Multi-plunger diaphragm pump alarm device

Abstract

The utility model relates to a multi-plunger diaphragm pump alarm device, which belongs to the technical field of diaphragm pumps, and comprises a pump cover, a pump cavity valve plate, a pressure taking plate and a plunger plate which are sequentially stacked and arranged in a sealing manner, a plurality of through holes are formed in the pressure taking plate; the plunger plate is provided with a diaphragm assembly corresponding to the through hole, the diaphragm assembly seals the through hole, and the diaphragm assembly is connected with a plunger in the plunger plate; a pressure detection assembly is further arranged on the pressure taking plate and used for conducting leakage alarm on the diaphragm assembly. According to the multi-plunger diaphragm detection alarm device, detection alarm can be performed on the multi-plunger diaphragm, so that an operator is prompted to handle in time, and the possibility of fluid leakage is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of diaphragm pumps, and particularly to an alarm device for a multi-plunger diaphragm pump. Background Art

[0002] A multi-plunger diaphragm pump is a pump product without seals and leaks that combines the dual characteristics of a plunger pump and a diaphragm pump. Multiple plungers in the mechanical drive cavity of the pump are driven by an eccentric push head, pushing and pulling multiple diaphragms connected thereto to move back and forth. Multiple groups of suction valves and discharge valves installed on the valve plate of the pump cavity are driven by the diaphragms to perform the functions of sucking and discharging liquid. When the diaphragm moves towards the drive mechanism side, the working pressure in the pump cavity is negative and liquid is sucked in. When the diaphragm moves towards the other side, the liquid is discharged. The liquid to be transported is separated from the plunger by the diaphragm in the pump cavity and only contacts the inner wall of the pump cavity, the check valve, and the inner side of the diaphragm in the pump, without contacting the plunger and the sealing device. This enables important parts such as the plunger to be in a completely good working state.

[0003] In the prior art, a polytetrafluoroethylene diaphragm (PTFE) is usually used as the diaphragm to separate the process fluid and the hydraulic oil. The plunger is directly connected to the diaphragm, and the movement of the plunger is transmitted to the diaphragm, causing the diaphragm to move back and forth. However, due to factors such as materials, manufacturing processes, and working conditions, the diaphragm may experience unpredictable ruptures, and diaphragm ruptures are likely to cause accidents such as liquid leakage. In the prior art, there are few diaphragm rupture alarm devices for multi-plunger diaphragm pumps.

[0004] Therefore, it is very necessary to develop an alarm device for a multi-plunger diaphragm pump to solve the above-mentioned technical problems. Utility Model Content

[0005] Based on this, an alarm device for a multi-plunger diaphragm pump is provided, which can monitor and alarm the rupture of the diaphragm during the use of the multi-plunger diaphragm pump.

[0006] To solve the above problems, an alarm device for a multi-plunger diaphragm pump is provided, including: a pump cover, a valve plate, a pressure-taking plate, and a plunger plate that are stacked in sequence and sealed; a plurality of through holes are provided on the pressure-taking plate; a diaphragm assembly corresponding to the through holes is provided on the plunger plate, the diaphragm assembly seals the through holes, and the diaphragm assembly is connected to the plungers inside the plunger plate; a pressure detection assembly is further provided on the pressure-taking plate for detecting leakage and alarming the diaphragm assembly.

[0007] Preferably, pressure-taking holes are provided on the pressure-taking plate around each of the through holes, and the pressure-taking holes penetrate through opposite sides of the pressure-taking plate; the pressure detection assembly communicates with the pressure-taking holes to detect the pressure change of the diaphragm assembly.

[0008] Preferably, the pressure detection components are arranged in a plurality of groups, each group of the pressure detection components corresponds to each group of the diaphragm components, and is respectively connected to each of the pressure taking holes for detecting and alarming a single diaphragm component.

[0009] Preferably, the pressure detection components are arranged as a group, and a group of the pressure detection components is used to detect and alarm all the diaphragm components.

[0010] Preferably, a pressure taking channel is provided on the pressure taking plate, and the pressure taking channel connects the pressure taking holes outside each through hole in series; a mounting hole connected to one of the pressure taking holes is provided on the outer circumferential surface of the pressure taking plate, and the pressure detection assembly is installed on the mounting hole.

[0011] Preferably, the pressure detection assembly includes a one-way valve, a connecting pipe and a pressure gauge, the input end of the one-way valve is connected to the mounting hole on the pressure plate, and the output end is sealed and connected to the detection end of the pressure gauge through the connecting pipe.

[0012] Preferably, the diaphragm assembly includes an outer diaphragm, a diaphragm spacer ring and an inner diaphragm stacked in sequence; a vacuum is drawn between the outer diaphragm and the inner diaphragm to form a monitoring cavity; the outer diaphragm is provided with a monitoring hole connected to the monitoring cavity; the diaphragm spacer ring is provided with a long hole running through both sides thereof, and a connecting hole connecting the long hole and the monitoring cavity is provided on the inner ring side wall of the diaphragm spacer ring; the monitoring hole, the long hole and the pressure taking hole are arranged correspondingly.

[0013] Preferably, a mounting groove is provided on the plunger plate, a plunger cylinder is provided in the middle of the mounting groove, and the plunger cylinder is used for mounting the plunger; the diaphragm assembly is installed in the mounting groove.

[0014] Preferably, a circle of positioning grooves is provided around the bottom of the installation groove; a circle of positioning strips protrudes from the side of the inner diaphragm away from the outer diaphragm; and the positioning strips are embedded in the positioning grooves.

[0015] Beneficial effects:

[0016] The above-mentioned multi-plunger diaphragm pump alarm device has multiple through holes on the pressure plate, and each through hole corresponds to each diaphragm assembly, and a pressure detection assembly is also provided on the pressure plate. The pressure detection assembly is used to alarm for leakage of multiple diaphragm assemblies. Then, when the diaphragm of the diaphragm assembly ruptures, the pressure detection assembly can detect and alarm, thereby prompting the operator to handle it in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1Schematic structural diagram of the alarm device of a multi-plunger diaphragm pump in an embodiment;

[0018] Figure 2 Explosion schematic of the alarm device of a multi-plunger diaphragm pump in an embodiment Figure 1 ;

[0019] Figure 3 Explosion schematic of the alarm device of a multi-plunger diaphragm pump in an embodiment Figure 2 ;

[0020] Figure 4 Schematic structural diagram of the pressure detection component in an embodiment;

[0021] Figure 5 Schematic structural diagram of the diaphragm assembly mounted on the plunger plate in an embodiment;

[0022] Figure 6 Schematic structural diagram of the plunger plate in an embodiment;

[0023] Figure 7 Explosion schematic of the diaphragm assembly in an embodiment;

[0024] Figure 8 Schematic structural diagram of the diaphragm spacer ring in an embodiment;

[0025] Figure 9 Schematic structural diagram of the inner diaphragm in an embodiment;

[0026] Figure 10 Schematic structural diagram of the pressure-taking plate in an embodiment Figure 1 ;

[0027] Figure 11 Schematic structural diagram of the pressure-taking plate in an embodiment Figure 2 .

[0028] Reference numerals: 1. Pump cover; 11. Feed inlet; 12. Discharge outlet; 13. Feed cavity; 14. Discharge cavity; 2. Pump chamber valve plate; 21. Feed hole; 22. Discharge hole; 23. Material cavity; 3. Pressure-taking plate; 31. Through hole; 32. Pressure-taking hole; 33. Pressure-taking channel; 4. Plunger plate; 41. Plunger cylinder; 42. Installation groove; 421. Positioning groove; 5. Diaphragm assembly; 51. Outer diaphragm; 511. Monitoring hole; 52. Diaphragm spacer ring; 521. Long strip hole; 522. Communication hole; 53. Inner diaphragm; 531. Positioning strip; 6. Pressure detection component; 61. Check valve; 62. Connecting pipe; 63. Pressure gauge. Detailed implementation manners

[0029] In order to make the objectives, technical solutions and advantages of the present application more clear and understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0030] It should be noted that the illustrations provided in this embodiment only schematically illustrate the basic concept of the present application. Therefore, only the components related to the present application are shown in the drawings, rather than being drawn according to the number, shape and size of the components in actual implementation. The type, quantity and proportion of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0031] The structures, proportions, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in this technology to understand and read, and are not used to limit the limiting conditions under which the present application can be implemented. Therefore, they do not have technical substance significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present application can produce and the objectives that can be achieved, should still fall within the scope covered by the technical content disclosed in the present application.

[0032] The orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "middle", "longitudinal", "transverse", "horizontal", "inner", "outer", "radial", "circumferential", etc. cited in this specification is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of simplified description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0033] In the prior art, there are many methods for the alarm of the diaphragm rupture of the metering pump. The common method is to set the diaphragm on the process fluid side and the diaphragm on the hydraulic oil side in the sealing grooves on both sides of the intermediate ring. Therefore, when the pump is running, the gas between the diaphragm on the hydraulic oil side and the diaphragm on the process fluid side is discharged through the one-way valve connected to the intermediate ring. Moreover, if the diaphragm on one side ruptures, the leaked fluid will flow out through the through hole on the intermediate ring and trigger alarm instruments such as pressure gauges after passing through the one-way valve. However, there are few diaphragm rupture alarm devices for multi-plunger diaphragm pumps in this regard. Therefore, it is very necessary to develop an alarm device for multi-plunger diaphragm pumps to achieve the above-mentioned alarm work for diaphragm rupture.

[0034] The following will describe in detail a multi-plunger diaphragm pump alarm device provided in this embodiment with reference to the accompanying drawings. Please refer to Figures 1 - 4As shown in the figure, it includes: a pump cover 1, a pump chamber valve plate 2, a pressure plate 3, and a plunger plate 4 that are stacked in sequence and sealed. The pressure plate 3 is provided with a plurality of through holes 31. The plunger plate 4 is provided with a diaphragm assembly 5 corresponding to the through holes 31. The diaphragm assembly 5 is used to seal the through holes 31. The diaphragm assembly 5 is correspondingly connected to the plunger inside the plunger plate 4. A pressure detection assembly 6 is also provided on the pressure plate 3 for leakage alarm of the diaphragm assembly 5.

[0035] In this embodiment, by opening a plurality of through holes 31 on the pressure plate 3, and each through hole 31 corresponds to each diaphragm assembly 5 on the plunger plate 4. One side of the through hole 31 is sealed by the diaphragm assembly 5. At the same time, the pump chamber valve plate 2 is fitted and installed on the pressure plate 3. A sealed chamber is formed between the pump chamber valve plate 2 and the pressure plate 3. A pressure detection assembly 6 is also provided on the pressure plate 3 for leakage alarm of the diaphragm assembly 5. Then, when the diaphragm of the diaphragm assembly 5 ruptures, it can be detected and alarmed by the pressure detection assembly 6, so as to prompt the operator to process it in time.

[0036] In this embodiment, it should be noted that the pressure plate 3 is set to be annular, and the number of through holes 31 can be set to three, five or more. There is no specific limitation in this embodiment. Only taking three through holes 31 as an example for illustration. The three through holes 31 are distributed in a circular circumferential array with the center of the pressure plate 3 as the center. The number of diaphragm assemblies 5 provided is the same as the number of through holes 31 provided. Only taking three diaphragm assemblies 5 as an example for illustration in this embodiment.

[0037] In some embodiments, please refer to Figure 2 、 Figure 5 As shown in the figure, three installation grooves 42 are opened on the plunger plate 4. The three installation grooves 42 are distributed in a circumferential array with the center of the plunger plate 4 as the center. The installation grooves 42 are adapted to the diaphragm assembly 5, that is, the diaphragm assembly 5 is fitted and installed on the installation grooves 42. At the same time, a plunger cylinder 41 is provided at the bottom of the installation groove 42 and penetrates through both sides of the plunger plate 4. A plunger is installed in the plunger cylinder 41. The plunger reciprocates in the plunger cylinder 41 under the action of a power source. The plunger is connected to the diaphragm assembly 5. Therefore, the plunger reciprocates in the plunger cylinder 41 under the action of the power source, and at the same time drives the diaphragm assembly 5 to flap back and forth, thereby realizing the liquid suction or liquid discharge action. This part is a mature technology in this field and will not be described in too much detail here.

[0038] In some embodiments, please refer to Figures 5 - 9As shown, the diaphragm assembly 5 includes an outer diaphragm 51, a diaphragm spacer ring 52, and an inner diaphragm 53 stacked in sequence. The materials of the outer diaphragm 51 and the inner diaphragm 53 are usually PTFE diaphragms. The outer diaphragm 51 and the inner diaphragm 53 are mutually adhered and a monitoring cavity is formed therebetween. The monitoring cavity between the outer diaphragm 51 and the inner diaphragm 53 is evacuated. The diaphragm spacer ring 52 is clamped between the outer diaphragm 51 and the inner diaphragm 53, that is, located in the monitoring cavity. A monitoring hole 511 is provided on the outer diaphragm 51. The monitoring hole 511 penetrates through its opposite sides, and two monitoring holes 511 are provided. The connection line between the two monitoring holes 511 passes through the center of the circle on the outer diaphragm 51. A long hole 521 penetrating through both sides of the diaphragm spacer ring 52 is provided on the diaphragm spacer ring 52. Two long holes 521 are also provided. The connection line between the two long holes 521 passes through the center of the circle on the diaphragm spacer ring 52. At the same time, when assembling the diaphragm assembly 5, the positions of the monitoring holes 511 on the outer diaphragm 51 and the long holes 521 on the diaphragm spacer ring 52 are corresponding. A circle of communication holes 522 communicating with the long holes 521 is provided on the inner circumferential side wall of the diaphragm spacer ring 52. Through the setting of the communication holes 522, the monitoring cavity, the long holes 521, and the monitoring holes 511 can be formed in a conducting state. Then, by performing a vacuum pumping process at the position of the monitoring holes 511 on the outer diaphragm 51, the internal monitoring cavity can be evacuated to a vacuum state. When the outer diaphragm 51 or the inner diaphragm 53 is ruptured, the pressure in the monitoring cavity between the outer diaphragm 51 and the inner diaphragm 53 will change. Then, the pressure detection component 6 is used to detect this pressure change to achieve detection and alarm. Therefore, the pressure detection component 6 is used to detect the pressure change between the outer diaphragm 51 and the inner diaphragm 53. When the set value is reached, the pressure detection component 6 will alarm. In this embodiment, the long holes 521 are selected to facilitate alignment and assembly with the monitoring holes 511.

[0039] In some embodiments, please refer to Figures 5 - 9 As shown, when installing the diaphragm assembly 5, for better sealing performance, a circle of positioning strips 531 protrudes from the side of the inner diaphragm 53 facing away from the outer diaphragm 51. A circle of positioning grooves 43 is provided at the bottom of the installation groove 42. The positioning groove 43 is concentric with the plunger cylinder 41, and the positioning groove 43 is adapted to the positioning strips 531. During installation, the positioning strips 531 on the inner diaphragm 53 are embedded in the positioning grooves 43, so as to better realize the installation between the diaphragm assembly 5 and the plunger plate 4.

[0040] In this embodiment, it should also be noted that, please refer to Figure 3 、 Figure 10 and Figure 11 As shown, pressure tapping holes 32 are provided on the pressing plate 3 around the periphery of each through hole 31. The pressure tapping holes 32 penetrate through the opposite sides of the pressing plate 3, and two pressure tapping holes 32 are provided. The connection line between the two pressure tapping holes 32 passes through the center of the circle of the through hole 31. The pressure detection component 6 (such asFigure 4 The pressure-taking holes 32 are connected as shown. When the pressure-taking plate 3 and the plunger plate 4 are butt-jointed and installed, the positions of the pressure-taking holes 32 on the pressure-taking plate 3 are aligned with the positions of the monitoring holes 511 on the diaphragm assembly 5. Thus, a conducting state is formed among the pressure detection assembly 6, the pressure-taking holes 32, and the monitoring holes 511. Then, when either the outer diaphragm 51 or the inner diaphragm 53 ruptures, the monitoring cavity will lose vacuum at this time, and then the pressure detection assembly 6 monitors the pressure change between the outer diaphragm 51 and the inner diaphragm 53. When the set value is reached, the pressure detection assembly 6 will give an alarm.

[0041] In an implementable manner, multiple groups of pressure detection assemblies 6 are provided. Each group of pressure detection assemblies 6 corresponds to each group of diaphragm assemblies 5 respectively, and is respectively connected to each pressure-taking hole 32 to detect and alarm for a single diaphragm assembly 5. It can be understood that multiple groups of pressure detection assemblies 6 are provided on the pressure-taking plate 3, and each group of pressure detection assemblies 6 monitors each group of diaphragm assemblies 5. Then, when a single diaphragm assembly 5 ruptures, a separate group of pressure detection assemblies 6 will detect it.

[0042] In another implementable manner, the pressure detection assembly 6 is provided as a single group, and the single group of pressure detection assemblies 6 is used to detect and alarm for all the diaphragm assemblies 5. In this way, only a single group of pressure detection assemblies 6 is used to detect and alarm for all the diaphragm assemblies 5 at the same time. That is to say, as long as a single group of diaphragm assemblies 5 ruptures, the pressure detection assembly 6 will detect and alarm.

[0043] Specifically, a pressure-taking channel 33 is provided on the side of the pressure-taking plate 3 facing away from the plunger plate 4. The pressure-taking channel 33 serially conducts the pressure-taking holes 32 outside each through hole 31. An installation hole communicating with one of the pressure-taking holes 32 is provided on the outer circumferential surface of the pressure-taking plate 3, and the pressure detection assembly 6 is installed on this installation hole. Then, by using the pressure-taking channel 33, multiple pressure-taking holes 32 can be conducted at the same time, and the pressure detection assembly 6 only needs to communicate with one of the pressure-taking holes 32 to conduct and detect all the pressure-taking holes 32.

[0044] Please refer to Figure 4 、 Figure 10 and Figure 11As shown, in this embodiment, it is also necessary to explain that the pressure detection assembly 6 includes a one-way valve 61, a pipe 62 and a pressure gauge 63. The input end of the one-way valve 61 is connected to the mounting hole on the pressure plate 3, and the output end thereof is sealed and connected to the detection end of the pressure gauge 63 through the pipe 62. When either the outer diaphragm 51 or the inner diaphragm 53 ruptures, the monitoring chamber will lose vacuum, the air pressure will push the one-way valve 61 into the pipe 62, the value of the pressure gauge 63 will reach the upper limit of the set value, and the pressure gauge 63 will alarm, which can determine that the diaphragm is ruptured. The pressure gauge 63 can also be connected to a remote alarm buzzer to remotely prompt the customer that the diaphragm needs to be replaced. Preferably, a three-way valve (not shown in the figure) can also be externally connected to the pipe 62, and a vacuum pumping device can be externally connected through the three-way valve, and the vacuum pumping device can be used to facilitate vacuuming between the outer diaphragm 51 and the inner diaphragm 53.

[0045] Please refer to Figure 2 , Figure 3 As shown, in the present embodiment, it is also necessary to explain that a feed port 11 and a discharge port 12 are further provided on the side of the pump cover 1 facing away from the pump chamber valve plate 2, and a feed chamber 13 and a discharge chamber 14 are provided on the side of the pump cover 1 facing the pump chamber valve plate 2. The feed chamber 13 and the discharge chamber 14 are independently arranged and are annular in shape. The feed chamber 13 and the discharge chamber 14 are arranged cocentrically with the pump cover 1, the feed port 11 is connected with the feed chamber 13, and the discharge port 12 is connected with the discharge chamber 14.

[0046] Three feed holes 21 and three discharge holes 22 are arranged on the side of the pump chamber valve plate 2 facing the pump cover 1. The three feed holes 21 are distributed in an array around the central circumference of the pump chamber valve plate 2, and the three discharge holes 22 are also distributed in an array around the central circumference of the pump chamber valve plate 2 and are distributed on the periphery of the three feed holes 21. The three feed holes 21 correspond to the feed chamber 13, and the three discharge holes 22 correspond to the discharge chamber 14. Of course, a suction valve is arranged in the feed hole 21, and a discharge valve is arranged in the discharge hole 22. When feeding, the suction valve in the feed hole 21 is in an open state, and the discharge valve of the discharge hole 22 is in a closed state; when discharging, the suction valve in the feed hole 21 is in a closed state, and the discharge valve of the discharge hole 22 is in an open state. This part is a mature technology in this field and will not be described in detail here.

[0047] Three material chambers 23 are arranged on the side of the pump chamber valve plate 2 facing away from the pump cover 1. The three material chambers 23 are arranged in an array around the central circumference of the pump chamber valve plate 2, and a single material chamber 23 is exactly connected to the feed hole 21 and the discharge hole 22, that is, the feed hole 21 and the discharge hole 22 arranged in the same radial direction are a group, which is exactly connected to the material chamber 23. Therefore, through the reciprocating action of the plunger, the diaphragm assembly 5 is agitated back and forth, and then the feed from the feed port 11 or the discharge from the discharge port 12 is realized. When working, it reciprocates between the starting point and the end point,

[0048] Implementation principle of this embodiment: By externally connecting a vacuum pumping device to the three-way valve on the connecting pipe 62, vacuum treatment can be carried out between the pump chamber valve plate 2 and the pressure-taking plate 3, between the pressure-taking plate 3 and the plunger plate 4, and between the outer diaphragm 51 and the inner diaphragm 53. When the outer diaphragm 51 ruptures, the process fluid will enter the gap between the outer diaphragm 51 and the inner diaphragm 53. When the inner diaphragm 53 ruptures, the hydraulic oil will enter the gap between the outer diaphragm 51 and the inner diaphragm 53. No matter which side of the diaphragm ruptures, at this time, the vacuum between the outer diaphragm 51 and the inner diaphragm 53 will be instantly lost, and the air pressure will enter the pressure-taking hole 32 through the monitoring hole 511, and enter the connecting pipe 62 by pushing open the one-way valve 61. When the value of the pressure gauge 63 reaches the upper limit of the set value, the pressure gauge 63 alarms, and it can be judged that the diaphragm ruptures; Since the pressure-taking channels 33 are used to connect multiple pressure-taking holes 32 in series, therefore, as long as any diaphragm assembly 5 corresponding to the pressure-taking hole 32 ruptures, detection and alarm can be achieved.

[0049] It should be noted that: The entire device is controlled by the total control button. Since the devices matched with the control button are common devices and belong to the existing mature technologies, the electrical connection relationship and the specific circuit structure thereof will not be described in detail herein.

[0050] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as these combinations of technical features do not conflict, they should be considered as the scope described in this specification.

[0051] The above-described embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A multi-plunger diaphragm pump alarm device, characterized in that, Comprising: A pump cover (1), a pump chamber valve plate (2), a pressure taking plate (3), and a plunger plate (4) which are stacked in sequence and hermetically arranged; A plurality of through holes (31) are provided on the pressure taking plate (3); A diaphragm assembly (5) corresponding to the through holes (31) is provided on the plunger plate (4), the diaphragm assembly (5) seals the through holes (31), and the diaphragm assembly (5) is connected to a plunger inside the plunger plate (4); A pressure detection assembly (6) is further provided on the pressure taking plate (3) for performing leakage alarm on the diaphragm assembly (5).

2. The multi-plunger diaphragm pump alarm device according to claim 1, characterized in that Pressure taking holes (32) are provided on the pressure taking plate (3) around each of the through holes (31), and the pressure taking holes (32) penetrate through opposite sides of the pressure taking plate (3); The pressure detection assembly (6) communicates with the pressure taking holes (32) to detect the pressure change of the diaphragm assembly (5).

3. The multi-plunger diaphragm pump alarm device according to claim 2, characterized in that The pressure detection assembly (6) is provided in multiple groups, each group of the pressure detection assembly (6) corresponds to each group of the diaphragm assembly (5) respectively, and respectively corresponds to communicate with each of the pressure taking holes (32) for detecting and alarming a single diaphragm assembly (5).

4. The multi-plunger diaphragm pump alarm device according to claim 2, characterized in that The pressure detection assembly (6) is provided in one group, and one group of the pressure detection assembly (6) is used for detecting and alarming all the diaphragm assemblies (5).

5. The multi-plunger diaphragm pump alarm device according to claim 4, characterized in that A pressure taking channel (33) is provided on the pressure taking plate (3), and the pressure taking channel (33) serially conducts the pressure taking holes (32) outside each of the through holes (31); An installation hole communicating with one of the pressure taking holes (32) is provided on the outer circumferential surface of the pressure taking plate (3), and the pressure detection assembly (6) is installed on the installation hole.

6. The multi-plunger diaphragm pump alarm device according to claim 5, characterized in that The pressure detection assembly (6) includes a check valve (61), a connecting pipe (62), and a pressure gauge (63), the input end of the check valve (61) communicates with the installation hole on the pressure taking plate (3), and its output end is hermetically connected to the detection end of the pressure gauge (63) through the connecting pipe (62).

7. The multi-plunger diaphragm pump alarm device according to claim 3 or 5, characterized in that The diaphragm assembly (5) includes an outer diaphragm (51), a diaphragm spacer ring (52), and an inner diaphragm (53) which are stacked in sequence; A monitoring cavity is formed by evacuating the space between the outer diaphragm (51) and the inner diaphragm (53); A monitoring hole (511) is provided on the outer diaphragm (51); A long hole (521) penetrating through both sides of the diaphragm spacer ring (52) is provided on the diaphragm spacer ring (52), and a communication hole (522) communicating the long hole (521) and the monitoring cavity is provided on the inner circumferential side wall of the diaphragm spacer ring (52); The monitoring hole (511), the long strip hole (521), and the pressure taking hole (32) are arranged corresponding to each other.

8. The multi-plunger diaphragm pump alarm device according to claim 7, characterized in that An installation groove (42) is provided on the plunger plate (4), and a plunger cylinder (41) is provided at the middle position of the installation groove (42) for installing a plunger; The diaphragm assembly (5) is installed in the installation groove (42).

9. The multi-plunger diaphragm pump alarm device according to claim 8, characterized in that A circumferential positioning groove (421) is provided on the bottom circumference of the installation groove (42); A circumferential positioning strip (531) protrudes from the side of the inner diaphragm (53) facing away from the outer diaphragm (51); The positioning strip (531) is embedded in the positioning groove (421).

Images