Silent pump for sphygmomanometer

Abstract

The utility model discloses a siren pump for sphygmomanometer, including air pump casing, the first sound absorption layer is arranged in the air pump casing inside, and the air pump casing inside is installed with frequency conversion motor and leather cup, the damping assembly is installed between frequency conversion motor and air pump casing, the leather cup upside is fixed with the air outlet valve piece, and the air outlet valve piece sets up in the air pump cover body inside, the air outlet valve piece and air pump cover body form the buffer cavity between, the air pump cover body inside is provided with second sound absorption layer, and the air pump cover body end portion is installed with the air outlet of gradually expanding type that links together with buffer cavity, the utility model discloses through setting up the first sound absorption layer in the air pump casing inside, and setting up second sound absorption layer in the air pump cover body inside, and the sound absorption layer has absorbed part noise produced in the air pump operation process, has promoted the mute effect.

Description

Technical Field

[0001] This utility model mainly relates to the field of blood pressure monitor technology, specifically a silent pump for a blood pressure monitor. Background Technology

[0002] In the design of electronic blood pressure monitors, the air pump is a key component that drives the inflation and deflation of the blood pressure cuff.

[0003] However, the air pump is noisy during operation. The noise of the air pump mainly comes from the vibration transmission of the motor, the mechanical noise generated by the reciprocating motion of the diaphragm, and the turbulence noise when the air flows through the outlet. This technical problem has long plagued designers and users of blood pressure monitors. In medical settings, the noise of the air pump of an electronic blood pressure monitor may interfere with the stethoscope's capture of Korotkoff sounds. When used at home, the noise can exacerbate the user's anxiety and lead to deviations in blood pressure measurements. Therefore, a silent pump for blood pressure monitors is proposed. Utility Model Content

[0004] This utility model provides a solution that is significantly different from existing technologies, addressing the problem that existing solutions are too simplistic. It mainly provides a silent pump for blood pressure monitors to solve the problem of high noise during operation of blood pressure monitor pumps mentioned in the background.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0006] A silent pump for a blood pressure monitor includes a pump housing, a first sound-absorbing layer on the inner side of the pump housing, a variable frequency motor and a piston cup installed inside the pump housing, a shock-absorbing component installed between the variable frequency motor and the pump housing, an air outlet valve plate fixedly installed on the upper side of the piston cup, and the air outlet valve plate being located inside the pump cover body, forming a buffer cavity between the air outlet valve plate and the pump cover body, a second sound-absorbing layer being provided inside the pump cover body, and a gradually expanding air outlet port connected to the buffer cavity being installed at the end of the pump cover body.

[0007] Preferably, the first sound-absorbing layer is an aluminum fiber sound-absorbing board.

[0008] Preferably, the variable frequency motor is connected to a rotating shaft via an eccentric wheel, and a swing arm is fixed on the upper side of the rotating shaft, the swing arm being fixed to the lower side of the diaphragm.

[0009] Preferably, the air pump cover is fixedly installed at the end of the air pump housing.

[0010] Preferably, the second sound-absorbing layer is made of polyester fiber sound-absorbing cotton.

[0011] Preferably, the vent valve plate is provided with an air hole that connects the vent cup and the buffer chamber.

[0012] Preferably, the air outlet valve plate is equipped with an air guide tube on one side of the buffer chamber, and there is a certain gap between the air outlet and the air guide tube.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] (1) This invention provides a first sound-absorbing layer inside the air pump housing and a second sound-absorbing layer inside the air pump cover. The sound-absorbing layer absorbs some of the noise generated during the operation of the air pump, thus improving the quietness effect.

[0015] (2) The present invention forms a buffer cavity between the air outlet valve plate and the air pump cover. The air outlet has a gradually expanding structure. When the gas enters the buffer cavity from the diaphragm through the air outlet valve plate, the buffer cavity can play a preliminary buffering role on the airflow, reducing the noise generated by the airflow impact. The gradually expanding air outlet can make the airflow speed gradually decrease when it is discharged, further reducing the airflow noise.

[0016] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall front cross-sectional structure of this utility model;

[0018] Figure 2 This is a schematic diagram showing the positional relationship of the first sound-absorbing layer of this utility model;

[0019] Figure 3 This is a schematic diagram of the air outlet valve plate structure of this utility model;

[0020] Figure 4 This is a schematic diagram of the gradually expanding air outlet structure of this utility model;

[0021] Figure 5 This utility model Figure 1 Enlarged structural diagram at point A in the middle.

[0022] Numbering on the map:

[0023] 1. Air pump housing; 2. First sound-absorbing layer; 3. Variable frequency motor; 301. Shock absorption assembly; 302. Eccentric wheel; 303. Swing arm; 4. Leather cup; 5. Air outlet valve plate; 6. Air pump cover; 7. Buffer chamber; 8. Gradually expanding air outlet; 9. Air guide tube. Detailed Implementation

[0024] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, which show several embodiments of the utility model. However, the utility model can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the disclosure of the utility model more thorough and comprehensive.

[0025] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intermediate element present. 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 intermediate element present. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly associated with those skilled in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0027] Please refer to the appendix carefully. Figure 1-5 A silent pump for a blood pressure monitor includes a pump housing 1 containing a variable frequency motor 3 and a diaphragm cup 4. A heat dissipation vent is located at the mounting point of the variable frequency motor 3, with a dustproof mesh installed inside to prevent dust from entering. The variable frequency motor 3 is connected to a rotating shaft via an eccentric wheel 302, and a swing arm 303 is fixed to the upper side of the rotating shaft. The swing arm 303 is fixed to the lower side of the diaphragm cup 4. The eccentric wheel 302 drives the swing arm 303 to swing. A steel ball is also provided at the connection between the eccentric wheel 302 and the rotating shaft. The eccentric wheel 302 and the rotating shaft are movably connected. When the variable frequency motor 3 is running, it drives the eccentric wheel 302 to rotate, which in turn drives the swing arm 303 up and down via the rotating shaft. The swing arm 303 swings, driving the cup 4 to move up and down, thereby achieving air intake and exhaust. A steel ball is set at the connection between the eccentric wheel 302 and the shaft to facilitate the operation of the shaft. The variable frequency motor 3 can adjust the speed according to the working requirements of the blood pressure monitor, thereby accurately controlling the reciprocating frequency and amplitude of the cup 4, avoiding noise peaks caused by continuous high-speed operation. A shock absorption component 301 is installed between the variable frequency motor 3 and the air pump housing 1. The shock absorption component 301 can be a silicone damper, which can effectively absorb the vibration generated by the operation of the variable frequency motor 3, reduce the transmission of vibration to the air pump housing 1, and prevent the air pump housing 1 from generating resonance noise due to vibration.

[0028] The air pump housing 1 has a first sound-absorbing layer 2 inside. The first sound-absorbing layer 2 is an aluminum fiber sound-absorbing board. The aluminum fiber sound-absorbing board is a porous structure formed by interwoven aluminum fibers with a porosity of 70% to 80%. After the sound waves enter, the energy is dissipated through fiber friction and air vibration. It has a significant absorption effect on mid-to-high frequency noise with a sound absorption coefficient of more than 0.8. At the same time, it has a certain resonance absorption effect on low frequency noise. The aluminum material has a high thermal conductivity of about 200W / (m·K). The pores between the fibers allow air convection. Heat can be quickly dissipated through metal conduction and air flow. The heat dissipation efficiency is more than 10 times that of polyester fiber cotton. Therefore, the first sound-absorbing layer 2 has excellent heat dissipation performance while absorbing sound, which is convenient for the subsequent heat dissipation of the variable frequency motor 3.

[0029] An air outlet valve 5 is fixedly installed on the upper side of the cup 4, and the air outlet valve 5 is located inside the air pump cover 6. The air pump cover 6 is fixedly installed at the end of the air pump housing 1. The air pump housing 1 has a single-sided opening structure, and a one-way air inlet is provided on one side of the air pump housing 1 to cooperate with the cup 4.

[0030] The inner side of the air pump cover 6 is provided with a second sound-absorbing layer, which is made of polyester fiber sound-absorbing cotton. The porous structure of the polyester fiber sound-absorbing cotton can effectively absorb the residual mid-to-high frequency noise in the air pump cover 6, such as airflow friction noise and noise transmitted to the cover by component vibration. The polyester fiber material is both lightweight and highly elastic, which can not only fit into the inner wall of the air pump cover 6 to form a complete sound-absorbing surface, but also reduce the secondary noise generated by its own vibration.

[0031] A buffer chamber 7 is formed between the exhaust valve plate 5 and the air pump cover 6. The exhaust valve plate 5 is provided with a one-way air hole that connects the diaphragm cup 4 and the buffer chamber 7. When the diaphragm cup 4 contracts, the gas quickly enters the buffer chamber 7 through the air hole. The space of the chamber reduces the airflow speed and distributes the pressure evenly, avoiding the airflow impact noise caused by instantaneous high pressure. The end of the air pump cover 6 is equipped with a gradually expanding exhaust port 8 that is connected to the buffer chamber 7. An air guide tube 9 is installed on one side of the exhaust valve plate 5 in the buffer chamber 7. There is a certain gap between the gradually expanding exhaust port 8 and the air guide tube 9. The air guide tube 9 can guide the airflow to flow perpendicularly to the exhaust valve plate 5 in a fixed direction to the gradually expanding exhaust port 8, avoiding energy loss and noise caused by disordered diffusion of airflow in the buffer chamber 7. The gradually expanding exhaust port 8 makes the diameter of the exhaust port gradually increase, and the velocity gradient decreases when the airflow passes through. The reduced flow velocity can reduce the loss of gas kinetic energy converted into sound energy, reducing exhaust noise from the source.

[0032] The specific operating procedure of this utility is as follows: After the variable frequency motor 3 starts, it drives the rotating shaft to rotate through the eccentric wheel 302. The eccentric structure of the eccentric wheel 302 causes the rotating shaft to move radially, which in turn drives the swing arm 303 fixed on the upper side of the rotating shaft to swing back and forth. The swing arm 303 is fixedly connected to the lower side of the cup 4. The swing of the swing arm 303 drives the cup 4 to perform regular stretching and contraction movements. When the cup 4 contracts, the internal volume decreases and the air pressure increases. The gas is discharged into the buffer chamber 7 through the air hole on the air outlet valve plate 5. When the cup 4 stretches, the internal volume increases and the air pressure decreases. Air is drawn in through the air inlet, completing the air intake process.

[0033] The high-pressure gas discharged from the leather cup 4 enters the buffer chamber 7 through the air outlet valve plate 5. The chamber space reduces the airflow speed and distributes the pressure evenly, avoiding instantaneous high-pressure impact. The air guide tube 9 on one side of the buffer chamber 7 guides the airflow vertically to the gradually expanding air outlet 8. The gap between the air guide tube 9 and the gradually expanding air outlet 8 allows the airflow to diffuse, further reducing the flow speed and uniform direction.

[0034] The present invention has been described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvement made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, shall be within the protection scope of the present invention.

Claims

1. A silent pump for a blood pressure monitor, comprising a pump housing (1), characterized in that: The air pump housing (1) is provided with a first sound-absorbing layer (2) on the inner side, and a variable frequency motor (3) and a diaphragm cup (4) are installed inside the air pump housing (1). A shock-absorbing component (301) is installed between the variable frequency motor (3) and the air pump housing (1). An air outlet valve plate (5) is fixedly provided on the upper side of the diaphragm cup (4), and the air outlet valve plate (5) is provided inside the air pump cover (6). A buffer cavity (7) is formed between the air outlet valve plate (5) and the air pump cover (6). The air pump cover (6) is provided with a second sound-absorbing layer on the inner side, and a gradually expanding air outlet (8) connected to the buffer cavity (7) is installed at the end of the air pump cover (6).

2. The silent pump for a blood pressure monitor according to claim 1, characterized in that: The first sound-absorbing layer (2) is an aluminum fiber sound-absorbing board.

3. A silent pump for a blood pressure monitor according to claim 1, characterized in that: The variable frequency motor (3) is connected to a rotating shaft via an eccentric wheel (302), and a swing arm (303) is fixed on the upper side of the rotating shaft. The swing arm (303) is fixed to the lower side of the cup (4).

4. A silent pump for a blood pressure monitor according to claim 1, characterized in that: The air pump cover (6) is fixedly installed at the end of the air pump housing (1).

5. A silent pump for a blood pressure monitor according to claim 1, characterized in that: The second sound-absorbing layer is made of polyester fiber sound-absorbing cotton.

6. A silent pump for a blood pressure monitor according to claim 1, characterized in that: The vent valve plate (5) is provided with an air hole that connects the leather cup (4) and the buffer chamber (7).

7. A silent pump for a blood pressure monitor according to claim 1, characterized in that: The air outlet valve plate (5) is located on one side of the buffer chamber (7) and an air guide cylinder (9) is installed thereon. There is a certain gap between the air outlet (8) and the air guide cylinder (9).

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