Negative pressure injection device

Abstract

The utility model relates to the technical field of injection, and provides a negative pressure injection device which has a liquid storage state and an initial state and comprises a first shell, a second shell, a thrust rod, a valve group and a locking assembly, the first shell is provided with a first force application body, and a fluid space is formed between the lower end of the first force application body and the first shell; the second shell is provided with a second force application body, and a negative pressure space is formed between the lower end of the second force application body and the second shell; the two ends of the thrust rod are an injection end and a locking end respectively, the middle of the thrust rod is connected with the second force application body, and the injection end is connected with the first force application body. After the thrust rod is unlocked, fluid injection can be automatically completed under the driving of atmospheric pressure, electric energy is not needed, and as the external atmospheric pressure is constant, thrust generated by the thrust rod is constant all the time in the injection process, and the injection stability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of injection, in particular to a negative pressure injection device. Background Art

[0002] A syringe is a common medical device used to extract or inject gases or liquids through a needle. This process is called an injection. A syringe consists of a barrel with a small hole at the front and a matching piston rod. It is used to inject or withdraw small amounts of liquid into or from otherwise inaccessible areas. When the piston rod is withdrawn, the liquid or gas is drawn in through the small hole at the front of the barrel, and when the piston rod is pushed in, the liquid or gas is expelled.

[0003] Existing injection devices are gradually realizing automatic injection, but some automatic injection devices are realized by electricity, which makes the structure complicated, and some use springs and rely on the spring force to realize injection. However, the spring force often has a large initial force, and the force decreases as the spring force is released, making the force of the entire injection process inconsistent, affecting the injection effect. Utility Model Content

[0004] In view of the defects in the prior art, the purpose of the present invention is to provide a negative pressure injection device.

[0005] According to the utility model, a negative pressure injection device is provided, which has a liquid storage state and an initial state, including:

[0006] A first housing is provided with a first force-applying body, a fluid space is formed between a lower end of the first force-applying body and the first housing, the fluid space extends to the outside of the first housing through a fluid pipeline, and a valve group is provided on the fluid pipeline;

[0007] The second shell is provided with a second force-applying body, and a negative pressure space is formed between the lower end of the second force-applying body and the second shell;

[0008] A thrust rod having an injection end and a locking end at both ends, passing through the second housing and connected to the second force-applying body at the middle, the injection end being connected to the first force-applying body, and the locking end being located outside the second housing;

[0009] In the initial state, the volume of the fluid space reaches its minimum; in the liquid storage state, the volume of the fluid space reaches its maximum, the locking end is locked by the locking assembly, and the thrust rod is not allowed to move. When the locking end is unlocked, the thrust rod drives the first force-applying body to squeeze the fluid space under the drive of the negative pressure in the negative pressure space, thereby causing the fluid in the fluid space to flow out through the fluid pipeline, wherein the conversion from the initial state to the liquid storage state is achieved by driving the thrust rod or by injecting the fluid into the fluid space through the fluid pipeline.

[0010] Preferably, a flexible capsule is provided in the fluid space, and the fluid is contained in the flexible capsule.

[0011] Preferably, the upper side of the flexible capsule is fixed on the first force-applying body, and the lower side of the flexible capsule is fixed on the inner wall of the first shell;

[0012] Alternatively, the first shell is a detachable structure, and the flexible capsule filled with fluid can be directly placed into the first shell for assembly.

[0013] Preferably, the locking assembly includes a locking support body, an elastic body and a blocking body, the locking end is provided with a cross bar, the thrust rod includes a vertical rod, and the locking assembly adopts any one of the following structures:

[0014] The locking support body has a sliding through hole and accommodating grooves arranged on both sides of the sliding through hole, and the elastic body and the blocking body are both arranged in the accommodating grooves; the vertical rod passes through the sliding through hole and the cross bar is located above the sliding through hole. When the device is in the initial state, the two ends of the cross bar are respectively pressed on the two blocking bodies, and the elastic body is in a compressed state. When the device is in the liquid storage state, the cross bar moves to the top of the blocking body and then, driven by the elastic restoring force of the elastic body, the two blocking bodies move closer and move to the bottom of the cross bar, thereby supporting and limiting the cross bar;

[0015] The locking assembly includes a locking support body, a functional body, and a blocking body. The locking support body has a sliding through hole. The vertical rod passes through the sliding through hole and the cross bar is located above the sliding through hole. When the device is in the initial state, the end of the cross bar presses against the blocking body. When the device is in the liquid storage state, the cross bar moves to the top of the blocking body and then, driven by the magnetic force of the functional body, the blocking body moves to the bottom of the cross bar to support and limit the cross bar.

[0016] The locking assembly comprises a limiting telescopic body fixed on the vertical rod and above the second force applying body, when the push rod moves upward, the two ends of the limiting telescopic body slide along the inner wall of the second shell, when the limiting telescopic body slides above the top end of the second shell, the limiting telescopic body is elongated and supported on the top edge of the second shell, thereby realizing the locking.

[0017] Preferably, the horizontal rod and the vertical rod are integrally connected, and the horizontal rod and the vertical rod have a weak connection structure at the connecting position or on the vertical rod, and the unlocking is realized by destroying the weak connection structure.

[0018] The horizontal rod and the vertical rod are detachably connected, and the unlocking is realized by detaching the horizontal rod from the vertical rod.

[0019] Preferably, the second shell and the second force applying body have magnetic attraction; and / or the horizontal rod and the second shell have magnetic attraction.

[0020] Preferably, a plurality of negative pressure spaces are arranged in the second shell and arranged circumferentially around the push rod, wherein the volumes of the plurality of negative pressure spaces are arranged as follows:

[0021] The cross-sectional shapes are completely the same;

[0022] The cross-sectional shapes are partially the same;

[0023] The cross-sectional shapes are all different.

[0024] Preferably, the first shell and the second shell are integrally connected; or the first shell and the second shell are detachable split structure.

[0025] Preferably, the valve group comprises a switch valve and an adjusting valve arranged in series; or the valve group comprises an adjusting valve.

[0026] Preferably, a buffer space is formed between the upper end of the first force applying body and the first shell, wherein:

[0027] The peripheral edge of the first force applying body is sealingly and slidably connected to the first shell, and the buffer space is in communication with the outside of the first shell; or

[0028] The peripheral edge of the first force applying body is gap-fitted to the first shell.

[0029] Compared with the prior art, the utility model has the beneficial effects that:

[0030] The utility model discloses a negative pressure space is set to store negative pressure energy, can be driven under the atmospheric pressure after the unlocking of push rod automatically complete fluid injection, need not electric energy, and due to the constant external atmospheric pressure, in the process of injection, the thrust of push rod is always constant force, when injecting to fluid flow, will not produce fluid reflux, increase the stability of injection, can obtain good injection effect. BRIEF DESCRIPTION OF DRAWINGS

[0031] Other features, objects and advantages of the utility model will become more apparent through reading the following detailed description of non-restrictive embodiments with reference to the accompanying drawings:

[0032] Figure 1 It is the structural schematic diagram of example 1, wherein, the device is in the liquid storage state;

[0033] Figure 2 It is the structural schematic diagram of example 1, wherein, the device is in the initial state;

[0034] Figure 3 It is the structural schematic diagram of example 3, wherein, the device is in the liquid storage state;

[0035] Figure 4 It is the structural schematic diagram of example 3, wherein, the device is between the initial state and the liquid storage state;

[0036] Figure 5 It is the structural schematic diagram of example 3, wherein, the device is in the initial state;

[0037] Figure 6 It is the structural schematic diagram of example 4, wherein, the device is between the initial state and the liquid storage state;

[0038] Figure 7 It is the structural schematic diagram of example 4, wherein, the device is in the liquid storage state;

[0039] Figure 8 It is the structural schematic diagram of push rod, wherein, the area of weak connection structure setting in the dotted line ring;

[0040] Figure 9 It is the structural schematic diagram when the weak connection structure is annular recess design;

[0041] Figure 10 It is the schematic diagram when push rod is designed as split structure and is screw thread cooperation structure;

[0042] Figure 11 It is the structural schematic diagram of example 7, wherein, push rod is locked;

[0043] Figure 12 It is the structural schematic diagram of example 7, wherein, push rod is unlocked;

[0044] Figure 13 is a top view schematic diagram of the structure of Example 3;

[0045] Figure 14 is a schematic diagram of the structure of Example 8;

[0046] Figure 15 is a schematic diagram of the structure of Example 9;

[0047] Figure 16 is a schematic diagram of the structure of Example 10, in which the first case and the second case are connected together;

[0048] Figure 17 is a schematic diagram of the structure of Example 10, in which the first case and the second case are separated;

[0049] Figure 18 is a schematic diagram of the structure of Example 10, in which a detachable assembly is shown;

[0050] Figure 19 is a schematic diagram of the structure of Example 11;

[0051] Figure 20 is a top view schematic diagram of the structure of Example 7, in which the thrust rod is locked;

[0052] Figure 21 is a top view schematic diagram of the structure of Example 7, in which the thrust rod is unlocked;

[0053] Figure 22 is a schematic diagram of the structure of Example 13, in which the limiting telescopic body is not locked;

[0054] Figure 23 is a schematic diagram of the structure of Example 13, in which the limiting telescopic body is unlocked.

[0055] shown in the figure are:

[0056] a first case 1

[0057] a fluid space 11

[0058] a first force applying body 111

[0059] a fluid pipe 112

[0060] a flexible bag body 113

[0061] a buffer space 12

[0062] a detachable assembly 13

[0063] a second case 2

[0064] a negative pressure space 21

[0065] Second force applying body 211

[0066] First permanent magnet 2111

[0067] Linkage 212

[0068] Second permanent magnet 22

[0069] Push rod 3

[0070] Cross bar 31

[0071] Vertical bar 32

[0072] Scale 321

[0073] Pull handle 33

[0074] Weak connection structure 34

[0075] Valve group 4

[0076] On-off valve 41

[0077] Adjusting valve 42

[0078] Locking assembly 5

[0079] Locking support body 51

[0080] Sliding through hole 511

[0081] Elastic body 52

[0082] Blocking body 53

[0083] Limiting telescopic body 54 DETAILED DESCRIPTION

[0084] The utility model will be described in detail below in combination with specific embodiments. The following embodiments will help the person skilled in the art to further understand the utility model, but do not limit the utility model in any form. It should be pointed out that, for those skilled in the art, without departing from the concept of the utility model, a number of changes and improvements can be made. These all belong to the protection scope of the utility model.

[0085] Example 1:

[0086] The utility model provides a negative pressure injection device, which has a liquid storage state and an initial state, and includes a first shell 1, a second shell 2, a thrust rod 3, a valve group 4 and a locking assembly 5. The first shell 1 and the second shell 2 are connected as a whole. A first force-applying body 111 is arranged on the first shell 1, and a buffer space 12 is formed between the upper end of the first force-applying body 111 and the first shell 1. The peripheral edge of the first force-applying body 111 is clearance-fitted with the first shell 1, and a fluid space 11 is formed between the lower end of the first force-applying body 111 and the first shell 1. A flexible capsule 113 is provided in the fluid space 11, and fluid is contained in the flexible capsule 113. The flexible capsule 113 is not connected to the first shell 1, but only has a contact connection relationship. The flexible capsule 113 extends to the outside of the first shell 2 through a fluid pipeline 112. A valve group 4 is provided on the fluid pipeline 112, that is, the fluid in the flexible capsule 113 flows out or flows in through the fluid pipeline 112, and the valve group 4 is used to control the on-off of the fluid pipeline 112. It should be noted that the first shell 1 is used to constrain the flexible capsule 113, so that the flexible capsule 113 is deformed in the fluid space 11. When the first force-applying body 111 moves downward, the first force-applying body 111 squeezes the flexible capsule 113 so that the fluid in the flexible capsule 113 flows out through the fluid pipeline 112. At this time, the volume of the buffer space 12 becomes larger, and the external atmosphere enters the buffer space 12 through a certain part of the first shell 1. When the first force-applying body 111 moves in a direction away from the flexible capsule 113, the volume of the buffer space 12 becomes smaller, and the atmosphere in the buffer space 12 flows out through a certain part of the first shell 1, so that the air pressure balance is maintained in the buffer space 12.

[0087] Furthermore, the second shell 2 is provided with a second force-applying body 211, and a negative pressure space 21 is formed between the lower end of the second force-applying body 211 and the second shell 2; the two ends of the thrust rod 3 are respectively an injection end and a locking end. The thrust rod 3 passes through the second shell 2 and is connected to the second force-applying body 211 in the middle. The thrust rod 3 and the second force-applying body 211 are rigidly connected and cannot move relative to each other. The injection end is connected to the first force-applying body 111, and the locking end is located outside the upper part of the second shell 2. In the initial state, as shown in FIG. Figure 2 As shown, the volume of the fluid space 11 reaches the minimum, the volume of the negative pressure space 21 reaches the minimum or there is still a part of the negative pressure space 21, and the fluid in the flexible bladder 113 is completely discharged or almost completely discharged. Figure 1As shown, the volume of the fluid space 11 reaches its maximum, and the volume of the negative pressure space 21 also reaches its maximum. The locking end is locked by the locking assembly 5, thereby preventing the thrust rod 3 from moving. When the locking end is unlocked, driven by the negative pressure in the negative pressure space 21, the external atmosphere pushes the second force-applying body 211 downward, thereby driving the thrust rod 3 to move downward synchronously. At this time, the thrust rod 3 drives the first force-applying body 111 to squeeze the flexible capsule 113 in the fluid space 11, thereby causing the fluid in the flexible capsule 113 to flow out through the fluid pipeline 112, completing the injection action. The present invention stores negative pressure energy in the negative pressure space 21, and after the thrust rod 3 is unlocked, it can automatically complete the fluid injection under the drive of atmospheric pressure without the need for electrical energy. Moreover, since the external atmospheric pressure is constant, during the injection process, a constant force always pushes the first force-applying body 111, thereby increasing the stability of the injection.

[0088] In this embodiment, the transition from the initial state to the liquid storage state can be achieved by pulling, rotating, or otherwise driving the thrust rod 3. This means that the thrust rod 3 is driven by an external force, causing the volume of the fluid space 11 to increase, and the external fluid is drawn into the flexible bladder 113 through the fluid conduit 112. In actual applications, the first housing 1 can be designed as a detachable structure, and the fluid-filled flexible bladder 113 can be directly placed into the first housing 1 for assembly.

[0089] The valve assembly 4 in this embodiment includes an on-off valve 41 and a regulating valve 42 arranged in series. The on-off valve 41 is used to control the on / off flow of the fluid line 112, while the regulating valve 42 can adjust the opening of the fluid line 112 to adjust the injection dosage. In actual applications, the valve assembly 4 can also omit the on-off valve 41 and only include the regulating valve 42, which can still achieve the effects of adjusting the opening and on / off control of the fluid line 112.

[0090] In this embodiment, a buffer space 12 is formed between the upper end of the first force-applying body 111 and the first shell 1, and a clearance fit is formed between the peripheral edge of the first force-applying body 111 and the first shell 1.

[0091] Example 2:

[0092] The difference between this embodiment and embodiment 1 is that the conversion from the initial state to the liquid storage state is achieved by applying pressure to the external fluid. The external pressure fluid is injected into the flexible capsule 113 through the fluid pipeline 112. The volume of the flexible capsule 113 expands and then pushes the first force-applying body 111 to drive the thrust rod 3 to move upward, thereby increasing the volume of the negative pressure space 21 to store negative pressure energy until the device is converted to the liquid storage state. At this time, the thrust rod 3 is locked by the locking assembly.

[0093] Example 3:

[0094] The embodiment is different from embodiment 1 in that a plurality of negative pressure spaces 21 are arranged in the second shell 2 along the circumference of the thrust rod 3, and each of the negative pressure spaces 21 is provided with a second force applying body 211, as shown in Figure 3 、 Figure 4 、 Figure 5 、 Figure 13 The plurality of second force applying bodies 211 are rigidly connected with the thrust rod 3 through a linkage 212, so that when the thrust rod 3 moves upward, the plurality of second force applying bodies 211 can be driven to move synchronously through the linkage 212 until the device is in the liquid storage state, as shown in Figure 3 When the thrust rod 3 moves downward, the plurality of second force applying bodies 211 can be driven to move synchronously through the linkage 212, and the device can be in the initial state, as shown in Figure 5 .

[0095] In actual application, the volumes of the plurality of negative pressure spaces 21 can be set in various forms, for example, the cross-sectional shapes are completely the same; for example, the cross-sectional shapes are partially the same; for example, the cross-sectional shapes are all different. Through different combinations of cross-sectional areas, appropriate negative pressure thrust can be set to meet the demand of injection speed.

[0096] Embodiment 4:

[0097] The embodiment is a preferred example of embodiment 1, which provides an implementation of the locking assembly 5, the locking assembly 5 comprising a locking support 51, an elastic body 52 and a blocking body 53, the locking support 51 having a sliding through hole 511 and containing grooves arranged on both sides of the sliding through hole 511, the elastic body 52 and the blocking body 53 being arranged in the containing grooves; the locking end is provided with a horizontal rod 31, and the thrust rod 3 further comprises a vertical rod 32, the vertical rod 32 and the horizontal rod 31 being connected perpendicularly, the vertical rod 32 penetrating through the sliding through hole 511, and the horizontal rod 31 being located above the sliding through hole 511, when the device is converted from the liquid storage state to the initial state, the two ends of the horizontal rod 31 are respectively pressed on the two blocking bodies 53, as shown in Figure 6 At this time, the elastic body 52 is in a compressed state. When the device is in the liquid storage state, the horizontal rod 31 moves above the blocking bodies 53, and the two blocking bodies 53 move close to each other and move directly below the horizontal rod 31 under the driving of the elastic recovery force of the elastic body 52, and the horizontal rod 31 is supported and limited, as shown in Figure 7 .

[0098] In the embodiment, the elastic body 52 is preferably a spring or an elastic capsule, etc. Because the spring is arranged and cooperates with the blocking body 53, when the horizontal rod 31 moves above the blocking body 53 in the process of upward movement of the horizontal rod 31, the blocking body 53 automatically enters below the horizontal rod 31 to lock the horizontal rod 31, which is simple and convenient to operate.

[0099] In this embodiment, when unlocking is required, the two blocking bodies 53 are pushed to move in opposite directions. When the distance between the two blocking bodies 53 is equal to or greater than the width of the cross bar 31, the blocking bodies 53 no longer block the cross bar 31, and the cross bar 31 is unlocked.

[0100] In this embodiment, for ease of operation, a handle 33 is provided on the horizontal bar 31. The push rod 3 can be conveniently pulled upward by manually pulling the handle 33. At the same time, for easier observation and increased intuitiveness of the injection volume, a scale 321 is provided on the vertical bar 32, allowing the user to easily monitor the injected or drawn-in dose at any time.

[0101] Example 5:

[0102] The difference between this embodiment and embodiment 4 is that the horizontal rod 31 and the vertical rod 32 are connected as one piece, and a weak connection structure 34 is provided at the portion where the horizontal rod 31 and the vertical rod 32 are connected or on the vertical rod 32. Figure 8 As shown, unlocking is achieved by destroying the weak connection structure 34. For example, the weak connection structure 34 is a thin neck structure with an annular concave design, so that the thin neck structure is thinner than other parts of the vertical rod 32, such as Figure 9 As shown, while meeting the tensile strength requirements, the weak link structure 34 can be easily broken by rotation, bending and torsion to achieve unlocking. In actual applications, the weak link structure 34 can also be designed as other structures, such as sheet-like or filament-like structures that meet both tensile strength and easy breakage requirements, and can be flexibly designed according to actual scenarios.

[0103] Example 6:

[0104] The difference between this embodiment and embodiment 5 is that the crossbar 31 and the vertical bar 32 are detachably connected, and unlocking is achieved by removing the crossbar 31 from the vertical bar 32. Figure 10 As shown, the upper end of the vertical rod 32 is set to two detachable parts, the upper end of the lower end part is provided with a threaded hole, and the lower end of the upper end part is provided with an external thread. Connection and separation can be achieved by tightening, and the unlocking effect can also be achieved.

[0105] Example 7:

[0106] The difference between this embodiment and embodiment 4 is that a blocking body 53 is provided on one side of the thrust rod 3, and the cross bar 31 only extends along the radial direction of the vertical rod 32 toward one side of the vertical rod 32 to achieve blocking and locking by the blocking body 53. Figure 11 、 Figure 20 As shown, through design, the blocking body 53 can be pushed horizontally to unlock or the blocking body 53 can be rotated to unlock, as shown in FIG. Figure 12 、 Figure 21 shown.

[0107] Example 8:

[0108] The difference between this embodiment and embodiment 3 is that there is a magnetic attraction between the second shell 2 and the second force-applying body 211; and / or there is a magnetic attraction between the cross bar 31 and the second shell 2, such as Figure 14 As shown, a second permanent magnet 22 is provided on the second shell 2, and a first permanent magnet 2111 is provided on the second force-applying body 211. The first permanent magnet 2111 and the second permanent magnet 22 are magnetically attracted to each other. By adding a structure of magnetic attraction, the second force-applying body 211 can be used to assist the movement of the second force-applying body 211 in the process of moving downward under the external atmospheric pressure. In actual applications, the second force-applying body 211 often does not have an ideal effect before moving to the lowest end. By adding a structure of auxiliary suction, an auxiliary compensation effect is played, solving the problem that the second force-applying body 211 is difficult to reach the lowest end in actual applications. At the same time, a pair of permanent magnets can be used between the crossbar 31 and the second shell 2 to achieve magnetic attraction, or suction assistance can be achieved by designing a structure that attracts magnetic materials.

[0109] Example 9:

[0110] The difference between this embodiment and embodiment 1 is that the upper side of the flexible capsule 113 is fixed on the first force-applying body 111, and the lower side of the flexible capsule 113 is fixed on the inner wall of the first shell 1. Figure 15 As shown, during injection or during the process of drawing fluid in, the flexible capsule 113 will not be deformed and affect the fluid holding problem. The flexible capsule 113 and the first shell 1 are in an inseparable integrated form. The device in this embodiment is disposable and cannot be reused.

[0111] Example 10:

[0112] The difference between this embodiment and embodiment 9 is that the first shell 1 and the second shell 2 are detachable separate structures, such as threaded connection, snap connection, magnetic attraction, etc. Figure 16 、 Figure 17 、 Figure 18 As shown, the top of the first force-applying body 111 is provided with an externally threaded column, and the lower end of the thrust rod 3 is provided with an internally threaded hole. By screwing the externally threaded column into the internally threaded hole, the first force-applying body 111 and the thrust rod 3 are stably connected. At the same time, the first housing 1 is detachably connected to the second housing 2 via a detachable component 13, which can adopt a threaded structure or a snap-fit ​​structure.

[0113] The structure in this embodiment can configure the first shell 1 as a disposable consumable, while the second shell 2 and other components can be configured as reusable components, which can greatly reduce the cost of use.

[0114] Example 11:

[0115] The embodiment is different from the embodiment 1, and a buffer space 12 is formed between the upper end of the first force applying body 111 and the first shell 1, and the circumferential edge of the first force applying body 111 is connected with the first shell 1 in a sealed sliding mode, as shown in the figure, and at this time, the first force applying body 111 is equivalent to a piston, the buffer space 12 is communicated with the outside of the first shell 1, that is, a channel is arranged on the top end surface of the first shell 1 and communicated with the outside, or the push rod 3 and the second shell 2 have a channel allowing the outside gas to pass, so that the pressure balance of the buffer space 12 is realized during the movement of the first force applying body 111. Figure 19 The embodiment is different from the embodiment 1, and a buffer space 12 is formed between the upper end of the first force applying body 111 and the first shell 1, and the circumferential edge of the first force applying body 111 is connected with the first shell 1 in a sealed sliding mode, as shown in the figure, and at this time, the first force applying body 111 is equivalent to a piston, the buffer space 12 is communicated with the outside of the first shell 1, that is, a channel is arranged on the top end surface of the first shell 1 and communicated with the outside, or the push rod 3 and the second shell 2 have a channel allowing the outside gas to pass, so that the pressure balance of the buffer space 12 is realized during the movement of the first force applying body 111.

[0116] In the embodiment, the inside of the fluid space 11 omits the flexible capsule 113, and directly stores the fluid through the fluid space 11, and the fluid space 11 is extended to the outside of the first shell 2 through the fluid pipeline 112, and is used for the outflow or filling of the fluid.

[0117] Embodiment 12:

[0118] The embodiment is different from the embodiment 4, and the locking assembly 5 comprises a locking support body 51, a functional body and a blocking body 53, the functional body is a permanent magnet, the movement of the blocking body 53 is driven by magnetic force, specifically, the functional body and the blocking body 53 can be all designed as permanent magnets and repel each other, the functional body is fixed, and the blocking body 53 is slidable to realize the driving of the blocking body 53; or the functional body is designed to be closer to the vertical rod 32, and the attraction of the functional body to the blocking body 53 is used to realize the movement of the blocking body 53 to the front of the horizontal rod 31 and then support and limit the horizontal rod 31.

[0119] Embodiment 13:

[0120] The embodiment is different from the embodiment 4, and the locking assembly 5 comprises a limiting telescopic body 54, the limiting telescopic body 54 is fixed on the vertical rod 32 and located above the second force applying body 211, when the push rod 3 moves upward, the two ends of the limiting telescopic body 54 slide along the inner wall of the second shell 2, as shown in the figure; when the limiting telescopic body 54 slides above the top end of the second shell 2, the limiting telescopic body 54 is elongated and then supported on the top edge of the second shell 2, so as to realize the locking, as shown in the figure. Figure 22 Figure 23 The embodiment is different from the embodiment 4, and the locking assembly 5 comprises a limiting telescopic body 54, the limiting telescopic body 54 is fixed on the vertical rod 32 and located above the second force applying body 211, when the push rod 3 moves upward, the two ends of the limiting telescopic body 54 slide along the inner wall of the second shell 2, as shown in the figure; when the limiting telescopic body 54 slides above the top end of the second shell 2, the limiting telescopic body 54 is elongated and then supported on the top edge of the second shell 2, so as to realize the locking, as shown in the figure.

[0121] For example, the operation principle of the utility model is as follows: Figure 15 , Figure 16 , Figure 17

[0122] ​​First, fill the flexible bag 113 with liquid, then close the switch valve 41 on the fluid line 112, at this time the liquid is sealed in the flexible bag 113; then pull the push rod 3 on the handle 33 until the push rod 3 is locked by the locking assembly, at this time the device is in the ready-to-trigger state.

[0123] Second, rotate the first shell 1 into the lower end of the second shell 2 to form a fixed connection following state, adjust the regulating valve 42 in the valve group 4 so that the fluid line 112 is at the appropriate opening size and is maintained. By means of pulling, rotating, opening or misalignment unlocking, the locking end of the push rod 3 is unlocked; at this time the push rod 3 is still in a static state under the action of the fluid pressure in the flexible bag 113.

[0124] Finally, open the switch valve 41 in the valve group 4, at this time the fluid in the flexible bag 113 is pushed by the push rod 3 and starts to be extruded from the fluid line 112, and at the same time the flow rate is controlled by the regulating valve 42, finally realizing the non-electric and stable and reliable fluid injection operation.

[0125] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0126] The specific embodiments of the present application have been described above. It should be understood that the present application is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essential content of the present application. In the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A negative pressure injection device, characterized in that: It has a storage state and an initial state, including: A first shell (1) is provided with a first force-applying body (111), a fluid space (11) is formed between the lower end of the first force-applying body (111) and the first shell (1), the fluid space (11) extends to the outside of the first shell (1) through a fluid pipeline (112), and a valve group (4) is provided on the fluid pipeline (112); The second shell (2) is provided with a second force-applying body (211), and a negative pressure space (21) is formed between the lower end of the second force-applying body (211) and the second shell (2); A thrust rod (3) having an injection end and a locking end at both ends, passing through the second shell (2) and having a middle portion connected to the second force-applying body (211), and the injection end is connected to the first force-applying body (111); In the initial state, the volume of the fluid space (11) reaches a minimum; in the liquid storage state, the volume of the fluid space (11) reaches a maximum, the locking end is locked by the locking assembly (5), and the thrust rod (3) is not allowed to move. When the locking end is unlocked, the thrust rod (3) drives the first force-applying body (111) to squeeze the fluid space (11) under the drive of the negative pressure in the negative pressure space (21), thereby causing the fluid in the fluid space (11) to flow out through the fluid pipeline (112), wherein the conversion from the initial state to the liquid storage state is achieved by driving the thrust rod (3) or by injecting the fluid into the fluid space (11) through the fluid pipeline (112).

2. The negative pressure injection device according to claim 1, characterized in that: A flexible capsule (113) is provided in the fluid space (11), and the fluid is contained in the flexible capsule (113).

3. The negative pressure injection device according to claim 2, characterized in that: The upper side of the flexible capsule (113) is fixed on the first force-applying body (111), and the lower side of the flexible capsule (113) is fixed on the inner wall of the first shell (1); Alternatively, the first shell (1) is a detachable structure, and the flexible capsule (113) filled with fluid can be directly placed into the first shell (1) to achieve assembly.

4. The negative pressure injection device according to claim 1, characterized in that: The locking end is provided with a transverse rod (31), the thrust rod (3) includes a vertical rod (32), and the locking assembly (5) adopts any one of the following structures: The locking assembly (5) comprises a locking support body (51), an elastic body (52) and a blocking body (53), wherein the locking support body (51) has a sliding through hole (511) and a receiving groove arranged on both sides of the sliding through hole (511), and the elastic body (52) and the blocking body (53) are both arranged in the receiving groove; the vertical rod (32) passes through the sliding through hole (511) and the cross rod (31) is located above the sliding through hole (511); when the device is in the initial state, the two ends of the cross rod (31) respectively press on the two blocking bodies (53), and at this time, the elastic body (52) is in a compressed state; when the device is in the liquid storage state, the cross rod (31) moves to the top of the blocking body (53) and then, driven by the elastic restoring force of the elastic body (52), the two blocking bodies (53) move closer and move to the bottom of the cross rod (31) to support and limit the cross rod (31); The locking assembly (5) comprises a locking support body (51), a functional body and a blocking body (53); the locking support body (51) has a sliding through hole (511); the vertical rod (32) passes through the sliding through hole (511) and the cross rod (31) is located above the sliding through hole (511); when the device is in the initial state, the end of the cross rod (31) presses on the blocking body (53); when the device is in the liquid storage state, the cross rod (31) moves to the top of the blocking body (53) and then, driven by the magnetic force of the functional body, the blocking body (53) moves to the bottom of the cross rod (31) to support and limit the cross rod (31); The locking assembly (5) includes a limiting telescopic body (54), which is fixed on the vertical rod (32) and located above the second force-applying body (211). When the thrust rod (3) moves upward, both ends of the limiting telescopic body (54) slide along the inner wall of the second shell (2). When the limiting telescopic body (54) slides above the top of the second shell (2), the limiting telescopic body (54) extends and supports the top edge of the second shell (2) to achieve locking.

5. The negative pressure injection device according to claim 4, characterized in that: The crossbar (31) and the vertical bar (32) are integrally connected and a weak connection structure (34) is provided at the portion where the crossbar (31) and the vertical bar (32) are connected or on the vertical bar (32), and the unlocking is achieved by destroying the weak connection structure (34); or The cross bar (31) and the vertical bar (32) are detachably connected, and the unlocking is achieved by removing the cross bar (31) from the vertical bar (32).

6. The negative pressure injection device according to claim 4, characterized in that: There is a magnetic attraction between the second shell (2) and the second force-applying body (211); and / or there is a magnetic attraction between the crossbar (31) and the second shell (2).

7. The negative pressure injection device according to claim 1, characterized in that: The second shell (2) is provided with a plurality of negative pressure spaces (21) arranged along the circumference of the thrust rod (3), wherein the volumes of the plurality of negative pressure spaces (21) have any of the following settings: The cross-sectional shapes are exactly the same; The cross-sectional shapes are partially the same; The cross-sectional shapes are all different.

8. The negative pressure injection device according to claim 1, characterized in that: The first shell (1) and the second shell (2) are connected as one piece; or the first shell (1) and the second shell (2) are detachable separate structures.

9. The negative pressure injection device according to claim 1, characterized in that: The valve group (4) includes an on-off valve (41) and a regulating valve (42) arranged in series; or the valve group (4) includes the regulating valve (42).

10. The negative pressure injection device according to claim 1, characterized in that: A buffer space (12) is formed between the upper end of the first force-applying body (111) and the first shell (1), wherein: The peripheral edge of the first force-applying body (111) is sealed and slidably connected to the first shell (1), and the buffer space (12) is connected to the outside of the first shell (1); or There is a clearance fit between the peripheral edge of the first force-applying body (111) and the first shell (1).

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