Negative pressure generator and negative pressure massager

Abstract

The present invention discloses a negative pressure generator and a negative pressure massager. The negative pressure generator includes a cavity having a suction port, a piston disposed in the cavity, and a driving device for driving the piston to reciprocate in the cavity to generate negative pressure at the suction port. The negative pressure generator and the negative pressure massager provided by the present invention can improve the adsorption effect.

Description

Technical Field

[0001] The present invention relates to the field of massage devices, and particularly to a negative pressure generator and a negative pressure massager. Background Art

[0002] With the acceleration of the pace of life, the pressure at work has also increased accordingly. After a day's work, the human body is extremely tired and sore all over. In order to relieve fatigue and soreness, people usually use various massagers to massage the body, such as negative pressure massagers. The negative pressure massager relieves fatigue and soreness by sucking and relaxing the skin, so as to achieve the purpose of soothing the body and mind. However, the adsorption effect of the negative pressure massager in the related art is not good.

[0003] Therefore, it is necessary to improve the existing negative pressure massager to avoid the above defects. Summary of the Invention

[0004] The purpose of the present invention is to provide a negative pressure generator that can improve the adsorption effect and a negative pressure massager using the negative pressure generator. e

[0005] The technical solution of the present invention is as follows:

[0006] A negative pressure generator includes a cavity having an adsorption port, a piston disposed in the cavity, and a driving device for driving the piston to reciprocate in the cavity to generate negative pressure at the adsorption port.

[0007] Preferably, the piston includes a piston body and a sealing ring disposed on the outer periphery of the piston body to achieve sealing between the piston and the cavity wall of the cavity.

[0008] Preferably, a sealing groove is provided on the outer periphery of the piston body, and the sealing ring is embedded in the sealing groove.

[0009] Preferably, the sealing ring includes an arc portion spaced from the piston body and fixing portions extending from the arc portion along two opposite sides in the reciprocating movement direction of the piston into the sealing groove and embedded in the sealing groove. Among them, a collapse space is formed by enclosing the arc portion, the fixing portion and the piston body, and the arc portion can collapse into the collapse space.

[0010] Preferably, the negative pressure generator further includes a massage member, and the massage member includes a holding portion fixed to one side of the piston body facing the adsorption port and at least one massage protrusion provided on the side of the holding portion away from the piston body.

[0011] Preferably, the massage member and the sealing ring are integrally formed, and the periphery of the holding portion is connected to the sealing ring.

[0012] Preferably, the piston divides the cavity into a first chamber and a second chamber. The first chamber is in communication with the adsorption port. The piston includes a one-way exhaust structure that can communicate the first chamber and the second chamber.

[0013] Preferably, the one-way exhaust structure includes an exhaust hole that penetrates the piston body for communicating the first chamber and the second chamber, and an exhaust plug fixedly provided on the piston body and covering the side of the exhaust hole away from the first chamber.

[0014] Preferably, the exhaust plug includes a main body portion fixedly provided on the side of the piston body away from the adsorption port and a covering portion covering the exhaust hole. The covering portion is made of an elastic material.

[0015] Preferably, the exhaust plug includes a main body portion fixedly provided on the side of the piston body away from the adsorption port and a surrounding wall. The main body portion has a through hole communicating with the exhaust hole. The surrounding wall extends from the periphery of the through hole into the second chamber. The surrounding wall is made of an elastic material and closes the through hole.

[0016] Preferably, the cavity includes a rigid cavity with an opening and a flexible bladder. The piston is arranged in the rigid cavity. The flexible bladder is connected to the opening of the rigid cavity. The flexible bladder has an air passage communicating with the opening. The air passage forms the adsorption port at its end away from the opening.

[0017] Preferably, the rigid cavity includes a first chamber wall extending along the movement direction of the piston and enclosing to form the opening, and a second chamber wall provided at one end of the first chamber wall away from the opening. A transmission member is movably penetrated through the second chamber wall. The transmission member connects the piston and the driving device.

[0018] Preferably, a leakage hole is penetrated through the second chamber wall.

[0019] Preferably, a self-lubricating bushing is provided between the transmission member and the second chamber wall.

[0020] Preferably, the driving device includes a transmission assembly and a motor. The motor is connected to the transmission member through the transmission assembly. Among them, the transmission assembly is any one of an eccentric transmission structure, a cam, and a ball screw.

[0021] Preferably, the transmission assembly includes an eccentric member and a connecting rod that are transmission-connected. The eccentric member is connected to the motor, and the connecting rod is hinged to the transmission member.

[0022] Preferably, the driving device is an electromagnetic driver, which includes a first magnetic member and a second magnetic member connected to the transmission member. Wherein, one of the first magnetic member and the second magnetic member includes a coil, and the other is a magnet. When the coil is energized, the interaction force between the first magnetic member and the second magnetic member drives the piston to reciprocate.

[0023] Preferably, a heating coil or a semiconductor refrigeration sheet is provided on the outer periphery of the first cavity wall.

[0024] The present invention also provides a negative pressure massager, which includes the negative pressure generator described in any one of the above.

[0025] Compared with the related art, the negative pressure generator provided by the present invention can improve the adsorption effect by arranging a piston in the cavity and driving the piston to reciprocate in the cavity through a driving device to generate negative pressure at the adsorption port. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is an exploded view of Embodiment 1 of the negative pressure generator provided by the present invention;

[0027] Figure 2 is Figure 1 a schematic structural diagram of the assembled negative pressure generator shown;

[0028] Figure 3 is Figure 2 a cross-sectional view of the negative pressure generator shown;

[0029] Figure 4 is Figure 3 an enlarged view of part a of the negative pressure generator shown;

[0030] Figure 5 is a schematic structural diagram of part of the structure in Embodiment 2 of the negative pressure generator provided by the present invention

[0031] Figure 6 is Figure 5 a schematic structural diagram of the massage member and the sealing ring in the part of the structure shown;

[0032] Figure 7 is a schematic structural diagram of Embodiment 3 of the negative pressure generator provided by the present invention;

[0033] Figure 8 is Figure 7 a schematic structural diagram of the exhaust plug in the negative pressure generator shown;

[0034] Figure 9 is Figure 7 a schematic structural diagram of the assembled negative pressure generator shown;

[0035] Figure 10 isFigure 9 Cross-sectional view of the shown negative pressure generator;

[0036] Figure 11 Schematic structural diagram of the fourth embodiment of the negative pressure generator provided by the present invention;

[0037] Figure 12 is Figure 11 Schematic structural diagram of the exhaust plug in the shown negative pressure generator;

[0038] Figure 13 is Figure 12 Bottom view of the shown exhaust plug;

[0039] Figure 14 Schematic structural diagram of the massage member and the sealing ring in the negative pressure generator with a one-way exhaust structure. Detailed implementation manners

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0041] Embodiment 1

[0042] Please refer to Figures 1 to 4 , the negative pressure generator includes a cavity 1 having a suction port 1A, a piston 3 disposed in the cavity 1, and a driving device 5 for driving the piston 3 to reciprocate in the cavity 1 to generate negative pressure at the suction port 1A. Among them, the piston 3 can divide the cavity 1 into a first chamber 1B and a second chamber 1C, and the first chamber 1B is communicated with the suction port 1A. During use, the suction port 1A is attached to a human body part. When the driving device 5 drives the piston 3 to move away from the suction port 1A, the first chamber 1B generates negative pressure due to the increase in volume, thereby generating negative pressure at the suction port 1A.

[0043] The cavity 1 includes a rigid cavity 11 having an opening 11A and a flexible bladder 13. The piston 3 is disposed in the rigid cavity 11. The flexible bladder 13 is connected to the opening 11A of the rigid cavity 11. The flexible bladder 13 has an air passage 13A communicated with the opening 11A, and the air passage 13A forms the suction port 1A at its end far from the opening 11A.

[0044] In this embodiment, the flexible bladder 13 and the rigid cavity 11 are integrally formed. It can be understood that in other embodiments, the flexible bladder 13 and the rigid cavity 11 can also be connected by means of adhesives or the like.

[0045] As Figure 3 shown, the rigid cavity 11 includes a first cavity wall 111 extending along the moving direction of the piston 3 and enclosing to form the opening 11A, and a second cavity wall 113 disposed at one end of the first cavity wall 111 away from the opening 11A. A transmission member 7 is movably disposed through the second cavity wall 113. The transmission member 7 is connected to the piston 3 and the driving device 5 so that the driving device 5 drives the transmission member 7 to move to drive the piston 3 to reciprocate in the cavity 1.

[0046] As shown in FIG. 3, a self-lubricating bushing 6 is provided between the second cavity wall 113 and the transmission member 7 so that the transmission member 7 movably passes through the second cavity wall 113 and reduces the sliding resistance of the transmission member 7.

[0047] In this embodiment, a leakage hole 115 is provided through the second cavity wall 113. As Figure 1 shown, a plurality of the leakage holes 115 are provided. By providing the leakage holes 115, when the piston 3 moves away from the adsorption port 1A, the second cavity 1C discharges air to the outside through the leakage holes 115, so that the resistance when the piston 3 moves away from the adsorption port 1A can be reduced. Further preferably, the leakage holes 115 penetrate through the second cavity wall 113 along the moving direction of the piston 3.

[0048] The piston 3 includes a piston body 31 and a sealing ring 33 disposed on the outer periphery of the piston body 31 to achieve sealing between the piston 3 and the cavity wall of the cavity 1 (specifically, the piston 3 and the first cavity wall 111 are sealed by the sealing ring 33).

[0049] Wherein, the transmission member 7 is fixedly connected to the piston body 31.

[0050] In this embodiment, a sealing groove 311 is provided on the outer periphery of the piston body 31, and the sealing ring 33 is embedded in the sealing groove 311.

[0051] In this embodiment, the sealing ring 33 includes an arc portion 331 disposed at an interval from the piston body 31 and fixing portions 333 extending from two opposite sides of the arc portion 331 along the reciprocating motion direction of the piston 3 into the sealing groove 311 and embedded in the sealing groove 311. Among them, the arc portion 331, the fixing portions 333 and the piston body 31 enclose a collapse space 33A, and the arc portion 331 can collapse towards the collapse space 33A, so as to avoid the problem of jamming when the piston 3 reciprocates in the cavity 1. It can be understood that in other embodiments, the sealing ring 33 can adopt a conventional O-ring in the prior art, for example, a conventional rubber sealing ring.

[0052] As Figure 4 shown, the center of curvature of the arc portion 331 is located on the side facing the collapse space 33A.

[0053] The driving device 5 includes a transmission assembly 51 and a motor 53. The motor 53 is connected to the transmission member 7 through the transmission assembly 51. Among them, the transmission assembly 51 can be any one of an eccentric transmission structure, a cam, and a ball screw.

[0054] In this embodiment, the transmission assembly 51 is an eccentric transmission structure. The transmission assembly 51 includes an eccentric member 511 and a connecting rod 513 that are transmission-connected. The eccentric member 511 is connected to the motor 53, and the connecting rod 513 is hinged to the transmission member 7. When the negative pressure generator works, the motor 53 drives the piston 3 to reciprocate in the cavity 1 through the eccentric member 511, the connecting rod 513 and the transmission member 7 in sequence.

[0055] Embodiment Two

[0056] Please refer to Figure 5 and Figure 6 , the difference between Embodiment Two and Embodiment One is only that: the negative pressure generator further includes a massage member 4. The massage member 4 includes a holding portion 41 fixed on the side of the piston body 31 facing the adsorption port 1A and at least one massage protrusion 43 provided on the side of the holding portion 41 away from the piston body 31. At least a part of the massage protrusion 43 can extend out of the adsorption port 1A. Specifically, when the piston 3 moves to the maximum position towards the adsorption port 1A, at least a part of the massage protrusion 43 can extend out of the adsorption port 1A, so that the massage protrusion 43 can massage the human body part to improve the user experience effect.

[0057] In this embodiment, the massage member 4 and the sealing ring 33 are integrally formed, wherein the periphery of the holding portion 41 is connected to the sealing ring 33. It can be understood that in other embodiments, the massage member 4 and the sealing ring 33 may also be provided as two independent components (that is, the massage member 4 is not integrally formed with the sealing ring 33), wherein the holding portion 41 can be fixed to the piston body 31 by means of adhesives.

[0058] Embodiment Three

[0059] Please refer to Figures 7 to 10 , the difference between Embodiment Three and Embodiment One is only that:

[0060] The piston 3' further includes a one-way exhaust structure 35 that can communicate the first chamber 1B and the second chamber 1C. When the piston 3' moves toward the adsorption port 1A, the one-way exhaust structure 35 communicates the first chamber 1B and the second chamber 1C under the action of the air pressure in the first chamber 1B; when the piston 3' moves away from the adsorption port 1A, the one-way exhaust structure 35 blocks the communication between the first chamber 1B and the second chamber 1C under the action of the air pressure in the second chamber 1C. By providing the one-way exhaust structure 35, a negative pressure can be generated at the adsorption port 1A when the piston 3' moves away from the adsorption port 1A, and the first chamber 1B can exhaust to the second chamber 1C through the one-way exhaust structure 35 when the piston 3' moves toward the adsorption port 1A, and the second chamber 1C is communicated with the outside, so as to reduce the resistance when the piston 3' moves toward the adsorption port 1A.

[0061] The one-way exhaust structure 35 includes an exhaust hole 351 that penetrates the piston body 31 for communicating the first chamber 1B and the second chamber 1C, and an exhaust plug 353 that is fixed to the piston body 31 and covers the side of the exhaust hole 351 away from the first chamber 1B. When the piston 3' moves toward the adsorption port 1A, the exhaust plug 353 opens the exhaust hole 351 under the action of the air pressure in the first chamber 1B to communicate the first chamber 1B and the second chamber 1C; when the piston 3' moves away from the adsorption port 1A, the exhaust plug 353 closes the exhaust hole 351 under the action of the air pressure in the second chamber 1C to block the communication between the first chamber 1B and the second chamber 1C.

[0062] As Figure 8 and Figure 10 shown, the exhaust plug 353 is generally in the shape of an annular thin sheet, and the exhaust plug 353 can undergo elastic deformation. For example, the exhaust plug 353 can be made of silica gel material, so that the exhaust plug 353 has both flexibility and elasticity. Specifically, as Figure 8As shown, the exhaust plug 353 includes a main body portion 355 fixedly provided on a side of the piston body 31 away from the adsorption port 1A and a covering portion 357 covering the exhaust hole 351. The main body portion 355 has a through hole 356, and the covering portion 357 extends from a part of the inner periphery of the through hole 356 into the through hole 356, and the covering portion 357 can move in the through hole 356.

[0063] When the piston 3' moves away from the adsorption port 1A, since the volume of the first chamber 1B increases, the air pressure therein decreases (when the difference between the air pressure in the first chamber 1B and the air pressure in the second chamber 1C is not sufficient to overcome the elastic deformation resistance of the covering portion 357), the first chamber 1B forms a negative pressure and generates an adsorption force at the adsorption port 1A. Under the action of the negative pressure, the covering portion 357 covers the exhaust hole 351 to block the communication between the first chamber 1B and the second chamber 1C. As the volume of the first chamber 1B continues to increase, the covering portion 357 also remains covering the exhaust hole 351 under the action of the air pressure in the second chamber 1C, so as to maintain the seal between the first chamber 1B and the second chamber 1C and maintain the adsorption state of the adsorption port 1A.

[0064] When the piston 3' moves towards the adsorption port 1A, first, the movement of the piston 3' reduces the volume of the first chamber 1B, thereby reducing and eliminating the negative pressure in the first chamber 1B. Then the piston 3' presses the first chamber 1B, resulting in an increase in the air pressure in the first chamber 1B. When the air pressure in the first chamber 1B increases (the air pressure in the first chamber 1B is greater than the air pressure in the second chamber 1C) to a level sufficient to overcome the elastic deformation resistance of the covering portion 357, the covering portion 357 undergoes elastic deformation under the action of the air pressure in the first chamber 1B to open the exhaust hole 351 and discharge the air in the first chamber 1B, thereby reducing the movement resistance of the piston 3'.

[0065] Wherein, the main body portion 355 can be fixedly connected to the piston body 31 by an adhesive method.

[0066] As Figure 7 and [[ID=!5]] Figure 8 As shown, a plurality of exhaust holes 351 are provided, and correspondingly, a plurality of through holes 356 and covering portions 357 are also provided.

[0067] In this embodiment, the cavity 11 is provided with a heating coil 9 or a thermoelectric cooler 9. Specifically, a thermoelectric cooler 9 is further provided on the outer periphery of the first cavity wall 111. Wherein, the thermoelectric cooler 9 can be arranged such that its hot end is close to the first cavity wall 111, or can be arranged such that its cold end is close to the first cavity wall 111. In this way, the thermoelectric cooler 9 can be used to adjust the body feeling temperature of the human body part with respect to the flexible bladder 13, thereby improving the massage experience. It can be understood that in other embodiments, the thermoelectric cooler 9 can also be replaced with a heating coil 9.

[0068] As Figure 1 shown, the sealing ring 33' is a conventional O-shaped sealing ring in the prior art, for example, a rubber sealing ring. It should be noted that in this embodiment, the sealing ring 33' can also adopt the sealing ring shown in the first embodiment (that is, the sealing ring 33' includes an arc portion 331 spaced apart from the piston body 31 and fixing portions 333 extending from the two opposite sides of the arc portion 331 along the reciprocating movement direction of the piston 3' into the sealing groove 311 and embedded in the sealing groove 311. Wherein, the arc portion 331, the fixing portion 333 and the piston body 31 enclose a collapse space 33A, and the arc portion 331 can collapse into the collapse space 33A).

[0069] Embodiment Four

[0070] Please refer to Figures 11 to 13 together. The difference between Embodiment Four and Embodiment Three is only that: the exhaust plug 353' includes a main body portion 355' fixed on the side of the piston body 31 away from the adsorption port 1A and an enclosure wall 359. The main body portion 355' has a through hole 356' communicating with the exhaust hole 351, and the enclosure wall 359 extends from the periphery of the through hole 356' into the second cavity 1C.

[0071] The enclosure wall 359 is made of an elastic material. The enclosure wall 359 encloses a channel 358 communicating with the through hole 356'. In a static state, the enclosure wall 359 closes the channel 358 or makes the channel 358 substantially closed (only having a gap) through its own elastic force.

[0072] When the piston 3'' moves away from the adsorption port 1A, since the volume of the first chamber 1B increases, the air pressure inside it decreases (when the difference between the air pressure in the first chamber 1B and the air pressure in the second chamber 1C is not sufficient to overcome the elastic deformation resistance of the surrounding wall 359), a negative pressure is formed in the first chamber 1B, and an adsorption force is generated at the adsorption port 1A. Under the action of the negative pressure, the surrounding wall 359 closes to block the communication between the through hole 356' and the second chamber 1C, and as the volume of the first chamber 1B continues to increase, the surrounding wall 359 remains closed under the action of the air pressure in the second chamber 1C.

[0073] When the piston 3'' moves towards the adsorption port 1A, first, the piston 3'' moves to reduce the volume of the first chamber 1B, thereby reducing and eliminating the negative pressure in the first chamber 1B. Then, the piston 3'' squeezes the first chamber 1B, causing the air pressure in the first chamber 1B to increase. When the air pressure in the first chamber 1B increases (the air pressure in the first chamber 1B is greater than the air pressure in the second chamber 1C) to a level sufficient to overcome the elastic deformation resistance of the surrounding wall 359, the surrounding wall 359 undergoes elastic deformation under the action of the air pressure in the first chamber 1B to open the channel 358. The channel 358 connects the through hole 356' and the second chamber 1C (that is, the first chamber 1B and the second chamber 1C are connected through the through hole 356', the channel 358, and the exhaust hole 351).

[0074] It should be noted that the one-way exhaust structure is not limited to the one-way exhaust structures shown in Embodiments 3 and 4. For example, the one-way exhaust structure can be set as a one-way valve that penetrates the piston body 31 and is fixed to the piston body 31. The exhaust plugs 353 and 353' of the one-way exhaust structures in Embodiments 3 and 4 can also be exhaust plugs with a flat plate structure made of a rigid material. Correspondingly, the exhaust plug with a flat plate structure and the piston body 31 can be connected by a spring. When the air pressure in the first chamber 1B increases (the air pressure in the first chamber 1B is greater than the air pressure in the second chamber 1C) to a level sufficient to overcome the elastic deformation resistance of the spring, the exhaust plug with a flat plate structure opens the exhaust hole 351 under the action of the air pressure in the first chamber 1B. When the piston moves away from the adsorption port 1A, since the volume of the first chamber 1B increases, the air pressure inside it decreases (when the difference between the air pressure in the first chamber 1B and the air pressure in the second chamber 1C is not sufficient to overcome the elastic deformation resistance of the spring), the exhaust plug with a flat plate structure covers the exhaust hole 351 to block the communication between the first chamber 1B and the second chamber 1C, and as the volume of the first chamber 1B continues to increase, the exhaust plug with a flat plate structure remains covering the exhaust hole 351 under the action of the air pressure in the second chamber 1C.

[0075] It should also be noted that the negative pressure generator with a one-way exhaust structure is not limited to the negative pressure generators described in Embodiment 3 and Embodiment 4. For example, as shown in 14, the negative pressure generator with a one-way exhaust structure may further include a massage member 4 as shown in 14. The massage member 4 includes a holding portion 41 fixed to the side of the piston body 31 facing the adsorption port 1A, and a plurality of massage protrusions 43 are provided on the side of the holding portion 41 away from the piston body 31, and at least a part of the massage protrusions 43 can protrude out of the adsorption port 1A. In order to enable the one-way exhaust structure to communicate with the first chamber 1B and the second chamber 1C, correspondingly, a through hole 411 communicating with the exhaust hole 351 is provided through the holding portion 41; further, as Figure 14 shown, the massage member 4 and the sealing ring 33 may also be integrally formed, wherein the periphery of the holding portion 41 is connected to the sealing ring 33.

[0076] It should also be noted that the structure of the driving device 5 is not limited to the structures described in Embodiment 1 to Embodiment 4. For example, the driving device may also be an electromagnetic driver. The electromagnetic driver includes a first magnetic member and a second magnetic member connected to the transmission member. Among them, one of the first magnetic member and the second magnetic member includes a coil, and the other is a magnet. When the coil is energized, the mutual force between the first magnetic member and the second magnetic member can drive the piston to reciprocate.

[0077] Among them, the magnet can be a permanent magnet or an electromagnet.

[0078] The present invention also provides a negative pressure massager, and the negative pressure massager includes the negative pressure generator described above.

[0079] The above are only the embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the inventive concept of the present invention, improvements can still be made, but these all belong to the protection scope of the present invention.

Claims

1. A negative pressure generator, characterized in that, It includes a cavity (1) having a suction port (1A), a piston (3, 3', 3'') provided in the cavity (1), a driving device (5) for driving the piston (3, 3', 3'') to reciprocate in the cavity (1) to generate negative pressure at the suction port (1A), and a massage member (4). The cavity (1) includes a rigid cavity (11) having an opening (11A) and a flexible bladder (13). The piston (3, 3', 3'') is provided in the rigid cavity (11). The flexible bladder (13) is connected to the opening (11A) of the rigid cavity (11). The flexible bladder (13) has an air passage (13A) communicating with the opening (11A), and the air passage (13A) forms the suction port (1A) at its end remote from the opening (11A). The piston (3, 3', 3'') includes a piston body (31) and sealing rings (33, 33') provided on the outer periphery of the piston body (31) to achieve sealing between the piston (3, 3', 3'') and the cavity wall of the cavity (1). The massage member (4) includes a holding portion (41) fixed to the side of the piston body (31) facing the suction port (1A) and at least one massage protrusion (43) provided on the side of the holding portion (41) remote from the piston body (31). At least part of the massage protrusion (43) can protrude from the suction port (1A). The massage member (4) is integrally formed with the sealing rings (33, 33'), and the periphery of the holding portion (41) is connected to the sealing rings (33, 33').

2. The negative pressure generator according to claim 1, characterized in that, A sealing groove (311) is provided on the outer periphery of the piston body (31), and the sealing rings (33, 33') are embedded in the sealing groove (311).

3. The negative pressure generator according to claim 2, characterized in that, The sealing rings (33, 33') include an arc portion (331) spaced from the piston body (31) and fixing portions (333) extending from the arc portion (331) into the sealing groove (311) respectively along two opposite sides in the reciprocating movement direction of the piston (3, 3', 3'') and embedded in the sealing groove (311). Wherein, the arc portion (331), the fixing portions (333) and the piston body (31) enclose a collapse space (33A), and the arc portion (331) can collapse into the collapse space (33A).

4. The negative pressure generator according to claim 1, wherein, The piston (3, 3', 3'') divides the cavity (1) into a first chamber (1B) and a second chamber (1C). The first chamber (1B) communicates with the suction port (1A). The piston (3', 3'') further includes a one-way exhaust structure (35) that can communicate the first chamber (1B) and the second chamber (1C).

5. The negative pressure generator according to claim 4, characterized in that, The one-way exhaust structure (35) includes an exhaust hole (351) that penetrates through the piston body (31) for communicating the first chamber (1B) and the second chamber (1C), and an exhaust plug (353, 353') fixedly provided on the piston body (31) and covering the side of the exhaust hole (351) away from the first chamber (1B).

6. The negative pressure generator according to claim 5, wherein, The exhaust plug (353) includes a main body portion (355) fixedly provided on the side of the piston body (31) away from the adsorption port (1A), and a covering portion (357) covering the exhaust hole (351), and the covering portion (357) is made of an elastic material.

7. The negative pressure generator according to claim 5, wherein The exhaust plug (353') includes a main body portion (355) fixedly provided on the side of the piston body (31) away from the adsorption port (1A), and a surrounding wall (359). The main body portion (355) has a through hole (356') communicating with the exhaust hole (351). The surrounding wall (359) extends from the periphery of the through hole (356') into the second chamber (1C), and the surrounding wall (359) is made of an elastic material and closes the through hole (356').

8. The negative pressure generator according to claim 1, characterized in that, The rigid cavity (11) includes a first cavity wall (111) that extends along the movement direction of the piston (3, 3', 3'') and encloses to form the opening (11A), and a second cavity wall (113) provided at one end of the first cavity wall (111) away from the opening (11A). A transmission member (7) is movably penetrated through the second cavity wall (113), and the transmission member (7) connects the piston (3, 3', 3'') and the driving device (5).

9. The negative pressure generator according to claim 8, wherein, A leakage hole (115) is penetrated through the second cavity wall (113).

10. The negative pressure generator according to claim 8, wherein, A self-lubricating bushing (6) is provided between the transmission member (7) and the second cavity wall (113).

11. The negative pressure generator according to claim 8, characterized in that, The driving device (5) includes a transmission assembly (51) and a motor (53). The motor (53) is connected to the transmission member (7) through the transmission assembly (51), and among them, the transmission assembly (51) is any one of an eccentric transmission structure, a cam, and a ball screw.

12. The negative pressure generator according to claim 11, characterized in that, The transmission assembly (51) includes an eccentric member (511) and a connecting rod (513) that are transmission-connected. The eccentric member (511) is connected to the motor (53), and the connecting rod (513) is hinged to the transmission member (7).

13. The negative pressure generator according to claim 8, wherein, The driving device (5) is an electromagnetic driver, which includes a first magnetic member and a second magnetic member connected to the transmission member (7). Among them, one of the first magnetic member and the second magnetic member includes a coil, and the other is a magnet. When the coil is energized, the interaction force between the first magnetic member and the second magnetic member drives the piston (3, 3', 3'') to reciprocate.

14. The negative pressure generator according to claim 1, wherein, The cavity is provided with a heating coil or a semiconductor refrigeration sheet.

15. A negative pressure massager, including the negative pressure generator according to any one of claims 1-14.

Images