outlet, the rotating body is formed with a second annular groove communicating with the second flow channel, and the fluid outlet is communicated with the second annular groove.

9. The hydraulic pulse generator according to claim 8, characterized in that: The fluid outlet is provided at a position on the housing axially corresponding to the second annular groove.

10. The hydraulic pulse generator according to claim 8, characterized in that An axially extending rotating body cavity is formed in the rotating body. The rotating body cavity is communicated with the gap between the housing and the rotating body, and is communicated with the second annular groove.

11. The hydraulic pulse generator according to claim 10, characterized in that: The fluid outlet is provided at a position on the housing corresponding to the opening of the inner cavity of the rotor.

12. The hydraulic pulse generator according to claim 10, characterized in that: The rotating body includes a driving end extending from the shell, and the shell includes a shell body and an end cover fixed to the shell body on a side away from the driving end. The inner cavity of the rotating body is configured as a blind hole opening toward the end cover, and the blind hole is connected to the second annular groove via a first through hole penetrating the side wall of the inner cavity of the rotating body, and a gap is provided between the end surface of the rotating body facing the end cover and the end cover.

13. The hydraulic pulse generator according to claim 12, characterized in that: The fluid outlet is arranged at a position on the end cover corresponding to the opening of the inner cavity of the rotor.

14. The hydraulic pulse generator according to claim 10, characterized in that: The rotating body is provided with a shoulder facing the inner wall of the shell, and a support member is provided between the shoulder and the inner wall of the shell. The rotating body includes a second through hole penetrating the inner cavity side wall of the rotating body and leading to the support member.

15. The hydraulic pulse generator according to any one of claims 1 to 14, characterized in that: The pulse output port is used to connect to the component to be tested.

16. A hydraulic pulse generator, characterized in that: include: A shell and a rotating body accommodated in the shell and capable of rotating relative to the shell, the shell is provided with a pulse output port, a fluid inlet and a fluid outlet, a first flow channel connected to the fluid inlet and a second flow channel connected to the fluid outlet are formed on the rotating body, and when the rotating body rotates, the pulse output port alternately switches between a first working state connected to the first flow channel and a second working state connected to the second flow channel.

17. The hydraulic pulse generator according to claim 16, characterized in that: One end of the pulse output port close to the inner wall of the shell is configured as a radial distribution hole.

18. The hydraulic pulse generator according to claim 17, characterized in that: The radial distribution hole is a waist-shaped hole.

19. The hydraulic pulse generator according to claim 17, characterized in that The first flow channel is provided with a V-shaped groove at a position corresponding to the radial distribution hole.

20. A hydraulic pulse test bench, characterized in that: The test bench includes: The hydraulic pulse generator according to any one of claims 1 to 10, wherein the hydraulic pulse generator is provided with a fluid inlet and a fluid outlet; a component to be tested connected to the pulse output port; A driving unit for driving the rotating body; a pressure source connected to the fluid inlet; and An oil tank is connected to the fluid outlet.

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