Miniature diaphragm air pump

Abstract

The invention discloses a miniature diaphragm air pump which comprises an upper cover, a valve seat, a piston seat, a base, a driving mechanism and at least one working system matched with the driving mechanism, and the upper cover is provided with an air inlet nozzle and an air outlet nozzle. Each working system comprises a first piston, a second piston, a first valve, a second valve and a third valve, the first piston and the second piston are installed on the piston seat, the first valve, the second valve and the third valve are installed on the valve seat, and the first piston is matched with the air inlet nozzle and provided with the first valve and the second valve which are opposite in direction. The second piston is matched with the air outlet nozzle and provided with a third valve in the same direction as the first valve. According to the miniature diaphragm air pump, air output by the air outlet nozzle is pressurized twice, the pressure of the output air is increased by more than one time compared with that of traditional air, the application range of a product is widened, the air pressure working efficiency is improved, applicability and practicability are high, and more and more complex use scenes and use requirements can be met.

Description

Technical Field

[0001] The invention belongs to the technical field of air pumps, and in particular relates to a micro diaphragm air pump. Background Art

[0002] Existing miniature diaphragm air pumps are widely used in industries such as healthcare, instrumentation, automotive, chemical, and scientific research, for applications such as pumping, inflating, vacuuming, pressurizing, gas circulation, and gas sampling. Conventional diaphragm air pumps typically utilize an eccentric drive mechanism driven by a motor drive shaft to pull or compress the diaphragm, changing the volume of the airbag formed by the valve seat and diaphragm. This is then combined with the movement of an inlet and outlet check valve to achieve air intake and exhaust.

[0003] As shown in patent document CN201747572U, existing micro-diaphragm air pumps generally provide a pair of valves for controlling the inlet and outlet of gas for each piston chamber (the air bag formed by the valve seat and the diaphragm). Due to this structure, the micro-diaphragm air pumps in the prior art have the following disadvantages:

[0004] 1. The gas enters from one piston chamber and is discharged from the other piston chamber. The gas is only compressed once during the transportation process, and the gas pressure output from the nozzle is generally low.

[0005] 2. The diaphragm is generally distributed on both sides of the eccentric wheel, which causes uneven force on the eccentric wheel when it rotates in a circle, resulting in a short service life, large vibration and loud noise during operation;

[0006] 3. There is only one set of working systems, and the gas flow of a single working system is output in a pulsed form, with poor continuity and stability. Summary of the Invention

[0007] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a micro diaphragm air pump, which effectively solves one of the problems in the prior art in the above background technology.

[0008] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a micro diaphragm air pump, comprising an upper cover, a valve seat, a piston seat, a base and a driving mechanism, wherein an air inlet nozzle and an air outlet nozzle are provided on the upper cover, and further comprising at least one group of working systems cooperating with the driving mechanism, each group of working systems comprising a first piston mounted on the piston seat, a second piston and a first valve component, a second valve component and a third valve component mounted on the valve seat, the first piston cooperating with the air inlet nozzle and being equipped with two first valve components and a second valve component in opposite directions, the second piston cooperating with the air outlet nozzle and being equipped with a third valve component in the same direction as the first valve component, under the action of the driving mechanism, the volume of the first piston changes, causing the first valve component to open, and gas enters the inner cavity of the first piston from the air inlet nozzle, the volume change of the first piston causes the first valve component to close and the second valve component to open, the gas is compressed by the first piston and transported from the inner cavity of the first piston to the inner cavity of the second piston, and then the volume of the second piston changes, driving the third valve component to open, and the gas is compressed again by the second piston and output from the air outlet nozzle.

[0009] Preferably, the micro diaphragm air pump also includes an air inlet cavity, an air outlet cavity and a connecting channel formed by the upper cover and the valve seat. The air inlet cavity is connected to the air inlet nozzle, the air outlet cavity is connected to the air outlet nozzle, and the connecting channel is connected to the inner cavity of the first piston and the inner cavity of the second piston respectively.

[0010] Preferably, a first mounting groove and a first air inlet hole are provided on the valve seat, the first air inlet hole is connected to the inner cavity of the first piston and the air inlet cavity respectively, the first valve component is installed in the first mounting groove and can open or block the first air inlet hole under the action of the first piston.

[0011] Preferably, a second mounting groove, a second air inlet and a first air outlet are provided on the valve seat, the first air outlet is respectively connected to the inner cavity and the connecting channel of the first piston, the second air inlet is respectively connected to the inner cavity and the connecting channel of the second piston, and the second valve component is installed in the second mounting groove and can open or block the first air outlet under the action of the first piston.

[0012] Preferably, a third mounting groove and a second air outlet are provided on the valve seat, the second air outlet is connected to the inner cavity and the air outlet cavity of the second piston respectively, the third valve component is installed in the third mounting groove and can open or block the second air outlet under the action of the second piston.

[0013] Preferably, the driving mechanism includes a driving member and a transmission assembly, the transmission assembly includes a transmission member, a transmission shaft and an eccentric wheel, the eccentric wheel is mounted on the driving end of the driving member, the transmission member is connected to the eccentric wheel through the transmission shaft, the transmission member cooperates with the first piston and the second piston of the working system, and can drive the first piston and the second piston to deform under the drive of the driving member.

[0014] Preferably, there are two groups of working systems, and the first pistons and the second pistons of the two groups of working systems are symmetrically arranged on the periphery of the transmission member.

[0015] Preferably, the transmission member includes a main body and a protrusion extending toward the periphery based on the main body, one end of the transmission shaft is mounted on the main body, and the other end is mounted on the eccentric wheel, a first rod-shaped portion is provided at the bottom of the first piston, and a second rod-shaped portion is provided at the bottom of the second piston, the protrusion is mounted on the periphery of the first rod-shaped portion or the second rod-shaped portion, and the number of the protrusions is equal to the sum of all the first rod-shaped portions and all the second rod-shaped portions.

[0016] Therefore, the present invention sets up two groups of symmetrically distributed working systems, including a total of four piston structures (2 first pistons and 2 second pistons). The four piston structures are evenly distributed in a circular array on the periphery of the transmission part. This uses the eccentric wheel and the transmission part of the driving mechanism to balance the force during work, reduce the loss of the eccentric wheel and the transmission part during work, and increase the service life; the four piston structures are evenly distributed in a circular array, and the force is balanced during work, which reduces vibration and noise; when the dual working system is in operation, the outlet flow rate is more continuous and stable than that of the single system flow.

[0017] Preferably, the inner wall of the air outlet nozzle is provided with a stepped silencer structure. Thus, a stepped silencer channel is formed inside the air outlet nozzle, which can effectively eliminate the whistling sound of the air outlet nozzle.

[0018] Preferably, the micro diaphragm air pump further comprises an elastic member, the valve seat, the piston seat and the base are fixedly connected, the upper cover is detachably connected to the valve seat, one end of the elastic member cooperates with the base, and the other end cooperates with the upper cover.

[0019] The beneficial effects of the present invention are:

[0020] 1. The gas output from the gas outlet nozzle of the present invention has been pressurized twice, and the output gas pressure is more than doubled compared with the traditional one, which broadens the application range of the product, increases the gas pressure working efficiency, has strong applicability and practicality, and can meet more and more complex usage scenarios and usage needs;

[0021] 2. Two symmetrically distributed working systems are set up, including four piston structures. The four piston structures are evenly distributed in a circular array on the periphery of the transmission part. This uses the eccentric wheel and transmission parts of the driving mechanism to balance the forces during operation, reducing the wear of the eccentric wheel and transmission parts during operation and increasing their service life;

[0022] 3. The four-piston structure is evenly distributed in a circular array, which ensures balanced force during operation and reduces vibration and noise;

[0023] 4. When the dual working system is working, the outlet flow rate is more continuous and stable than that of the single system;

[0024] 5. The air outlet is designed with a stepped silencer channel to eliminate the whistling sound of the air outlet and further reduce noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0026] In the attached figure:

[0027] Figure 1 Schematic diagram of the three-dimensional structure of the micro diaphragm air pump according to the first embodiment of the present invention;

[0028] Figure 2 for Figure 1 A schematic diagram of the three-dimensional structure of the micro diaphragm air pump shown in another angle;

[0029] Figure 3 for Figure 1 A schematic diagram of the top view of the micro diaphragm air pump shown;

[0030] Figure 4 for Figure 3 A schematic cross-sectional structure diagram of the micro diaphragm air pump shown in FIG.

[0031] Figure 5 for Figure 1 One of the exploded structural diagrams of the micro diaphragm air pump shown;

[0032] Figure 6 for Figure 1 The second schematic diagram of the explosion structure of the micro diaphragm air pump shown;

[0033] Figure 7 for Figure 3 Another cross-sectional schematic diagram of the micro-diaphragm air pump shown;

[0034] Figure 8 This is a schematic diagram of the three-dimensional structure of the valve seat of the present invention assembled with a portion of the piston;

[0035] Figure 9 This is one of the three-dimensional structural schematic diagrams of the valve seat of the present invention;

[0036] Figure 10 This is the second schematic diagram of the three-dimensional structure of the valve seat of the present invention;

[0037] Figure 11 Schematic diagram of the three-dimensional structure of the upper cover of the micro-diaphragm air pump according to the second embodiment of the present invention;

[0038] Figure 12 for Figure 11 Schematic diagram of the cross-sectional structure of the upper cover shown.

[0039] In the figure: 1-upper cover; 2-valve seat; 3-piston seat; 4-base; 5-driving mechanism; 6-working system; 7-air inlet nozzle; 8-air outlet nozzle; 9-elastic member; 10-air inlet chamber; 11-air outlet chamber; 12-connecting channel; 21-first mounting slot; 22-second mounting slot; 23-third mounting slot; 24-first air inlet hole; 25-second air inlet hole; 26-first air outlet hole; 27-second air outlet hole; 51-driving member; 52-transmission assembly; 61-first piston; 62-second piston; 63-first valve member; 64-second valve member; 65-third valve member; 81-stepped silencer structure; 521-transmission member; 522-transmission shaft; 523-eccentric wheel; 611-first rod-shaped portion; 621-second rod-shaped portion; 521a-body; 521b-protrusion. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only 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 ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0041] Embodiment 1, by Figures 1 to 10 The micro diaphragm air pump of this embodiment includes an upper cover 1, a valve seat 2, a piston seat 3, a base 4 and a driving mechanism 5. The upper cover 1 is provided with an air inlet nozzle 7 and an air outlet nozzle 8, and also includes at least one group of working systems 6 that cooperate with the driving mechanism 5. Each group of working systems 6 includes a first piston 61 mounted on the piston seat 3, a second piston 62, and a first valve member 63, a second valve member 64 and a third valve member 65 mounted on the valve seat 2. The first piston 61 cooperates with the air inlet nozzle 7 and is equipped with two first valve members 63 and a second valve member 64 in opposite directions. The second piston 62 cooperates with the air outlet nozzle 8 and is equipped with the first valve member 63 and the second valve member 64 in opposite directions. The third valve member 65 has the same direction as the first valve member 63. Under the action of the driving mechanism 5, the volume of the first piston 61 changes (volume expands) to open the first valve member 63, and the gas enters the inner cavity of the first piston 61 from the air inlet nozzle 7. The volume of the first piston 61 changes (volume decreases) to close the first valve member 63 and open the second valve member 64. The gas is compressed by the first piston 61 and then transported from the inner cavity of the first piston 61 to the inner cavity of the second piston 62. Then, the volume of the second piston 62 changes (volume decreases), driving the third valve member 65 to open. The gas is compressed again by the second piston 62 and then output from the air outlet nozzle 8.

[0042] As a further preference, the first valve component 63 , the second valve component 64 and the third valve component 65 of this embodiment are umbrella valves.

[0043] Preferably, the micro diaphragm air pump also includes an air inlet chamber 10, an air outlet chamber 11 and a connecting channel 12 formed by the upper cover 1 and the valve seat 2. The air inlet chamber 10 is connected to the air inlet nozzle 7, the air outlet chamber 11 is connected to the air outlet nozzle 8, and the connecting channel 12 is connected to the inner cavity of the first piston 61 and the inner cavity of the second piston 62 respectively.

[0044] Preferably, a first mounting groove 21 and a first air inlet hole 24 are provided on the valve seat 2. The first air inlet hole 24 is respectively connected to the inner cavity of the first piston 61 and the air inlet cavity 10. The first valve component 63 is installed in the first mounting groove 21 and can open or block the first air inlet hole 24 under the action of the first piston 61.

[0045] As a further preferred embodiment, there are multiple first air inlet holes 24 , wherein one first air inlet hole 24 is disposed at the center of the first mounting groove 21 , and the other multiple first air inlet holes 24 surround the periphery of the first air inlet hole 24 .

[0046] Preferably, a second mounting groove 22, a second air inlet 25 and a first air outlet 26 are provided on the valve seat 2. The first air outlet 26 is respectively connected to the inner cavity of the first piston 61 and the connecting channel 12. The second air inlet 25 is respectively connected to the inner cavity of the second piston 62 and the connecting channel 12. The second valve component 64 is installed in the second mounting groove 22 and can open or block the first air outlet 26 under the action of the first piston 61.

[0047] As a further preferred embodiment, there are multiple first air outlet holes 26 , wherein one first air outlet hole 26 is disposed at the center of the second mounting groove 22 , and the other multiple first air outlet holes 26 surround the periphery of the first air outlet hole 26 .

[0048] Preferably, a third mounting groove 23 and a second air outlet 27 are provided on the valve seat 2, and the second air outlet 27 is respectively connected to the inner cavity of the second piston 62 and the air outlet cavity 11. The third valve component 65 is installed in the third mounting groove 23 and can open or block the second air outlet 27 under the action of the second piston 62.

[0049] As a further preferred embodiment, there are multiple second air outlet holes 27 , wherein one second air outlet hole 27 is disposed at the center of the third mounting groove 23 , and the other multiple second air outlet holes 27 surround the outer periphery of the second air outlet hole 27 .

[0050] Preferably, the driving mechanism 5 includes a driving member 51 and a transmission assembly 52, the transmission assembly 52 includes a transmission member 521, a transmission shaft 522 and an eccentric wheel 523, the eccentric wheel 523 is mounted on the driving end of the driving member 51, the transmission member 521 is connected to the eccentric wheel 523 through the transmission shaft 522, the transmission member 521 cooperates with the first piston 61 and the second piston 62 of the working system 6, and can drive the first piston 61 and the second piston 62 to deform under the drive of the driving member 51.

[0051] As a further preference, the driving member 51 of this embodiment is a motor, and the transmission member 521 is designed to be cross-shaped.

[0052] Preferably, the working system 6 comprises two groups, with the first piston 61 and the second piston 62 of each group 6 symmetrically arranged on the outer periphery of the transmission member 521. The two first pistons 61 and the two second pistons 62 of the two groups 6 together form a four-piece diaphragm assembly. The piston portion of this four-piece diaphragm assembly is fitted onto the piston seat 3, and the upper end flange is compressed between the valve seat 2 and the piston seat 3.

[0053] Preferably, the transmission member 521 includes a main body 521a and a protrusion 521b extending toward the periphery based on the main body 521a, one end of the transmission shaft 522 is mounted on the main body 521a, and the other end is mounted on the eccentric wheel 523, a first rod-shaped portion 611 is provided at the bottom of the first piston 61, and a second rod-shaped portion 621 is provided at the bottom of the second piston 62, the protrusion 521b is mounted on the periphery of the first rod-shaped portion 611 or the second rod-shaped portion 621, and the number of the protrusions 521b is equal to the sum of all first rod-shaped portions 611 and all second rod-shaped portions 621.

[0054] Therefore, the present invention sets up two groups of symmetrically distributed working systems 6, which include a total of four piston structures (two first pistons 61 and two second pistons 62). The four piston structures are evenly distributed in a circular array on the periphery of the transmission member 521. This uses the eccentric wheel 523 and the transmission member 521 of the driving mechanism 5 to balance the forces during operation, reduce the loss of the eccentric wheel 523 and the transmission member 521 during operation, and increase the service life; the four piston structures are evenly distributed in a circular array, balance the forces during operation, and reduce vibration and noise; when the dual working system 6 is in operation, the outlet flow rate is more continuous and stable than that of the single system flow rate.

[0055] Preferably, the micro diaphragm air pump also includes an elastic member 9, the valve seat 2, the piston seat 3, and the base 4 are fixedly connected, the upper cover 1 and the valve seat 2 are detachably connected, one end of the elastic member 9 cooperates with the base 4, and the other end cooperates with the upper cover 1.

[0056] The outlet air pressure detection and comparison test was carried out using the micro diaphragm air pump in the prior art and the micro diaphragm air pump of the present invention. The test results are as follows: the outlet gas pressures of the micro diaphragm air pump in the prior art were measured to be 100KPa, 110KPa, 115KPa, 110KPa, and 100KPa, respectively, while the outlet gas pressures of the micro diaphragm air pump of the present invention were measured to be 200KPa, 215KPa, 220KPa, 215KPa, and 205KPa, respectively.

[0057] Example 2: Figures 11 to 12 It is shown that the structure of the micro diaphragm air pump of this embodiment is basically the same as that of the micro diaphragm air pump of the first embodiment, except that the air outlet nozzle 8 is different.

[0058] like Figure 11-12 As shown, the inner wall of the air outlet nozzle 8 of the micro diaphragm air pump of this embodiment is provided with a stepped silencer structure 81. Thus, a stepped silencer channel is formed inside the air outlet nozzle 8, which can effectively eliminate the whistling sound of the air nozzle.

[0059] The beneficial effects of the present invention are:

[0060] 1. The gas output from the gas outlet nozzle 8 of the present invention has been pressurized twice, and the output gas pressure is more than doubled compared with the traditional one, which broadens the application range of the product, increases the gas pressure working efficiency, has strong applicability and practicality, and can meet more and more complex usage scenarios and usage needs;

[0061] 2. Two symmetrically distributed working systems 6 are provided, comprising a total of four piston structures, which are evenly distributed in a circular array around the periphery of the transmission member 521. This ensures that the eccentric wheel 523 and the transmission member 521 of the driving mechanism 5 are subjected to balanced forces during operation, thereby reducing wear and tear on the eccentric wheel 523 and the transmission member 521 during operation and increasing their service life.

[0062] 3. The four-piston structure is evenly distributed in a circular array, which ensures balanced force during operation and reduces vibration and noise;

[0063] 4. When the dual working system 6 is working, the outlet flow rate is more continuous and stable than that of the single system;

[0064] 5. The air outlet nozzle 8 is designed with a stepped silencer channel to eliminate the whistling sound of the air nozzle and further reduce noise.

[0065] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0066] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A micro diaphragm air pump, comprising an upper cover (1), a valve seat (2), a piston seat (3), a base (4) and a driving mechanism (5), wherein the upper cover (1) is provided with an air inlet nozzle (7) and an air outlet nozzle (8), characterized in that: The invention also includes at least one set of working systems (6) matched with the driving mechanism (5), each set of the working systems (6) including a first piston (61) and a second piston (62) mounted on the piston seat (3), and a first valve member (63), a second valve member (64) and a third valve member (65) mounted on the valve seat (2), wherein the first piston (61) matches the air inlet nozzle (7) and is equipped with two first valve members (63) and two second valve members (64) in opposite directions, and the second piston (62) matches the air outlet nozzle (8) and is equipped with the third valve member (65) in the same direction as the first valve member (63); Under the action of the driving mechanism (5), the volume of the first piston (61) changes, causing the first valve member (63) to open, and gas to enter the inner cavity of the first piston (61) from the gas inlet nozzle (7). The volume change of the first piston (61) causes the first valve member (63) to close and the second valve member (64) to open. The gas is compressed by the first piston (61) and then transported from the inner cavity of the first piston (61) to the inner cavity of the second piston (62). Then, the volume of the second piston (62) changes, driving the third valve member (65) to open, and the gas is compressed again by the second piston (62) and then output from the gas outlet nozzle (8).

2. The micro diaphragm air pump according to claim 1, characterized in that: The valve body further comprises an air inlet chamber (10), an air outlet chamber (11) and a connecting channel (12) formed by the upper cover (1) and the valve seat (2); the air inlet chamber (10) is connected to the air inlet nozzle (7); the air outlet chamber (11) is connected to the air outlet nozzle (8); and the connecting channel (12) is connected to the inner chamber of the first piston (61) and the inner chamber of the second piston (62), respectively.

3. The micro diaphragm air pump according to claim 2, characterized in that: The valve seat (2) is provided with a first mounting groove (21) and a first air inlet hole (24), the first air inlet hole (24) being communicated with the inner cavity of the first piston (61) and the air inlet cavity (10) respectively, the first valve member (63) being mounted in the first mounting groove (21) and being capable of opening or blocking the first air inlet hole (24) under the action of the first piston (61).

4. The micro diaphragm air pump according to claim 3, characterized in that: The valve seat (2) is provided with a second mounting groove (22), a second air inlet hole (25) and a first air outlet hole (26); the first air outlet hole (26) is respectively communicated with the inner cavity of the first piston (61) and the connecting channel (12); the second air inlet hole (25) is respectively communicated with the inner cavity of the second piston (62) and the connecting channel (12); the second valve member (64) is mounted in the second mounting groove (22) and can open or block the first air outlet hole (26) under the action of the first piston (61).

5. The micro diaphragm air pump according to claim 4, characterized in that: The valve seat (2) is provided with a third mounting groove (23) and a second air outlet (27), the second air outlet (27) being communicated with the inner cavity of the second piston (62) and the air outlet cavity (11) respectively, and the third valve member (65) is mounted in the third mounting groove (23) and can open or block the second air outlet (27) under the action of the second piston (62).

6. The micro diaphragm air pump according to any one of claims 1 to 5, characterized in that: The driving mechanism (5) includes a driving member (51) and a transmission assembly (52), wherein the transmission assembly (52) includes a transmission member (521), a transmission shaft (522) and an eccentric wheel (523), wherein the eccentric wheel (523) is mounted on the driving end of the driving member (51), and the transmission member (521) is connected to the eccentric wheel (523) through the transmission shaft (522). The transmission member (521) cooperates with the first piston (61) and the second piston (62) of the working system (6), and can drive the first piston (61) and the second piston (62) to deform under the drive of the driving member (51).

7. The micro diaphragm air pump according to claim 6, characterized in that: The working system (6) is divided into two groups, and the first piston (61) and the second piston (62) of the two groups of the working system (6) are symmetrically arranged on the outer periphery of the transmission member (521).

8. The micro diaphragm air pump according to claim 7, characterized in that: The transmission member (521) includes a body (521a) and a protrusion (521b) extending toward the periphery based on the body (521a); ​​one end of the transmission shaft (522) is fitted on the body (521a), and the other end is fitted on the eccentric wheel (523); a first rod-shaped portion (611) is provided at the bottom of the first piston (61), and a second rod-shaped portion (621) is provided at the bottom of the second piston (62); the protrusion (521b) is fitted on the periphery of the first rod-shaped portion (611) or the second rod-shaped portion (621); and the number of the protrusions (521b) is equal to the sum of all the first rod-shaped portions (611) and all the second rod-shaped portions (621).

9. The micro diaphragm air pump according to any one of claims 1 to 5, characterized in that: The inner wall of the air outlet nozzle (8) is provided with a stepped silencer structure (81).

10. The micro diaphragm air pump according to any one of claims 1 to 5, characterized in that: It also includes an elastic member (9), the valve seat (2), the piston seat (3), and the base (4) are fixedly connected, the upper cover (1) and the valve seat (2) are detachably connected, one end of the elastic member (9) cooperates with the base (4), and the other end cooperates with the upper cover (1).

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