Pressure-bearing vacuum pipe all-in-one machine

Abstract

The invention discloses a pressure-bearing vacuum pipe all-in-one machine which comprises a support, a water tank, a base, a vacuum heat collecting pipe and a water conveying pipe, a water outlet pipe and a water inlet pipe are installed on the water tank, a water outlet pipe valve is arranged on the water outlet pipe, and the pressure-bearing vacuum pipe all-in-one machine further comprises a water inlet pipe valve installed on the water inlet pipe; the pressurizing mechanism is installed on the water inlet pipe and located between the water inlet pipe valve and the water tank, and the pressurizing mechanism is used for further pressurizing water in the inner cavity of the vacuum heat collecting pipe; the high-pressure drainage mechanism comprises a main pipe body communicated with the upper end of the vacuum heat collecting pipe, the tail end and the middle of the main pipe body are communicated with an air inlet pipe and a water spraying head respectively, a one-way valve is installed in the air inlet pipe, a first piston is arranged in the main pipe body, and a piston inner hole is formed in the first piston. The solar water heater can effectively avoid the problem that the water tank and the vacuum heat collecting pipes are filled with water, frozen and expanded to crack the water tank inner container and the vacuum heat collecting pipes.

Description

Technical Field

[0001] The invention belongs to the technical field of solar water heaters, and in particular relates to a pressure-bearing vacuum tube integrated machine. Background Art

[0002] The vacuum tube integrated machine, also known as the vacuum tube solar water heater, is a device that heats water through solar energy and stores the hot water in the system for supply.

[0003] Vacuum tube integrated machines can usually be divided into two types, pressure-bearing and non-pressure-bearing, according to the working pressure of the water tank. Non-pressure-bearing vacuum tube integrated machines refer to water tanks that cannot withstand the water pressure in the tap water pipes, and usually work by gravity flow, with the water flow driven by the height difference of the water tank. Therefore, the water tank is generally required to be installed at a higher position than the water use point, and the water flow relies on gravity. Pressure-bearing vacuum tube integrated machines refer to water heaters whose water tanks can withstand the tap water pressure in the pipes. Their water tanks are connected to the household tap water system, and the water inside the water tanks and vacuum tubes always maintains the same water pressure as the tap water system. When the water outlet tap is turned on, the water inlet pipe will simultaneously intake water to maintain the water pressure, thereby providing hot water stably without being affected by unstable water flow.

[0004] For the pressure-bearing vacuum tube integrated machine, in order to maintain the same water pressure as the household tap water system, its water tank and vacuum tube need to be kept full of water at all times; in some cold regions, when encountering rainy and snowy weather, not only can it not be heated by the sun, but the water in the water tank and vacuum tube will also freeze. The frozen water volume increases and easily cracks the water tank liner and vacuum tube, which in turn causes the equipment to be damaged and unusable. To solve the above problems, the present invention proposes a pressure-bearing vacuum tube integrated machine. Summary of the invention

[0005] The present invention aims at solving the problems in the prior art and proposes the following technical solutions:

[0006] The pressure-bearing vacuum tube integrated machine comprises a bracket, a water tank, a base, a vacuum heat collecting tube and a water supply pipe. The water tank is provided with a water outlet pipe and a water inlet pipe, and the water outlet pipe is provided with a water outlet pipe valve. The pressure-bearing vacuum tube integrated machine also comprises:

[0007] A water inlet pipe valve, wherein the water inlet pipe valve is installed on the water inlet pipe;

[0008] A booster mechanism, which is installed on the water inlet pipe and located between the water inlet pipe valve and the water tank, and is used to further boost the pressure of the water in the inner cavity of the vacuum collector tube;

[0009] A high-pressure drainage mechanism, the high-pressure drainage mechanism comprises a main body interconnected with the upper end of the vacuum heat collecting tube, the tail end and the middle of the main body are respectively interconnected with an air intake pipe and a water spray head, a one-way valve is installed inside the air intake pipe, a first piston is arranged inside the main body, and a piston inner hole is arranged inside the first piston;

[0010] After the water inlet pipe valve is closed, the boosting mechanism further pressurizes the water in the inner cavity of the vacuum collector tube. Under the action of pressure, the inner hole of the piston is connected to the water spray head and the water in the inner cavity of the vacuum collector tube is discharged at high pressure. External air enters the inner cavity of the vacuum collector tube from the one-way valve to supplement the high-pressure discharged water.

[0011] As a preferred embodiment of the above technical solution, the head end of the water spray head is inclined and faces the upper surface of the vacuum heat collecting tube.

[0012] As a preferred embodiment of the above technical solution, a reflector is installed on the bracket and the base, and the reflector is located below the vacuum collector tube.

[0013] As a preferred embodiment of the above technical solution, the periphery of the water supply pipe is covered with a sponge pad, the periphery of the sponge pad is provided with a frame sleeve, and the frame sleeve is fixedly connected to the upper surface of the reflective plate.

[0014] As a preferred embodiment of the above technical solution, the high-pressure drainage mechanism further includes a magnetic ring fixedly connected to the inner cavity of the main body and a magnetic plate movably arranged in the inner cavity of the main body, and a spring is fixedly connected between the magnetic plate and the inner wall of the top of the main body;

[0015] One end of the first piston away from the vacuum heat collecting tube is fixedly connected with a support column, and the support column passes through the magnetic ring and abuts against the magnetic plate.

[0016] As a preferred embodiment of the above technical solution, a first flat pressing hole is opened at the head end of the main pipe.

[0017] As a preferred embodiment of the above technical solution, the boosting mechanism includes an outer box body fixedly installed on the periphery of the water inlet pipe, a connecting pipe is fixedly installed inside the outer box body, and the head end of the connecting pipe is conical and connected to the water inlet pipe;

[0018] A second piston is arranged inside the connecting tube, and a driving assembly is arranged inside the outer box body, and the driving assembly is used for moving the second piston in the inner cavity of the connecting tube.

[0019] As a preferred embodiment of the above technical solution, the driving assembly includes a micro motor fixedly mounted on the inner wall of the outer box body, the output shaft of the micro motor is fixedly connected to a reciprocating screw, a screw sleeve is installed on the periphery of the reciprocating screw, one side of the screw sleeve is slidably connected to the inner wall of the outer box body, and the other side is fixedly connected to a connecting strip between the second piston.

[0020] As a preferred embodiment of the above technical solution, a second flattening hole is provided on the outer box body;

[0021] A connecting hole is formed on the outer wall of the connecting pipe, and the connecting strip movably passes through the connecting hole.

[0022] The beneficial effects of the present invention are:

[0023] 1. When the temperature is low and the weather conditions are bad, in order to prevent the water tank and the vacuum heat collecting tube from being full of water and freezing, and thus causing the water tank liner and the vacuum heat collecting tube to crack, the water inlet pipe valve is closed after the water inlet pipe is filled with water, and then the booster mechanism works to further boost the pressure of the water in the vacuum heat collecting tube cavity. Under the action of a greater water pressure, the first piston moves so that the piston inner hole is connected to the water spray head and the water in the vacuum heat collecting tube cavity is discharged at high pressure. Finally, the first piston returns to its initial position, and external air enters the vacuum heat collecting tube cavity from the one-way valve to supplement the high-pressure discharged water. At this time, since the water inlet pipe valves are all in a closed state, water cannot be supplied to the water tank, and at the same time, some air is rushed into the vacuum heat collecting tube cavity, thereby avoiding the problem of the water tank and the vacuum heat collecting tube being full of water and freezing, and thus causing the water tank liner and the vacuum heat collecting tube to crack.

[0024] 2. The head end of the water spray head in the present invention is tilted and faces the upper surface of the vacuum heat collecting tube. The booster mechanism works to further boost the pressure of the water in the vacuum heat collecting tube. Under the action of greater water pressure, the first piston moves so that the inner hole of the piston is connected to the water spray head and the water in the vacuum heat collecting tube is discharged at high pressure. The discharged water is sprayed at high pressure toward the upper surface of the vacuum heat collecting tube through the water spray head, which can clean the floating dust on the upper surface of the vacuum heat collecting tube and reduce the influence of the floating dust on the absorption of solar energy by the vacuum heat collecting tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 What is shown is a schematic diagram of the three-dimensional structure of the pressure-bearing vacuum tube integrated machine in the embodiment;

[0026] Figure 2 It shows Figure 1 Enlarged view of point A in the middle;

[0027] Figure 3 The diagram shows a partial schematic diagram of the connection between the main pipe body and the vacuum heat collecting pipe in the pressure-bearing vacuum pipe integrated machine in the embodiment;

[0028] Figure 4 The diagram shows a schematic diagram of the top view of the inner and outer boxes of the pressure-bearing vacuum tube integrated machine in the embodiment;

[0029] Figure 5 The figure shows the internal structure of the outer box of the pressure-bearing vacuum tube integrated machine in the embodiment under the pressure-boosting state of the pressure-bearing vacuum tube integrated machine;

[0030] Figure 6The figure shows the internal structure of the main body of the pressure-bearing vacuum tube integrated machine in the embodiment under the pressure-boosting state of the pressure-bearing vacuum tube integrated machine;

[0031] Figure 7 The figure shows the internal structure of the outer box of the pressurizing mechanism in the pressure-bearing vacuum tube integrated machine in the embodiment in the non-pressurized state;

[0032] Figure 8 What is shown is a schematic diagram of the internal structure of the main pipe body of the pressurizing mechanism in the pressure-bearing vacuum tube integrated machine in the embodiment in a non-pressurized state.

[0033] In the figure: 10, bracket; 11, water tank; 12, base; 13, vacuum collector tube; 14, water outlet pipe; 141, water outlet pipe valve; 15, water inlet pipe; 151, water inlet pipe valve; 16, water supply pipe; 161, sponge pad; 20, reflector; 21, frame sleeve; 30, high-pressure drainage mechanism; 31, main body; 32, air inlet pipe; 320, one-way valve; 33, sprinkler head; 34, first equalizing hole; 35, first piston; 351, piston inner hole; 36, support column; 37, magnetic ring; 38, magnetic plate; 39, spring; 40, booster mechanism; 41, outer box; 42, second equalizing hole; 43, connecting pipe; 44, second piston; 45, connecting strip; 46, micro motor; 47, reciprocating screw; 48, screw sleeve; 49, stabilizing plate. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0035] Example

[0036] like Figure 1 , Figure 2As shown, the pressure-bearing vacuum tube integrated machine includes a bracket 10, a water tank 11, a base 12, a vacuum heat collecting tube 13 and a water supply pipe 16. The water tank 11 is provided with a water outlet pipe 14 and a water inlet pipe 15, and the water outlet pipe 14 is provided with a water outlet pipe valve 141. The working principle of the pressure-bearing vacuum tube integrated machine during daily use is as follows: the hot water and cold water in the water tank 11 are usually layered, and this phenomenon is called temperature stratification; specifically, the temperature of hot water is higher, while the temperature of cold water is lower; the density of water is inversely proportional to the temperature: that is, the density of hot water is lower, while the density of cold water is higher; based on this physical property, hot water will naturally float on the top of the water tank 11, while cold water will settle at the bottom of the water tank. Cold water enters through the water inlet pipe 15 at the bottom of the water tank 11; thus, after entering the water tank 11, the cold water will naturally settle to the bottom of the water tank due to its high density, and will not directly mix with the heated hot water; the hot water will flow out through the water outlet pipe 14 at the top of the water tank 11. Since the hot water is located at the top of the water tank 11, when the user turns on the hot water tap, the first thing that flows out is the hot water, which ensures the stability of the water output and the ideal water temperature. During the solar heating process, the heat-absorbing coating on the inner wall of the vacuum heat collecting tube 13 absorbs sunlight to heat the water in the inner cavity of the vacuum heat collecting tube 13. The heated water floats up and is stored in the water tank 11, while the cold water at the bottom of the water tank 11 is collected from the lower end of the vacuum heat collecting tube 13 through the water supply pipe 16, thereby forming a complete circulation heating system.

[0037] The pressure-bearing vacuum tube integrated machine of the present invention further comprises:

[0038] A water inlet pipe valve 151, the water inlet pipe valve 151 is installed on the water inlet pipe 15;

[0039] A booster mechanism 40, which is installed on the water inlet pipe 15 and located between the water inlet pipe valve 151 and the water tank 11. The booster mechanism 40 is used to further boost the pressure of the water in the inner cavity of the vacuum heat collecting tube 13;

[0040] The high-pressure drainage mechanism 30 includes a main body 31 interconnected with the upper end of the vacuum heat collecting tube 13, the tail end and the middle of the main body 31 are interconnected with an air intake pipe 32 and a water spray head 33, a one-way valve 320 is installed inside the air intake pipe 32, a first piston 35 is arranged inside the main body 31, and a piston inner hole 351 is arranged inside the first piston 35;

[0041] The working principle of the present invention is as follows: when the temperature is low and the weather conditions are bad, in order to prevent the water tank 11 and the vacuum heat collecting tube 13 from being filled with water and freezing, the water inlet pipe valve 151 is closed first after the water inlet pipe 15 is filled with water, and then the booster mechanism 40 works to further boost the pressure of the water in the inner cavity of the vacuum heat collecting tube 13. Under the action of the greater water pressure, the first piston 35 moves so that the piston inner hole 351 and the water spray head 33 are connected and the water in the inner cavity of the vacuum heat collecting tube 13 is discharged at high pressure. Finally, the first piston 35 returns to its initial position, and external air enters the inner cavity of the vacuum heat collecting tube 13 from the one-way valve 320 to supplement the high-pressure discharged water. At this time, since the water inlet pipe valves 151 are all in a closed state, water cannot be supplied to the water tank 11, and at the same time, some air rushes into the inner cavity of the vacuum heat collecting tube 13, thereby avoiding the problem of the water tank 11 and the vacuum heat collecting tube 13 being filled with water and freezing, which causes the inner liner of the water tank 11 and the vacuum heat collecting tube 13 to crack. It should be noted here that when the weather improves and the equipment can be put into operation again, the water inlet pipe valve 151 is first opened to restore the water tank 11 and the vacuum heat collecting tube 13 to a full water state.

[0042] like Figure 3 As shown, the head end of the water spray head 33 is tilted and faces the upper surface of the vacuum heat collecting tube 13. The booster mechanism 40 works to further boost the pressure of the water in the inner cavity of the vacuum heat collecting tube 13. Under the action of greater water pressure, the first piston 35 moves so that the piston inner hole 351 is connected to the water spray head 33 and the water in the inner cavity of the vacuum heat collecting tube 13 is discharged at high pressure. The discharged water is sprayed at high pressure toward the upper surface of the vacuum heat collecting tube 13 through the water spray head 33, which can clean the floating dust on the upper surface of the vacuum heat collecting tube 13 and reduce the influence of the floating dust on the absorption of solar energy by the vacuum heat collecting tube 13. In actual application, the above operation can be repeated, thereby achieving a better cleaning effect on the floating dust on the upper surface of the vacuum heat collecting tube 13.

[0043] like Figure 1 , Figure 2 As shown, a reflector 20 is installed on the bracket 10 and the base 12, and the reflector 20 is located below the vacuum heat collecting tube 13. By setting the reflector 20, sunlight can be reflected to the vacuum heat collecting tube 13, further improving the utilization and absorption of solar energy by the vacuum heat collecting tube 13.

[0044] The outer periphery of the water supply pipe 16 is covered with a sponge pad 161 to provide thermal insulation and protection for the water supply pipe 16 . A frame sleeve 21 is provided on the outer periphery of the sponge pad 161 , and the frame sleeve 21 is fixedly connected to the upper surface of the reflector 20 . The frame sleeve 21 is used to assist in positioning and fixing the sponge pad 161 , thereby assisting in fixing the water supply pipe 16 .

[0045] like Figure 5-Figure 8As shown, the high-pressure drainage mechanism 30 also includes a magnetic ring 37 fixedly connected to the inner cavity of the main body 31 and a magnetic plate 38 movably arranged in the inner cavity of the main body 31; the end of the first piston 35 away from the vacuum collector tube 13 is fixedly connected to a support column 36, the support column 36 passes through the magnetic ring 37 and abuts against the magnetic plate 38, and a spring 39 is fixedly connected between the magnetic plate 38 and the top inner wall of the main body 31.

[0046] The boosting mechanism 40 includes an outer box body 41 fixedly installed on the periphery of the water inlet pipe 15, a connecting pipe 43 is fixedly installed inside the outer box body 41, the head end of the connecting pipe 43 is conical and connected to the water inlet pipe 15; a second piston 44 is arranged inside the connecting pipe 43, and a driving assembly is arranged inside the outer box body 41, and the driving assembly is used for moving the second piston 44 in the inner cavity of the connecting pipe 43.

[0047] In daily use, the pressure vacuum tube integrated machine Figure 8 As shown, at this time, the water in the inner cavity of the vacuum collector tube 13 and the tap water pipeline are in the same positive pressure state, and the external air cannot enter through the one-way valve 320; at this time, under the combined action of the magnetic ring 37, the magnetic plate 38 suction and the elastic pressure of the spring 39, the bottom end of the first piston 35 is squeezed against the outer wall of the inlet pipe 32 extending to the inner cavity of the main body 31, and the piston inner hole 351 and the water spray head 33 are staggered. When the boosting mechanism 40 is needed to boost the drainage, the water inlet pipe valve 151 is closed first, and then the working principle of the high-pressure drainage mechanism 30 and the boosting mechanism 40 is as follows: Figure 5 As shown, the driving assembly drives the second piston 44 to move toward the head end of the connecting pipe 43, squeezing the water in the inner cavity of the vacuum heat collecting tube 13, thereby pressurizing the water in the inner cavity of the vacuum heat collecting tube 13. When a certain pressure is reached, the combined force of the suction force of the magnetic ring 37, the magnetic plate 38 and the elastic pressure of the spring 39 is broken. Figure 6 As shown, the first piston 35 drives the support column 36 to lift the magnetic plate 38 so that the magnetic plate 38 and the magnetic ring 37 are separated, and the spring 39 is further compressed. At this time, the piston inner hole 351 is connected to the water spray head 33, and part of the water in the inner cavity of the vacuum heat collecting tube 13 is discharged from the water spray head 33 at high pressure through the piston inner hole 351; then the driving component in the booster mechanism 40 drives the second piston 44 to move to the initial position, that is, Figure 7 As shown, at this time, the interior of the main tube 31 is as shown in FIG. Figure 8 As shown, under the elastic action of the spring 39, the magnetic plate 38 is squeezed to restore the initial position and is attracted to the magnetic ring 37. Under the connection of the support column 36, the bottom end of the first piston 35 is driven to press against the outer wall of the inner cavity part of the air inlet pipe 32 extending to the main body 31 again. Since part of the water in the inner cavity of the vacuum heat collecting tube 13 is squeezed out and the second piston 44 gradually restores its initial position, negative pressure is formed in the inner cavity of the vacuum heat collecting tube 13, and external air enters from the one-way valve 320 to supplement the part of the high-pressure discharged water.

[0048] A first equalizing hole 34 is provided at the head end of the main body 31 ; the first equalizing hole 34 serves to balance the cavity between the magnetic plate 38 and the top inner wall of the main body 31 , thereby preventing positive and negative pressures from forming in the cavity and affecting the normal operation of the device.

[0049] The driving assembly includes a micro motor 46 fixedly mounted on the inner wall of the outer box body 41, the output shaft of the micro motor 46 is fixedly connected to a reciprocating screw 47, a screw sleeve 48 is installed on the periphery of the reciprocating screw 47, one side of the screw sleeve 48 is slidably connected to the inner wall of the outer box body 41, and the other side is fixedly connected to a connecting strip 45 between the second piston 44.

[0050] like Figure 4 As shown, a second equalizing hole 42 is provided on the outer box body 41; the second equalizing hole 42 is provided to balance the air pressure in the inner cavity of the outer box body 41, thereby preventing the formation of positive and negative pressures in the inner cavity of the outer box body 41 from affecting the normal operation of the equipment.

[0051] A connecting hole is formed on the outer wall of the connecting pipe 43, and the connecting strip 45 movably passes through the connecting hole. It should be noted that during the movement of the second piston 44 of the present invention, the head end of the connecting pipe 43 is always in a sealed state.

[0052] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

Claims

1. A pressure-bearing vacuum tube integrated machine, comprising a bracket (10), a water tank (11), a base (12), a vacuum heat collecting tube (13) and a water supply pipe (16), wherein a water outlet pipe (14) and a water inlet pipe (15) are installed on the water tank (11), and a water outlet pipe valve (141) is provided on the water outlet pipe (14), characterized in that: The pressure-bearing vacuum tube integrated machine also includes: A water inlet pipe valve (151), wherein the water inlet pipe valve (151) is installed on the water inlet pipe (15); A pressurizing mechanism (40), the pressurizing mechanism (40) being installed on the water inlet pipe (15) and located between the water inlet pipe valve (151) and the water tank (11), the pressurizing mechanism (40) being used to further pressurize the water in the inner cavity of the vacuum heat collecting tube (13); A high-pressure drainage mechanism (30), the high-pressure drainage mechanism (30) comprising a main pipe body (31) interconnected with the upper end of the vacuum heat collecting pipe (13), the tail end and the middle part of the main pipe body (31) are respectively interconnected with an air intake pipe (32) and a water spray head (33), a one-way valve (320) is installed inside the air intake pipe (32), a first piston (35) is arranged inside the main pipe body (31), and a piston inner hole (351) is arranged inside the first piston (35); After the water inlet pipe valve (151) is closed, the boosting mechanism (40) further boosts the pressure of the water in the inner cavity of the vacuum heat collecting tube (13). Under the action of pressure, the inner hole (351) of the piston and the water spray head (33) are connected and the water in the inner cavity of the vacuum heat collecting tube (13) is discharged at high pressure. External air enters the inner cavity of the vacuum heat collecting tube (13) from the one-way valve (320) to supplement the high-pressure discharged water.

2. The pressure-bearing vacuum tube integrated machine according to claim 1, characterized in that: The head end of the water spray head (33) is arranged obliquely and faces the upper surface of the vacuum heat collecting tube (13).

3. The pressure-bearing vacuum tube integrated machine according to claim 1, characterized in that: A reflector (20) is installed on the bracket (10) and the base (12), and the reflector (20) is located below the vacuum heat collection tube (13).

4. The pressure-bearing vacuum tube integrated machine according to claim 3, characterized in that: The periphery of the water supply pipe (16) is covered with a sponge sleeve pad (161), and the periphery of the sponge sleeve pad (161) is provided with a frame sleeve (21), and the frame sleeve (21) is fixedly connected to the upper surface of the reflective plate (20).

5. The pressure-bearing vacuum tube integrated machine according to claim 1, characterized in that: The high-pressure drainage mechanism (30) further comprises a magnetic ring (37) fixedly connected to the inner cavity of the main pipe (31) and a magnetic plate (38) movably arranged in the inner cavity of the main pipe (31); a spring (39) is fixedly connected between the magnetic plate (38) and the inner wall of the top of the main pipe (31); One end of the first piston (35) away from the vacuum heat collecting tube (13) is fixedly connected to a support column (36), and the support column (36) passes through the magnetic ring (37) and abuts against the magnetic plate (38).

6. The pressure-bearing vacuum tube integrated machine according to claim 5, characterized in that: A first flat pressing hole (34) is formed at the head end of the main pipe (31).

7. The pressure-bearing vacuum tube integrated machine according to claim 1, characterized in that: The boosting mechanism (40) comprises an outer box (41) fixedly mounted on the periphery of the water inlet pipe (15), a connecting pipe (43) fixedly mounted inside the outer box (41), the head end of the connecting pipe (43) being in a cone shape and being connected to the water inlet pipe (15); A second piston (44) is disposed inside the connecting tube (43), and a driving assembly is disposed inside the outer box (41), and the driving assembly is used to move the second piston (44) in the inner cavity of the connecting tube (43).

8. The pressure-bearing vacuum tube integrated machine according to claim 7, characterized in that: The driving assembly comprises a micro motor (46) fixedly mounted on the inner wall of the outer box body (41); the output shaft of the micro motor (46) is fixedly connected to a reciprocating screw (47); a screw sleeve (48) is mounted on the periphery of the reciprocating screw (47); one side of the screw sleeve (48) is slidably connected to the inner wall of the outer box body (41); and the other side of the screw sleeve (48) is fixedly connected to a connecting strip (45) between the second piston (44).

9. The pressure-bearing vacuum tube integrated machine according to claim 8, characterized in that: The outer box body (41) is provided with a second flat pressure hole (42); The outer wall of the connecting pipe (43) is provided with a connecting hole, and the connecting strip (45) movably passes through the connecting hole.

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