A needle shaft and a syringe needle

Abstract

This utility model relates to the field of meat processing technology. It provides a needle shaft and an injection needle for connection with a needle tube to form an injection needle. The needle shaft has a transmission toothed portion configured to be connected to a drive device, enabling the drive device to rotate the needle shaft via the transmission toothed portion, thereby rotating the injection needle. During insertion, dwell, and withdrawal, the injection needle continuously rotates. For example, starch particles and spice powders in high-concentration injection solutions will be evenly dispersed in the liquid under centrifugal force, preventing deposition on the inner wall of the needle tube or at the needle hole due to gravity or flow rate differences. Simultaneously, centrifugal force also assists particles in smoothly passing through the needle hole with the liquid flow, preventing jamming and accumulation, reducing the solidification of high-viscosity liquid residues, avoiding localized solidification due to stillness, reducing the risk of blockage caused by residues, and reducing the frequency of downtime for cleaning.

Description

Technical Field

[0001] The embodiments of this utility model relate to the field of meat processing technology, specifically to a needle shaft and an injection needle. Background Technology

[0002] In the meat processing industry, to improve the tenderness, flavor stability, and water retention of meat products, raw meat such as chicken breast, beef chunks, and pork rolls needs to undergo injection pretreatment. In specific scenarios, the processed products cover meat products of different textures, such as beef with high fascia content and chicken with fine fibers. The injection solution type is divided into high-concentration marinade, containing starch, protein particles, spice extracts, medium and low concentration brine, or emulsion, depending on the process requirements. The production process must meet the requirements of continuous operation. The injection needle needs to be inserted into the stacked meat products in batches at a frequency of 10-30 times per minute to ensure that the injection solution penetrates evenly into the meat, avoiding localized over-drying or over-salting, and ultimately ensuring the consistency of the taste and the pass rate of the finished meat.

[0003] The traditional injection needles widely used in the industry today move vertically up and down by a cylinder or motor-driven frame. In actual meat processing scenarios, this is difficult to adapt to the needs of different concentrations of injection solutions. Different concentrations of injection solutions can easily clog the injection hole, leading to production interruptions and reduced efficiency. For example, for high-concentration injection solutions (such as marinades containing 20%-30% starch granules and 5%-10% spice powder), when the injection needle moves up and down, the meat fibers inside the meat will be pulled out with the needle and adhere to the surface of the injection hole. They mix with the particles in the high-concentration injection solution to form a dense blockage, causing the injection hole to become clogged.

[0004] For medium- and low-concentration, high-viscosity injection solutions (such as those containing emulsified fat), under constant supply pressure, the flow resistance of the injection solution within the narrow injection orifice is high. If the rise and fall speed is too fast, the flow is easily interrupted, and some injection solution remains in the syringe, solidifying and exacerbating blockage. In addition, the flowability of injection solutions of different concentrations varies greatly, with high-concentration injection solutions flowing slowly and low-concentration injection solutions flowing quickly. However, with the constant supply pressure in traditional methods, when injecting high-concentration injection solutions, the injection orifice near the base of the syringe produces a large volume of solution, while the injection orifice at the end produces a small volume. The opposite is true when injecting low-concentration injection solutions, further aggravating the concentration differences in different parts of the meat product. Utility Model Content

[0005] To overcome the above-mentioned defects, this utility model provides a needle shaft and an injection needle, which solves the technical problem that the traditional injection needle in the prior art only drives the fixed frame to move the injection needle vertically up and down by a cylinder or motor, which easily leads to the blockage of the injection hole and the increase of concentration deviation in different parts of the meat.

[0006] According to one aspect, at least one embodiment of the present invention provides a needle shaft for connection with a needle tube to form an injection needle. The needle shaft has a transmission tooth portion configured to be driveably connected to a drive device so that the drive device can drive the needle shaft to rotate via the transmission tooth portion, thereby driving the injection needle to rotate.

[0007] For example, at least one embodiment of the present invention provides a needle shaft having a flow channel for the flow of injection liquid and a mounting hole communicating with the flow channel. The mounting hole is used to mount the end of the needle tube. The mounting hole is coaxially arranged with the flow channel and located below the flow channel. The diameter of the mounting hole is larger than the diameter of the flow channel.

[0008] For example, at least one embodiment of the present invention provides a needle shaft in which a plurality of liquid inlet holes are radially provided through the upper sidewall of the flow channel. The plurality of liquid inlet holes are arranged at intervals along the height direction. The needle shaft is configured such that the liquid inlet holes are used to introduce injection liquid into the flow channel, and the flow channel is used to guide the injection liquid to the mounting hole.

[0009] For example, at least one embodiment of the present invention provides a needle shaft in which a plurality of liquid inlet holes are arranged at intervals along the height direction and at intervals along the circumference of the needle shaft. The plurality of liquid inlet holes are configured such that the orientation of any liquid inlet hole does not overlap with that of other liquid inlet holes.

[0010] According to another aspect, at least one embodiment of the present invention also provides an injection needle, including a needle shaft and a needle tube, the needle tube being disposed in a mounting hole, the tube being connected to a flow channel, and the diameter of the tube being greater than or equal to the diameter of the flow channel.

[0011] For example, in at least one embodiment of the present invention, an injection needle has an annular inner abutment portion on the inner wall of the end of the mounting hole away from the flow channel. The inner abutment portion extends obliquely from the outside to the inside towards the side closer to the flow channel and its diameter gradually decreases. The injection needle also includes: A sleeve has a first abutment for abutting with an inner abutment and a tube hole for the needle to pass through; the sleeve is used to fit over the needle. A ferrule is used to fit over a syringe, tube sleeve, or needle shaft.

[0012] For example, in at least one embodiment of the present invention, the injection needle further includes a second abutment portion, with the first and second abutment portions located at opposite axial ends of the tube sleeve. The second set of abutments is sloping, and the sleeve has a first snap-fit ​​portion for abutting against the second set of abutments.

[0013] For example, in an injection needle provided in at least one embodiment of the present invention, the outer wall of the end of the mounting hole away from the flow channel also has an annular outer abutment portion, which extends obliquely from the outside to the inside toward the side closer to the flow channel and the diameter gradually increases. The sleeve has a second engaging portion for abutting against the outer engaging portion.

[0014] For example, in an injection needle provided by at least one embodiment of the present invention, there is a horizontal transition portion between the outer abutment portion and the inner abutment portion, and the ferrule has a third snap-fit ​​portion for abutting against the horizontal transition portion.

[0015] For example, in an injection needle provided by at least one embodiment of the present invention, the tube sleeve is flexible, and the two ends of the tube hole have contraction portions, which extend obliquely from the inside to the outside towards the side close to the axis of the tube hole.

[0016] The beneficial effects of the embodiments of this utility model are as follows: In this invention, the injection needle continuously rotates during insertion, stay, and withdrawal. Under centrifugal force, starch particles and spice powders in high-concentration injection solutions will be evenly dispersed in the liquid, preventing them from depositing on the inner wall of the needle tube or at the needle hole due to gravity or flow rate differences. At the same time, centrifugal force can also help the particles pass smoothly through the needle hole with the liquid flow, without jamming or accumulating, reducing the solidification of high-viscosity liquid residue, avoiding local solidification caused by stillness, reducing the risk of blockage caused by residue, and reducing the frequency of downtime for cleaning. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this utility model and these drawings without any creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of an injection needle in one embodiment of the present invention; Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of AA; Figure 3 This is a schematic diagram of the structure of a card holder in one embodiment of the present invention; Figure 4 for Figure 3 A cross-sectional view of a type of card sleeve; Figure 5 This is a schematic diagram of the structure of a sleeve in one embodiment of the present invention; Figure 6 for Figure 5 A cross-sectional view of a type of pipe sleeve; Figure 7 for Figure 1 A schematic cross-sectional view of the needle shaft in the embodiment; Figure 8 for Figure 7A magnified view of part B in the diagram.

[0019] In the diagram: 100, injection needle; 110, needle shaft; 111, transmission gear; 112, flow channel; 113, mounting hole; 114, liquid inlet; 115, inner abutment; 116, outer abutment; 117, horizontal transition; 120, needle tube; 130, tube sleeve; 131, tube hole; 132, first abutment; 133, second abutment; 134, contraction section; 140, clamping sleeve; 141, first locking part; 142, second locking part; 143, third locking part; 144, first locking space; 145, second locking space; 146, third locking space. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit its scope.

[0021] To keep the drawings concise, only the parts relevant to the utility model are shown schematically in each drawing; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "a" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0022] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0024] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] like Figures 7-8 As shown, this invention illustrates a needle shaft 110 in one embodiment, applied in the field of meat processing. It is primarily used in conjunction with a needle tube 120 to form an injection needle 100, assisting the injection needle 100 in injecting meat products with injection solutions such as marinating agents and brine, ensuring effective penetration of the injection solution into the meat product. This addresses the problems of traditional injection needles 100, such as easy clogging, poor compatibility with different concentrations of injection solutions, and uneven meat injection. In this embodiment, the top of the needle shaft 110 is provided with a transmission gear 111, specifically designed as a gear structure with 5 teeth. The number of teeth can be customized according to actual needs and is not limited here. As one embodiment, the drive device can adopt a chain drive form, including a chain, a power output wheel, and a motor power source. The transmission teeth 111 of the needle shaft 110 are engaged with the chain of the drive device. The chain is wrapped around the power output wheel of the drive device and the transmission teeth 111 of the needle shaft 110. The power transmission is achieved by the interlocking of the tooth grooves of the chain and the teeth of the transmission teeth 111 (that is, the pitch of the chain matches the tooth spacing of the transmission teeth 111). This connection method can ensure the stability of power during the transmission process and avoid slippage or misalignment.

[0027] Furthermore, such as Figure 7As shown, the needle shaft 110 includes a flow channel 112, a mounting hole 113, and a liquid inlet hole 114. The flow channel 112 is arranged axially, and multiple liquid inlets 114 are provided. In this embodiment, four liquid inlets 114 are provided, spaced apart along the height direction, radially penetrating the sidewall of the flow channel 112, and spaced apart circumferentially along the needle shaft 110. Specifically, the height distance between adjacent liquid inlets 114 is greater than the diameter of the liquid inlet hole 114, the circumferential angle is ninety degrees, and the orientations of the liquid inlets 114 do not overlap. This arrangement allows the injection solution to flow in from four independent radial directions on the sidewall of the flow channel 112, avoiding mutual impact between the liquid flows from different inlet holes 114. This is especially beneficial for high-concentration injection solutions (such as pickling preparations containing 20%-30% starch granules and 5%-10% spice powder). If the liquid flows impact each other, turbulence or eddies can easily form, causing particles to accumulate at the impact point and adhere to the wall of the flow channel 112. With the current arrangement, the liquid flow is in a stable confluence state, and the particles can flow smoothly downwards with the liquid flow, reducing the risk of particle deposition caused by impact.

[0028] In traditional methods, uneven liquid distribution can easily lead to localized high and low pressure within the flow channel 112, ultimately resulting in varying liquid output at different locations in the syringe 120. However, in the current arrangement, the injection liquid flows downwards along the axial direction of the flow channel 112 at a stable pressure. Combined with the rotation of the syringe 120 driven by the needle shaft 110, this allows for a more uniform pressure distribution of the injection liquid within the syringe 120. This alleviates the problem of excessive liquid output at the root when injecting high concentrations and at the tip when injecting low concentrations, as is common with traditional injection needles 100. This ensures consistent liquid penetration across different parts of the meat product, preventing localized areas from becoming too salty or too dry.

[0029] In the vertical direction, the spacing between adjacent inlet holes 114 is greater than the diameter of the inlet hole 114, allowing the injection fluid to enter from different height positions in the flow channel 112, rather than a single horizontal layer. This three-dimensional inlet design allows the liquid to quickly and fully fill the entire cross-section of the flow channel 112, especially the upper and middle regions of the flow channel 112, avoiding the problems of empty space at the top and liquid accumulation at the bottom of the flow channel 112 that are common with traditional single-layer inlet design. For medium-to-low concentration, high-viscosity injection fluids (such as injection fluids containing emulsified fats), this uniform distribution reduces the local residence time of the liquid in the flow channel 112, lowers the risk of viscosity increase or local solidification due to prolonged standing, and further ensures the continuity of the liquid flow.

[0030] Furthermore, this arrangement is well-suited for injection solutions of different concentrations and viscosities: for high-concentration injection solutions containing particles, it reduces the probability of particles clogging the inlet hole 114 or flow channel 112 by avoiding impact and deposition; for medium- and low-concentration, high-viscosity injection solutions, it ensures smooth flow by reducing retention and stabilizing pressure; there is no need to frequently adjust the inlet structure for different injection solutions, only the rotation speed needs to be adjusted in conjunction with the drive device to meet the process requirements, which improves the versatility of the device in meat processing scenarios and reduces the adjustment cost and time cost when changing production.

[0031] In this embodiment, the injection needle 100 continuously rotates during insertion, stay, and withdrawal. Under the action of centrifugal force, starch particles and spice powders in high-concentration injection solutions will be evenly dispersed in the liquid, avoiding deposition on the inner wall of the needle tube 120 or at the needle hole due to gravity or flow rate differences. At the same time, centrifugal force can also help particles pass smoothly through the needle hole with the liquid flow without jamming or accumulating, reducing the solidification of high-viscosity liquid residues, avoiding local solidification caused by stillness, reducing the risk of blockage caused by residues, and reducing the frequency of downtime for cleaning.

[0032] like Figure 1 and Figure 2 As shown, this invention illustrates an injection needle 100 in another embodiment, comprising a needle shaft 110, a needle tube 120, a sleeve 130, and a retainer 140. A flexible compression connection structure between the sleeve 130 and the retainer 140 replaces the traditional threaded connection, enabling rapid and stable assembly of the needle tube 120 and the needle shaft 110. It retains the core function of the needle shaft 110 driving the needle tube 120 to rotate, while the abutment and compression design enhances the sealing and stability of the needle tube 120, adapting to the characteristics of the flexible needle tube 120 and further improving the injection effect of different types of injection solutions, such as high-concentration, medium-low concentration, and high-viscosity solutions, ensuring the continuity and uniformity of meat processing.

[0033] Specifically, the needle shaft 110 includes a flow channel 112, a mounting hole 113, an inner abutment portion 115, an outer abutment portion 116, and a horizontal transition portion 117. The flow channel 112 allows the injection solution to flow through, and the mounting hole 113 is used to accommodate the end of the needle tube 120. The inner abutment portion 115 is an annular structure on the inner wall of the end of the mounting hole 113 away from the flow channel 112, extending obliquely from the outside to the inside towards the side closer to the flow channel 112, with its diameter gradually decreasing. The outer abutment portion 116 is an annular structure on the outer wall of the end of the mounting hole 113 away from the flow channel 112, extending obliquely from the outside to the inside towards the side closer to the flow channel 112, with its diameter gradually increasing. The horizontal transition portion 117 is located between the outer abutment portion 116 and the inner abutment portion 115 and is horizontal.

[0034] like Figure 5 and Figure 6As shown, the sleeve 130 is made of flexible material and has a central hole 131 through which the rigid needle tube 120 passes. The two ends of the hole 131 have contraction portions 134. The contraction portions 134 extend obliquely from the inside to the outside towards the side close to the axis of the hole 131, that is, they gradually tighten from the inside of the sleeve 130 towards the openings at both ends, forming a hole 131 structure that is narrow at both ends and wide in the middle, which is adapted to fit and seal against the outer wall of the rigid needle tube 120. The two ends of the sleeve 130 also have a first set of abutment portions 132 and a second set of abutment portions 133 respectively. The first set of abutment portions 132 is adapted to fit and abut against the inner abutment portion 115 of the needle shaft 110. The second set of abutment portions 133 has the same shape as the first set of abutment portions 132, which is sloped, and is used to abut against the first snap-fit ​​portion 141 of the ferrule 140.

[0035] like Figure 3 and Figure 4 As shown, the ferrule 140 is made of flexible material and is used to fit onto the rigid needle tube 120, the flexible sleeve 130, and the needle shaft 110. It has a first locking part 141, a second locking part 142, and a third locking part 143. The first locking part 141 is sloped and fits into the second abutment part 133 of the sleeve 130. The second locking part 142 fits into the outer abutment part 116 of the needle shaft 110. The third locking part 143 fits into the horizontal transition part 117 of the needle shaft 110. The ferrule 140 also has a first locking space 144, a second locking space 145, and a third locking space 146 that are connected sequentially along the axial direction in the middle. The first locking space 144 allows the needle tube 120 to pass through. The second locking space 145 is used to accommodate the sleeve 130. The third locking space 146 is fitted onto the outside of the lower end of the needle shaft 110 and has a diameter slightly smaller than the diameter of the lower end of the needle shaft 110, allowing for compression installation.

[0036] The flexible sleeve 130 is fitted onto the outer wall of the rigid needle tube 120 through the tube hole 131. Because there are contraction portions 134 at both ends of the tube hole 131, the inner diameter of the contraction portion 134 is slightly smaller than the outer diameter of the rigid needle tube 120 in the initial state. When the sleeve 130 moves toward the needle shaft 110, its first abutment portion 132 abuts against the inner abutment portion 115 of the needle shaft 110. The sleeve 130 is compressed and deformed, and the contraction portion 134 of the tube hole 131 tightens further. The structure inclined in the axial direction guides the contraction portion 134 to wrap the needle tube 120 more tightly, forming a tight fit with the smooth outer wall of the needle tube 120. This achieves both the initial fixation of the needle tube 120 and blocks the path of leakage of the injection liquid from the gap between the mounting hole 113 and the needle tube 120 through the tight fit of the contraction portion 134.

[0037] A flexible ferrule 140 is fitted over the rigid needle tube 120, sleeve 130, and needle shaft 110. The needle tube 120 passes through the first locking space 144, and the sleeve 130 is located within the second locking space 145. The first locking portion 141 of the ferrule 140 abuts against the second abutment portion 133 of the sleeve 130, the second locking portion 142 abuts against the outer abutment portion 116 of the needle shaft 110, and the third locking portion 143 abuts against the horizontal transition portion 117 of the needle shaft 110. Because the ferrule 140 is flexible and the diameter of the third snap-fit ​​space 146 is slightly smaller than the diameter of the lower end of the needle shaft 110, the ferrule 140 is compressed and deformed during installation. The force of multiple sets of abutment surfaces further presses the sleeve 130 into the abutment part 115 inside the needle shaft 110, increasing the squeezing force of the sleeve 130 contraction part 134 on the needle tube 120. The continuous tightening force of the sleeve 130 contraction part 134 ensures that the needle tube 120 does not loosen.

[0038] Specifically, the end of the rigid needle tube 120 is inserted into the mounting hole 113 of the needle shaft 110 to ensure that it is coaxial with the flow channel 112. At this time, the needle tube 120 is only positioned through the mounting hole 113 and is not fixed.

[0039] The flexible sleeve 130 is inserted into the end of the needle tube 120 away from the needle shaft 110. Since the initial inner diameter of the constricted portion 134 of the tube hole 131 is slightly smaller than the outer diameter of the needle tube 120, it initially forms a preliminary fit with the outer wall of the needle tube 120 upon insertion. The sleeve 130 is continued to be pushed towards the needle shaft 110 until the first abutment portion 132 of the sleeve 130 contacts the inner abutment portion 115 of the needle shaft 110. With continued force, the sleeve 130 deforms under the pressure of the inner abutment portion 115, and the constricted portions 134 at both ends of the tube hole 131 further tighten towards the axis along the inclined direction, forming a tight fit with the smooth outer wall of the needle tube 120, achieving initial fixation of the needle tube 120. Simultaneously, the fit of the constricted portions 134 prevents leakage of the injection fluid from the gaps.

[0040] The flexible ferrule 140 is inserted from the end of the needle tube 120 away from the needle shaft 110, so that the needle tube 120 passes through the first locking space 144. The ferrule 140 is moved until the first locking part 141 engages with the second abutment part 133 of the tube sleeve 130. The inclined surfaces interact to prevent axial slippage, and the tube sleeve 130 is included in the second locking space 145. The second locking part 142 is in contact with the outer abutment part 116 of the needle shaft 110, and the third locking part 143 is in contact with the horizontal transition part 117 of the needle shaft 110. Because the ferrule 140 is flexible and preferably the diameter of the third snap-fit ​​space 146 is slightly smaller than the outer diameter of the lower end of the needle shaft 110, the ferrule 140 is compressed and deformed, generating a centripetal tightening force. Through the first snap-fit ​​part 141, the tube sleeve 130 is further pressed against the needle shaft 110, which increases the squeezing force of the tube sleeve 130 contraction part 134 on the needle tube 120, and finally forms a stable multiple fixation, ensuring that the rigid needle tube 120 has no displacement when rotating and lifting.

[0041] The injection machine using the aforementioned self-rotating injection needle can be configured with a large number of injection needles, such as YS147 (147 needles), YS258 (258 needles), YS369 (369 needles), YS370 (370 needles), etc., to meet the needs of different batches of meat processing.

[0042] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A needle shaft, characterized in that, For connection with a needle tube (120) to form an injection needle (100), the needle shaft (110) has a transmission tooth (111) which is configured to be connected to a drive device so that the drive device can drive the needle shaft (110) to rotate through the transmission tooth (111), thereby driving the injection needle (100) to rotate.

2. A needle shaft according to claim 1, characterized in that, The needle shaft (110) has a flow channel (112) for the flow of injection fluid and a mounting hole (113) communicating with the flow channel (112). The mounting hole (113) is used to mount the end of the needle tube (120). The mounting hole (113) is coaxially arranged with the flow channel (112) and located below the flow channel (112). The diameter of the mounting hole (113) is larger than the diameter of the flow channel (112).

3. A needle shaft according to claim 2, characterized in that, The upper sidewall of the flow channel (112) is provided with a plurality of liquid inlet holes (114) extending radially through it. The plurality of liquid inlet holes (114) are arranged at intervals along the height direction. The needle shaft (110) is configured such that the liquid inlet holes (114) are used to introduce injection liquid into the flow channel (112), and the flow channel (112) is used to guide the injection liquid to the mounting hole (113).

4. A needle shaft according to claim 3, characterized in that, The plurality of liquid inlet holes (114) are arranged at intervals along the height direction and at intervals along the circumference of the needle shaft (110). The plurality of liquid inlet holes (114) are configured such that the orientation of any liquid inlet hole (114) does not overlap with that of the other liquid inlet holes (114).

5. An injection needle, characterized in that, The device includes a needle tube (120) and a needle shaft as described in any one of claims 2-4, wherein the needle tube (120) is disposed in the mounting hole (113), the tube of the needle tube (120) is connected to the flow channel (112), and the diameter of the tube of the needle tube (120) is greater than or equal to the diameter of the flow channel (112).

6. An injection needle according to claim 5, characterized in that, The mounting hole (113) has an annular inner abutment portion (115) on the inner wall of the end away from the flow channel (112). The inner abutment portion (115) extends obliquely from the outside to the inside towards the side closer to the flow channel (112) and its diameter gradually decreases. The injection needle further includes: The sleeve (130) has a first abutment (132) for abutting against the inner abutment (115) and a tube hole (131) for the needle tube (120) to pass through, the sleeve (130) being fitted onto the needle tube (120); A ferrule (140) is used to fit over the needle tube (120), the tube sleeve (130), and the needle shaft (110).

7. An injection needle according to claim 6, characterized in that, The sleeve (130) also has a second abutment (133), and the first abutment (132) and the second abutment (133) are respectively located at the two axial ends of the sleeve (130). The second set of abutment (133) is sloped, and the sleeve (140) has a first snap-fit ​​portion (141) for abutting against the second set of abutment (133).

8. An injection needle according to claim 7, characterized in that, The outer wall of the end of the mounting hole (113) away from the flow channel (112) also has an annular outer abutment portion (116), which extends obliquely from the outside to the inside toward the side close to the flow channel (112) and the diameter gradually increases. The sleeve (140) has a second snap-fit ​​portion (142) for abutting against the outer abutment portion (116).

9. An injection needle according to claim 8, characterized in that, A horizontal transition portion (117) is provided between the outer abutment portion (116) and the inner abutment portion (115), and the sleeve (140) has a third snap-fit ​​portion (143) for abutting against the horizontal transition portion (117).

10. An injection needle according to claim 9, characterized in that, The sleeve (130) is flexible, and the two ends of the tube hole (131) have contraction portions (134), which extend obliquely from the inside to the outside towards the side close to the axis of the tube hole (131).

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