An air pump

Abstract

This utility model belongs to the technical field of decontamination devices, and provides an air pump. The air pump includes: a piston cylinder having a piston chamber with a pumping port; a piston disposed in the piston chamber with an inlet port, the inlet port and the pumping port communicating through the piston chamber; an inlet check assembly disposed at the head of the piston and facing away from the piston rod; when a gap is formed between the inlet check assembly and the inlet port, it is suitable for enabling communication between the outside and the piston chamber and for injecting air into the piston chamber; a drive device connected to the piston, suitable for telescopic movement along the extension direction of the piston chamber; and a pressure holding device disposed at the outlet end of the piston cylinder, for communicating with an air storage chamber, suitable for sealing the pumping port when the pressure at the inlet end of the air storage chamber reaches a predetermined pressure value. This utility model ensures stable air supply pressure through the pressure holding device and seals the pumping port when the pressure at the inlet end of the decontamination device is not lower than the set pressure, thereby achieving intermittent air supply.

Description

Technical Field

[0001] This utility model relates to the field of automotive cleaning devices, and in particular to an air pump. Background Technology

[0002] Certain special-function parts on automobiles often require cleaning. Gas, as one of the many cleaning media, has advantages such as being easy to obtain and not corroding or damaging the parts to be cleaned. However, when using gas as a cleaning medium, it is usually necessary to use an air pump to pressurize the gas from normal pressure to a certain pressure before spraying it onto the surface of the parts to be cleaned. The high-pressure gas then impacts the dirt on the surface of the parts to achieve cleaning.

[0003] In the existing technology, the air outlet of the air pump is directly connected to the spray structure of the decontamination device. During decontamination, the air pump needs to continuously supply gas from the air source to the decontamination device, which is then further pressurized by the gas storage and pressurization structure inside the decontamination device. Alternatively, the decontamination device may not have a gas storage and pressurization structure. This results in the gas pressure output by the decontamination device being unstable and difficult to control, affecting the decontamination effect of the device. At the same time, the air pump's drive device (such as a motor) needs to work continuously, resulting in significant energy consumption.

[0004] In view of this, there is an urgent need for an air pump to achieve discontinuous air supply to the car cleaning device, so as to achieve constant pressure supply and intermittent supply of gas. Utility Model Content

[0005] To address the technical problems existing in the prior art, the purpose of this utility model is to provide an air pump for constant pressure output and discontinuous pumping of gas to a decontamination device.

[0006] To achieve the above-mentioned utility model objectives, this utility model provides an air pump, the air pump comprising:

[0007] A piston cylinder having a piston chamber having a pumping port;

[0008] A piston is disposed in the piston chamber, and the sealing end of the piston has an air inlet, which is connected to the pumping port through the piston chamber.

[0009] An intake check valve is disposed at the head of the piston and on the side end face of the piston rod facing away from the piston.

[0010] A driving device, connected to the piston, adapted to perform telescopic movement along the extension direction of the piston chamber; and

[0011] A pressure-holding device is provided at the outlet end of the piston cylinder. The pressure-holding device is used to communicate with the air storage chamber and is adapted to block the pump air hole when the pressure at the inlet end of the air storage chamber reaches a predetermined value.

[0012] In one technical solution of this utility model, when the air intake check piece is disposed in contact with the side end face of the piston, it is suitable for blocking the air intake hole; when a gap is formed between the air intake check piece and the air intake hole, it is suitable for enabling communication between the external space and the piston cavity and for injecting air into the piston cavity.

[0013] In one technical solution of this utility model, the pressure-holding device includes:

[0014] The pressure-holding housing has an open end that, together with the side end face of the piston cylinder, forms a pressure-holding cavity; the pressure-holding housing has an air outlet structure that communicates with the pressure-holding cavity;

[0015] A sealing check assembly is disposed within the pressure holding chamber, and the sealing check assembly is adapted to block the pump air hole when the pressure within the pressure holding chamber is not lower than a set pressure.

[0016] In one technical solution of this utility model, the pressure-holding outer shell is detachably connected to the piston cylinder.

[0017] In one technical solution of this utility model, the sealing check assembly includes:

[0018] A sealing element is disposed within the pressure-holding cavity, and the sealing element abuts against the pump air hole; the area of ​​the sealing element is not less than the area of ​​the pump air hole;

[0019] An elastic element has one end abutting against the end of the sealing element away from the pumping port, and the other end is adapted to press the sealing element tightly against the pumping port.

[0020] In one technical solution of this utility model, the sealing component is a flexible component or a rigid component.

[0021] In one technical solution of this utility model, the piston includes:

[0022] A piston body, the outer contour of which is adapted to the inner peripheral wall of the piston cavity; the air inlet hole penetrates the wall thickness of the piston body; and

[0023] The piston rod is disposed at the end of the piston body away from the pressure-holding device; the end of the piston rod away from the piston body is connected to the driving device.

[0024] In one technical solution of this utility model, the piston rod is provided with a weight reduction structure.

[0025] In one technical solution of this utility model, the distance d1 from the geometric center of the air inlet to the central axis of the piston body and the distance d2 from the geometric center of the air inlet to the outer contour surface of the piston body satisfy: d1 < d2.

[0026] In one technical solution of this utility model, the piston body is provided with a flexible sealing element, the outer contour of which is adapted to the inner peripheral wall of the piston cavity to seal the piston cavity.

[0027] In one technical solution of this utility model, the air intake check component includes a fixed end and an elastic check end. The fixed end is used to fix it to the side end face of the piston. When air is injected, the elastic check end bends away from the air intake hole. After the air is injected, the elastic check end blocks the air intake hole again.

[0028] Compared with the prior art, this utility model has the following advantages:

[0029] This invention proposes an air pump that uses a pressure-holding device at the front end of a piston cylinder. This device is connected to a cleaning device and is designed to seal the pump orifice when the pressure within the pump is not lower than a set pressure, thus ensuring a stable supply of gas pressure. Simultaneously, the air inlet on the piston is connected to the pump orifice through a piston chamber. An air inlet check valve is positioned at the piston head, facing the air inlet. The piston's movement temporarily stores and pressurizes the gas entering the piston chamber through the air inlet before outputting it to the pressure-holding device through the pump orifice. This allows for flexible motor control based on the cleaning device's requirements, enabling discontinuous pumping. When the inlet pressure of the cleaning device is detected to be constant, the motor in the air pump can briefly pause; when the inlet pressure of the cleaning device falls below a constant preset pressure, the motor can restart. This effectively reduces the motor's energy consumption compared to continuous operation. Attached Figure Description

[0030] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0031] Figure 1 A schematic view of the air pump provided in the embodiment of this utility model;

[0032] Figure 2 The schematic diagram shows a front view of the air pump provided according to an embodiment of the present invention;

[0033] Figure 3 illustrative representation Figure 2 A schematic diagram of the cross-sectional structure of the air pump at point AA;

[0034] Figure 4 This schematic diagram illustrates the connection structure between the piston and the drive device according to an embodiment of the present invention.

[0035] Figure 5 This schematic diagram illustrates the connection structure of the piston and the drive device at another angle according to an embodiment of the present invention.

[0036] Figure 6 The schematic diagram illustrates the structure of the pressure-holding device provided in the embodiments of this utility model.

[0037] The correspondence between component names and reference numerals in the accompanying drawings is as follows:

[0038] 1. Piston cylinder; 2. Piston; 3. Inlet check valve; 4. Drive unit; 5. Pressure holding device;

[0039] 11. Piston chamber; 12. Pump air port;

[0040] 21. Piston body; 22. Piston rod;

[0041] 211. Air inlet; 212. Flexible seal;

[0042] 221. Weight reduction structure; 222. Piston rod fixing part;

[0043] 31. Check valve fixing part; 32. Check valve bending part;

[0044] 41. Eccentric wheel; 42. Motor; 43. Fixed shaft;

[0045] 411. Cam; 412. Pivot shaft; 413. Circumferential locating hole; 414. Radial locating hole;

[0046] 51. Pressure-holding housing; 52. Sealing check valve assembly; 53. Venting structure;

[0047] 521. Sealing component; 522. Elastic component. Detailed Implementation

[0048] The description of the embodiments in this specification should be taken in conjunction with the accompanying drawings, which should form part of the complete specification. In the drawings, the shape or thickness of the embodiments may be exaggerated and may be indicated in a simplified or convenient manner. Furthermore, parts of the various structures in the drawings will be described separately; it is worth noting that elements not shown in the figures or not described in words are in a form known to those skilled in the art.

[0049] The description of the embodiments herein, including any references to direction and orientation, is for ease of description only and should not be construed as limiting the scope of protection of this utility model. The following description of preferred embodiments involves combinations of features, which may exist independently or in combination; this utility model is not particularly limited to the preferred embodiments. The scope of this utility model is defined by the claims.

[0050] like Figures 1 to 6 As shown, this utility model provides an air pump for intermittently pumping gas in an automotive cleaning device, comprising: a piston cylinder 1, a piston 2, an air inlet check valve 3, a drive device 4, and a pressure holding device 5. The piston cylinder 1 has a piston chamber 11, which has a pumping port 12. The piston 2 is disposed within the piston chamber 11 and is adapted to extend and retract along the extension direction of the piston chamber 11. An air inlet 211 is provided on the sealing end of the piston 2, and the air inlet 211 communicates with the pumping port 12 through the piston chamber 11. The air inlet check valve 3 is disposed at the head of the piston 2 and faces away from the piston rod side face. When the air inlet check valve 3 is disposed against the side face of the piston 2, it is adapted to block the air inlet 211. When a gap is formed between the air inlet check valve 3 and the air inlet 211, it is adapted to allow communication between the external space and the piston chamber 11 and to inject air into the piston chamber 11. The drive device 4 is connected to the piston 2 and is adapted to cause the piston 2 to extend and retract along the extension direction of the piston chamber 11. The pressure-holding device 5 is located at the outlet end of the piston cylinder 1. The pressure-holding device 5 is connected to the air storage chamber and is suitable for sealing the pump air hole 12 when the pressure at the inlet end of the air storage chamber reaches a predetermined pressure value. This invention can achieve the sealing of the pump air hole when the pressure at the inlet end of the decontamination device is stable, and the activation of the piston 2 of the air pump when the pressure at the inlet end of the decontamination device decreases, supplying air to the decontamination device through the pressure-holding device 5. This ensures stable air supply pressure while achieving intermittent air supply from the air pump, avoiding increased energy consumption due to continuous operation of the air pump.

[0051] In some embodiments of this utility model, the driving device 4 includes an eccentric wheel 41 and a motor 42 fixedly connected to the eccentric wheel 41. The output end of the eccentric wheel 41 is hinged to the piston rod 22 of the piston 2. The motor output shaft of the motor 42 is circumferentially fixedly connected to the pivot shaft of the eccentric wheel 41, and is used to drive the eccentric wheel 41 to rotate coaxially with the motor output shaft.

[0052] In some embodiments of this utility model, the pressure-holding device 5 includes a pressure-holding housing 51 and a sealing check assembly 52. ​​The open end of the pressure-holding housing 51 and the side end face of the piston cylinder 1 together form a pressure-holding cavity. The pumping port 12 and the sealing check assembly 52 are disposed inside the pressure-holding cavity. The sealing check assembly 52 is used to seal the pumping port 12 to achieve air inlet check of the pressure-holding cavity. The pressure-holding housing 51 has an outlet structure 53 communicating with the pressure-holding cavity. The diameter of the pumping port 12 is larger than the diameter of the inlet port 211, so that the air pump pressurizes the gas entering the piston cavity 11. The outlet diameter of the outlet structure 53 is smaller than the diameter of the pumping port 12, so that the high-pressure gas can flow out quickly from the piston cavity 11 to the pressure-holding cavity.

[0053] In some embodiments of this utility model, the sealing check assembly 52 includes a plugging member 521 and an elastic member 522. The plugging member 521 is disposed in the pressure-holding chamber and abuts against the air pumping port 12. The area of ​​the plugging member 521 is not less than the area of ​​the air pumping port 12, which is used to improve the sealing performance of the plugging member 521 against the air pumping port 12. One end of the elastic member 522 abuts against the end of the plugging member 521 away from the air pumping port 12, and the other end of the elastic member 522 is adapted to press the plugging member 521 tightly against the air pumping port 12. The plugging member 521 and the elastic member 522 can be integrally formed or separately designed and manufactured.

[0054] In some embodiments of this utility model, the elastic element 522 is a spring. One end of the spring abuts against the end face of the sealing element 521 away from the pumping port 12, and the other end abuts against the inner wall of the pressure-holding shell 51. The elastic element 522 can be a cylindrical spring or a conical spring. When the elastic element 522 is a conical spring, the stability of the elastic element 522 in the pressure-holding cavity can be improved.

[0055] In some embodiments of this utility model, the pressure-holding housing 51 and the piston cylinder 1 are detachably connected, allowing the pressure-holding housing 51 and the piston cylinder 1 to be manufactured separately and then assembled. This improves the manufacturing efficiency of the components, reduces the manufacturing difficulty of the piston cylinder 1 and the pressure-holding housing 51, and also facilitates the replacement and maintenance of the sealing check assembly 52 in the pressure-holding chamber, thereby extending the service life of the air pump. Specifically, the pressure-holding housing 51 may be provided with a connecting lug having a bolt through hole, and the piston cylinder 1 may be provided with a bolt hole adapted to the bolt through hole. After the bolt passes through the bolt through hole, it is fixed to the bolt hole on the piston cylinder 1, realizing a detachable connection between the pressure-holding cover and the piston cylinder 1.

[0056] In some embodiments of this utility model, the piston 2 includes a piston body 21 and a piston rod 22. The outer contour of the piston body 21 is adapted to the inner peripheral wall of the piston cavity 11; the air inlet 211 penetrates through the wall thickness of the piston body 21. The piston rod 22 is disposed at the end of the piston body 21 away from the pressure holding device 5; the end of the piston rod 22 away from the piston body 21 is hinged to the eccentric wheel 41.

[0057] In some embodiments of this utility model, the sealing member 521 is a flexible member or a rigid member. When the sealing member 521 is a flexible member, the sealing member 521 and the rigid piston cylinder 1 form a sealing form that combines rigidity and flexibility. This can improve the sealing of the sealing protrusion by the sealing member 521 under higher air pressure, thereby achieving the effect of better sealing under higher pressure.

[0058] In some embodiments of this utility model, the distance d1 from the geometric center of the air inlet 211 to the central axis of the piston body 21 and the distance d2 from the geometric center of the air inlet 211 to the outer contour surface of the piston body 21 satisfy: d1 < d2. This makes the air inlet 211 eccentrically set on the piston body 21, which can avoid turbulence near the air inlet 211, thereby avoiding resonance of the piston cylinder 1, and thus reducing the noise and heat generation of the piston cylinder 1 during piston movement.

[0059] In some embodiments of this utility model, the piston rod 22 is provided with a weight-reducing structure 221. Preferably, the weight-reducing structure 221 can be a recess provided on the piston rod 22. There can be multiple recesses arranged at intervals along the extension direction of the piston rod 22. The shape of the recess can be triangular, circular, square, etc. Preferably, in some embodiments of this utility model, the weight-reducing structure 221 is a triangular groove, and the sides of two adjacent triangular grooves are arranged parallel to form a stiffening rib, thereby reducing the weight of the piston rod 22 while ensuring the structural strength of the piston rod 22.

[0060] In some embodiments of this utility model, the eccentric wheel 41 includes a cam 411 and a pivot shaft 412 integrally formed with the cam 411. A piston rod fixing portion 222 is provided at the end of the piston rod 22 furthest from the piston body 21. The cam 411 and the piston rod fixing portion 222 are provided with a first fixing shaft hole and a second fixing shaft hole. A fixing shaft 43 passes through the first fixing shaft hole and the second fixing shaft hole and is connected to the cam 411 and the piston rod fixing portion 222 by an axial limiting member. The pivot shaft 412 can be fan-shaped, and the radius of the pivot shaft 412 is larger than the radius of the cam 411 to improve the load-bearing capacity of the pivot shaft 412.

[0061] In some embodiments of this utility model, the pivot shaft 412 is provided with a circumferential positioning hole 413 adapted to the motor output shaft. The outer circumferential surface of the motor output shaft has at least one limiting plane, and the outer circumferential surface of the pivot shaft 412 is provided with a radial positioning hole 414 arranged radially along the pivot shaft 412. The radial positioning hole 414 communicates with the circumferential positioning hole 413, and the central axis of the radial positioning hole 414 is parallel to the plane containing the piston rod 22. The drive device 4 also includes a radial positioning element, disposed within the radial positioning hole 414 and abutting against the limiting plane, for axially fixing the pivot shaft 412 on the motor output shaft. The axial positioning element can be a set screw, and the axial positioning hole 414 can be a threaded hole. By setting a limiting plane on the motor output shaft, the cross-section of the motor output shaft is made into a D-shape. The circumferential positioning hole 413, which matches the upper limiting plane of the motor output shaft, is used to circumferentially position the motor output shaft and the pivot shaft 412, preventing the pivot shaft 412 from rotating circumferentially relative to the motor output shaft. By screwing a set screw into the radial positioning hole 414 and abutting against the limiting plane, the axial positioning of the motor output shaft and the pivot shaft 412 is achieved, preventing the eccentric wheel 41 from moving axially relative to the motor output shaft, thereby improving the stability of the air pump operation.

[0062] In some embodiments of this utility model, the intake check valve 3 includes a fixed end 31 and an elastic check end 32. The fixed end 31 is used to fix and connect to the side end face of the piston body 21. During air injection, the elastic check end 32 bends away from the air inlet 211. After air injection, the elastic check end 32 blocks the air inlet 211 again. The intake check valve 3 can be a sheet structure made of elastic material. Preferably, the intake check valve 3 can be an elastic steel sheet, which has the advantages of simple structure and convenient manufacturing.

[0063] In some embodiments of this utility model, a flexible sealing element 212 is provided on the piston body 21. The outer contour of the flexible sealing element 212 is adapted to the inner wall contour of the piston cavity 11 to seal the piston cavity 11 and further improve the air pump's sealing performance.

[0064] In this invention, the motor 42 is started, and the motor output shaft rotates, driving the eccentric wheel 41 to rotate synchronously. The eccentric wheel 41 drives the piston rod 22 to move along the extension direction of the piston cavity 11 within the piston cylinder 1, realizing the extension and retraction of the piston 2. When the piston rod 22 drives the piston 2 to pull outward relative to the piston cylinder 1, gas from the external space is injected into the piston cavity 11 through the air inlet 211. The gas with a certain pressure pushes the elastic check end 32 of the air inlet check member 3 to undergo elastic deformation, causing the elastic check end 32 to bend away from the air inlet 211, forming a gap between the elastic check end 32 and the air inlet 211 to allow gas to enter. When the piston rod 22 drives the piston cylinder 1 to push inward, the gas is transported to the pressure holding chamber through the pumping port 12 of the piston cylinder 1. The gas entering the pressure-holding chamber overcomes the elastic force of the elastic element 522 on the sealing element 521 and pushes open the sealing element 521, allowing the gas to enter the pressure-holding chamber. Finally, the gas is transported to the gas storage structure of the decontamination device that is sealed to it through the gas outlet structure on the pressure-holding outer shell 51.

[0065] It should be noted that when the pressure in the gas storage structure of the decontamination device is constant, the sealing component 521 will seal the pumping port 12 of the piston cylinder 1 under the action of the elastic force of the elastic component 522, so as to achieve the purpose of maintaining pressure and making the pressure in the gas storage structure of the decontamination device constant.

[0066] Furthermore, the motor 42 in this invention can stop operating when the pressure inside the air storage structure of the decontamination device reaches a constant value. When the pressure inside the air storage structure of the decontamination device falls below a preset pressure value, the motor 42 restarts to inject air into the air storage structure of the decontamination device again via the air pump in this invention, until the pressure inside the air storage structure of the decontamination device reaches the preset pressure value and remains at a constant pressure value, after which the motor 42 stops operating. It is evident that since the motor 42 in the air pump does not need to operate continuously, the air pump also has an energy-saving effect.

[0067] Finally, it should be noted that the above description represents the preferred embodiment of this utility model. It should be pointed out that although the preferred embodiment of this utility model has been described, those skilled in the art, once they understand the basic inventive concept of this utility model, can make several improvements and modifications without departing from the principles described herein. These improvements and modifications should also be considered within the protection scope of this utility model. Therefore, the appended claims are intended to be interpreted as including the preferred embodiment as well as all changes and modifications falling within the scope of the embodiments of this utility model.

Claims

1. A gas pump characterized by, The air pump includes: A piston cylinder having a piston chamber having a pumping port; A piston is disposed in the piston chamber, and the sealing end of the piston has an air inlet, which is connected to the pumping port through the piston chamber. An intake check valve is disposed at the head of the piston and on the side end face of the piston rod facing away from the piston. A driving device, connected to the piston, adapted to perform telescopic movement along the extension direction of the piston chamber; and A pressure-holding device is installed at the outlet end of the piston cylinder. The pressure-holding device is used to communicate with the air storage chamber and is adapted to block the pump air hole when the pressure at the inlet end of the air storage chamber reaches a predetermined pressure value.

2. The air pump according to claim 1, characterized in that, When the air intake check valve is fitted to the side end face of the piston, it is suitable for blocking the air intake hole; when a gap is formed between the air intake check valve and the air intake hole, it is suitable for enabling communication between the external space and the piston cavity and for injecting air into the piston cavity.

3. The gas pump of claim 2, wherein, The pressure-holding device includes: The pressure-holding housing has an open end that, together with the side end face of the piston cylinder, forms a pressure-holding cavity; the pressure-holding housing has an air outlet structure that communicates with the pressure-holding cavity; A sealing check assembly is disposed within the pressure holding chamber, and the sealing check assembly is adapted to block the pump air hole when the pressure within the pressure holding chamber is not lower than a set pressure.

4. The air pump according to claim 3, characterized in that, The pressure-holding housing is detachably connected to the piston cylinder.

5. The gas pump of claim 3, wherein, The sealing check assembly includes: A sealing element is disposed within the pressure-holding cavity, and the sealing element abuts against the pump air hole; the area of ​​the sealing element is not less than the area of ​​the pump air hole; An elastic element has one end abutting against the end of the sealing element away from the air pump orifice, and the other end is adapted to press the sealing element tightly against the air pump orifice.

6. The air pump according to claim 5, characterized in that, The sealing component can be a flexible or rigid component.

7. The gas pump of claim 1, wherein The piston includes: A piston body, the outer contour of which is adapted to the inner peripheral wall of the piston cavity; the air inlet hole penetrates the wall thickness of the piston body; and The piston rod is disposed at the end of the piston body away from the pressure-holding device; the end of the piston rod away from the piston body is connected to the driving device.

8. The gas pump of claim 7, wherein, The piston rod is equipped with a weight-reducing structure.

9. The gas pump of claim 7, wherein, The distance d1 from the geometric center of the air inlet to the central axis of the piston body and the distance d2 from the geometric center of the air inlet to the outer contour surface of the piston body satisfy: d1 < d2.

10. The gas pump of claim 7, wherein, The piston body is provided with a flexible sealing element, the outer contour of which is adapted to the inner peripheral wall of the piston cavity to seal the piston cavity.

11. The gas pump of any one of claims 1 to 10, wherein, The air intake check component includes a fixed end and an elastic check end. The fixed end is used to fix it to the side end face of the piston. When air is injected, the elastic check end bends away from the air intake hole. After the air is injected, the elastic check end blocks the air intake hole again.

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