Piston pump clearance detection device, clearance adjustment method and electronic equipment

Abstract

The invention discloses a piston pump clearance detection device, a clearance adjustment method and electronic equipment, and the device comprises a base which is detachably installed at the top of a to-be-detected piston pump and is sealed with the to-be-detected piston pump; one end of the telescopic assembly penetrates through the two opposite sides of the base and is movably connected with the base in a sealed mode, and the telescopic assembly is used for controlling a driving piston of the to-be-tested piston pump to move in a reciprocating mode; a clearance detection circuit electrically connected with the driving piston is arranged in the controller, and the controller is used for sending a detection signal to the to-be-detected piston pump through the clearance detection circuit and calculating the clearance of the to-be-detected piston pump according to the detection signal. The clearance of the to-be-detected piston pump is automatically detected, the target clearance of the to-be-detected piston pump is adjusted through the detected real-time clearance and the preset clearance threshold value, the clearance of the to-be-detected piston pump is automatically adjusted, a safe amplification clearance does not need to be arranged, and the volume efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of piston pump technology, and in particular to a piston pump clearance detection device, clearance adjustment method, and electronic equipment. Background Technology

[0002] Piston pumps, also known as electric reciprocating pumps, are characterized by their high head and are suitable for conveying oil emulsions and other liquids without solid particles at room temperature. These pumps are widely used in oil fields, coal seam water injection, oil injection, and oil extraction, such as as power pumps for chamber presses and hydraulic presses, and for conveying ammonia in fertilizer plants.

[0003] Currently, existing piston pumps are designed and manufactured with a sufficiently large clearance to prevent cylinder collisions, and the piston stroke is a fixed value that cannot be adjusted. However, the volumetric efficiency of piston pumps under high pressure (e.g., 90 MPa) is highly sensitive to the size of the clearance. The non-adjustable stroke length means that the clearance reserved during design cannot be further optimized or reduced during later adjustments; it must be increased to a sufficiently safe value for safety, resulting in low volumetric efficiency. Furthermore, since the actual clearance size cannot be measured or adjusted when the piston pump is cold, as the drive end oil temperature rises, the drive cylinder lengthens, leading to a longer stroke. This necessitates increasing the cold-end clearance beforehand to prevent cylinder collisions and reduce volumetric efficiency. Furthermore, when the piston pump is a cryogenic piston pump, when the medium changes, such as when conveying different media such as liquid carbon dioxide, liquefied natural gas, liquid nitrogen, liquid hydrogen, and liquid helium, the shrinkage rate of the pump body components will also be different due to the different media temperatures, resulting in changes in clearance. The clearance suitable for one medium is often not optimal for another medium. Changes in media temperature will also cause a decrease in volumetric efficiency. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing piston pumps, such as the inability to detect and adjust clearance and low volumetric efficiency, and to provide a piston pump clearance detection device, clearance adjustment method, and electronic device.

[0005] The technical solution of the present invention provides a piston pump clearance detection device, comprising:

[0006] A base for detachably mounting on top of the piston pump under test, and the base is sealed to the piston pump under test;

[0007] A telescopic assembly, one end of which extends through opposite sides of the base and is sealed and movably connected to the base, is used to control the reciprocating motion of the drive piston of the piston pump under test;

[0008] The controller is electrically connected to the drive piston. The controller has a clearance detection circuit, which is used to send a detection signal to the piston pump under test through the clearance detection circuit and calculate the clearance of the piston pump under test based on the detection signal.

[0009] In one alternative technical solution, the telescopic assembly includes a telescopic rod, a motor, and a drive mechanism.

[0010] One end of the telescopic rod passes through the opposite sides of the base and is connected to the drive piston;

[0011] One end of the motor is connected to the drive mechanism, and the other end of the motor is connected to the telescopic rod. The drive mechanism controls the reciprocating motion of the telescopic rod through the motor.

[0012] In one of the alternative technical solutions, the clearance detection circuit includes:

[0013] A capacitance detection circuit is used to detect the capacitance value between the cold end piston of the piston pump under test and the liquid inlet flange of the piston pump under test when the telescopic assembly controls the reciprocating motion of the drive piston, and to calculate the clearance of the piston pump under test based on the capacitance value.

[0014] In one of the alternative technical solutions, the clearance detection circuit includes:

[0015] An electromagnetic wave detection circuit is used to send a first electromagnetic wave signal to the inlet flange of the piston pump under test according to a first preset wavelength when the telescopic component controls the reciprocating motion of the drive piston, and to receive a second electromagnetic wave signal fed back by the inlet flange, and to calculate the clearance of the piston pump under test based on the first electromagnetic wave signal and the second electromagnetic wave signal.

[0016] In one of the alternative technical solutions, the clearance detection circuit includes:

[0017] An ultrasonic detection circuit is used to send a first ultrasonic signal to the inlet flange of the piston pump under test according to a second preset wavelength when the telescopic assembly controls the reciprocating motion of the drive piston, and to receive a second ultrasonic signal fed back by the inlet flange, and to calculate the clearance of the piston pump under test based on the first ultrasonic signal and the second ultrasonic signal.

[0018] In one of the alternative technical solutions, the controller is further provided with a resistance detection circuit for detecting the resistance value of the housing of the piston pump under test.

[0019] The technical solution of the present invention also provides a method for adjusting the clearance of a piston pump, comprising:

[0020] The real-time clearance of the piston pump under test is obtained by using the piston pump clearance detection device as described above.

[0021] The target clearance of the piston pump under test is adjusted according to the real-time clearance and the preset clearance threshold.

[0022] In one of the alternative technical solutions, the step of obtaining the real-time clearance of the piston pump under test by using the piston pump clearance detection device as described above further includes:

[0023] Control the drive piston of the piston pump under test to move toward the inlet flange of the piston pump under test until the drive piston stops moving and the resistance detected by the resistance detection circuit of the piston pump clearance detection device is a first preset resistance threshold. Record this position as the bottoming position.

[0024] According to the preset clearance threshold, the drive piston is controlled to move away from the liquid inlet flange. When the resistance value is the second preset resistance threshold, the position at this time is recorded as the bottom dead center of the piston. The second preset resistance threshold is greater than the first preset resistance threshold.

[0025] Continue to control the drive piston to move away from the inlet flange until the drive piston stops moving and the resistance value is a first preset resistance threshold. Record this position as the piston touch-top position.

[0026] When the drive piston is controlled to move toward the direction closer to the liquid inlet flange according to the preset clearance threshold, and the resistance value is the second preset resistance threshold, the position at this time is recorded as the piston top dead center.

[0027] The step of adjusting the target clearance of the piston pump under test according to the real-time clearance and the preset clearance threshold includes:

[0028] If the real-time clearance exceeds the preset clearance threshold, adjust the bottom dead center of the piston.

[0029] In one of the alternative technical solutions, adjusting the piston bottom dead center if the real-time clearance exceeds the preset clearance threshold includes:

[0030] If the real-time clearance is greater than the preset clearance threshold, the bottom dead center of the piston will be moved down.

[0031] If the real-time clearance is less than the preset clearance threshold, the bottom dead center of the piston will be moved upward.

[0032] The present invention also provides an electronic device for adjusting the clearance of a piston pump, comprising:

[0033] At least one processor; and,

[0034] A memory communicatively connected to the at least one processor; wherein,

[0035] The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the piston pump clearance adjustment method as described above.

[0036] The above technical solution offers the following advantages: During testing, the base is installed on top of the piston pump under test and is sealed to it. A telescopic assembly drives the piston assembly of the piston pump under test to reciprocate. Simultaneously, the controller controls the clearance detection circuit to send a detection signal to the piston assembly of the piston pump under test. The controller calculates the clearance of the piston pump under test based on the detection signal fed back from the piston assembly, thus automatically detecting the clearance. Furthermore, by acquiring the real-time clearance of the piston pump under test using the clearance detection device and adjusting the target clearance of the piston pump under test based on the real-time clearance and a preset clearance threshold, automatic adjustment of the clearance of the piston pump under test is achieved without the need for setting a safety amplification clearance, thereby improving volumetric efficiency. Attached Figure Description

[0037] The disclosure of this invention will become more readily understood by referring to the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings:

[0038] Figure 1 This is a schematic diagram of a piston pump.

[0039] Figure 2 This is a schematic diagram of the structure of a piston pump clearance detection device according to an embodiment of the present invention;

[0040] Figure 3 This is a schematic diagram of the piston pump clearance detection device of the present invention installed on a piston pump;

[0041] Figure 4 A flowchart illustrating a piston pump clearance adjustment method according to an embodiment of the present invention;

[0042] Figure 5 A flowchart illustrating a piston pump clearance adjustment method according to another embodiment of the present invention;

[0043] Figure 6 This is a schematic diagram of the hardware structure of an electronic device for adjusting the clearance of a piston pump, provided as an embodiment of the present invention.

[0044] Reference table for attached figures:

[0045] 10-Piston pump; 11-Housing; 111-Drive end housing; 112-Intermediate section housing; 113-Cold end housing; 1131-Inlet flange; 12-Piston assembly; 121-Drive piston; 122-Piston rod; 123-Cold end piston; 13-Sealing cover; 14-First seal; 15-Second seal; 16-Third seal; 17-Fourth seal; 20-Piston pump clearance detection device; 21-Base; 22-Telescopic assembly; 23-Conductive component. Detailed Implementation

[0046] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0047] It is readily understood that, based on the technical solution of this invention, various structural and implementation methods can be interchanged by those skilled in the art without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of the invention.

[0048] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the structures shown in the accompanying drawings. They are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0049] The piston pump clearance detection device provided by this invention is mainly applied to piston pumps, including ambient temperature piston pumps and cryogenic piston pumps. Cryogenic piston pumps include liquid hydrogen pumps, liquid nitrogen pumps, liquefied natural gas pumps, liquid carbon dioxide pumps, etc. Figure 1As shown, the piston pump 10 includes a housing 11, a piston assembly 12, and a sealing cover 13. The piston assembly 12 is sealed inside the housing 11 by the sealing cover 13 and reciprocates along the length of the housing 11. The housing 11 includes a drive end housing 111, an intermediate section housing 112, and a cold end housing 113. The two ends of the intermediate section housing 112 are respectively sealed to the drive end housing 111 and the cold end housing 113 via mounting flanges. The bottom of the cold end housing 113 is provided with a liquid inlet flange 1131. The piston assembly 12 includes a drive piston 121, a piston rod 122, and a cold end piston 123. The two ends of the piston rod 122 are respectively connected to the drive piston 121 and the cold end piston 123 and are integrally formed. The two ends of the drive piston 121 along its length are movably connected to the opposite side walls of the drive end housing 111 via a first seal 14. The first end of the piston rod 122 is hermetically connected to the drive end housing 111 via a second seal 15, thus sealing the drive piston 121 within the drive end housing 111. The second end of the piston rod 122 is hermetically connected to the intermediate section housing 112 via a third seal 16, thus sealing the cold end piston 123 within the cold end housing 113. The opposite ends of the cold end piston 123 are movably connected to the opposite side walls of the cold end housing 113 via a fourth seal 17. The working principle of the piston pump is the same as that of the prior art and will not be described in detail here.

[0050] like Figure 2 As shown, an embodiment of the present invention provides a piston pump clearance detection device 20, comprising:

[0051] The base 21 is used to be detachably mounted on the top of the piston pump 10 under test, and the base 21 is sealed to the piston pump 10 under test.

[0052] Telescopic component 22, one end of which passes through the opposite sides of the base 21 and is sealed and movably connected to the base 21, is used to control the reciprocating motion of the drive piston 121 of the piston pump 10 under test.

[0053] The controller is electrically connected to the drive piston 121. The controller has a clearance detection circuit, which is used to send a detection signal to the piston pump 10 under test through the clearance detection circuit, and calculate the clearance of the piston pump 10 under test based on the detection signal.

[0054] The piston pump clearance detection device 20 provided by the present invention mainly includes a base 21, a telescopic component 22, and a controller.

[0055] During testing, the sealing cover 13 of the piston pump 10 under test is removed, and the piston pump clearance detection device 20 is installed on the sealing cover 13 via the base 21, replacing the sealing cover 13. The base 21 can be detachably connected to the piston pump 10 under test by means of buckles or threads, which is convenient for disassembly. The piston assembly 12 of the piston pump 10 under test is electrically connected to an external power source through conductive parts 23 such as conductive wires, so that the piston assembly 12 is conductive. Then, the telescopic component 22 is controlled to drive the piston assembly 12 to reciprocate. At the same time, the controller controls the clearance detection circuit to send a detection signal to the piston assembly 12. The controller calculates the clearance of the piston pump 10 under test based on the detection signal fed back by the piston assembly 12, thereby realizing the automatic detection of the clearance of the piston pump 10 under test.

[0056] It should be noted that when the piston pump 10 under test is a cryogenic piston pump, the cold end piston 123 of the piston pump 10 under test needs to be immersed in the cryogenic medium, and the piston 121 is exposed, so that the online clearance detection of the cryogenic piston pump under cold state can be automatically realized.

[0057] In this embodiment, during testing, the base is installed on top of the piston pump under test and is sealed to the piston pump. The piston assembly of the piston pump under test is driven to reciprocate through the telescopic component. At the same time, the controller controls the clearance detection circuit to send a detection signal to the piston assembly of the piston pump under test. The controller calculates the clearance of the piston pump under test based on the detection signal fed back by the piston assembly, thereby realizing the automatic detection of the clearance of the piston pump under test.

[0058] In one alternative embodiment, the telescopic assembly 22 includes a telescopic rod 221, a motor, and a drive mechanism 222.

[0059] One end of the telescopic rod 221 passes through the opposite sides of the base 21 and is connected to the drive piston 121;

[0060] One end of the motor is connected to the drive mechanism 222, and the other end of the motor is connected to the telescopic rod 221. The drive mechanism 222 controls the telescopic rod 221 to reciprocate through the motor.

[0061] The drive mechanism 222 drives the piston assembly 12 to reciprocate by controlling the forward and reverse rotation of the motor to drive the telescopic rod 221 to reciprocate.

[0062] It should be noted that the telescopic component 22 can also drive the piston assembly 12 to reciprocate in other existing ways, such as controlling the telescopic rod 221 to reciprocate in a hydraulic cylinder, or manually controlling the telescopic rod 221 to reciprocate in order to drive the piston assembly 12 to reciprocate in a similar way. Therefore, the telescopic component 22 is not limited to these methods.

[0063] In one alternative embodiment, the clearance detection circuit includes:

[0064] The capacitance detection circuit is used to detect the capacitance value between the cold end piston 123 of the piston pump under test and the liquid inlet flange 1131 of the piston pump under test when the telescopic component 22 controls the reciprocating motion of the drive piston 121, and to calculate the clearance of the piston pump under test based on the capacitance value.

[0065] During testing, the controller powers the piston assembly 12 to an external power source, and the telescopic assembly 22 drives the piston 121 to reciprocate. Simultaneously, the capacitance detection circuit detects the capacitance between the cold-end piston 123 and the inlet flange 1131. The controller calculates the distance between the cold-end piston 123 and the inlet flange 1131 based on the capacitance value, thereby calculating the clearance of the piston pump 10 under test, achieving automatic clearance detection. Furthermore, changes in capacitance value can detect whether the manufacturing and assembly precision of the piston pump 10 under test is low (including information such as the coaxiality of the piston and bushing), or whether the seals are worn (reduced sealing performance). For example, if the distance between the cold-end piston 123 and the inlet flange 1131 is relatively large, and the capacitance value of the driving piston 121 is 0 or fluctuates significantly (greater than or less than a preset capacitance threshold), it indicates low manufacturing and assembly precision or seal wear.

[0066] The capacitance detection circuit can be a capacitance sensor.

[0067] In one optional embodiment, to further facilitate the detection of the clearance of the piston pump 10 under test, the calculation of the clearance of the piston pump under test based on the capacitance value includes:

[0068] The clearance of the piston pump under test can be calculated using the following formula:

[0069] C = ε × S / 4πkd;

[0070] Where C is the capacitance value; S is the cross-sectional area of ​​the cold end piston 123; d is the clearance of the piston pump 10 under test; ε is the dielectric constant; and k is the electrostatic constant.

[0071] In one alternative embodiment, the clearance detection circuit includes:

[0072] The electromagnetic wave detection circuit is used to send a first electromagnetic wave signal to the inlet flange 1131 of the piston pump under test according to a first preset wavelength when the telescopic component 22 controls the reciprocating motion of the piston 121, and to receive a second electromagnetic wave signal fed back by the inlet flange 1131, and to calculate the clearance of the piston pump under test 10 according to the first electromagnetic wave signal and the second electromagnetic wave signal.

[0073] During testing, the controller powers the piston assembly 12 to an external power source, and the telescopic assembly 22 drives the piston 121 to reciprocate. Simultaneously, the electromagnetic wave detection circuit emits a first electromagnetic wave signal through the piston assembly 12 to the inlet flange 1131 according to a first preset wavelength. The first electromagnetic wave signal returns after encountering the inlet flange 1131, feeding back a second electromagnetic wave signal. The controller calculates the distance between the cold end piston 123 and the inlet flange 1131 based on the first and second electromagnetic wave signals, thereby calculating the clearance of the piston pump 10 under test and realizing automatic detection of the clearance of the piston pump 10 under test. At the same time, the manufacturing and assembly precision of the piston pump 10 under test can be detected based on the first electromagnetic wave signal and the second electromagnetic wave signal (including information such as the coaxiality of the piston and the bushing) or whether the seal is worn (reduced sealing performance). Because low manufacturing and assembly precision or worn seals will cause the cold end piston 123 and the liquid inlet flange 1131 to not be in contact and become one, the first electromagnetic wave signal cannot be emitted to the liquid inlet flange 1131, thus indicating low manufacturing and assembly precision or worn seals.

[0074] The first preset wavelength can be set according to user needs, as long as the first preset wavelength can reach the liquid inlet flange 1131 through the piston assembly 12.

[0075] Among them, the electromagnetic wave detection circuit can be a radar.

[0076] In one alternative embodiment, the clearance detection circuit includes:

[0077] The ultrasonic detection circuit is used to send a first ultrasonic signal to the inlet flange 1131 of the piston pump under test according to a second preset wavelength when the telescopic component 22 controls the reciprocating motion of the piston 121, and to receive a second ultrasonic signal fed back by the inlet flange 1131, and to calculate the clearance of the piston pump under test 10 according to the first ultrasonic signal and the second ultrasonic signal.

[0078] During testing, the controller powers the piston assembly 12 to an external power source, and the telescopic assembly 22 drives the piston 121 to reciprocate. Simultaneously, the ultrasonic detection circuit emits a first ultrasonic signal through the piston assembly 12 to the inlet flange 1131 according to a second preset wavelength. The first ultrasonic signal returns upon encountering the inlet flange 1131, feeding back a second ultrasonic signal. The controller calculates the distance between the cold-end piston 123 and the inlet flange 1131 based on the first and second ultrasonic signals, thereby calculating the clearance of the piston pump 10 under test and automatically detecting the clearance. Furthermore, the first and second ultrasonic signals can detect whether the manufacturing and assembly precision of the piston pump 10 under test is low (including information such as the coaxiality of the piston and bushing) or whether the seals are worn (reduced sealing performance). Low manufacturing and assembly precision or worn seals will prevent the cold-end piston 123 from contacting the inlet flange 1131, preventing the first ultrasonic signal from being emitted to the inlet flange 1131, thus indicating low manufacturing and assembly precision or worn seals.

[0079] The second preset wavelength can be set according to user needs, as long as the second preset wavelength can reach the liquid inlet flange 1131 through the piston assembly 12.

[0080] In one optional embodiment, the controller is further provided with a resistance detection circuit for detecting the resistance value of the housing 11 of the piston pump 10 under test. The resistance value is used to determine whether the cold end piston 123 is in contact with the liquid inlet flange during reciprocating motion. If they are in contact, the resistance detection circuit can detect that the resistance value of the liquid inlet flange is a first preset resistance threshold (the resistance value is very small). If they are not in contact, the resistance detection circuit can detect that the resistance value of the intermediate section housing 12 is a second preset resistance threshold (the resistance value becomes very large). Thus, the resistance value can be used to detect whether the piston pump 10 under test has low manufacturing and assembly precision or whether the seals are worn.

[0081] like Figure 4 As shown, an embodiment of the present invention provides a method for adjusting the clearance of a piston pump, comprising:

[0082] Step S401: Obtain the real-time clearance of the piston pump under test detected by the piston pump clearance detection device as described above.

[0083] Step S402: Adjust the target clearance of the piston pump under test according to the real-time clearance and the preset clearance threshold.

[0084] Specifically, when the real-time clearance of the piston pump under test is detected by the aforementioned piston pump clearance detection device, the controller executes step S401 to obtain the real-time clearance, and then executes step S402 to adjust the target clearance of the piston pump under test according to the real-time clearance and the preset clearance threshold. After the adjustment is completed, the piston pump clearance detection device is disassembled, the stop plate height of the sealing cover of the piston pump under test is adjusted to the corresponding optimal position, and the sealing cover is installed to realize automatic adjustment of the clearance of the piston pump under test. This achieves high accuracy and improves the volumetric efficiency of the piston pump.

[0085] The preset clearance threshold can be determined by the following method:

[0086] The cold end piston contraction and length in the cold state are calculated based on the temperature of the working medium (including liquid carbon dioxide, liquefied natural gas, liquid nitrogen, liquid hydrogen, etc.) of the piston pump under test. The safety margin of the anti-collision cylinder is calculated based on the actual drive response speed of the piston pump under test. Then, an optimal clearance value is calculated based on the output pressure and flow rate of the piston pump under test, which is the preset clearance threshold.

[0087] It should be noted that when the piston pump 10 under test is a cryogenic piston pump, the cold end piston 123 of the piston pump 10 under test needs to be immersed in the cryogenic medium, and the piston 121 is exposed, so that the online clearance adjustment of the cryogenic piston pump in the cold state can be automatically realized.

[0088] In this embodiment, the real-time clearance of the piston pump under test is detected by a piston pump clearance detection device, and the target clearance of the piston pump under test is adjusted according to the real-time clearance and the preset clearance threshold, thereby realizing automatic adjustment of the clearance of the piston pump under test without the need to set a safety amplification clearance, thus improving volumetric efficiency.

[0089] like Figure 5 As shown, another embodiment of the present invention provides a method for adjusting the clearance of a piston pump, comprising:

[0090] Step S501: Control the drive piston of the piston pump under test to move towards the inlet flange of the piston pump under test until the drive piston stops moving and the resistance detected by the resistance detection circuit of the piston pump clearance detection device is the first preset resistance threshold. Record this position as the bottoming position.

[0091] Step S502: Control the drive piston to move away from the inlet flange according to the preset clearance threshold, and when the resistance value is the second preset resistance threshold, record the position at this time as the bottom dead center of the piston. The second preset resistance threshold is greater than the first preset resistance threshold.

[0092] Step S503: Continue to control the drive piston to move away from the inlet flange until the drive piston stops moving and the resistance value is the first preset resistance threshold. Record this position as the piston touch position.

[0093] Step S504: Control the drive piston to move towards the direction close to the liquid inlet flange according to the preset clearance threshold, and when the resistance value is the second preset resistance threshold, record the position at this time as the piston top dead center;

[0094] Step S505: Obtain the real-time clearance of the piston pump under test detected by the piston pump clearance detection device as described above.

[0095] Step S506: Determine whether the real-time clearance exceeds the preset clearance threshold;

[0096] Step S507: Adjust the bottom dead center of the piston.

[0097] Specifically, in step S501, the drive mechanism and motor of the piston pump clearance detection device are used to slowly push the drive piston of the piston pump under test to the bottom dead center of the cold end until the cold end piston contacts the bottom liquid inlet flange. At this time, the capacitance or resistance can be detected by the capacitance detection circuit or the resistance detection circuit to rapidly decrease from a large value (the capacitance or resistance value is very small when in contact). Immediately afterwards, the feedback current of the motor rapidly increases. Based on these two signals, it is determined that contact has been made, the motor is stopped, and this position is recorded as the bottoming position.

[0098] In step S502, the drive mechanism controls the motor to reverse, pulling the drive piston back a small distance from the bottom position to the preset clearance threshold, which is taken as the optimal piston bottom dead center position and recorded as the piston bottom dead center.

[0099] In step S503, the drive piston is pulled back until the cold end piston contacts the lower flange of the middle section of the housing. At this time, the capacitance or resistance decreases rapidly, and the motor feedback current increases immediately. It is determined that the top position has been reached, the drive is stopped, and this position is recorded.

[0100] In step S504, the drive mechanism controls the motor to reverse again, pressing the drive piston down a small distance of a preset clearance threshold, which is taken as the optimal piston top dead center position and recorded as the piston top dead center.

[0101] In step S506, it is determined whether the real-time clearance exceeds the preset clearance threshold. If so, step S507 is executed to adjust the bottom dead center of the piston; otherwise, step S502 is executed.

[0102] In this embodiment, the real-time clearance of the piston pump under test is detected by a piston pump clearance detection device, and the target clearance of the piston pump under test is adjusted according to the real-time clearance and the preset clearance threshold, thereby realizing automatic adjustment of the clearance of the piston pump under test without the need to set a safety amplification clearance, thus improving volumetric efficiency.

[0103] In one embodiment, step S506 includes:

[0104] If the real-time clearance is greater than the preset clearance threshold, the piston bottom dead center will be moved down;

[0105] If the real-time clearance is less than the preset clearance threshold, the piston bottom dead center will be moved up.

[0106] Specifically, if the controller determines that the real-time clearance is greater than the preset clearance threshold, it will move the piston bottom dead center down; otherwise, it will move the piston bottom dead center up until the real-time clearance is within the preset clearance threshold range, thereby achieving more accurate adjustment of the clearance of the piston pump under test.

[0107] like Figure 6 As shown, a hardware structure diagram of an electronic device for adjusting the clearance of a piston pump according to an embodiment of the present invention is provided, including:

[0108] At least one processor 601; and,

[0109] Memory 602 is communicatively connected to at least one processor 601; wherein,

[0110] The memory 602 stores instructions that can be executed by at least one processor 601, which enables the at least one processor 601 to perform the piston pump clearance adjustment method as described in any of the above method embodiments.

[0111] Figure 6 Take the 601 processor as an example.

[0112] The electronic device is preferably a controller for adjusting the clearance of the piston pump.

[0113] The electronic device may also include an input device 603 and an output device 604.

[0114] The processor 601, memory 602, input device 603 and output device 604 can be connected by a bus or other means. The figure shows an example of connection by a bus.

[0115] The memory 602, as a non-volatile computer-readable storage medium, can be used to obtain non-volatile software programs, non-volatile computer-executable programs, and modules, such as the program instructions / modules corresponding to the piston pump clearance adjustment method in the embodiments of this application, for example, Figures 4-5 The method flow is shown. The processor 601 executes various functional applications and data processing by running non-volatile software programs, instructions, and modules acquired in the memory 602, thereby realizing the piston pump clearance adjustment method in the above embodiment.

[0116] Memory 602 may include a program acquisition area and a data acquisition area, wherein the program acquisition area may acquire an operating system and an application program required for at least one function; the data acquisition area may acquire data created according to the use of the piston pump clearance adjustment method, etc. Furthermore, memory 602 may include high-speed random access memory and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state storage device. In some embodiments, memory 602 may optionally include memory remotely located relative to processor 601, and these remote memories may be connected via a network to the apparatus performing the piston pump clearance adjustment method. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0117] The input device 603 can receive user clicks and generate signal inputs related to user settings and function control of the piston pump clearance adjustment method. The output device 604 may include a display device such as a display screen.

[0118] When the one or more modules are accessed in the memory 602 and are run by the one or more processors 601, the piston pump clearance adjustment method in any of the above method embodiments is executed.

[0119] The above-described product can perform the methods provided in the embodiments of this application, and has the corresponding functional modules and beneficial effects for performing the methods. Technical details not described in detail in this embodiment can be found in the methods provided in the embodiments of this application.

[0120] The above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention, and are not intended to limit them. Although the embodiments of the present invention have been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A piston pump clearance detection device, characterized in that, include: A base for detachably mounting on top of the piston pump under test, and the base is sealed to the piston pump under test; A telescopic assembly, one end of which extends through opposite sides of the base and is sealed and movably connected to the base, is used to control the reciprocating motion of the drive piston of the piston pump under test; The controller is electrically connected to the drive piston. The controller has a clearance detection circuit, which is used to send a detection signal to the piston pump under test through the clearance detection circuit and calculate the clearance of the piston pump under test based on the detection signal.

2. The piston pump clearance detection device as described in claim 1, characterized in that, The telescopic assembly includes a telescopic rod, a motor, and a drive mechanism. One end of the telescopic rod passes through the opposite sides of the base and is connected to the drive piston; One end of the motor is connected to the drive mechanism, and the other end of the motor is connected to the telescopic rod. The drive mechanism controls the reciprocating motion of the telescopic rod through the motor.

3. The piston pump clearance detection device as described in claim 1 or 2, characterized in that, The clearance detection circuit includes: A capacitance detection circuit is used to detect the capacitance value between the cold end piston of the piston pump under test and the liquid inlet flange of the piston pump under test when the telescopic assembly controls the reciprocating motion of the drive piston, and to calculate the clearance of the piston pump under test based on the capacitance value.

4. The piston pump clearance detection device as described in claim 1 or 2, characterized in that, The clearance detection circuit includes: An electromagnetic wave detection circuit is used to send a first electromagnetic wave signal to the inlet flange of the piston pump under test according to a first preset wavelength when the telescopic component controls the reciprocating motion of the drive piston, and to receive a second electromagnetic wave signal fed back by the inlet flange, and to calculate the clearance of the piston pump under test based on the first electromagnetic wave signal and the second electromagnetic wave signal.

5. The piston pump clearance detection device as described in claim 1 or 2, characterized in that, The clearance detection circuit includes: An ultrasonic detection circuit is used to send a first ultrasonic signal to the inlet flange of the piston pump under test according to a second preset wavelength when the telescopic assembly controls the reciprocating motion of the drive piston, and to receive a second ultrasonic signal fed back by the inlet flange, and to calculate the clearance of the piston pump under test based on the first ultrasonic signal and the second ultrasonic signal.

6. The piston pump clearance detection device as described in claim 1 or 2, characterized in that, The controller also includes a resistance detection circuit for detecting the resistance value of the housing of the piston pump under test.

7. A method for adjusting the clearance of a piston pump, characterized in that, include: The real-time clearance of the piston pump under test is obtained by using the piston pump clearance detection device as described in any one of claims 1-6. The target clearance of the piston pump under test is adjusted according to the real-time clearance and the preset clearance threshold.

8. The piston pump clearance adjustment method as described in claim 7, characterized in that, The step of obtaining the real-time clearance of the piston pump under test detected by the piston pump clearance detection device as described in any one of claims 1-6 further includes: Control the drive piston of the piston pump under test to move toward the inlet flange of the piston pump under test until the drive piston stops moving and the resistance detected by the resistance detection circuit of the piston pump clearance detection device is a first preset resistance threshold. Record this position as the bottoming position. According to the preset clearance threshold, the drive piston is controlled to move away from the liquid inlet flange. When the resistance value is the second preset resistance threshold, the position at this time is recorded as the bottom dead center of the piston. The second preset resistance threshold is greater than the first preset resistance threshold. Continue to control the drive piston to move away from the inlet flange until the drive piston stops moving and the resistance value is a first preset resistance threshold. Record this position as the piston touch-top position. When the drive piston is controlled to move toward the direction closer to the liquid inlet flange according to the preset clearance threshold, and the resistance value is the second preset resistance threshold, the position at this time is recorded as the piston top dead center. The step of adjusting the target clearance of the piston pump under test according to the real-time clearance and the preset clearance threshold includes: If the real-time clearance exceeds the preset clearance threshold, adjust the bottom dead center of the piston.

9. The piston pump clearance adjustment method as described in claim 8, characterized in that, If the real-time clearance exceeds the preset clearance threshold, adjusting the piston's bottom dead center includes: If the real-time clearance is greater than the preset clearance threshold, the bottom dead center of the piston will be moved down. If the real-time clearance is less than the preset clearance threshold, the bottom dead center of the piston will be moved upward.

10. An electronic device for adjusting the clearance of a piston pump, characterized in that, include: At least one processor; as well as, A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the piston pump clearance adjustment method as described in any one of claims 7-9.

Images