An air bag detection device for a reciprocating piston diaphragm pump and a method of using the same

Abstract

The invention relates to the technical field of air bag discharge of a reciprocating piston diaphragm pump, and specifically discloses an air bag airbag detection device for a reciprocating piston diaphragm pump and a method for using the same. The device comprises a shell connected to an outlet pipe of the diaphragm pump, a top cover of the shell is provided with a sheath, and an airbag stroke detection mechanism is provided on the sheath. In the invention, when a magnetic sensor on the upper part of the sheath detects a magnet on a guide rod, the detected signal is transmitted to a PLC main control unit, and after being processed by a program, the detected signal is displayed in the form of sound and light, indicating that leakage occurs in the air bag and an inspection is required. After eliminating the cause of the leakage, the air bag is inflated; when a magnetic sensor on the lower part of the sheath detects the magnet on the guide rod, it indicates that the air bag of the air bag may be damaged and needs to be replaced at an appropriate time; by providing this set of detection mechanisms, the movement state of the air bag that cannot be observed from the outside can be indirectly obtained through the detection mechanism, thereby ensuring the normal operation of the equipment.

Description

Technical Field

[0001] The invention relates to the technical field of reciprocating piston diaphragm pumps, and in particular to an air bag airbag detection device for a reciprocating piston diaphragm pump and a use method thereof. Background Art

[0002] The reciprocating piston diaphragm pump is a device that uses the concave and convex motion of the diaphragm to pump solid-liquid two-phase media. The motor drives the crank slider mechanism through the reducer to convert the rotational motion into linear motion, driving the piston to reciprocate. The piston uses the oil medium to make the diaphragm move concave and convex, so that the volume of the diaphragm chamber changes periodically to complete the medium transportation. Because the diaphragm separates the medium from the oil medium, the moving parts such as the piston, piston seal and cylinder liner do not directly contact the conveying medium, avoiding the wear caused by solid particles in the medium and ensuring the service life of these moving parts.

[0003] The outlet pre-pressurized air bag of the diaphragm pump is a component used to optimize the performance of the pump system. Its main function is to absorb and alleviate the pressure fluctuations at the pump outlet, stabilize the liquid flow, and reduce the pulsation of the system. The pre-pressurized air bag uses elastic elements to separate the gas and liquid, and is pre-filled with gas at a certain pressure. This pressure value is usually set according to the working pressure of the system. When the diaphragm pump is running, the liquid will undergo a periodic discharge and suction process, which will cause fluctuations in the outlet pressure. The pre-pressurized air in the air bag will absorb these pressure fluctuations and convert the pulsating pressure changes into compression or expansion of the air in the air bag, thereby smoothing the flow of liquid; the pre-pressurized air bag helps maintain a stable pressure in the system, making the liquid flow at the pump outlet more uniform and reducing the pulsation effect in the liquid flow; this helps to reduce the impact on the pipeline system and downstream equipment, and extend the service life of system components.

[0004] The outlet pre-pressurized air bag of the diaphragm pump faces some technical problems in practical application:

[0005] 1) Once the gas in the air bag leaks, the volume of the medium area of ​​the air bag will increase under high pressure, and the pressure stabilization effect of the air bag will gradually weaken. As the gas volume further decreases, the bottom of the air bag may even impact the top cover, and the bending of the air bag will be aggravated. 2) When the air bag in the air bag is damaged, the medium is in direct contact with the gas in the air bag. Under high pressure, the gas dissolves in the hydraulic medium and is continuously taken out. The amount of gas gradually decreases, and the air bag loses its pulsation suppression function. Existing air bags do not have the function of detecting the working status of the air bag. After the air bag is damaged, as the vibration of the pipeline system increases, in severe cases, the pipeline system will resonate, causing damage to the equipment.

[0006] Therefore, we provide an air bag airbag detection device for a reciprocating piston diaphragm pump to solve the above problems. Summary of the invention

[0007] 1. Technical issues to be resolved

[0008] The problem to be solved by the present invention is to provide an air bag detection device for a reciprocating piston diaphragm pump and a use method thereof, so as to overcome the defects in the prior art.

[0009] (II) Technical solution

[0010] In order to solve the technical problem, the present invention provides an air bag airbag detection device for a reciprocating piston diaphragm pump, comprising a shell connected to an outlet pipe of the diaphragm pump, a cavity is arranged in the shell, an airbag is arranged in the cavity of the shell, an air cavity is formed between the top cover of the shell and the airbag, a medium cavity is formed between the airbag and the bottom of the shell, a sheath is arranged on the top cover, the sheath is a hollow structure, a guide rod fixedly connected to the airbag is arranged in the sheath, and an airbag stroke detection mechanism cooperating with the airbag is arranged in the sheath;

[0011] The airbag stroke detection mechanism includes a sheath and a guide rod, one end of the guide rod is connected to the center of the airbag through a connector, a magnet is arranged on the guide rod, an upper magnetic sensor and a lower magnetic sensor are arranged on the sheath, the outer surface of the blind hole internal thread where the upper magnetic sensor and the lower magnetic sensor are connected to the sheath is scraped flat, and the detection end external threads of the upper magnetic sensor and the lower magnetic sensor are connected to the blind hole internal thread on one side of the sheath;

[0012] The top cover is provided with an inflation valve communicated with the air cavity.

[0013] Furthermore, when the airbag is in a balanced state, the magnet on the guide rod is located between the upper magnetic sensor and the lower magnetic sensor.

[0014] Furthermore, the connecting piece includes a guide rod, an upper sealing plate with a through hole in the center, and a lower sealing plate with a blind hole internal thread in the center.

[0015] Furthermore, the guide rod passes through the upper sealing plate and is threadedly connected to the lower sealing plate. The bottom of the airbag is clamped between the upper sealing plate and the lower sealing plate. The upper sealing plate and the lower sealing plate are located at the bottom center of the airbag.

[0016] Furthermore, the protective sleeve and the top cover are detachably connected, a guide sleeve is provided on the protective sleeve near the top cover, and the guide rod and the guide sleeve are in sliding fit.

[0017] Furthermore, a pressure gauge connected to the air cavity is arranged on the top cover, a connecting hole connected to the medium cavity is opened at the bottom of the shell, and the medium cavity is connected to the outlet pipe of the pump through the connecting hole.

[0018] A method for using an air bag detection device for a reciprocating piston diaphragm pump comprises the following steps:

[0019] S1. The guide rod and the sheath are made of non-magnetic materials. The distance between the upper magnetic sensor and the lower magnetic sensor is set in advance according to the requirements of the diaphragm pump's delivery flow frequency conversion range. The gas is filled into the airbag through the inflation valve. The inflation is stopped by observing the pressure gauge until the airbag reaches the preset value.

[0020] S2. When the pump body conveys materials, the air bag utilizes the compression and expansion of gas to continuously store or compensate for part of the fluid in the pump outlet pipe line, so as to reduce the pressure fluctuation caused by the uneven discharge of the diaphragm pump flow;

[0021] S3. When the gas in the airbag cavity leaks, under the high pressure of the medium cavity fluid, the volume of the medium cavity increases, causing the pressure stabilizing effect of the airbag to gradually weaken. As the volume of the airbag gas further decreases, the airbag drives the guide rod to move toward the top cover. When the upper magnetic sensor of the sheath detects the magnet on the guide rod, the upper magnetic sensor will transmit the detected signal to the PLC controller. After program processing, it will issue a command and transmit it to the alarm device to prompt the operator in the form of sound and light.

[0022] S4. When the airbag ruptures, the air cavity and the medium cavity penetrate each other, and the fluid in the medium cavity flows into the airbag through the rupture. The fluid flowing into the air cavity drives the airbag and the guide rod to move toward the connection hole near the bottom of the shell. When the lower magnetic sensor of the sheath detects the magnet on the guide rod, the lower magnetic sensor transmits the detected signal to the PLC controller, and after program processing, it issues a command and transmits it to the alarm device to prompt the operator in the form of sound and light;

[0023] (III) Beneficial effects

[0024] Compared with the prior art, the air bag airbag detection device for a reciprocating piston diaphragm pump and the use method thereof provided by the present invention have the following beneficial effects:

[0025] 1. The present invention adds an airbag stroke detection device inside the airbag to timely detect the airbag operation status, improve the pulsation suppression effect, and extend the service life of the airbag. By installing an upper magnetic sensor and a lower magnetic sensor on one side of the sheath to detect the reciprocating motion trajectory of the guide rod, the working status of the airbag in the airbag can be indirectly obtained to ensure that the airbag only generates internal force and slight bending deformation during the upper and lower concave and convex deformation process, thereby preventing the airbag from being damaged or ruptured due to external factors;

[0026] 2. According to the pressure variation range of the pump and the use experience, the pre-pressurized air bag allows a volume utilization rate of 50-65% of the actual gas capacity. Therefore, the ratio between the pre-filled nitrogen pressure and the pump discharge pressure is limited to 1:2-1:3. Complying with this regulation can ensure a longer airbag service life. At the same time, considering the width of the temperature and flow frequency conversion range, the distance between the two probes is set to ensure that the airbag is under the best force state and obtain the best attenuation result.

[0027] 3. When the magnetic sensor on the upper part of the sheath in the present invention detects the magnet on the guide rod, the detected signal is transmitted to the PLC main control unit, and after being processed by the program, it is displayed in the form of sound and light. This indicates that the air bag is leaking and needs to be checked. After eliminating the cause of the leakage, the air bag can be inflated. When the magnetic sensor on the lower part of the sheath detects the magnet on the guide rod, it indicates that the air bag may be damaged and needs to be replaced at an appropriate time.

[0028] Through the above design, the phenomenon of not knowing that the air bag is damaged until vibration, noise and other problems occur in the outlet pipeline can be changed to a full-process status detection of the air bag during the operation of the pump to ensure the normal operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 It is an overall structural diagram of an air bag airbag detection device for a reciprocating piston diaphragm pump of the present invention;

[0031] Figure 2 This is a diagram of the internal structure of the existing air bag;

[0032] Figure 3 A cross-sectional view of an air bag airbag detection device for a reciprocating piston diaphragm pump of the present invention;

[0033] Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle;

[0034] Figure 5 For the present invention Figure 3 Enlarged view of point B in the middle;

[0035] The names of the components corresponding to the various figure marks in the figure are: 1. sheath; 101. guide hole; 2. upper magnetic sensor; 3. magnet; 4. lower magnetic sensor; 5. guide sleeve; 6. inflation valve; 7. guide rod; 8. top cover; 9. upper sealing plate; 10. lower sealing plate; 11. airbag; 13. pressure gauge; 17. shell. DETAILED DESCRIPTION

[0036] The present application is described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] The following describes the implementation methods of the present application through specific specific examples. Those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods. The various details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the art without making creative work belong to the scope of protection of the present application.

[0038] It should be noted that various aspects of the embodiments are described below within the scope of the appended book. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspect described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0039] It should also be noted that the illustrations provided in the following embodiments are only used to illustrate the basic concept of the present application in a schematic manner. The drawings only show components related to the present application, rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0040] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the examples can be practiced without these specific details.

[0041] The technical solutions provided by various embodiments of the present application are described below in conjunction with the accompanying drawings.

[0042] See also Figures 1 to 5 The present invention provides an air bag detection device for a reciprocating piston diaphragm pump. In order to make the practical purpose, technical solution and advantages of the present invention clearer, the specific operation process of the present invention is introduced in detail below in combination with the accompanying drawings and the working process of the device.

[0043] The present invention provides an air bag airbag detection device for a reciprocating piston diaphragm pump, comprising a housing 17 connected to an outlet pipe of the diaphragm pump, a cavity being arranged in the housing 17, an airbag 11 being arranged in the cavity of the housing 17, an air cavity being formed between a top cover 8 of the housing 17 and the airbag 11, a medium cavity being formed between the airbag 11 and the bottom of the housing 17, a sheath 1 being arranged on the top cover 8, the sheath 1 being a hollow structure, and an airbag stroke detection mechanism cooperating with the airbag 11 being arranged in the sheath 1;

[0044] The airbag stroke detection mechanism includes a sheath 1 and a guide rod 7, one end of the guide rod 7 is connected to the center of the airbag 11 through a connector, a magnet 3 is arranged on the guide rod 7, an upper magnetic sensor 2 and a lower magnetic sensor 4 are arranged on the sheath 1, the outer surface of the blind hole internal thread where the upper magnetic sensor 2 and the lower magnetic sensor 4 are connected to the sheath 1 is scraped flat, and the detection end external threads of the upper magnetic sensor 2 and the lower magnetic sensor 4 are connected to the blind hole internal thread on one side of the sheath 1;

[0045] The top cover 8 is provided with an inflation valve 6 which is in communication with the air cavity.

[0046] See also Figures 2 to 5 When the airbag 11 is in a balanced state, the magnet 3 on the guide rod 7 is located between the upper magnetic sensor 2 and the lower magnetic sensor 4. The connecting piece includes a guide rod 7, an upper sealing plate 9 with a through hole in the center, which passes through the upper sealing plate 9 and is threadedly connected to the lower sealing plate 10. The bottom of the airbag 11 is clamped between the upper sealing plate 9 and the lower sealing plate 10. The upper sealing plate 9 and the lower sealing plate 10 are located at the bottom center of the airbag 11. The sleeve 1 and the top cover 8 are detachably connected. A guide sleeve 5 is provided near the top cover 8 of the sleeve 1. The guide rod 7 and the guide sleeve 5 are slidably matched. A pressure gauge 13 connected to the air cavity is provided on the top cover 8. A connecting hole connected to the medium cavity is opened at the bottom of the shell 17. The medium cavity is connected to the outlet pipe of the pump through the connecting hole.

[0047] See also Figures 1 to 5 , a method for using an air bag airbag detection device for a reciprocating piston diaphragm pump, comprising the following steps:

[0048] S1, guide rod 7 and sheath 1 are made of non-magnetic materials. The distance between the upper magnetic sensor 2 and the lower magnetic sensor 4 is set in advance according to the requirements of the flow rate conversion range of the diaphragm pump. The airbag 11 is pre-filled with gas through the inflation valve 6. The inflation is stopped by observing the pressure gauge 13 until the airbag 11 reaches a preset value.

[0049] S2. When the pump is conveying materials, the airbag 11 utilizes the compression and expansion of gas to continuously store or compensate for part of the fluid in the pump outlet pipeline, so as to reduce the pressure fluctuation caused by the uneven discharge of the diaphragm pumping flow;

[0050] S3. When the gas in the air cavity of the airbag 11 leaks, under the high pressure of the medium cavity fluid, the volume of the medium cavity increases, causing the pressure stabilizing effect of the airbag 11 to gradually weaken. As the volume of the gas in the airbag 11 further decreases, the airbag 11 drives the guide rod 7 to move toward the top cover 8. When the upper magnetic sensor 2 of the sheath 1 detects the magnet 3 on the guide rod 7, the upper magnetic sensor 2 will detect a signal and transmit it to the PLC controller. After program processing, it will issue an instruction and transmit it to the alarm device to prompt the operator in the form of sound and light.

[0051] S4. When the airbag 11 ruptures, the air cavity and the medium cavity penetrate each other, and the fluid in the medium cavity flows into the airbag 11 through the rupture. The fluid flowing into the air cavity drives the airbag 11 and the guide rod 7 to move toward the connecting hole near the bottom of the shell 17. When the lower magnetic sensor 4 of the sheath 1 detects the magnet 3 on the guide rod 7, the lower magnetic sensor 4 will detect the signal and transmit it to the PLC controller. After program processing, it will issue an instruction and transmit it to the alarm device to prompt the operator in the form of sound and light.

[0052] According to the pressure variation range of the pump and the use experience, the pre-pressurized air bag of the present invention allows a volume utilization rate of 50-65% of the actual gas capacity, so the ratio between the pre-filled nitrogen pressure and the pump discharge pressure is limited to 1:2-1:3. Complying with this regulation can ensure a longer service life of the airbag 11. At the same time, considering the width of the temperature and flow frequency conversion range, the distance between the two probes is set to ensure that the airbag 11 is under the best force state and obtain the best attenuation result.

[0053] When the upper magnetic sensor 2 of the sheath 1 in the present invention detects the magnet 3 on the guide rod 7, the detected signal is transmitted to the PLC main control unit, and after being processed by the program, it is displayed in the form of sound and light. This indicates that the air bag is leaking and needs to be checked. After eliminating the cause of the leakage, the air bag can be inflated. When the lower magnetic sensor 4 of the sheath 1 detects the magnet 3 on the guide rod 7, it reminds the air bag airbag 11 that it may be damaged and needs to be replaced at an appropriate time;

[0054] Through the above design, the motion state of the airbag 11, which cannot be observed from the outside, can be indirectly obtained through the airbag stroke detection mechanism. This allows the airbag to be fully inspected during the operation of the pump, instead of being found damaged until the outlet pipeline generates large vibrations and noises, to ensure the normal operation of the equipment.

[0055] The same and similar parts between the various embodiments in this specification can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0056] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. An air bag detection device for a reciprocating piston diaphragm pump, comprising a housing (17) connected to an outlet pipe of the diaphragm pump, characterized in that: The shell (17) is provided with a cavity, an airbag (11) is provided in the cavity of the shell (17), an air cavity is formed between a top cover (8) of the shell (17) and the airbag (11), a medium cavity is formed between the airbag (11) and the bottom of the shell (17), a sheath (1) is provided on the top cover (8), the sheath (1) is a hollow structure, a guide rod (7) fixedly connected to the airbag (11) is provided in the sheath (1), and an airbag stroke detection mechanism cooperating with the airbag (11) is provided in the sheath (1); The airbag stroke detection mechanism comprises a sheath (1) and a guide rod (7), one end of the guide rod (7) is connected to the center of the airbag (11) through a connecting piece, a magnet (3) is arranged on the guide rod (7), an upper magnetic sensor (2) and a lower magnetic sensor (4) are arranged on the sheath (1), the outer surface of the blind hole internal thread where the upper magnetic sensor (2) and the lower magnetic sensor (4) are connected to the sheath (1) is scraped flat, and the detection end external threads of the upper magnetic sensor (2) and the lower magnetic sensor (4) are connected to the blind hole internal thread on one side of the sheath (1); The top cover (8) is provided with an inflation valve (6) which is in communication with the air cavity; When the airbag (11) is in a balanced state, the magnet (3) on the guide rod (7) is located between the upper magnetic sensor (2) and the lower magnetic sensor (4); The connecting piece comprises a guide rod (7), an upper sealing plate (9) having a through hole at the center, and a lower sealing plate (10) having a blind hole internal thread at the center; The guide rod (7) passes through the upper sealing plate (9) and is threadedly connected to the lower sealing plate (10), and the bottom of the airbag (11) is clamped between the upper sealing plate (9) and the lower sealing plate (10); The top cover (8) is provided with a pressure gauge (13) in communication with the air cavity, and the bottom of the housing (17) is provided with a connecting hole in communication with the medium cavity, and the medium cavity is connected to the outlet pipe of the pump through the connecting hole.

2. The air bag detection device for a reciprocating piston diaphragm pump according to claim 1, characterized in that: The upper sealing plate (9) and the lower sealing plate (10) are located at the bottom center of the airbag (11).

3. The air bag detection device for a reciprocating piston diaphragm pump according to claim 1, characterized in that: The protective sleeve (1) and the top cover (8) are detachably connected, a guide sleeve (5) is provided on the protective sleeve (1) near the top cover (8), and the guide rod (7) and the guide sleeve (5) are in sliding fit.

4. A method for using an air bag detection device for a reciprocating piston diaphragm pump, applied to the air bag detection device for a reciprocating piston diaphragm pump as claimed in any one of claims 1 to 3, characterized in that: The steps include: S1, the guide rod (7) and the sheath (1) are made of non-magnetic materials, the distance between the upper magnetic sensor (2) and the lower magnetic sensor (4) is set in advance according to the requirements of the flow rate conversion range of the diaphragm pump, nitrogen is filled into the airbag (11) through the inflation valve (6), and the inflation is stopped by observing the pressure gauge (13) until the airbag (11) reaches a preset value; S2. When the pump is conveying materials, the air bag (11) utilizes the compression and expansion of gas to continuously store or compensate for part of the fluid in the pump outlet pipeline, so as to reduce the pressure fluctuation caused by the uneven discharge of the pumping flow; S3. When gas leaks from the air cavity of the airbag (11), the volume of the medium cavity increases under the high pressure of the medium cavity fluid, causing the pressure stabilizing effect of the airbag (11) to gradually weaken. As the volume of the gas in the airbag (11) further decreases, the airbag (11) drives the guide rod (7) to move toward the top cover (8). When the upper magnetic sensor (2) of the sheath (1) detects the magnet (3) on the guide rod (7), the upper magnetic sensor (2) transmits the detected signal to the PLC controller, which issues a command after program processing and transmits it to the alarm device, prompting the operator in the form of sound and light; S4. When the airbag (11) ruptures, the air cavity and the medium cavity are penetrated, and the fluid in the medium cavity flows into the airbag (11) through the ruptured hole. The fluid flowing into the air cavity drives the airbag (11) and the guide rod (7) to move toward the connection hole near the bottom of the shell (17). When the lower magnetic sensor (4) of the sheath (1) detects the magnet (3) on the guide rod (7), the lower magnetic sensor (4) transmits the detected signal to the PLC controller. After being processed by the PLC program, an instruction is issued and transmitted to the alarm device, which prompts the operator in the form of sound and light.

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