Negative pressure massager

Abstract

The utility model discloses a negative pressure massager, which comprises a piston cylinder, a piston rod, a pressure sensor, a pressure sensor, a pressure sensor, a pressure sensor, a pressure sensor, a pressure sensor, a pressure sensor and a pressure sensor, the piston cylinder is internally provided with a piston cavity and comprises a first end and a second end, and the first end and the second end are respectively provided with an opening to be communicated with the piston cavity; the piston structure is inserted into the piston cavity; the piston structure is sleeved with the flexible part, the flexible part at least comprises a flexible piece, and the flexible piece extends in the direction close to the inner wall of the piston cylinder so as to make contact with the inner wall of the piston cylinder in the circumferential direction; and the driving structure is connected with the piston structure so as to drive the piston structure to reciprocate in the piston cylinder. According to the negative pressure massager, the piston structure is in flexible contact with the inner wall of the piston cylinder through the flexible piece, friction force is small, and noise is low.

Description

Technical Field

[0001] This application relates to the field of massage devices, and particularly to a negative pressure massager. Background Art

[0002] To relieve fatigue, people use negative pressure massagers for body massage, such as relaxation massage on the back of the hand. The massager can generate alternating positive and negative pressure adsorption to relax the skin. However, in current massagers, the piston structure is in close contact with the inner wall of the piston cylinder through a sealing ring, resulting in too much friction between the piston structure and the piston cylinder, and thus it is easy to generate relatively large noise. Summary of the Utility Model

[0003] Based on this, the problem to be solved by this application is to provide a negative pressure massager in which the piston structure is in flexible contact with the inner wall of the piston cylinder, with small friction and low noise.

[0004] This application provides a negative pressure massager, including:

[0005] A piston cylinder with a piston chamber inside. The piston cylinder includes a first end and a second end, and both the first end and the second end are provided with openings to communicate with the piston chamber respectively;

[0006] A piston structure inserted into the piston chamber;

[0007] A flexible member sleeved on the piston structure. The flexible member includes at least one flexible sheet, and the flexible sheet extends towards the inner wall of the piston cylinder to circumferentially contact the inner wall of the piston cylinder;

[0008] A driving structure connected to the piston structure to drive the piston structure to reciprocate in the piston cylinder.

[0009] In one embodiment, the flexible member further includes a cylindrical portion sleeved on the piston structure. Each flexible sheet is sequentially arranged on the outer circumferential wall of the cylindrical portion along the movement direction of the piston structure, and each flexible sheet extends towards the inner wall of the piston cylinder until it circumferentially contacts the inner wall of the piston cylinder.

[0010] In one embodiment, the cylindrical portion and each flexible sheet are integrally provided.

[0011] In one embodiment, the piston structure includes a piston. The piston has a base portion and a plug portion provided on the base portion. The plug portion is rod-shaped, the flexible member is sleeved outside the plug portion, and the base portion is provided with a first abutting surface facing the flexible member, and the first abutting surface abuts against the bottom surface of the flexible member.

[0012] In one embodiment, the piston structure further includes a shielding member, the shielding member having a top seat portion and a connecting portion, the connecting portion being inserted into and engaged with the plugging portion to form a rod-like structure, the flexible member being sleeved on the rod-like structure, the top seat portion facing the flexible member and having a second abutting surface, the second abutting surface abutting against the top surface of the flexible member.

[0013] In one embodiment, the driving structure includes a driving motor, a connecting rod and an eccentric member, the working end of the driving motor being connected to the connecting rod through the eccentric member to drive the connecting rod to reciprocate, the connecting rod being connected to the piston structure to drive the piston structure to move.

[0014] In one embodiment, the driving motor is provided as a double-headed driving motor, the connecting rod includes two crank arm portions extending from the middle position of the double-headed driving motor to both ends, and an output end portion provided at the middle position between the two crank arm portions, each of the crank arm portions being connected to the two working ends of the double-headed driving motor through the eccentric member, the output end portion being connected to the piston structure.

[0015] In one embodiment, a pin seat is provided at one end of the piston structure connected to the driving structure, a pin shaft is rotatably inserted through the output end portion, the pin shaft being rotatably connected to the pin seat so that the piston structure and the output end can rotate relative to each other.

[0016] In one embodiment, it further includes:

[0017] A housing, internally provided with a receiving cavity for receiving the piston cylinder and the driving structure, the housing being provided with a receiving hole, the opening at the first end of the piston cylinder being communicated with the receiving hole, the shielding member being received in the receiving hole to shield the interior of the piston cylinder;

[0018] A decorative housing, sleeved on the housing, the decorative housing being provided in a bionic shape.

[0019] In one embodiment, it further includes a flexible waterproof film, the waterproof film covering the opening at the second end of the piston cylinder, the waterproof film being provided with a sealing hole, the piston structure passing through the sealing hole and being connected to the driving structure, a seal being provided between the piston structure and the sealing hole, the waterproof film being fixedly connected to the piston structure to move along with the piston structure; or, the waterproof film is slidably connected to the piston structure to enable the piston structure to move relative to the waterproof film.

[0020] Based on the above description, in the present application, preferably, the piston chamber is arranged as a straight cylindrical piston chamber, and both the first end and the second end of the piston cylinder are open and arranged to communicate with the straight cylindrical piston chamber. The opening at the first end is used to contact the user's skin for positive and negative pressure adsorption and skin relaxation. The piston structure is inserted into the piston cylinder and is connected to the driving structure through the opening at the second end. The driving structure drives the piston structure to reciprocate up and down in the piston cylinder to generate positive and negative pressure. The flexible member is sleeved on the piston structure, and at least one flexible piece is formed on the flexible member. The flexible piece extends horizontally to contact the circumferential inner wall of the piston cylinder, so as to push the gas in the piston cylinder as the piston structure moves, forming positive and negative pressure. Since the flexible piece is in flexible contact with the inner wall of the piston cylinder, the friction force is small and the generated sound is also small. Moreover, the flexible piece can be pushed open when the internal pressure in the piston cylinder is relatively large, which can effectively avoid generating a large adsorption force and maintain the positive and negative pressure within a suitable range to improve the comfort of the user. Description of the Drawings

[0021] Figure 1 Structural schematic diagram of the negative pressure massager provided by an embodiment of the present application;

[0022] Figure 2 Exploded structural schematic diagram of the negative pressure massager provided by an embodiment of the present application;

[0023] Figure 3 Partial structural schematic diagram of the negative pressure massager provided by an embodiment of the present application;

[0024] Figure 4 Partial exploded structural schematic diagram of the negative pressure massager provided by an embodiment of the present application;

[0025] Figure 5 One of the sectional structural schematic diagrams of the negative pressure massager provided by an embodiment of the present application;

[0026] Figure 6 Another sectional structural schematic diagram of the negative pressure massager provided by an embodiment of the present application.

[0027] Reference numerals: 1 - decorative housing; 11 - hole; 2 - outer shell; 21 - accommodation cavity; 22 - accommodation hole; 3 - piston cylinder; 4 - piston structure; 5 - driving structure; 6 - control unit; 7 - battery; 31 - first end; 32 - second end; 33 - piston cavity; 41 - piston; 42 - flexible member; 43 - shielding member; 51 - driving motor; 52 - eccentric member; 53 - connecting rod; 431 - top seat portion; 432 - connecting portion; 4311 - second abutting surface; 421 - cylindrical portion; 422 - flexible sheet; 412 - insertion portion; 411 - base portion; 413 - pin seat; 4111 - first abutting surface; 54 - pin shaft; 511 - working end; 531 - crank arm portion; 532 - output end portion; 34 - waterproof film. Detailed implementation manners

[0028] To make the above objects, features, and advantages of the present application more obvious and understandable, the following detailed description of the specific embodiments of the present application will be given with reference to the accompanying drawings.

[0029] It should be noted that the terms "first", "second", etc. in the description, claims, and accompanying drawings of the present application are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here.

[0030] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "arranged", "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0031] In the description of this specification, the descriptions referring to terms such as "embodiment", "one embodiment", and "one implementation manner" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or implementation manner are included in at least one embodiment or implementation manner of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or implementation manner. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or implementation manners in a suitable manner.

[0032] The following gives a detailed description of the present application with reference to the accompanying drawings.

[0033] To solve the above technical problems, in combination with Figures 1-6As shown in the figure, an embodiment of the present application provides a negative pressure massager, including:

[0034] A piston cylinder 3, with a piston chamber 33 provided therein. The piston cylinder 3 includes a first end 31 and a second end 32, and both the first end 31 and the second end 32 are provided with openings to communicate with the piston chamber 33 respectively;

[0035] A piston structure 4, inserted into the piston chamber 33;

[0036] A flexible member 42, sleeved on the piston structure 4. The flexible member 42 includes at least one flexible sheet 422, and the flexible sheet 422 extends towards the inner wall of the piston cylinder 3 to be in circumferential contact with the inner wall of the piston cylinder 3;

[0037] A driving structure 5, connected to the piston structure 4 to drive the piston structure 4 to reciprocate in the piston cylinder 3.

[0038] It should be noted that preferably, the piston chamber 33 is set as a straight - tube piston chamber 33, and both the first end 31 and the second end 32 of the piston cylinder 3 are open - ended to communicate with the straight - tube piston chamber 33. The opening of the first end 31 is used to contact the user's skin for positive and negative pressure adsorption to relax the skin. The piston structure 4 is inserted into the piston cylinder 3 and is connected to the driving structure 5 through the opening of the second end 32. The driving structure 5 drives the piston structure 4 to reciprocate up and down in the piston cylinder 3 to generate positive and negative pressure. The flexible member 42 is sleeved on the piston structure 4, and at least one flexible sheet 422 is formed on the flexible member 42. The flexible sheet 422 extends horizontally to contact the circumferential inner wall of the piston cylinder 3, so as to push the gas in the piston cylinder 3 along with the movement of the piston structure 4 to form positive and negative pressure. Since the flexible sheet 422 is in flexible contact with the inner wall of the piston cylinder 3, the friction force is small and the generated sound is also small. And when the pressure inside the piston cylinder 3 is relatively large, the flexible sheet 422 can push open the flexible sheet 422, which can effectively avoid generating a large adsorption force and maintain the positive and negative pressure within a suitable range to improve the comfort of the user.

[0039] In an embodiment of the present application, as shown in combination with Figures 3-6 the figure, the flexible member 42 further includes a cylindrical portion 421, the cylindrical portion 421 is sleeved on the piston structure 4, and each flexible sheet 422 is sequentially arranged on the outer circumferential wall of the cylindrical portion 421 along the movement direction of the piston structure 4, and each flexible sheet 422 extends towards the inner wall of the piston cylinder 3 until it is in circumferential contact with the inner wall of the piston cylinder 3.

[0040] It should be noted that the flexible member 42 further includes a flexible cylindrical portion 421. The cylindrical portion 421 is a cylindrical structure with both ends open, so that it can be sleeved on the piston structure 4. The cylindrical structure has elasticity and can be fastened on the piston structure 4 without gaps to prevent gas leakage. Each of the flexible sheets 422 is sequentially arranged on the outer circumferential wall of the cylindrical portion 421 along the movement direction of the piston structure 4. Each of the flexible sheets 422 is arranged at intervals, and each single flexible sheet 422 can be in circumferential contact with the inner wall of the piston cylinder 3, so as to block the gas layer by layer, making the massager have better adsorption ability.

[0041] In an embodiment of the present application, as shown in Figure 4 the cylindrical portion 421 and each of the flexible sheets 422 are integrally provided.

[0042] It should be noted that the cylindrical structure and each of the flexible sheets 422 can be integrally provided. The flexible member 42 can be made of flexible materials such as rubber and silica gel. The integral setting of the cylindrical structure and each of the flexible sheets 422 simplifies the overall structure and is convenient for integral molding production. And the integral setting can also prevent the flexible sheet 422 from falling off during long-term reciprocating movement, resulting in malfunctions of the massager.

[0043] In an embodiment of the present application, as shown in Figures 3-6 the piston structure 4 includes a piston 41. The piston 41 has a base portion 411 and a plug portion 412 provided on the base portion 411. The plug portion 412 is provided in a rod shape. The flexible member 42 is sleeved outside the plug portion 412. The base portion 411 is provided with a first abutting surface 4111 facing the flexible member 42, and the first abutting surface 4111 abuts against the bottom surface of the flexible member 42.

[0044] It should be noted that the base portion 411 is disposed near the second end 32 of the piston cylinder 3, the insertion portion 412 is disposed on the base portion 411 and extends towards the first end 31 of the piston cylinder 3. Preferably, the insertion portion 412 and the base portion 411 are integrally formed. The diameter of the base portion 411 is smaller than the inner diameter of the piston cylinder 3 but larger than the opening diameter of the second end 32 of the piston cylinder 3, so that it can reciprocate in the piston cylinder 3 without detaching from the piston cylinder 3. In addition, the diameter of the base portion 411 is larger than the diameter of the insertion portion 412, so that the first abutting surface 4111 can be formed at the connection, and the flexible member 42 is sleeved outside the insertion portion 412. It can be understood that the flexible member 42 can be directly sleeved on the insertion portion 412 by means of adhesion, or the shielding member 43 can be arranged as described below. The first abutting surface 4111 abuts against the bottom surface of the flexible member 42 to limit the bottom surface of the flexible member 42 and prevent the flexible member 42 from being displaced while driving the flexible member 42 to move upward.

[0045] In an embodiment of the present application, as shown in combination with Figures 3-6 the piston structure 4 further includes a shielding member 43. The shielding member 43 has a top seat portion 431 and a connecting portion 432. The connecting portion 432 is inserted into the insertion portion 412 to form a rod-shaped structure. The flexible member 42 is sleeved on the rod-shaped structure. The top seat portion 431 is provided with a second abutting surface 4311 facing the flexible member 42, and the second abutting surface 4311 abuts against the top surface of the flexible member 42.

[0046] It should be noted that the top seat portion 431 is disposed near the first end 31 of the piston cylinder 3. The connecting portion 432 is disposed on the side of the top seat portion 431 facing the flexible member 42 and extends towards the second end 32 of the piston cylinder 3. Preferably, the top seat portion 431 and the connecting portion 432 are integrally formed. The connecting portion 432 is also arranged in a rod shape. The diameter of the top seat portion 431 is smaller than the opening diameter of the first end 31 of the piston cylinder 3, so that when the piston 41 moves upward to the apex, the top seat portion 431 can protrude from the piston cylinder 3 to shield the internal structure of the piston cylinder 3, making the whole more beautiful. In addition, the diameter of the top seat portion 431 is larger than the diameter of the connecting portion 432, so that the second abutting surface 4311 can be formed at the connection. The connecting portion 432 is inserted into the insertion portion 412 to form the rod-shaped structure. The flexible member 42 is sleeved on the rod-shaped structure. The second abutting surface 4311 abuts against the top surface of the flexible member 42 to limit the top surface of the flexible member 42 and prevent the flexible member 42 from being displaced while driving the flexible member 42 to move downward.

[0047] In one embodiment of the present application, in combination with Figure 3 As shown, the driving structure 5 includes a driving motor 51, a connecting rod 53 and an eccentric member 52. The working end 511 of the driving motor 51 is connected to the connecting rod 53 through the eccentric member 52 to drive the connecting rod 53 to reciprocate. The connecting rod 53 is connected to the piston structure 4 to drive the piston structure 4 to move.

[0048] It should be noted that an eccentric member 52 is provided on the working end 511 of the driving motor 51. The eccentric member 52 is connected to the connecting rod 53 through a bearing. The eccentric member 52 converts the rotational motion of the driving motor 51 into the reciprocating motion of the connecting rod 53. The connecting rod 53 is connected to the piston structure 4, that is, the connection is connected to the base portion 411 of the piston 41 to drive the piston structure 4 to reciprocate to perform positive and negative pressure adsorption on the user's skin.

[0049] In one embodiment of the present application, in combination with Figure 4 As shown, the driving motor 51 is provided as a double-headed driving motor 51. The connecting rod 53 includes two crank arm portions 531 extending from the middle position of the double-headed driving motor 51 to both ends, and an output end portion 532 provided at the middle position between the two crank arm portions 531. Each crank arm portion 531 is respectively connected to the two working ends 511 of the double-headed driving motor 51 through the eccentric member 52, and the output end portion 532 is connected to the piston structure 4.

[0050] It should be noted that preferably, the driving motor 51 is provided as a double-headed driving motor 51. The double-headed driving motor 51 has two independent working ends 511, and the two working ends 511 can be accurately synchronously controlled to ensure coordinated movement. The connecting rod 53 includes two crank arm portions 531 and an output end portion 532. Among them, one ends of the two crank arm portions 531 are connected and the other ends extend in opposite directions and are bent toward the direction close to the double-headed driving motor 51 until they are respectively connected to the two working ends 511 of the double-headed driving motor 51. The output end portion 532 is reversely provided at the connection position of the crank arm portion to be connected to the piston structure 4. The connecting rod 53 is adapted to the double-headed driving motor 51, which can improve the energy efficiency of driving the connecting rod 53 to move and reduce energy loss. Preferably, the two crank arm portions 531 and the output end portion 532 are integrally provided.

[0051] In one embodiment of the present application, in combination with Figure 4As shown, one end of the piston structure 4 connected to the drive structure 5 is provided with a pin seat 413. A pin shaft 54 is rotatably penetrated through the output end 532. The pin shaft 54 is rotatably connected to the pin seat 413, so that the piston structure 4 and the output end can rotate relative to each other.

[0052] It should be noted that in one implementation, the base portion 411 of the piston 41 forms the pin seat 413 at one end close to the drive structure 5. The pin shaft 54 is penetrated through the output end 532 and the pin seat 413, so that the base portion 411 and the output end 532 can rotate relative to each other. The design of the pin seat 413 can withstand the reciprocating inertial force transmitted by the pin shaft 54, ensuring the stability and alignment of the piston 41 in the piston cylinder 3 and preventing the piston 41 from shifting during high-speed movement. In another implementation, the base portion 411 can be directly connected to the output end 532, and further, the base portion 411 and the output end 532 can be integrally provided.

[0053] In one embodiment of the present application, in combination with Figure 1 and Figure 2 as shown, it further includes:

[0054] A housing 2 with an accommodation cavity 21 inside for accommodating the piston cylinder 3 and the drive structure 5. An accommodation hole 22 is provided on the housing 2. The opening of the first end 31 of the piston cylinder 3 is communicated with the accommodation hole 22. The shielding member 43 is accommodated in the accommodation hole 22 to shield the inside of the piston cylinder 3.

[0055] A decorative housing 1 is sleeved on the housing 2, and the decorative housing 1 is set in a bionic shape.

[0056] It should be noted that a receiving cavity 21 is provided inside the housing 2, and a receiving hole 22 is provided on the housing 2. The receiving hole 22 is communicated with the receiving cavity 21. The piston cylinder 3 and the driving structure 5 are both arranged in the receiving cavity 21. The opening of the first end 31 of the piston cylinder 3 is arranged corresponding to the receiving hole 22. When the piston 41 is at the top of the piston cylinder 3, the shielding member 43 is received in the receiving hole 22, so as to be able to shield the inside of the piston cylinder 3. In addition, a battery 7 and a control unit 6 are also provided inside the housing 2. The battery 7 is electrically connected to the control unit 6, and the control unit 6 is electrically connected to the driving motor 51 to control the operation of the driving motor 51 and supply power to the driving motor 51. A decorative housing 1 is sleeved on the housing 2. The decorative housing 1 is also provided with a hole 11 which is arranged opposite to the receiving hole 22 of the housing 2. Preferably, the decorative housing 1 is arranged in the shape of a flower to increase the overall aesthetics and interest. The hole 11 is arranged at the position of the flower center of the flower shape.

[0057] In an embodiment of the present application, as shown in combination with Figure 6 a flexible waterproof film 34 is further included. The waterproof film 34 covers the opening of the second end 32 of the piston cylinder 3. A sealing hole is provided on the waterproof film 34. The piston structure 4 passes through the sealing hole and is connected to the driving structure 5. A seal is provided between the piston structure 4 and the sealing hole. The waterproof film 34 is fixedly connected to the piston structure 4 to move along with the piston structure 4; or, the waterproof film 34 is slidably connected to the piston structure 4 to enable the piston structure 4 to move relative to the waterproof film 34.

[0058] It should be noted that by installing the waterproof film 34 at the opening of the second end 32 of the piston cylinder 3, liquid can be prevented from entering the inside of the massager through the piston cylinder 3 and damaging the internal circuit. Preferably, the waterproof film 34 is curved from the opening of the second end 32 to between the sealing holes, so that the waterproof film 34 has a surplus. When the piston structure 4 reciprocates, the waterproof film 34 can be driven to swing up and down to prevent the waterproof film 34 from shifting and causing liquid leakage.

[0059] In other embodiments, the waterproof film 34 has a certain hardness, and the waterproof film 34 and the piston structure 4 are slidably sleeved, so that the piston structure 4 can move relative to the waterproof film 34, thereby reducing the resistance of the piston structure 4 during movement and reducing the load of the driving motor 51.

[0060] It should be noted that the above technical features continue to be combined with each other to form various embodiments not listed above, which are all regarded as within the scope described in the specification of this application; moreover, for those of ordinary skill in the art, improvements or modifications can be made according to the above description, and all such improvements and modifications should fall within the protection scope of the appended claims of this application.

Claims

1. A negative pressure massager, characterized in that, Comprising: A piston cylinder (3) with a piston chamber (33) provided therein. The piston cylinder (3) includes a first end (31) and a second end (32), and both the first end (31) and the second end (32) are provided with openings to communicate with the piston chamber (33) respectively; A piston structure (4) inserted into the piston chamber (33); A flexible member (42) sleeved on the piston structure (4). The flexible member (42) includes at least one flexible sheet (422), and the flexible sheet (422) extends towards the inner wall of the piston cylinder (3) to contact the inner wall of the piston cylinder (3) circumferentially; A driving structure (5) connected to the piston structure (4) to drive the piston structure (4) to reciprocate within the piston cylinder (3).

2. The negative pressure massager according to claim 1, wherein, The flexible member (42) further includes a cylindrical portion (421) sleeved on the piston structure (4). Each flexible sheet (422) is sequentially arranged on the outer circumferential wall of the cylindrical portion (421) along the movement direction of the piston structure (4), and each flexible sheet (422) extends towards the inner wall of the piston cylinder (3) until it contacts the inner wall of the piston cylinder (3) circumferentially.

3. The negative pressure massager according to claim 2, characterized in that, The cylindrical portion (421) and each flexible sheet (422) are integrally provided.

4. The negative pressure massager according to claim 1, wherein The piston structure (4) includes a piston (41). The piston (41) has a base portion (411) and a plug-in portion (412) provided on the base portion (411). The plug-in portion (412) is rod-shaped, and the flexible member (42) is sleeved outside the plug-in portion (412). The base portion (411) is provided with a first abutting surface (4111) facing the flexible member (42), and the first abutting surface (4111) abuts against the bottom surface of the flexible member (42).

5. The negative pressure massager according to claim 4, wherein The piston structure (4) further includes a shielding member (43). The shielding member (43) has a top seat portion (431) and a connecting portion (432). The connecting portion (432) is inserted into and connected with the plug-in portion (412) to form a rod-shaped structure. The flexible member (42) is sleeved on the rod-shaped structure. The top seat portion (431) is provided with a second abutting surface (4311) facing the flexible member (42), and the second abutting surface (4311) abuts against the top surface of the flexible member (42).

6. The negative pressure massager according to claim 1, characterized in that, The driving structure (5) includes a driving motor (51), a connecting rod (53), and an eccentric member (52). The working end (511) of the driving motor (51) is connected to the connecting rod (53) through the eccentric member (52) to drive the connecting rod (53) to reciprocate. The connecting rod (53) is connected to the piston structure (4) to drive the piston structure (4) to move.

7. The negative pressure massager according to claim 6, characterized in that, The driving motor (51) is provided as a double-headed driving motor (51). The connecting rod (53) includes two crank arm portions (531) extending from the middle position of the double-headed driving motor (51) towards both ends, and an output end portion (532) provided at the middle position between the two crank arm portions (531). Each crank arm portion (531) is respectively connected to the two working ends (511) of the double-headed driving motor (51) through the eccentric member (52), and the output end portion (532) is connected to the piston structure (4).

8. The negative pressure massager according to claim 7, characterized in that, One end of the piston structure (4) connected to the driving structure (5) is provided with a pin seat (413). A pin shaft (54) is rotatably penetrated through the output end portion (532), and the pin shaft (54) is rotatably connected to the pin seat (413) so that the piston structure (4) and the output end portion (532) can rotate relative to each other.

9. The negative pressure massager according to claim 5, wherein, Further comprising: A housing (2) with an accommodation cavity (21) provided inside to accommodate the piston cylinder (3) and the driving structure (5). The housing (2) is provided with an accommodation hole (22). The opening of the first end (31) of the piston cylinder (3) is communicated with the accommodation hole (22). The shielding member (43) is accommodated in the accommodation hole (22) to shield the inside of the piston cylinder (3). A decorative housing (1) sleeved on the housing (2), and the decorative housing (1) is provided in a bionic shape.

10. The negative pressure massager according to claim 1, wherein, Further comprising a flexible waterproof film (34). The waterproof film (34) seals the opening of the second end (32) of the piston cylinder (3). The waterproof film (34) is provided with a sealing hole. The piston structure (4) passes through the sealing hole and is connected to the driving structure (5). A sealed connection is provided between the piston structure (4) and the sealing hole. The waterproof film (34) is fixedly connected to the piston structure (4) to move along with the piston structure (4); or, the waterproof film (34) is slidably connected to the piston structure (4) to enable the piston structure (4) to move relative to the waterproof film (34).

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