Flow and pressure difference testing device for flow and pressure difference structure of household breathing machine

Abstract

The utility model provides a flow and pressure difference testing device for a flow and pressure difference structure of a household breathing machine, which comprises two flow channel bases, one end of each flow channel base is provided with a connector, the other end of each flow channel base is connected with each other in a sealing way, a pressure difference sheet is detachably arranged between the two flow channel bases, and the flow channel bases are connected with the connector. And pressure sampling joints are respectively arranged on the two flow channel bases. According to the utility model, through the detachable mode of the differential pressure sheet and the flow channel bases, the problem that the current household breathing machine is inconvenient or can not carry out multiple times of differential pressure structure flow and differential pressure verification in the breathing machine is solved, the device is simple in structure, and due to the detachable arrangement of the two flow channel bases and the differential pressure sheet, the flow and differential pressure verification can be conveniently carried out. When a flow differential pressure test is verified, the differential pressure piece on the flow channel base is convenient to replace, repeated proofing together with the flow channel is not needed, the differential pressure piece is convenient to disassemble and assemble, and project development cost and human resources are saved to a certain extent.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, and particularly relates to a flow pressure difference test device for a flow pressure difference structure of a household ventilator. Background Technique

[0002] As one of the most important factors of various ventilator products, the appropriate air flow rate can play a good promoting role in the treatment and care of patients during the recovery period. On the contrary, it will cause discomfort, physiological stress, and even have a negative impact on recovery.

[0003] At present, there are generally two methods for measuring gas flow in the field of ventilator products. The first method is the encapsulated external type, which features that the measurement and signal processing and operation are integrated, and it is an independent structure. This method has high measurement accuracy, high cost, and requires a certain assembly space. The second method is the differential pressure internal type, which features that the differential pressure structure is placed in the flow channel (made together with the flow channel or made into a differential pressure piece and clamped in the flow channel), depends on the flow channel structure, and the signal processing and operation part of the flow rate is encapsulated with the circuit board as a whole. This method's measurement accuracy depends on the operation processing structure encapsulated with the circuit board, has low cost, and does not require additional assembly space.

[0004] Currently, household ventilators on the market have certain requirements for cost and assembly space (low cost, small volume, convenient for popularization and household use), so the differential pressure internal type of the second method is adopted.

[0005] The basic principle of the differential pressure internal type is as follows: a certain pressure difference is formed at both ends of the differential pressure structure. The pressure difference has a certain linear relationship with the flow rate. By calibrating a certain correlation algorithm between the pressure difference and the flow rate, the relatively accurate flow rate can be conveniently and quickly measured through the pressure difference at both ends. The magnitude of the generated pressure difference will directly affect the accuracy of the flow rate measurement. If the pressure difference is too small, the resolution will be too low, the error tolerance will be too low, the algorithm processing and operation will be too difficult, and the small flow rate will be measured inaccurately. If the flow pressure difference is too large, a large pressure drop will be formed, and the operating power of the turbine of the household ventilator will increase under the same flow rate, resulting in greater noise. Similarly, the overall machine noise will also increase, causing a bad home care experience for patients. Therefore, designing a differential pressure structure with an appropriate differential pressure plays an important role in improving the flow rate measurement accuracy and the overall performance of the machine.

[0006] Currently, the measurement of the flow differential pressure by the differential pressure structure of household ventilators is carried out integrally in the whole machine. This method requires frequent disassembly and assembly of the whole machine, which is time-consuming and laborious, and has an irreversible damaging effect on the turbine box sealed by self-tapping nuts. Multiple disassembly and assembly operations will damage the threaded fastening positions, which will lead to the direct scrapping of the prototype. Therefore, this method does not support multiple differential pressure structure flow differential pressure tests, and it is impossible to accurately obtain a differential pressure structure with a suitable differential pressure, which has an adverse impact on the flow measurement accuracy and the overall performance of the machine. Moreover, when the flow differential pressure structure is completely integrated with the flow channel, the proofing of different flow differential pressure structures will involve proofing the entire flow channel together, greatly increasing the verification cost.

[0007] Therefore, the existing technology needs to be improved and enhanced. Utility Model Content

[0008] In view of the deficiencies of the above-mentioned existing technology, the present utility model provides a flow differential pressure test device for the flow differential pressure structure of a household ventilator, which solves the problem that it is inconvenient or impossible to conduct multiple differential pressure structure flow differential pressure verifications inside the ventilator for current household ventilators. Moreover, this device has a simple structure, does not require proofing the entire flow channel together multiple times, is convenient for disassembling and assembling the differential pressure piece, and saves the project development cost and human resources to a certain extent.

[0009] In order to achieve the above object, the present utility model adopts the following technical solutions:

[0010] A flow differential pressure test device for the flow differential pressure structure of a household ventilator includes two flow channel bases. One end of each flow channel base is provided with an interface, and the other ends of the two flow channel bases are hermetically connected to each other. A differential pressure piece is detachably installed between the two flow channel bases, and pressure sampling joints are respectively arranged on the two flow channel bases.

[0011] Further, a boss is provided at the other end of the flow channel base. The differential pressure piece is provided with a flow passage and a limiting groove, and the boss is snap-fitted with the limiting groove.

[0012] Further, a recessed portion is provided at the other end of the flow channel base, and the boss is located in the recessed portion.

[0013] Further, fixing holes are provided at the other end of the flow channel base, and the other ends of the two flow channel bases are bolt-connected through the fixing holes.

[0014] Further, a first sealing groove is provided at one end of the flow channel base, and a first sealing ring is arranged in the first sealing groove. One end of the flow channel base is hermetically connected to the interface through the first sealing ring.

[0015] Further, a second sealing ring is arranged in the limiting groove, and the differential pressure piece is hermetically connected to the flow channel base through the second sealing ring.

[0016] Further, sampling holes are provided on the flow channel base, and the pressure sampling connector is threadedly connected to the sampling holes by screws.

[0017] Further, a groove is provided on the flow channel base, the sampling holes are located in the groove, and a third sealing ring is provided in the groove. The pressure sampling connector is hermetically connected to the flow channel base through the third sealing ring.

[0018] Further, the interface is detachably connected to the flow channel base.

[0019] Further, the interface is threadedly connected to the flow channel base by screws.

[0020] Compared with the prior art, the flow differential pressure test device for the flow differential pressure structure of a household ventilator provided by the present utility model includes two flow channel bases. One end of the flow channel base is provided with an interface, the other ends of the two flow channel bases are hermetically connected to each other, a differential pressure plate is detachably installed between the two flow channel bases, and pressure sampling connectors are respectively provided on the two flow channel bases. For the present utility model, by the detachable manner of the differential pressure plate and the flow channel base, the problem that it is inconvenient or impossible to perform multiple flow differential pressure verifications of the differential pressure structure inside the ventilator in the current household ventilator is solved, and the device has a simple structure. Since the two flow channel bases and the differential pressure plate are detachably arranged, when performing the flow differential pressure test verification, it is convenient to replace the differential pressure plate on the flow channel base, without the need to make multiple samples together with the flow channel. The differential pressure plate is convenient to disassemble and install, saving the project development cost and human resources to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0022] Figure 1 It is a schematic structural diagram of the flow differential pressure test device for the flow differential pressure structure of a household ventilator provided by the present utility model.

[0023] Figure 2 It is a cross-sectional schematic diagram of the flow differential pressure test device for the flow differential pressure structure of a household ventilator provided by the present utility model.

[0024] Figure 3 It is a partial assembly schematic diagram of the flow differential pressure test device for the flow differential pressure structure of a household ventilator provided by the present utility model.

[0025] Figure 4 For along Figure 1 The schematic cross-sectional view at position A in

[0026] In the figure: runner base - 1, interface - 2, differential pressure piece - 3, pressure sampling joint - 4, boss - 5, limit groove - 6, flow-through channel - 7, recessed part - 8, fixing hole - 9, first sealing groove - 10, first sealing ring - 11, second sealing ring - 12, sampling hole - 13, groove - 14, third sealing ring - 15. Detailed implementation manners

[0027] For the convenience of understanding the present application, the present application will be described more comprehensively below with reference to the relevant drawings. Embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided so that the disclosure of the present application is more thorough and comprehensive.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the specification of this application herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0029] In the present utility model, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present utility model and its embodiments, and are not used to limit that the indicated device, element or component must have a specific orientation or be constructed and operated in a specific orientation. And, in addition to being able to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present utility model can be understood according to specific circumstances.

[0030] In addition, the terms "first" and "second" used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. When used herein, the singular forms "a", "an" and "the" may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms "comprising" or "having" etc. specify the presence of the stated features, wholes, steps, operations, components, parts or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0031] It should be noted that when an element is referred to as "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0032] In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by this utility model.

[0033] As Figure 1 、 Figure 2 and Figure 3 shown, the flow pressure difference test device for the flow pressure difference structure of a household ventilator provided by this utility model includes two flow channel bases 1. One end of the flow channel base 1 is provided with an interface 2, and the interface 2 is an air inlet or an air outlet. The other ends of the two flow channel bases 1 are hermetically connected to each other, and a pressure difference piece 3 is detachably installed between the two flow channel bases 1. Pressure sampling joints 4 are respectively arranged on the two flow channel bases 1. It can be understood that through the pressure sampling joints 4 on the two flow channel bases 1, the pressure values on both sides of the pressure difference piece 3 can be collected. After ventilation, the calculated pressure difference is the pressure difference at a specified flow rate; then by introducing different flow rates, the pressure differences at different flow rates can be obtained. After being processed by fitting with a certain formula, the flow rate value can be accurately calculated from the flow pressure difference passing through the pressure difference piece 3. Among them, the pressure difference piece 3 is clamped between the two flow channel bases 1, and the pressure difference piece 3 and the flow channel base 1 are in a detachable manner, which can facilitate the multiple disassembly of the pressure difference structure of the pressure difference piece 3 for multiple flow pressure difference verification and tests.

[0034] Compared with the prior art, in the technical solution of the present utility model, by the detachable manner of the differential pressure piece 3 and the flow channel base 1, the problem that the current household ventilator is inconvenient or unable to perform multiple differential pressure structure flow differential pressure verification inside the ventilator is solved, and the device has a simple structure. Since the two flow channel bases 1 and the differential pressure piece 3 are detachably arranged, when performing the flow differential pressure test verification, it is convenient to replace the differential pressure piece 3 on the flow channel base 1, without having to make multiple samples together with the flow channel. The differential pressure piece 3 is convenient to disassemble and assemble, saving the project development cost and human resources to a certain extent.

[0035] In one embodiment, as Figure 2 and Figure 3 shown, a boss 5 is provided at the other end of the flow channel base 1, limiting grooves 6 are provided on both sides of the differential pressure piece 3, and a flow channel 7 for gas to flow through is provided on the differential pressure piece 3. The boss 5 is snap-fitted with the limiting groove 6. It can be understood that through the snap-fit between the boss 5 and the limiting groove 6, the positioning between the differential pressure piece 3 and the flow channel base 1 can be realized.

[0036] Preferably, a recess 8 is provided at the other end of the flow channel base 1, and the boss 5 is located in the recess 8. That is, through the recess 8, the two flow channel bases 1 can wrap the differential pressure piece 3, making the assembly of the differential pressure piece 3 and the two flow channel bases 1 more stable.

[0037] Furthermore, fixing holes 9 are provided at the other end of the flow channel base 1, and the other ends of the two flow channel bases 1 are bolt-connected through the fixing holes 9. It can be understood that after the differential pressure piece 3 and the two flow channel bases 1 are positioned, the two fixing holes 9 are bolt-fixed, and the assembly and fixation between the two flow channel bases 1 and the differential pressure piece 3 can be realized.

[0038] Further, a first sealing groove 10 is provided at one end of the flow channel base 1, and a first sealing ring 11 is arranged in the first sealing groove 10. One end of the flow channel base 1 is hermetically connected to the interface 2 through the first sealing ring 11. The first sealing ring 11 can prevent air leakage between the interface 2 and the flow channel, ensuring the accuracy of measurement.

[0039] Further, a second sealing groove is provided at the other end of the flow channel base 1, and a second sealing ring 12 is arranged in the second sealing groove. The differential pressure piece 3 is hermetically connected to the flow channel base 1 through the second sealing ring 12. The second sealing ring 12 can prevent air leakage between the differential pressure piece 3 and the flow channel base 1, ensuring the accuracy of measurement.

[0040] Preferably, a sampling hole 13 is provided on the flow channel base 1, and the pressure sampling joint 4 is threadedly connected to the sampling hole 13 by a screw. It should be noted that the sampling holes 13 are provided on both sides of the differential pressure piece 3 of the two flow channel bases 1, that is, the pressure sampling joints 4 are provided on both sides of the differential pressure piece 3 for collecting the pressure difference on both sides of the differential pressure piece 3.

[0041] Further, a groove 14 is provided on the flow channel base 1, the sampling hole 13 is located in the groove 14, and a third sealing ring 15 is provided in the groove 14. The pressure sampling joint 4 is hermetically connected to the flow channel base 1 through the third sealing ring 15. It can be understood that the third sealing ring 15 can prevent air leakage between the pressure sampling joint 4 and the flow channel base 1 and ensure the accuracy of measurement.

[0042] Preferably, the interface 2 is detachably connected to the flow channel base 1. The interface 2 is threadedly connected to the flow channel base 1 by a screw. The detachable connection between the interface 2 and the flow channel base 1 facilitates the replacement of different types of joints to adapt to more devices.

[0043] It should be noted that as Figure 4 shown, the differential pressure of the differential pressure piece 3 is directly related to the flow ratio. The flow ratio refers to the ratio of the total area S1 of the flow passage 7 of the differential pressure piece 3 to the cross-sectional area S of the flow passage 7. The smaller the flow ratio, the greater the differential pressure, and the larger the flow ratio, the smaller the differential pressure. Therefore, according to the different flow demand parameters of the home ventilator, the different shapes and areas of the flow channels, a batch of differential pressure pieces 3 with different flow ratios can be selected and designed for experimental verification. Finally, the differential pressure piece 3 with the most suitable flow differential pressure can be obtained. It should be noted that the cross-section of the differential pressure piece 3 and the area and shape of the cross-section of the flow passage 7 of the differential pressure piece 3 can be custom-designed according to the flow channel of the home ventilator.

[0044] Among them, the test method is as follows: Before the test, the equipment is connected. The low-pressure air source (the air outlet end of the home ventilator can be used for air supply) is connected to the interface 2 at one end of the flow differential pressure test device of the present application. One end of the pressure sampling tube is connected to the pressure sampling joint 4 respectively, and the other end of the pressure sampling tube is connected to the pressure monitoring device respectively. After ventilation, the calculated pressure difference is the pressure difference at the specified flow rate. By adjusting the machine to introduce different flow rates, the differential pressure at different flow rates can be obtained. After fitting and processing through a certain formula, the flow rate value can be accurately calculated from the flow differential pressure passing through the differential pressure piece 3.

[0045] In summary, the flow pressure difference test device for the flow pressure difference structure of the household ventilator provided by the present utility model can achieve the positioning between the pressure difference piece and the flow channel base through the engagement between the convex platform and the limiting groove. The recessed part makes the assembly of the pressure difference piece and the two flow channel bases more stable. The first sealing ring can prevent air leakage between the interface and the flow channel. The second sealing ring can prevent air leakage between the pressure difference piece and the flow channel base. The third sealing ring can prevent air leakage between the pressure sampling joint and the flow channel base, ensuring the accuracy of measurement. Compared with the prior art, in the technical solution of the present utility model, by the detachable manner of the pressure difference piece and the flow channel base, the problem that it is inconvenient or impossible to perform multiple flow pressure difference verifications of the pressure difference structure in the ventilator for the current household ventilator is solved. Moreover, the device has a simple structure. Since the pressure difference piece is detachably installed between the two flow channel bases, during the flow pressure difference test verification, it is convenient to replace the pressure difference piece on the flow channel base, without the need to make multiple samples together with the flow channel. The pressure difference piece is convenient to disassemble and assemble, saving the project development cost and human resources to a certain extent.

[0046] The embodiments of the present utility model have been described above in conjunction with the accompanying drawings. However, the present utility model is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present utility model, those of ordinary skill in the art can also make many forms without departing from the purpose of the present utility model and the scope protected by the claims. All of these fall within the protection scope of the present utility model.

Claims

1. A flow rate and pressure difference test device for a flow rate and pressure difference structure of a household ventilator, characterized in that: The invention comprises two flow channel bases (1), one end of each of the flow channel bases (1) is provided with an interface (2), the other ends of the two flow channel bases (1) are sealed and connected to each other, a pressure differential sheet (3) is detachably installed between the two flow channel bases (1), and pressure sampling connectors (4) are respectively provided on the two flow channel bases (1).

2. The flow rate and pressure difference test device for the flow rate and pressure difference structure of a household ventilator according to claim 1, characterized in that: A boss (5) is provided on the other end of the flow channel base (1), and limiting grooves (6) are provided on both sides of the pressure differential plate (3), and the boss (5) is engaged and connected with the limiting grooves (6).

3. The flow rate and pressure difference test device for the flow rate and pressure difference structure of a household ventilator according to claim 2, characterized in that: The other end of the flow channel base (1) is provided with a recessed portion (8), and the boss (5) is located in the recessed portion (8).

4. The flow rate and pressure difference test device for the flow rate and pressure difference structure of a household ventilator according to claim 1, characterized in that: The other end of the flow channel base (1) is provided with a fixing hole (9), and the other ends of the two flow channel bases (1) are bolted together via the fixing hole (9).

5. The flow rate and pressure difference test device for the flow rate and pressure difference structure of a household ventilator according to claim 1, characterized in that: A first sealing groove (10) is provided at one end of the flow channel base (1), a first sealing ring (11) is provided in the first sealing groove (10), and one end of the flow channel base (1) is sealedly connected to the interface (2) via the first sealing ring (11).

6. The flow rate and pressure difference test device for the flow rate and pressure difference structure of a household ventilator according to claim 2, characterized in that: A second sealing ring (12) is provided in the limiting groove (6), and the pressure differential plate (3) is sealedly connected to the flow channel base (1) via the second sealing ring (12).

7. The flow rate and pressure difference test device for the flow rate and pressure difference structure of a household ventilator according to claim 1, characterized in that: The flow channel base (1) is provided with a sampling hole (13), and the pressure sampling joint (4) is threadedly connected to the sampling hole (13) via a screw.

8. The flow rate and pressure difference test device for the flow rate and pressure difference structure of a household ventilator according to claim 7, characterized in that: The flow channel base (1) is provided with a groove (14), the sampling hole (13) is located in the groove (14), and a third sealing ring (15) is provided in the groove (14), and the pressure sampling joint (4) is sealedly connected to the flow channel base (1) via the third sealing ring (15).

9. The flow rate and pressure difference test device for the flow rate and pressure difference structure of a household ventilator according to claim 1, characterized in that: The interface (2) is detachably connected to the flow channel base (1).

10. The flow rate and pressure difference test device for the flow rate and pressure difference structure of a household ventilator according to claim 9, characterized in that: The interface (2) is threadedly connected to the flow channel base (1) via screws.

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