CN201953601U - A miniature negative pressure pump - Google Patents

Abstract

The utility model discloses a miniature negative pressure pump, which comprises an air flow assembly and a transmission assembly, and the gas guide assembly includes an air nozzle (130), a pressing block (134) and a piston body (136) with at least two piston cavities (135). : the briquetting block (134) is located above the piston chamber (135) and is provided with a vent hole communicating with the corresponding piston chamber (135), wherein a one-way air intake valve (132) is arranged at a part of the vent hole, and a one-way intake valve (132) is arranged at the other part of the vent hole. Air outlet valve (133); a one-way air intake air path is formed by an air nozzle (130), a one-way air intake valve (132), a vent hole and a corresponding piston chamber (135); The air outlet, the one-way air outlet valve (133), and the air outlet (131) communicated with the air outlet on the base (139) form a one-way air outlet air path; Do reciprocating motion in the chamber (135). Because it can form a continuous negative pressure at the gas nozzle, it is suitable for negative pressure wound treatment equipment, etc.

Description

A miniature negative pressure pump

technical field

The utility model relates to a miniature negative pressure pump, or called a miniature vacuum pump, which can form a continuous and stable negative pressure (relative vacuum) at the air nozzle of the air pump, and is especially suitable for medical equipment and electronic instruments such as negative pressure wound treatment equipment.

Background technique

Negative Pressure Wound Therapy Devices, known in the United States as Negative Pressure Wound Therapy Devices, or NPWT devices for short, are designed to promote wound healing by applying negative pressure to the wound. According to the clinical experience in the United States in the past 10 years, the device has a good healing effect on various acute and chronic wounds.

It goes without saying that the negative pressure generating device is a key component of negative pressure wound therapy equipment, and its basic requirement is to provide continuous and stable negative pressure. Because most of the existing negative pressure generating devices are complex in structure, large in volume, inconvenient to carry, and high in price, it is not conducive to popularization and use of negative pressure wound treatment equipment. In order to realize the miniaturization of the negative pressure generating device, the design method of the existing micro air pump can be used for reference, for example:

Diaphragm air pump is a kind of reciprocating piston air pump, which replaces the piston with a diaphragm. Because the diaphragm is generally a flexible material with a small mass, although it also performs reciprocating linear motion, the unbalanced inertial force caused by it is reduced, the vibration and mechanical noise are low, there is no friction and wear between the diaphragm and the pump chamber, and the power consumption is relatively low. Low, can overcome the shortcomings of reciprocating piston air pump noise, wear, power consumption, etc., especially suitable for small medical electronic products such as sphygmomanometers. However, since it does not provide negative pressure, it cannot simply be used in negative pressure wound therapy devices.

The utility model patent titled "a low-power miniature pneumatic pump" and application number "CN200510021763.5" published by the Chinese Patent Office on May 3, 2006 includes gas guide components and transmission components: gas guide components Including air nozzle, pressure block and piston body with more than two piston chambers; transmission assembly includes motor, drive wheel, transmission shaft and piston bracket; one end of the transmission shaft is located in the eccentric spherical surface hole of the piston bracket, and the other end is located in the motor. In the spherical hole of the drive wheel on the output shaft; the compressed gas formed in the piston cavity after the piston body is compressed is output through the one-way gas outlet valve corresponding to the piston cavity on the briquetting block and then connected to the gas nozzle. Compared with other air pressure pumps, the transmission structure of the miniature air avalanche has no internal movement and small friction, which can prevent air backflow and has a simple and reliable structure, thereby effectively improving efficiency and reducing power consumption. However, since the air nozzle of the aforementioned air pump provides compressed air instead of negative pressure, it cannot be applied to negative pressure therapy equipment such as NPWT.

Utility model content

The purpose of the utility model is to improve the structure and air path of the existing air pump equipment, so that it can provide negative pressure at the air nozzle, so that it is suitable for medical electronic equipment such as NPWT.

In order to solve the above technical problems, the technical solution of the utility model is that a micro negative pressure pump includes an air flow assembly and a transmission assembly, and the gas guide assembly includes an air nozzle (130), a briquetting block (134) and at least two Piston body (136) of a piston cavity (135): the briquetting block (134) is located above the piston cavity (135) and is provided with a vent hole communicating with the corresponding piston cavity (135), and a one-way air intake valve is set at a part of the vent hole (132), the other part of the air hole is provided with a one-way air outlet valve (133); a one-way air intake air path is formed by the gas nozzle (130), the one-way air intake valve (132), the air hole and the corresponding piston chamber (135) ;A one-way air outlet circuit is formed by an air outlet arranged on the corresponding piston chamber (135), a one-way air outlet valve (133), and an air outlet (131) communicated with the air outlet on the base (139); the transmission assembly and the gas guide The flow assembly is connected to drive the piston body (136) to reciprocate in the piston cavity (135).

Preferably, the transmission assembly includes a motor (142), a driving wheel (140), a transmission shaft (138) and a piston bracket (137), wherein: the driving wheel (140) is fixed on the motor output shaft; the piston body (136 ) is fixedly supported on the piston bracket (137); one end of the transmission shaft (138) is inserted into the eccentric mounting hole of the driving wheel (140), and the other end is rotatably supported on the rear part of the piston bracket (137) near the center. on the hole.

Preferably, the eccentric mounting hole of the drive wheel (140) is a spherical hole; the mounting hole at the rear of the piston bracket (137) near the center is a spherical hole; the two ends of the transmission shaft (138) are approximately spherical.

Preferably, the inside of the eccentric mounting hole of the drive wheel (140), the mounting hole near the center of the piston bracket (137) and the transmission shaft (138) are coated with lubricating oil.

Preferably, the driving wheel (140) is composed of a running wheel and an eccentric rotor arranged on its upper end surface; the driving wheel (140) is directly pressed into the motor rotor (141).

Preferably, the assembly positioning hole of the piston bracket (137) is mated with the assembly positioning hole of the base (139).

Preferably, the piston bracket (137) is provided with a piston cavity mounting position, wherein the piston body mounting position is placed.

Preferably, the bottom of the piston body (136) is provided with an elastic fixing sleeve; each piston body (136) is in sealing connection with the corresponding elastic fixing sleeve.

Preferably, the elastic fixing sleeve is located at the intersection of the bottom surface of the piston cavity (135) and the surrounding sides of the piston cavity (135), and can extend downwards and rearward along the surrounding sides of the piston cavity (135).

Preferably, piston chamber sealing rings are provided around the plurality of piston chambers (135) of the piston body (136).

Compared with the prior art, on the basis of the existing miniature air pressure pump, the utility model provides a miniature negative pressure pump, which can provide negative pressure at the air nozzle, and has the advantages of simple air path, good air tightness, The assembly process is simple, stable and reliable, low power consumption and other advantages.

Description of drawings

Fig. 1 is the structural representation of the miniature negative pressure pump of the present utility model.

In Fig. 1, relevant reference signs are as follows:

130—gas nozzle;

131 - air outlet;

132—one-way intake valve;

133—one-way outlet valve;

134——briquetting;

135——piston cavity;

136 - piston body;

137—piston bracket;

138——drive shaft;

139 - base;

140——drive wheel;

141——motor rotor;

142 - Motor.

Detailed ways

In order to further understand the basic principle and structure of the utility model, the utility model will be described below in conjunction with the accompanying drawings and embodiments.

Referring to Fig. 1, the miniature negative pressure pump of the present invention is mainly composed of a gas guide assembly and a transmission assembly, wherein:

The gas guide assembly includes a gas nozzle 130, a briquetting block 134 and a piston body 136 with two or more piston cavities 135; vent holes are arranged on the briquetting blocks 134 corresponding to each piston cavity 135, and a single valve is fixed on them. To the outlet valve 133, and these vent holes communicate with the piston cavity 135. The one-way air intake path is formed by the air nozzle 130, the one-way air intake valve 132, the air hole, and the corresponding piston chamber 135; The air outlet hole 131 connected with the air hole constitutes a one-way air outlet air path.

The drive assembly includes a motor 142 , a drive wheel 140 , a metal drive shaft 138 and a piston bracket 137 . The bottom of each piston body 136 is provided with an elastic fixing sleeve, and the piston body 136 is in sealing connection with the corresponding elastic fixing sleeve. The driving wheel 140 is fixed on the motor output shaft, and the piston body 136 is fixedly supported on the piston bracket 137. On the corresponding hole position of the drive wheel 140, the other end of the transmission shaft 138 is rotatably supported on the rear portion of the piston bracket 137 near the center.

Furthermore, the aforementioned elastic fixing sleeve is located at the junction of the bottom surface of each piston cavity 135 and the surrounding sides of the piston cavity 135 , and can extend downwards and rearward along the surrounding sides.

As shown in Figure 1, the drive wheel 140 in the utility model is composed of a runner and an eccentric spherical hole arranged on it, and a spherical hole is provided at the rear of the piston bracket 137 near the center; Both ends of the metal transmission shaft 138 are basically spherical, one end is located in the eccentric spherical hole of the piston bracket 137 , and the other end is located in the spherical hole of the driving wheel 140 . And, the inside of the eccentric spherical surface hole of the driving wheel 140 and the eccentric spherical surface hole of the piston body bracket 137 and the metal transmission shaft 138 are coated with lubricating oil.

The assembly process of the utility model is very simple, as follows:

The transmission assembly includes components such as a motor 142, a base 139, motor fixing screws, a drive wheel 140, a transmission shaft 138, and a piston bracket 137, wherein: the bottom of the motor 142 has motor terminals; stomata. During assembly, the base 139 is fastened with the screw holes on the motor 142 by two fixing screws with spring washers; the driving wheel 140 is composed of a runner and an eccentric rotor arranged on its upper end surface, and the driving wheel 140 directly press into the motor output shaft; a spherical hole is provided at the center of the rear part of the piston bracket 137, and the piston bracket 137 is connected with the assembly positioning hole of the base 139 by using the assembly positioning hole; Connect the piston bracket 137 and the driving wheel 140, wherein the spherical surface at one end of the transmission shaft 138 is arbitrarily inserted into the spherical surface guide hole on the end surface of the driving wheel 140, specifically the spherical surface hole at the other end of the transmission shaft 138 is naturally placed in the piston bracket 137 In the spherical surface hole; finally the spherical surface hole on the piston bracket 137 and the eccentric spherical surface hole above the drive wheel 140 are coated with lubricating oil; so far, the transmission assembly is installed.

The gas diversion assembly is made up of fixing screw, gas nozzle 130, one-way inlet valve 132, one-way outlet valve 133, pressing block 134, piston body 136, etc., wherein: a plurality of one-way inlet valves 132 are installed on the pressing plate On the corresponding one-way intake valve fixing hole; the piston body 136 is passed through the piston chamber mounting position on the piston bracket 137, and put into the piston body mounting position; each piston chamber 135 bottom is provided with elastic fixing sleeves, which are located on each piston The bottom of the cavity 135 meets the surrounding sides of the piston cavity 135 and can extend downward along the surrounding sides. The air outlet channel leads to the air exchange chamber. There is a fixed one-way air outlet valve 133 at the air outlet hole 131 . The one-way air outlet valve 133 cooperates with the air outlet hole 131 . The fixed sleeve of the piston body 136 is inserted into the installation position of the piston body 136. Since the fixed sleeve of the piston body 136 is made of silicon rubber, it can be tightly matched with the upper piston body 136 after being inserted, thereby increasing the thickness of the piston body 136. The tightness of a piston cavity and a plurality of one-way intake valves 132. Piston chamber sealing rings are provided around the multiple piston chambers of the piston body 136 , which can effectively increase the airtightness between the pressing block 134 and the piston chamber 135 .

Finally, fix the gas guide assembly and the transmission assembly with fixing screws, and thus complete the installation of the miniature negative pressure pump.

The specific working principle of the micro negative pressure pump is as follows:

After voltage is applied to the motor 142 of the transmission assembly, the motor rotor 141 starts to rotate, and the drive wheel 140 connected to the output shaft of the motor rotates together with the output shaft of the motor. The driving wheel 140 is provided with an eccentric hole, and the side of the eccentric hole is provided with a spherical surface installation guide hole, and the transmission shaft 138 is pressed into the piston support spherical surface installation guide hole to connect them. Therefore, when the driving wheel 140 rotates together with the output shaft of the motor, the driving wheel 140 will drive the piston body 136 to perform a circular swinging motion with the spherical hole at the bottom of the piston bracket 137 as the center of the circle. Simultaneously, when the metal transmission shaft 138 performs circular swing motion, it also drives the piston body 136 to reciprocate in the piston chamber 135 through the connecting rod.

When the piston body 136 stretches the piston chamber 135, the air pressure in the piston chamber 135 is relatively small, and the external air pressure is relatively large. The one-way air intake valve 132 connected to the air path at the air nozzle 130 is flushed open, and the one-way air outlet valve 133 is closed. ; When the piston body 136 compresses the piston chamber 135, the air pressure in the piston chamber 135 increases, so that the one-way inlet valve 132 is closed, and the one-way outlet valve 133 is flushed open. During the reciprocating movement of the piston body 136 in the piston cavity 135 , the air at the air nozzle 130 passes through the piston cavity 135 and is discharged from the air outlet 131 to form a negative pressure. Since the piston body 136 includes more than two piston chambers 135, one piston chamber 135 may discharge gas during the process of inhaling gas from the other piston chamber 135, thereby ensuring continuous and stable negative pressure at the gas nozzle 130.

The above miniature negative pressure pump can provide continuous and stable negative pressure at the gas nozzle 130, and has the advantages of simple gas circuit, good air tightness, simple assembly process, stability and reliability, and low power consumption, and is especially suitable for NPWT equipment.

The above are only preferred implementations of the present utility model. It should be pointed out that the above-mentioned preferred implementations should not be regarded as limitations on the present utility model, and the protection scope of the present utility model should be based on the scope defined by the claims. For those skilled in the art, without departing from the spirit and scope of the utility model, some improvements and modifications can also be made, and these improvements and modifications should also be regarded as the protection scope of the utility model.

Claims (10)

1. A miniature negative pressure pump, comprising an air flow assembly and a transmission assembly, characterized in that the gas guide assembly includes an air nozzle (130), a briquetting block (134) and a piston with at least two piston cavities (135) Body (136): The briquetting block (134) is located above the piston chamber (135) and is provided with vent holes communicating with the corresponding piston chamber (135). One-way air intake valves (132) are provided at some of the vent holes, and the other part of the vent holes A one-way air outlet valve (133) is arranged at the place; a one-way air intake air path is formed by an air nozzle (130), a one-way air intake valve (132), a vent hole and a corresponding piston chamber (135); 135) on the air vent, the one-way air outlet valve (133), and the air outlet (131) communicated with the air vent on the base (139) to form a one-way air outlet air path; the transmission assembly is connected with the gas guide assembly to drive the piston body ( 136) reciprocate in the piston cavity (135). 2. The miniature negative pressure pump according to claim 1, wherein the transmission assembly comprises a motor (142), a drive wheel (140), a drive shaft (138) and a piston bracket (137), wherein: the drive wheel (140) is fixed on the motor output shaft; the piston body (136) is fixedly supported on the piston bracket (137); one end of the drive shaft (138) is inserted into the eccentric mounting hole of the drive wheel (140), and the other end is rotatably supported On the mounting hole near the center at the rear of the piston bracket (137). 3. The miniature negative pressure pump as claimed in claim 2, characterized in that, the eccentric mounting hole of the drive wheel (140) is a spherical hole; the mounting hole at the rear of the piston support (137) near the center is a spherical hole; Both ends of the shaft (138) are approximately spherical. 4. The miniature negative pressure pump according to claim 3, characterized in that, the eccentric mounting hole of the drive wheel (140), the mounting hole at the rear of the piston bracket (137) near the center, and the drive shaft (138) cooperate with the inner side Coated with lubricating oil. 5. miniature negative pressure pump as claimed in claim 2, is characterized in that, driving wheel (140) is made up of a running wheel and the eccentric rotor that is arranged on its upper end face; This driving wheel (140) is directly pressed into motor rotor ( 141) on. 6. The miniature negative pressure pump according to claim 2, characterized in that, the assembly positioning hole of the piston bracket (137) is mated with the assembly positioning hole of the base (139). the 7. The miniature negative pressure pump according to claim 2, characterized in that, the piston bracket (137) is provided with a piston cavity mounting position, wherein the piston body mounting position is placed. 8. The miniature negative pressure pump according to claim 1, characterized in that, the bottom of the piston body (136) is provided with an elastic fixing sleeve; each piston body (136) is in sealing connection with the corresponding elastic fixing sleeve. 9. The miniature negative pressure pump according to claim 8, characterized in that the elastic fixing sleeve is located at the intersection of the bottom surface of the piston cavity (135) and the surrounding sides of the piston cavity (135), and can be moved along the surrounding sides of the piston cavity (135). Extend down and back. 10. The miniature negative pressure pump according to claim 1, characterized in that, a plurality of piston chambers (135) of the piston body (136) are provided with sealing rings around the piston chambers. the

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