Cylinder bag pump device, cylinder bag pump and pressure taking assembly

Abstract

A cartridge pump device, a cartridge pump and a pressure taking assembly, the cartridge pump device comprising: a cartridge pump comprising a housing having an inlet for inputting fluid to be pressurized and a residual outlet for discharging residual fluid or impurities; an inner housing arranged in the housing, the inner housing being provided with a first stage impeller and a second stage impeller downstream of the first stage impeller, the inner housing being provided with a through hole, and a first flow channel being formed in the inner housing between a liquid outlet of the first stage impeller and a liquid inlet of the second stage impeller, the through hole being in communication with the first flow channel; and a pressure taking assembly, the pressure taking assembly being capable of penetrating into the housing from the residual outlet of the housing and being in communication with the through hole for measuring the pressure in the first flow channel. The application can avoid the problem of increasing cost and leakage risk caused by the need for additional drilling and additional sealing elements in the housing when testing the required net positive suction head of the first stage impeller.

Description

Technical Field

[0001] This utility model relates to a bag pump device, a bag pump, and a pressure tapping assembly, and particularly to a bag pump device and a pressure tapping test structure for the bag pump. Background Technology

[0002] During pump operation, cavitation is a key factor affecting pump performance, service life, and operational stability. The required net positive suction head (NPSH), as a core indicator of a pump's resistance to cavitation, is crucial for accurate testing, especially for pump design optimization, performance evaluation, and safe operation. For multistage pumps, the current industry standard for testing NPSH typically involves indirectly measuring the NPSH of the first-stage impeller based on the decrease in the pump's total outlet head. This method monitors changes in the overall total outlet head of the multistage pump to calculate the critical performance state of the first-stage impeller during cavitation, thus determining the NPSH value and meeting basic testing requirements to a certain extent.

[0003] However, in practical applications, to more accurately obtain the cavitation characteristics of the first-stage impeller and avoid interference from subsequent impellers in the multistage pump, it is often necessary to directly take pressure from the first-stage impeller to test its individual required net positive suction head (NPSH). Under this testing requirement, it is necessary to accurately measure two key parameters: the inlet pressure and the outlet pressure of the first-stage impeller. Only through calculation and analysis of these two pressure parameters can the required NPSH data of the first-stage impeller be accurately obtained, thus providing a more accurate basis for improving the structure of the first-stage impeller and enhancing its anti-cavitation performance in multistage pumps. Currently, double-casing multistage pumps generally adopt a bag pump structure, which has an outer shell and an inner shell located inside the outer shell. All multistage impellers of the multistage pump are concentrated in the internal space of the inner shell. Since the first-stage impeller is located inside the inner shell, its outlet pressure cannot be directly measured from the outside. To obtain this pressure parameter, an additional pressure tap must be opened on the outer shell of the bag pump. A pressure measurement channel is built through the pressure tap to transmit the outlet pressure of the first-stage impeller inside the inner shell to the external measuring equipment. However, the operation of making additional holes in the outer casing will cause a series of problems: After the test is completed, in order to ensure the integrity and sealing performance of the bag pump casing, the pressure tap must be sealed. Therefore, expensive special sealing parts are required, which increases the manufacturing and testing costs of multi-stage pumps. Secondly, even if special sealing parts are used, the additional pressure tap will still damage the original structural integrity of the casing and increase the risk of media leakage. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a bag pump device, a bag pump and a pressure tapping assembly, which can avoid the problem of increased cost and leakage risk caused by the need for additional drilling and sealing of the housing when testing the required net positive suction head of the first stage impeller.

[0005] The specific technical solution of this utility model embodiment is as follows: A bag pump device, the bag pump device comprising: A bag pump includes a housing having an inlet for inputting fluid to be pressurized and a discharge port for discharging residual fluid or impurities; an inner shell disposed within the housing, wherein a first-stage impeller and a second-stage impeller located downstream of the first-stage impeller are disposed within the inner shell, a through hole is provided on the inner shell, and a first flow channel is formed within the inner shell between the liquid outlet of the first-stage impeller and the liquid inlet of the second-stage impeller, the through hole communicating with the first flow channel; A pressure tapping assembly is inserted into the housing through the discharge port of the housing and communicates with the through hole to measure the pressure in the first flow channel.

[0006] Preferably, the through hole is a threaded hole; the pressure tapping component can be threadedly connected to the through hole.

[0007] Preferably, a second flow channel is formed between the inner shell and the outer shell, the inlet is connected to the liquid inlet of the first stage impeller through the second flow channel, and the portion of the pressure tapping assembly that penetrates into the outer shell is located in the second flow channel; the inner shell has an end wall that forms a first preset angle with the axial direction of the bag pump, the end wall is located between the first flow channel and the second flow channel, the through hole is provided on the end wall, the outer shell has a peripheral wall parallel to the axial direction of the pump device, the discharge port is provided on the peripheral wall, and the pressure tapping assembly includes a flexible hose.

[0008] Preferably, the pressure tapping assembly includes: a first connector, the first end of which has an external thread to be threadedly connected to the through hole; A pipeline, the first end of which is connected to the second end of the first connector.

[0009] Preferably, the pump device further includes: A flange with a through hole is connected to the discharge port such that the through hole is opposite to the discharge port, and the second end of the pipeline is connected to the through hole.

[0010] Preferably, the second end of the first connector is a compression fitting structure, and the connection between the first end of the pipeline and the second end of the first connector is achieved through the compression fitting structure.

[0011] Preferably, the pressure tapping assembly further includes: The second connector has an external thread at its first end to allow it to be threadedly connected to the through hole; the second end of the second connector is a compression fitting structure; the second end of the pipeline is connected to the second end of the second connector, thereby enabling the connection between the second end of the pipeline and the through hole to be achieved through the second connector.

[0012] Preferably, the through hole is opposite to the discharge port, and the pressure tapping assembly includes: A rigid tube body, the first end of which is sealed to the through hole; The inner shell has a peripheral wall located between the first water channel and the second water channel, the through hole is provided on the peripheral wall of the inner shell, the outer shell has a peripheral wall parallel to the axial direction of the pump device, and the discharge port is provided on the peripheral wall of the outer shell. The pump assembly also includes: A flange with a through hole is connected to the discharge port so that the through hole is opposite to the discharge port, and the second end of the pipe body is connected to the through hole.

[0013] Preferably, the first end of the tube body abuts against the periphery of the through hole to enable communication between the two, and a first sealing element is provided between the first end of the tube body and the inner shell around the through hole; or, The tube is inserted into the through hole to connect the two, and a first sealing element is provided between the outer wall of the tube and the inner wall of the through hole.

[0014] Preferably, the pump device includes: A sealing component that can seal the through hole.

[0015] A bag pump, the bag pump comprising: It has an inlet for inputting the fluid to be pressurized and a discharge port for discharging residual fluid or impurities; An inner shell is disposed within the outer shell. A first-stage impeller and a second-stage impeller located downstream of the first-stage impeller are disposed within the inner shell. A through hole is provided on the inner shell. A first flow channel is formed within the inner shell between the liquid outlet of the first-stage impeller and the liquid inlet of the second-stage impeller. A second flow channel is provided between the inner shell and the outer shell. The inlet communicates with the liquid inlet of the first-stage impeller through the second flow channel, and the through hole connects the first flow channel and the second flow channel. The through hole is located near the discharge port, allowing an external pipeline to enter the second flow channel from the discharge port and connect to the through hole, thereby enabling pressure testing of the second flow channel; A sealing component is provided to seal the through hole so that the bag pump can operate normally when tested without external pressure tapping components.

[0016] A pressure tapping assembly is provided for measuring the internal pressure of a bag pump. The bag pump includes a housing and an inner shell disposed within the housing. A first flow channel is formed within the inner shell, and a through hole communicating with the first flow channel is provided on the inner shell. A second flow channel is provided between the housing and the inner shell. A discharge port is provided on the housing, and the discharge port communicates with the second flow channel. The pressure tapping assembly can penetrate into the housing through the discharge port and can pass through the second flow channel and communicate with the through hole to measure the pressure within the first flow channel.

[0017] Preferably, the pressure tapping assembly includes a pipe that can pass through the second flow channel, a first connector connected to a first end of the pipe, and a second connector connected to a second end of the pipe. The first connector can be sealed to the inner shell, so that the pipe is connected to the first flow channel and isolated and sealed from the second flow channel. The second connector can be connected to the discharge port, so that the pipe is connected to the detection equipment and isolated and sealed from the second flow channel.

[0018] Preferably, the first end of the first connector has an external thread to connect to the through hole of the inner shell of the bag pump, and the second end of the first connector is connected to the first end of the pipeline. The pressure tapping assembly includes: a flange with a through hole for connection to the discharge port of the bag pump, and a second end of the pipeline connected to the through hole.

[0019] Preferably, the second end of the first connector is a compression fitting structure, and the connection between the first end of the pipeline and the second end of the first connector is achieved through the compression fitting structure; The first end of the second connector has an external thread to be threaded into the through hole; the second end of the pipeline is connected to the second end of the second connector; the second end of the second connector is a compression fitting structure, so that the connection between the second end of the pipeline and the second end of the second connector is achieved through the compression fitting structure.

[0020] The technical solution of this utility model has the following significant beneficial effects: The pump device in this application has a through hole on its inner shell that communicates with a first flow channel formed inside the outer shell between the outlet of the first-stage impeller and the inlet of the second-stage impeller. A pressure-tapping assembly is inserted into the outer shell through the discharge port, thus communicating with the through hole. This allows the pressure-tapping assembly to tap the fluid after it has been pressurized by the first-stage impeller. Then, by combining this with pressure tapping at the pump inlet, the required net positive suction head (NPSH) of the first-stage impeller can be calculated. This method eliminates the need for additional drilling and sealing on the outer shell when testing the required NPSH of the first-stage impeller, effectively reducing costs and avoiding increased leakage risks on the outer shell.

[0021] Specific embodiments of the present invention are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope. Features described and / or shown for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments. Attached Figure Description

[0022] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.

[0023] Figure 1 This is a cross-sectional view of the bag pump device in the first embodiment of this utility model; Figure 2 for Figure 1 Enlarged schematic diagram of the pressure extraction component; Figure 3 This is a schematic diagram of the pressure tapping assembly and flange of the bag pump device in the first embodiment of this utility model; Figure 4 This is a schematic diagram of the pressure tapping component of the bag pump device in the second embodiment of this utility model.

[0024] The reference numerals in the above figures are as follows: 1. Outer shell; 11. Inlet; 12. Outlet; 13. Drain outlet; 2. Inner shell; 21. Through hole; 22. First flow channel; 3. First stage impeller; 4. Second stage impeller; 5. Pressure tapping assembly; 51. First connector; 52. Pipeline; 53. Second connector; 54. Pipe body; 55. First seal; 6. Second flow channel; 7. Flange; 71. Through hole; 8. Second seal. Detailed Implementation

[0025] The details of this utility model can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of this utility model described herein are only for explaining the purpose of this utility model and should not be construed as limiting this utility model in any way. Under the teachings of this utility model, those skilled in the art can conceive of any possible modifications based on this utility model, and these should all be considered to fall within the scope of this utility model. It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there may be an intervening element. The terms "mounted," "connected," and "connected" should be interpreted broadly, for example, it can be a mechanical connection or an electrical connection, or it can be a connection within two elements, which can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0027] To avoid the increased cost and leakage risk associated with requiring additional drilling and sealing of the casing when testing the necessary net positive suction head (NPSH) of the first-stage impeller, this application proposes a pump device. Figure 1 This is a cross-sectional view of the bag pump device in the first embodiment of this utility model. Figure 2 for Figure 1 An enlarged schematic diagram of the voltage extraction component is shown below. Figure 1 and Figure 2As shown, the bag pump device may include: a bag pump, the bag pump including a housing 1 having an inlet 11 for inputting the fluid to be pressurized and a discharge port 13 for discharging residual fluid or impurities; an inner housing 2 disposed within the housing 1, the inner housing 2 having a first-stage impeller 3 and a second-stage impeller 4 disposed therein, the inner housing 2 having a through hole 21, and a first flow channel 22 formed within the inner housing 2 between the liquid outlet of the first-stage impeller 3 and the liquid inlet of the second-stage impeller 4, the through hole 21 communicating with the first flow channel 22; and a pressure tapping assembly 5, the pressure tapping assembly 5 being able to penetrate into the housing 1 from the discharge port 13 of the housing 1 and communicating with the through hole 21, for measuring the pressure within the first flow channel 22.

[0028] The pump device in this application can have a through hole 21 on the inner shell 2, which communicates with the first flow channel 22 formed inside the inner shell 2 between the liquid outlet of the first-stage impeller 3 and the liquid inlet of the second-stage impeller 4. A pressure tapping assembly 5 is inserted into the outer shell 1 through the discharge port 13, thereby communicating with the through hole 21. This allows the pressure tapping assembly 5 to tap the fluid after it has been pressurized by the first-stage impeller 3. Then, by combining this with pressure tapping at the pump inlet 11, the required net positive suction head (NPSH) of the first-stage impeller 3 can be calculated. Through this method, when testing the required NPSH of the first-stage impeller, there is no need to drill additional holes or add seals to the outer shell 1, effectively reducing costs and avoiding the increased risk of leakage on the outer shell 1.

[0029] like Figure 1 As shown, the pump unit may include: a housing 1 having an inlet 11, an outlet 12, and a discharge port 13; an inner housing 2 disposed within the housing 1; and a pressure tapping assembly 5. The inlet 11 is used to input the fluid to be pressurized into the pump unit; the outlet 12 is used to output the pressurized fluid from the pump unit. The discharge port 13 is used to discharge residual fluid and sediment from the housing 1, and to empty the fluid inside the pump before it is not operated for an extended period.

[0030] like Figure 1As shown, the outer shell 1 encloses the inner shell 2, enabling the entire pump unit to withstand greater internal pressure. The inner shell 2 houses a first-stage impeller 3 and a second-stage impeller 4 located downstream of the first-stage impeller 3. Of course, as feasible, the inner shell 2 can also house more stages of impellers, such as a third-stage impeller downstream of the second-stage impeller 4, a fourth-stage impeller downstream of the third-stage impeller, and so on. The inner shell 2 may have a through-hole 21, which communicates with a first flow channel 22 formed within the inner shell 2, connecting the outlet of the first-stage impeller 3 to the inlet of the second-stage impeller 4. The pressure tapping assembly 5 can penetrate into the outer shell 1 through the discharge port 13 and communicate with the through-hole 21 to measure the pressure within the first flow channel 22. In this manner, the pressure tapping assembly 5 can tap the pressure of the fluid after it has been pressurized by the first-stage impeller 3. When testing the required net positive suction head (NPSH) of the first-stage impeller, there is no need to drill additional holes or add seals to the housing 1, which effectively reduces costs and avoids the problem of increased leakage risk on the housing 1.

[0031] After the pressure tapping assembly 5 taps the fluid pressurized by the first-stage impeller 3, it can seal the through hole 21, thereby ensuring the normal operation of the pump device. For example, the pump device may include a sealing component that can seal the through hole 21.

[0032] Alternatively, the through hole 21 can be a threaded hole. In this configuration, the pressure tapping assembly 5 can be threadedly connected to the through hole 21, thus facilitating the mating of the pressure tapping assembly 5 and the through hole 21 while ensuring a certain level of connection sealing. For example, Figure 3 This is a schematic diagram of the pressure tapping assembly and flange of the bag pump device in the first embodiment of this utility model, as shown below. Figure 3 As shown, the pressure tapping assembly 5 may include: a first connector 51, for example, the first end of the first connector 51 has an external thread for threaded connection with the through hole 21; and a conduit 52, the first end of which is connected to the second end of the first connector 51. The first connector 51 is used for a sealing connection with the inner shell 2, allowing the conduit 52 to connect to the first flow channel 22. When sealing the through hole 21 later, the sealing element can be simply screwed into the through hole 21 via the threaded connection, thus achieving efficient sealing of the through hole 21, and the operation is quick and convenient.

[0033] In one feasible implementation, to facilitate the connection between the pipe 52 and the first connector 51, such as Figure 3 As shown, the second end of the first connector 51 can adopt a snap-fit ​​connector structure, and the connection between the first end of the pipe 52 and the second end of the first connector 51 is achieved through a snap-fit ​​connector structure. In this way, the pipe 52 does not need to be rotated during connection and can ensure sealing. In addition, the body of the first connector 51 also does not need to be rotated.

[0034] like Figure 1 As shown, a second flow channel 6 is formed between the inner shell 2 and the outer shell 1, and the inlet 11 is connected to the liquid inlet of the first-stage impeller 3 through the second flow channel 6. A pipe 52 is used to pass through the second flow channel 6. The pipe 52 is isolated and sealed from the second flow channel 6 when connected to the first flow channel 22. Alternatively, the portion of the pressure tapping assembly 5 that penetrates into the outer shell 1 can be located within the second flow channel 6. The inner shell 2 has an end wall at a first preset angle to the axial direction of the bag pump, the end wall being located between the first flow channel 22 and the second flow channel 6, and a through hole 21 is provided on the end wall. The outer shell 1 has a peripheral wall parallel to the axial direction of the bag pump, and a discharge port 13 is provided on the peripheral wall. The first preset angle can be approximately 90 degrees, or other angles, and is not limited thereto in this application. The pressure tapping assembly 5 may include a flexible hose; alternatively, the pipe 52 may be constructed from a flexible hose. Since the fluid in the second flow channel 6 has not yet been pressurized by the impeller, its pressure is relatively low, so there are no particularly high requirements for the laying of the pressure tapping component 5 and the sealing of the discharge port 13.

[0035] like Figure 1 As shown, the outlet 12 of the outer casing 1 is connected to the liquid outlet of the last stage impeller. A third flow channel is formed between the inner casing 2 and the outer casing 1, and the outlet 12 of the outer casing 1 is connected to the liquid outlet of the last stage impeller through the third flow channel. The second flow channel 6 is sealed and separated from the third flow channel.

[0036] In order to obtain the pressure in pipeline 52 and ensure that there is no leakage at the discharge port 13, in a feasible implementation, such as Figure 1 and Figure 2 As shown, the pump assembly or pressure tapping component also includes a flange 7 having a through hole 71, which is connected to the discharge port 13. The flange 7 can be connected to the housing 1 by fasteners such as screws and studs. The through hole 71 is opposite to the discharge port 13, so that the second end of the pipeline 52 is connected to the through hole 71.

[0037] To achieve the connection between the second end of pipe 52 and the through hole 71 of flange 7, as a feasible method, such as Figure 1 and Figure 2As shown, the pressure tapping assembly 5 also includes a second connector 53. The second connector 53 is connected to the second end of the pipeline 52. The second connector 53 can connect to the discharge port 13, allowing the pipeline 52 to connect to the detection device and be isolated and sealed from the second flow channel 6. The detection device can be a pressure detection device. Alternatively, the first end of the second connector 53 has an external thread to be threaded into the through hole 71. That is, the end of the through hole 71 facing the inner shell 2 has an internal thread, thereby threadedly connecting to the first end of the second connector 53. To facilitate the connection between the second connector 53 and the second end of the pipeline 52, the second end of the second connector 53 can be a compression fitting structure, and the second end of the pipeline 52 and the second end of the second connector 53 are connected through the compression fitting structure. In this way, the connection between the second end of the pipeline 52 and the through hole 71 is achieved through the second connector 53. In this way, the pipeline 52 does not need to be rotated during connection, and the sealing is guaranteed. In addition, the body of the second connector 53 also does not need to be rotated.

[0038] Figure 4 This is a schematic diagram of the structure of the pressure tapping component of the bag pump device in the second embodiment of this utility model, as shown below. Figure 4 As shown, in another embodiment, the through hole 21 may be opposite to the discharge port 13. In this case, as feasible, the pressure tapping assembly 5 includes: a rigid tube 54, the first end of which is sealed to the through hole 21. The inner shell 2 has a peripheral wall located between the first flow channel 22 and the second flow channel 6, the through hole 21 is provided on the peripheral wall of the inner shell 2, and the outer shell 1 has a peripheral wall parallel to the axial direction of the bag pump, the discharge port 13 is provided on the peripheral wall of the outer shell 1.

[0039] The pump assembly may further include: a flange 7 having a through hole 71, the flange 7 being connected to the discharge port 13 such that the through hole 71 is opposite to the discharge port 13, and the second end of the pipe body 54 being connected to the through hole 71. The second end of the pipe body 54 may have external threads, and the end of the through hole 71 facing the inner shell 2 has internal threads; the two are connected by threads, which ensures a certain degree of sealing.

[0040] In the above embodiment, for example, the first end of the pipe body 54 can abut against the periphery of the through hole 21 to allow communication between the two. When the flange 7 is connected to the outer shell 1, the flange 7 can exert a force on the pipe body 54 toward the inner shell 2, so that the pipe body 54 is pressed against the inner shell 2, thereby achieving a seal between the pipe body 54 and the through hole 21. To further improve the sealing effect, such as... Figure 4 As shown, a first sealing element 55 is provided between the first end of the tube body 54 and the inner shell 2 around the through hole 21. The sealing element can be annular.

[0041] For example, the tube 54 is inserted into the through hole 21 to make the two connected, and a first sealing element 55 is provided between the outer wall of the tube 54 and the inner wall of the through hole 21.

[0042] In the two implementation methods described above, such as Figure 2 and Figure 4 As shown, a second sealing element 8 can also be provided between the flange 7 and the outer shell 1 to improve the sealing performance between them. Furthermore, in the embodiment where the pressure tapping assembly 5 includes a rigid tube 54, the thickness of the second sealing element 8 is relatively larger, and it has a certain amount of contraction when compressed, thereby ensuring that when the flange 7 is connected to the outer shell 1, the tube 54 presses against the inner shell 2 to ensure the degree of sealing, while ensuring sufficient sealing between the flange 7 itself and the outer shell 1.

[0043] After the pressure tapping assembly 5 taps the fluid pressurized by the first-stage impeller 3, the discharge port 13 can be sealed using a standard flange 7 without a through hole 71.

[0044] This application also proposes a bag pump, which may include: a housing 1 having an inlet 11 for inputting the fluid to be pressurized and a discharge port 13 for discharging residual fluid or impurities; an inner housing 2 disposed within the housing 1, wherein a first-stage impeller 3 and a second-stage impeller 4 located downstream of the first-stage impeller 3 are disposed within the inner housing 2, a through hole 21 is provided on the inner housing 2, and a first flow channel 22 is formed within the inner housing 2 between the liquid outlet of the first-stage impeller 3 and the liquid inlet of the second-stage impeller 4; the inner housing 2 and the housing... A second flow channel 6 is provided between 1 and 2. The inlet 11 is connected to the liquid inlet of the first stage impeller 3 through the second flow channel 6. The through hole 21 connects the first flow channel 22 and the second flow channel 6. The through hole 21 is located near the discharge port 13, so that the external pipeline 52 can enter the second flow channel 6 from the discharge port 13 and connect to the through hole 21, thereby enabling pressure testing of the second flow channel 6. The sealing component seals the through hole 21 so that the bag pump can work normally when tested without the external pressure tapping component.

[0045] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified element, component, part, or step, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps. The use of the term “may” herein is intended to indicate that any described attribute “may” include is optional. Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The disclosure of “a” or “an” used to describe an element, component, part, or step does not imply exclusion of other elements, components, parts, or steps.

[0046] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A bag pump device, characterized in that, The bag pump device includes: A bag pump includes a housing having an inlet for inputting fluid to be pressurized and a discharge port for discharging residual fluid or impurities; an inner shell disposed within the housing, wherein a first-stage impeller and a second-stage impeller located downstream of the first-stage impeller are disposed within the inner shell, a through hole is provided on the inner shell, and a first flow channel is formed within the inner shell between the liquid outlet of the first-stage impeller and the liquid inlet of the second-stage impeller, the through hole communicating with the first flow channel; A pressure tapping assembly is inserted into the housing through the discharge port of the housing and communicates with the through hole to measure the pressure in the first flow channel.

2. The pump device according to claim 1, characterized in that, The through hole is a threaded hole; the pressure tapping component can be threadedly connected to the through hole.

3. The pump device according to claim 1, characterized in that, A second flow channel is formed between the inner shell and the outer shell. The inlet communicates with the liquid inlet of the first stage impeller through the second flow channel. The portion of the pressure tapping assembly that penetrates into the outer shell is located in the second flow channel. The inner shell has an end wall that forms a first preset angle with the axial direction of the bag pump. The end wall is located between the first flow channel and the second flow channel. The through hole is provided on the end wall. The outer shell has a peripheral wall that is parallel to the axial direction of the bag pump. The discharge port is provided on the peripheral wall. The pressure tapping assembly includes a flexible hose.

4. The pump device according to claim 2, characterized in that, The pressure tapping assembly includes: a first connector, the first end of which has an external thread to be threaded into the through hole; A pipeline, the first end of which is connected to the second end of the first connector.

5. The pump device according to claim 4, characterized in that, The pump assembly also includes: A flange with a through hole is connected to the discharge port so that the through hole is opposite to the discharge port, and the second end of the pipeline is connected to the through hole.

6. The pump device according to claim 4, characterized in that, The second end of the first connector is a compression fitting structure, and the connection between the first end of the pipeline and the second end of the first connector is achieved through the compression fitting structure.

7. The pump device according to claim 5, characterized in that, The pressure tapping component further includes: The second connector has an external thread at its first end to allow it to be threadedly connected to the through hole; the second end of the second connector is a compression fitting structure; the second end of the pipeline is connected to the second end of the second connector, thereby enabling the connection between the second end of the pipeline and the through hole to be achieved through the second connector.

8. The pump device according to claim 3, characterized in that, The through hole is opposite to the discharge port, and the pressure tapping assembly includes: A rigid tube body, the first end of which is sealed to the through hole; The inner shell has a peripheral wall located between the first flow channel and the second flow channel, the through hole is provided on the peripheral wall of the inner shell, the outer shell has a peripheral wall parallel to the axial direction of the bag pump, and the discharge port is provided on the peripheral wall of the outer shell. The pump assembly also includes: A flange with a through hole is connected to the discharge port so that the through hole is opposite to the discharge port, and the second end of the pipe body is connected to the through hole.

9. The pump device according to claim 8, characterized in that, The first end of the tube body abuts against the periphery of the through hole to make the two communicate, and a first sealing element is provided between the first end of the tube body and the inner shell around the through hole. or, The tube is inserted into the through hole to connect the two, and a first sealing element is provided between the outer wall of the tube and the inner wall of the through hole.

10. The pump device according to claim 1, characterized in that, The pump device includes: A sealing component that can seal and plug the through hole.

11. A bag pump, characterized in that, The bag pump includes: It has an inlet for inputting the fluid to be pressurized and a discharge port for discharging residual fluid or impurities; An inner shell is disposed within the outer shell. A first-stage impeller and a second-stage impeller located downstream of the first-stage impeller are disposed within the inner shell. A through hole is provided on the inner shell. A first flow channel is formed within the inner shell between the liquid outlet of the first-stage impeller and the liquid inlet of the second-stage impeller. A second flow channel is provided between the inner shell and the outer shell. The inlet communicates with the liquid inlet of the first-stage impeller through the second flow channel, and the through hole connects the first flow channel and the second flow channel. The through hole is located near the discharge port, allowing an external pipeline to enter the second flow channel from the discharge port and connect to the through hole, thereby enabling pressure testing of the second flow channel; A sealing component is provided to seal the through hole so that the bag pump can operate normally when tested without external pressure tapping components.

12. A pressure tapping component, characterized in that, The pressure tapping assembly is used to measure the internal pressure of the bag pump. The bag pump includes an outer shell and an inner shell disposed within the outer shell. A first flow channel is formed within the inner shell, and a through hole communicating with the first flow channel is provided on the inner shell. A second flow channel is provided between the outer shell and the inner shell. A discharge port is provided on the outer shell, and the discharge port communicates with the second flow channel. The pressure tapping assembly can penetrate into the outer shell through the discharge port and can pass through the second flow channel and communicate with the through hole to measure the pressure within the first flow channel.

13. The pressure tapping assembly according to claim 12, characterized in that, The pressure tapping assembly includes a pipe that can pass through the second flow channel, a first connector connected to a first end of the pipe, and a second connector connected to a second end of the pipe. The first connector can be sealed to the inner shell, so that the pipe is connected to the first flow channel and isolated and sealed from the second flow channel. The second connector can be connected to the discharge port, so that the pipe is connected to the detection equipment and isolated and sealed from the second flow channel.

14. The pressure tapping assembly according to claim 13, characterized in that, The first end of the first connector has an external thread to connect to the through hole of the inner shell of the bag pump, and the second end of the first connector is connected to the first end of the pipeline. The pressure tapping assembly includes: a flange with a through hole for connection to the discharge port of the bag pump, and a second end of the pipeline connected to the through hole.

15. The pressure tapping assembly according to claim 14, characterized in that, The second end of the first connector is a compression fitting structure, and the connection between the first end of the pipeline and the second end of the first connector is achieved through the compression fitting structure; The first end of the second connector has an external thread to be threaded into the through hole; the second end of the pipeline is connected to the second end of the second connector; the second end of the second connector is a compression fitting structure, so that the connection between the second end of the pipeline and the second end of the second connector is achieved through the compression fitting structure.

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