An electronic expansion valve

Abstract

An electronic expansion valve, characterized in that it includes a valve body component, a nut component, a screw rod and a valve needle, the valve body component has a valve mouth portion, the screw rod includes a screw rod threaded portion, the nut component includes a nut threaded portion, the screw rod threaded portion is threadedly engaged with the nut threaded portion, the valve needle includes a valve needle guide portion, the valve body component also includes a valve body guide portion, the valve needle guide portion is slidingly engaged with the valve body guide portion, the valve needle can approach or move away from the valve mouth portion, the screw rod includes a supporting portion, the valve needle also includes a hanging portion, the supporting portion is closer to the valve mouth portion relative to the hanging portion, and the supporting portion can be offset against the hanging portion.

Description

Technical field

[0001] The present invention relates to the technical field of refrigeration control, and in particular to an electronic expansion valve. [Background Technology]

[0002] The electronic expansion valve includes a valve body, a nut assembly and a screw valve needle component. The valve body is provided with a valve port. The nut assembly is fixedly connected to the valve body. The screw valve needle component includes a screw and a valve needle. The screw and the nut assembly are threaded together. The valve needle can perform axial lifting and lowering movements to approach or move away from the valve port due to the excitation of the coil and the transmission effect of the thread. Affected by the processing deviation or actuation of the parts, when the screw is deflected, the valve needle may be affected by the screw and deflected relative to the valve port. [Summary of the invention]

[0003] The object of the present invention is to provide an electronic expansion valve with a new structure, which can relatively reduce the situation where the valve needle is affected by the actuation of the screw rod and the valve port is deflected.

[0004] The present invention provides an electronic expansion valve, including a valve body component, a nut component, a screw rod and a valve needle, the valve body component has a valve mouth portion, the screw rod includes a screw rod threaded portion, the nut component includes a nut threaded portion, the screw rod threaded portion is threadedly engaged with the nut threaded portion, the valve needle includes a valve needle guide portion, the valve body component also includes a valve body guide portion, the valve needle guide portion is slidingly engaged with the valve body guide portion, the valve needle can approach or move away from the valve mouth portion, the screw rod includes a supporting portion, the valve needle also includes a hanging portion, the supporting portion is closer to the valve mouth portion relative to the hanging portion, and the supporting portion can be offset against the hanging portion.

[0005] The present invention optimizes the design of the electronic expansion valve structure. The screw rod includes a supporting portion, the valve needle includes a valve needle guide portion and a hanging portion, the valve needle guide portion and the valve body guide portion are slidably matched, and the supporting portion can offset the hanging portion, which can relatively reduce the situation where the valve needle is affected by the screw rod and deflected from the valve port.

Brief Description of the Drawings

[0006] Figure 1 A cross-sectional view of the overall structure of the first embodiment of the electronic expansion valve provided by the present invention (the valve needle is relatively far away from the valve port);

[0007] Figure 2 for Figure 1 Cross-sectional view of the matching structure of the nut component, the screw rod and the valve needle;

[0008] Figure 3 A three-dimensional schematic diagram of the screw rod and valve needle structure of the first embodiment of the electronic expansion valve provided by the present invention;

[0009] Figure 4A cross-sectional view of the overall structure of the first embodiment of the electronic expansion valve provided by the present invention (the valve needle and the valve port are in contact with each other);

[0010] Figure 5 for Figure 4 A cross-sectional view of the matching structure of the screw rod and the valve needle of the first embodiment of the electronic expansion valve;

[0011] Figure 6 Another structural schematic diagram of the first abutting portion provided by the present invention that is an integral structure with the valve needle;

[0012] Figure 7 This is a structural schematic diagram of a second abutting portion provided on the screw rod provided by the present invention;

[0013] Figure 8 Another structural schematic diagram of the second abutting portion provided in one piece with the screw rod provided by the present invention;

[0014] Figure 9 A schematic perspective view of a valve needle structure of a second embodiment of the electronic expansion valve provided by the present invention;

[0015] Figure 10 A three-dimensional schematic diagram of the matching structure of the valve needle and the screw rod of the second embodiment of the electronic expansion valve provided by the present invention;

[0016] Figure 11 A cross-sectional view of the connection structure between the valve needle and the screw rod of the second embodiment of the electronic expansion valve provided by the present invention;

[0017] Figure 12 For application Figure 11 Schematic diagram of the overall structure of the second embodiment of the electronic expansion valve (the valve needle and the valve port are not in contact);

[0018] Figure 13 For application Figure 11 Schematic diagram of the overall structure of the second embodiment of the electronic expansion valve (the valve needle and the valve port are in contact with each other);

[0019] Figure 14 This is a schematic diagram of the overall structure of the electronic expansion valve provided in this application, in which no steel ball is provided between the screw rod and the valve needle (the valve needle is in contact with the valve mouth);

[0020] Figure 15 for Figure 14 A three-dimensional side view of the screw rod and a three-dimensional schematic diagram of the screw rod and valve needle structure;

[0021] Figure 16 Schematic diagram of another structure of the electronic expansion valve provided in this application without a steel ball between the screw rod and the valve needle [Specific implementation method]

[0022] It should be noted that the present invention focuses on protecting the connection between the valve needle and the screw rod, as well as the matching relationship between the valve needle, the screw rod, the nut and the valve body. Other structures of the electronic expansion valve, such as the rotor component, the coil component and other structures, can be changed and adjusted according to the system or other needs and occasions.

[0023] The present application provides an electronic expansion valve, including a valve body component 10, a nut component 50, a screw rod 60 and a valve needle 70. The valve body component 10 has a valve mouth portion 11 and a valve body guide portion 13. The valve mouth portion 11 is provided with a valve port 110. The valve body component 10 as a whole can be integrally formed by lathing or the like, or the valve mouth portion 11 and / or the guide portion 13 can be separately provided and then assembled and fixedly connected. For example, the valve mouth portion 11 and the valve body component 10 can be separately provided and then the two can be fixedly connected. The valve mouth portion 11 refers to the part where the valve port 110 is located. The guide portion 13 can be an integral structure with the valve body component 10, or it can be separately provided and processed as a separate component and then fixedly connected to the valve body component 10. The guide portion 13 has a guide hole. When the electronic expansion valve is fully closed and there is no flow adjustment, the valve needle 70 can be set close to or away from the valve mouth portion 11. The valve needle can be against the valve mouth portion 11, and the refrigerant cannot flow out from the valve port 110 toward the longitudinal pipe after entering the valve cavity from the transverse pipe.

[0024] The nut component 50 can be fixedly connected to the valve body component 10, the screw rod 60 includes a screw rod threaded portion 61, the nut component 50 includes a nut threaded portion 53 and a nut guide portion 54, the screw rod threaded portion 61 is threadedly matched with the nut threaded portion 53, the screw rod 60 also includes a support portion 621, a valve needle 70 hanging portion 721, and the valve needle guide portion 72 is slidably matched with the valve body guide portion 13 of the valve body component 10, the valve needle 70 can be axially lifted and lowered to approach or move away from the valve port 110, the support portion 621 is closer to the valve port portion 11 relative to the hanging portion 721, and the support portion 621 can be against the hanging portion 721, the screw rod 60 can carry the valve needle 70 away from the valve port portion 11 direction movement, through the optimized design of the valve needle and the screw rod structure, and the matching structure of the two, when the electronic expansion valve is actuated, the valve needle 70 can be self-guided as an independent component and slide-matched with the valve body guide part 13 of the valve body component 10, which greatly reduces the influence of the screw rod actuation, and has a greater correlation with the screw rod only when it is actuated axially upward. When the screw rod is deflected relative to the valve port 110 due to processing tolerance or the actuation environment, the valve needle 70 is less affected by the deflection of the screw rod and deflected relative to the valve port 110, which can ensure the coaxiality of the valve needle 70 and the valve port 110, and relatively ensure the reliability of the valve actuation.

[0025] It should be noted that the valve body guide portion 13 stated in this application refers to the valve body component that may include a guide section that can slide with the valve needle to provide a guiding effect on the valve needle, and it does not have to be a complete solid guide component formed on the inner periphery of the valve body component; similarly, the valve needle guide portion refers to the valve needle that includes a guide section that can slide with the valve body guide portion, and it does not have to be a complete solid guide component formed on the outer periphery of the valve needle.

[0026] Please refer to the following instructions Figure 1-8 , the first embodiment provided by this application is described in detail, such as Figure 1 As shown, the electronic expansion valve includes a valve body component 10, a connecting seat 20 and a housing 30. The connecting seat 20 is fixedly connected to the valve body component 10, and the housing 30 is fixedly connected to the connecting seat 20. The connecting seat 20 can be integrally processed with the valve body component 10. The valve body component 10, the connecting seat 20 and the housing 30 roughly define the valve cavity of the electronic expansion valve. The valve cavity accommodates a rotor component 40, a part of the nut component 50 and a part of the screw rod 60. The rotor component 40 includes a rotor and a rotor seat. 42. The rotor and the rotor seat 42 are integrally injection molded. The screw 60 includes an external threaded portion 61, a screw guide portion 62 and a screw abutment 63. The screw 60 rotates with the rotor. The screw abutment 63 is located above the external threaded portion 61, and the screw guide portion 62 is located below the external threaded portion 61. The screw abutment 63 is roughly a smooth segment structure. The end of the screw abutment 63 can be set to a spherical structure so that it can abut against the housing 30. The screw abutment 63 slides with the rotor seat 42.

[0027] like Figure 1 as well as Figure 2As shown, the nut component 50 includes a nut body 51 and a connecting portion 52. The nut body 51 has an internal threaded portion 53, which is screwed together with the external threaded portion 61. The screw thread portion of the screw rod 60, that is, the external threaded portion 61 and the internal threaded portion 53 of the nut always maintain a full-tooth screwed state in both the valve opening and valve closing states. When the valve is fully opened, the teeth of part of the external threaded portion 61 are engaged with the internal threaded portion 53, and the teeth of another part of the external threaded portion 61 are located above the internal threaded portion 53, and the teeth of the other part of the external threaded portion 61 are located below the internal threaded portion 53, which can relatively reduce the screw thread. The rod wears the teeth of the nut component 50 during the actuation process, thereby extending the service life of the components. The nut component 50 can be an injection molded part, the nut body 51 is a plastic part, and the connecting part 52 is made of metal. The nut body 51 and the connecting part 52 are insert-molded, and the connecting part 52 is fixedly connected to the valve body component 10 so that the nut component 50 is fixed to the valve body component 10 as a whole, or the nut component 50 as a whole can also be formed of metal material, and the nut component 50 is directly fixedly connected to the valve body component 10. The nut 50 has a nut guide hole and also includes a nut guide part 54. The nut guide 5 4 is located below the nut threaded portion, i.e., the internal threaded portion 53. The inner diameter of the nut guide hole is larger than the inner diameter of the internal threaded portion. The nut guide portion is generally a smooth section structure. The screw guide portion 62 and a portion of the valve needle 70 can be located in the nut guide hole. The screw guide portion 62 and the nut guide portion 54 are in sliding guide fit or clearance fit. A portion of the valve needle 70 can be in sliding fit with the nut guide portion 54. The valve body component 10 further includes a valve body guide portion 13. The valve needle guide portion 72 of the valve needle 70 is in sliding fit with the valve body guide portion 13. It should be noted that this does not exclude the possibility that a portion of the valve needle 70 can also extend into the nut guide portion The hole and the nut guide portion 54 can be slidably fitted or clearance-fitted. For example, part of the valve needle guide portion 72 extends into the nut guide hole and can be slidably guided or clearance-fitted with the nut guide portion 54. The screw rod 60 can be against the valve needle 70. Through the excitation action of the coil component, when the valve opening action is required, the screw rod 60 can lead the valve needle 70 to axially lift upward to gradually move away from the valve port 110. When the valve closing action is required, the screw rod 60 and the valve needle 70 move axially downward together. The valve needle 70 can approach or move away from the valve port 110 to adjust the refrigerant flow through the valve port.

[0028] like Figure 3As shown, the screw rod 60 can be formed as a whole by lathing, and stainless steel can be used for easy production. The screw rod 60 includes a screw rod guide portion 62 and a support portion 621. The screw rod 60 has a first accommodating portion 623 and a screw rod slot 622. The support portion 621 of the first embodiment provided by the present application at least includes a protrusion extending radially from the lower end position of the screw rod toward the central axis of the screw rod in the direction close to the valve mouth portion 11. Specifically, the support portion 621 includes a first support portion 621a, and the valve needle 70 is inserted into the first accommodating portion 623. The first support portion 621a is roughly a hook-shaped portion extending radially from the screw rod guide portion 62 toward the central axis of the screw rod. The valve needle 70 includes a hook-shaped portion that can be connected with the screw rod. The valve needle abutment portion and the valve needle recess 74 abutting the valve mouth portion 11, the hanging portion 721 of the first embodiment provided in the present application at least includes a protrusion radially extending from the upper end position of the valve needle in the direction away from the valve needle center axis in a direction relatively away from the valve mouth portion 11. Specifically, the hanging portion 721 includes a first hanging portion 721a, and the valve needle recess 74 is located between the first hanging portion 721a and the valve needle guide portion 72. The valve needle can radially extend into the first accommodating portion 623 through the screw rod slot 622, and the valve needle 70 as a whole can rotate freely relative to the screw rod 60. The first hanging portion 721a is located in the first accommodating portion, and the first support portion 621a can abut against the first hanging portion 721a. The first support The support portion 621a and the screw guide portion 62 can be an integral structure, and the first support portion 621a can also be set separately from the screw guide portion 62 and then fixedly connected or limitedly connected or bonded. The first support portion 621a can be set as, for example, a retaining ring structure, and the telescopic force of the retaining ring is used to achieve a fixed connection or limited connection with the screw guide portion 62, or the first support portion 621 can also be set as a structure such as a retaining spring or a latch. A groove corresponding to the retaining spring or a mounting hole corresponding to the latch is provided on the screw guide portion 62, so that the retaining spring and the groove are engaged and limited, and the latch is limitedly connected to the mounting hole. The first support portion 621a at least includes a protrusion extending roughly radially from the screw guide portion 62, and the first support portion 621a is provided with a plurality of protrusions. The support portion 621a as a whole can be roughly in a structure that forms a perpendicular intersection with the screw rod 60, or the first support portion 621a and the screw rod 60 have an angle and are overall inclined. It is only necessary to ensure that the first support portion 621a can be offset against the first suspension portion 721a. Through the optimization of the valve needle and the screw rod structure and the matching structure of the two, the valve needle, as a relatively independent component, can be self-guided, and only has a greater correlation with the screw rod when it moves axially upward. When the screw rod actuation is relatively deflected due to the processing tolerance of the components or the actuation environment, the valve needle is less affected by the screw rod and can still maintain coaxiality with the valve mouth, thereby relatively ensuring the reliability of the valve actuation.

[0029] Furthermore, the valve needle 70 has a valve needle receiving groove 73. The valve needle 70 includes a valve needle guide portion 72, a hanging portion 721, a valve needle abutment portion and a valve needle recess 74. In this embodiment, the hanging portion 721 includes a first hanging portion 721a which is roughly a protrusion extending radially in all directions from the valve needle recess 74. The valve needle receiving groove 73 is roughly formed by the end surface of the first hanging portion 721a being recessed inwardly. The outer diameter of the first hanging portion 721a is greater than the inner diameter of the first support portion 621a so that the first hanging portion 721 a is supported on the first support portion 621a, the first support portion 621a is located below the first hanging portion 721a, and the first support portion 621a is closer to the valve mouth portion 11 than the first hanging portion 721a, the first hanging portion 721a and the valve needle guide portion 72 are an integral structure, or the first hanging portion 721a can also be set separately from the valve needle guide portion 72 and then fixedly connected or limitedly connected or bonded. Referring to the setting method of the first support portion 621a, the first hanging portion 721a can be set as, for example, a blocking When the cam 721 is in the closed position, the first stop 721a and the second stop 722 are in the closed position, and the stop 721b is in the open position, so that the cam 721b can be fixed to the cam 720 via the push rod 624, and the stop 722b can be fixed to the cam 620 via the push rod 624.

[0030] It should be noted that the radial direction stated in the description of this application refers to both the radial direction extending in the horizontal direction and the radial direction extending in a roughly inclined direction. It should also be noted that the valve needle or screw rod component stated in this application can be an integral structure formed by lathing or the like, or it can be a screw rod assembly or valve needle assembly assembled from several parts. For example, the screw rod guide portion 62 and the first support portion 621 of the screw rod 60 can be separately arranged and processed and then assembled to form the screw rod assembly 60.

[0031] The first hanging portion 721a is located in the first accommodating portion 623, and the first hanging portion 721a and the first supporting portion 621a can be abutted against each other. The screw rod 60 and the valve needle 70 are suspended and supported in a manner similar to a hook. The position where the first hanging portion 721a and the first supporting portion 621a abut against each other is defined as the first abutting position A. The electronic expansion valve also includes a steel ball 80, which is located in the valve needle accommodating groove 73. The overall shape of the valve needle accommodating groove 73 is adapted to the steel ball 80. The screw rod 60 also has a screw rod end face 64. The diameter of the steel ball 80 is smaller than the distance between the groove bottom of the valve needle accommodating groove 73 and the screw rod end face 64, which can ensure that the steel ball 80 can rotate freely. The valve needle 70 as a whole can rotate freely relative to the screw rod 60. Figure 5 As shown, when the valve needle abutment portion of the valve needle 70 does not abut against the valve mouth portion 11, the distance between the screw end face 64 and the first abutment position A is set to L1, and the distance between the spherical end of the steel ball 80 and the first abutment position A is set to L2, where L1-L2>0, that is, there is a gap L3 between the spherical end face of the steel ball 80 and the screw end face 64, and L3>0.

[0032] Refer to the following Figure 1 and Figure 4The operating principle of the electronic expansion valve of the first embodiment provided by the present application is described in detail. Under the influence of the excitation of the coil component, the rotor rotates, and the rotor seat 42 and the screw rod 60 also rotate synchronously. Through the threaded cooperation of the screw rod 60 and the nut 50, the screw rod 60 and the valve needle 70 move axially downward together, and the valve needle 70 gradually approaches the valve port 110. When the valve needle 70 does not abut against the valve port portion 11, the steel ball 80 and the screw rod end face 64 of the screw rod 60 have a gap L3, and the first support portion 621a abuts against the first hanging portion 721a. Due to the existence of the gap L3, the screw rod 60 can still continue to move downward, and the screw rod 60 continues to move downward to eliminate the steel ball 80. The gap L3 between the steel ball 80 and the screw rod end face 64 is formed. When the steel ball 80 abuts against the screw rod 60, the valve needle 70 is driven downward by the rotation of the screw rod 60, and the valve needle 70 abuts against the valve mouth portion 11 and is in a tight state, and the gap L3 between the steel ball 80 and the screw rod end face 64 is transferred to between the first support portion 621a and the first hanging portion 721a. At this time, the first support portion 621a and the first hanging portion 721a have a gap L3', and the screw rod 60 is subjected to the reverse force of the steel ball 80, forming a resistance lower stop state and no longer moving downward, so as to form a lower stop structure of the electronic expansion valve. When the steel ball 80 abuts against the screw rod end face 64, the valve needle is driven by the driving force of the screw rod and the valve mouth portion. The valve needle and the screw rod are directly offset and in a tight state. By optimizing the structure of the screw rod and the valve needle of the electronic expansion valve, the valve needle and the screw rod are directly offset to achieve a suspended support connection, and the valve needle and the screw rod are connected by a rolling steel ball 80. During actuation, even if the screw rod 60 rotates, the force applied to the valve needle 70 can be greatly reduced. The torque transmitted downward when the screw rod rotates is reduced, thereby reducing the influence of the screw rod deflection on the valve needle. The steel ball 80 can rotate freely between the two, reducing the heat and dry friction caused by long-term force at the same point, greatly reducing friction, reducing the wear of the valve needle on the valve port caused by the influence of the screw rod rotation, and reducing the driving force. In order to reduce the loss during the downward transmission process, grease can be added to the valve needle accommodating groove 73. By utilizing the viscosity of the grease, the hidden danger of the steel ball 80 moving and generating noise can be reduced due to the adhesion of the grease during the actuation of the electronic expansion valve. The valve needle and the screw rod are directly pressed against each other to realize the suspension support connection setting. Part of the valve needle 70 is slidably matched with the valve body component 10. The valve needle can move freely within a certain gap after the screw rod is assembled. It is less affected by the cumulative coaxiality of the assembly of components such as the screw rod 60 and the nut 50, and the sealing effect with the valve mouth part 11 is better. In addition, the gap between the steel ball 80 and the screw rod is small, the valve opening pulse deviation is extremely small, and the overall flow deviation of the electronic expansion valve is small.

[0033] like Figure 7As shown, the screw rod 60 can also be provided with a screw rod accommodating groove 624, and part of the steel ball 80 is located in the screw rod accommodating groove 624. The screw rod 60 can clamp the steel ball 80 by riveting deformation by setting a deformation portion. When the valve needle 70 and the valve mouth part 11 are not in contact with each other, there is a gap between the steel ball 80 and the valve needle 70. When the steel ball 80 and the valve needle 70 are in contact with each other, the valve needle 70 and the valve mouth part 11 are in contact with each other, which can also achieve the technical effect of the present application. The relevant principles and detailed technical effects have been stated above and will not be repeated here.

[0034] The following combination Figure 9-13, briefly introduce the second embodiment of the electronic expansion valve provided by the present application. The difference from the first embodiment lies in the way the valve needle and the screw rod cooperate. The screw rod 60' in this embodiment includes a support portion, a screw rod recess 622' and a connecting portion 623'. The support portion in this embodiment can be a second support portion 621', and the screw rod recess 622' is located between the second support portion 621' and the connecting portion 623'. With reference to the setting method of the first support portion 621a, the second support portion 621' can be roughly a radial protrusion extending from the lower end position of the screw rod 60' near the valve mouth portion 11 in a direction away from the central axis of the screw rod 60'. Specifically, the second support portion 621' can be configured as a retaining ring, a retaining spring, a latch, or the like. To achieve a fixed connection or a limited connection with the screw rod recess 622' of the screw rod 60', the valve needle 70' includes a second valve needle guide portion 72a', a valve needle guide portion 72', a hanging portion and a valve needle abutment portion. The second valve needle guide portion 72a' is adapted to the nut guide hole, the second valve needle guide portion 72a' is slidably matched with the nut guide portion 54, the valve needle guide portion 72' is slidably matched with the valve body guide portion 13, the valve needle 70' has a second accommodating portion 71' and a valve needle notch 73'. In this embodiment, the hanging portion can be a second hanging portion 721', the second support portion 621' can abut against the second hanging portion 721', and the second support portion 621' is located below the second hanging portion 721', and the second support portion 621' is relative to the second hanging portion 721'. The second hanging portion 721' is closer to the valve mouth portion 11. The second hanging portion 721' can be an integral structure with the second valve needle guide portion 72a', or it can be fixedly connected or limit-connected to the second valve needle guide portion 72a'. Referring to the first hanging member setting method, the second hanging portion 721' can be roughly a radial protrusion extending from the upper end position of the valve needle 70' away from the valve mouth portion 11 toward the center axis of the valve needle 70'. The second hanging portion 721' can be configured as a retaining ring, a retaining spring, or a latch to achieve connection with the second valve needle guide portion 72a'. The screw rod 60' can be freely inserted into the second accommodating portion 71' through the valve needle notch 73'. The second support portion 621' is located in the second accommodating portion 71'. And the second support portion 621' can be abutted against the second hanging portion 721', and the screw rod 60' can move axially upward with the valve needle 70'. In at least one radial direction, the screw rod and the valve needle are not provided with a structure that can prevent the screw rod and the valve needle from detaching from each other. The screw rod can be inserted into the second accommodating portion of the valve needle through the valve needle groove roughly along the radial direction. After the installation is completed, the nut guide portion 54 of the nut component 50 roughly limits the screw rod and the valve needle radially, which can prevent the valve needle from detaching from the screw rod. The connection structure between the valve needle and the screw rod is relatively convenient and reliable, and the installation method is simpler. It should be noted that the radial direction stated in the description of this application refers to a radial direction extending in a horizontal direction and also includes a radial direction that can extend in a roughly inclined direction.The second support portion 621' includes a lower support end surface 6211' and an upper support end surface 6212'. The electronic expansion valve includes a steel ball 80. The screw rod 60' may be provided with a screw rod accommodating groove. The screw rod accommodating groove is recessed inward from the screw rod end surface of the screw rod 60'. Part of the steel ball 80 is located in the screw rod accommodating groove. The screw rod 60' may be provided with a deformation portion to clamp the steel ball 80 by riveting deformation. When the valve needle 70 and the valve mouth portion 11 are not in contact with each other, there is a gap between the steel ball 80 and the valve needle 70', and the upper support end surface 6212' and the second hanging portion 721' are in contact with each other; when the steel ball 80 and the valve needle 70' are in contact with each other, the valve needle 70 and the valve mouth portion 11 are in contact with each other, and there is a gap between the upper support end surface 6212' and the second hanging portion 721'.

[0035] Alternatively, the valve needle 70' may also be provided with a valve needle receiving groove 74', with part of the steel ball located in the valve needle receiving groove 74'. Grease is added to the valve needle receiving groove 74' to adhere the steel ball to prevent the steel ball from moving during actuation. When the valve needle 70' is relatively far away from the valve mouth 11 or contacts the valve mouth 11, that is, the valve needle 70' and the valve mouth 11 are not abutting against each other, the lower supporting end face 6211' of the second supporting part 621' and the steel ball 80 have a gap L3. When the lower supporting end face 6211' abuts against the steel ball, the valve needle 70' abuts against the valve mouth 11, and the gap L3 moves to between the upper supporting end face 6212' and the second suspension part 721'.

[0036] The following combination Figure 10-13 , briefly describe the actuation mode of the electronic expansion valve of the second embodiment provided by the present application, under the influence of the excitation effect of the coil component, the rotor rotates, the rotor seat 42 and the screw rod 60 'also rotate synchronously together, through the threaded cooperation of the screw rod 60 'and the nut 50, the screw rod 60 'and the valve needle 70 'move axially downward together, and the valve needle 70 'gradually approaches the valve port 110, when the valve needle 70 'is not in contact with the valve port portion 11, there is a gap L3 between the steel ball 80 and the lower supporting end surface 6211 'of the second supporting portion 621 ', and the second supporting portion 621 'is in contact with the second hanging portion 721 ', and the screw rod 60 can still continue to move downward due to the existence of the gap, and the screw rod 60 'continues to move downward The gap L3 between the steel ball and the lower support end surface 6211' is automatically eliminated. When the steel ball 80 abuts against the lower support end surface 6211', the gap disappears and the steel ball 80 abuts against the second support portion 621'. The valve needle 70 abuts against the valve mouth portion 11, and the gap L3 between the steel ball 80 and the lower support end surface 6211' of the second support portion 621' is transferred to between the upper support end surface 6212' and the second hanging portion 721'. At this time, there is a gap L3' between the second support portion 621' and the second hanging portion 721', and the screw rod 60' no longer moves downward due to the reverse force of the steel ball 80. The valve needle 70' and the valve mouth portion 11 are in a tight state to form a lower stop structure of the electronic expansion valve, as shown in FIG. Figure 15As shown, the valve needle abuts against the valve port 11, and the gap L3 moves to form a gap L3' between the second support portion 621' and the second suspension portion 721'. The corresponding technical effects have been described in detail in the first embodiment and will not be repeated here.

[0037] Other structures can also be provided between the screw rod and the valve needle to connect them. In the first embodiment, the valve needle 70 may include a first abutment portion 81, and the first abutment portion and the valve needle 70 are an integral structure, or the first abutment portion and the valve needle 70 can be provided separately and the two are fixedly connected or limit-connected or bonded. As shown in FIG / , the first abutment portion is roughly a hemispherical portion protruding from the valve needle recess 74 of the valve needle 70 toward the direction away from the valve mouth portion, and the arc-shaped portion or the angular portion can also be made to abut against the screw rod 60, roughly in a point contact state. The "roughly point contact state" here refers to a point contact state and a smaller plane shape processed on the hemispherical portion or the end of the steel ball. When the screw rod abuts against the steel ball or the first abutting portion, the screw rod-transmitted torque exerted on the valve needle is small or negligible. When the valve needle does not abut against the valve mouth, there is a gap between the screw rod and the first abutting portion, and the first support portion 621 abuts against the first hanging portion 721. When the screw rod abuts against the first abutting portion, the valve needle 70 abuts against the valve mouth portion 11, and there is a gap between the first support portion 621 and the first hanging portion 721.

[0038] Or in the first embodiment, as Figure 8 As shown, the screw rod may include a second abutting portion 81 ′, which is an integral structure with the screw rod, or the second abutting portion and the valve needle 70 may be separately provided and then fixedly connected, positionally connected, or bonded. The second abutment portion is roughly a hemispherical portion protruding from the screw guide portion 62 of the screw toward the valve mouth portion 11, or the second abutment portion can also be an arc-shaped portion or an angular portion, which can achieve abutment with the valve needle 70, and is roughly in a point contact state. The roughly point contact state here refers to the point contact state and processing a smaller plane shape on the hemispherical portion or the end of the steel ball. When the screw abuts against the steel ball or the first abutment portion, the screw-transmitted torque exerted on the valve needle is small or negligible. When the valve needle does not abut against the valve mouth portion, there is a gap between the valve needle and the second abutment portion 81′, and the first support portion 621 abuts against the first hanging portion 721. When the valve needle abuts against the second abutment portion, the valve needle 70 abuts against the valve mouth portion 11, and there is a gap between the first support portion 621 and the first hanging portion 721.

[0039] In the second embodiment, the valve needle 70' may include a first abutment portion, which may be a hemispherical portion protruding from the second valve needle guide portion 72a' toward the direction away from the valve mouth portion. The first abutment portion and the valve needle 70' are an integral structure, or the first abutment portion and the valve needle 70' may be separately provided and the two are fixedly connected or limit-connected or bonded. It can also be an arc-shaped portion or an angular portion, which can achieve abutment with the screw rod 60'. When the valve needle does not abut against the valve mouth portion, the lower supporting end face 6211' of the second supporting portion 621' of the screw rod 60' has a gap with the first abutment portion, and the upper supporting end face 6212' of the second supporting portion 621' abuts against the second hanging portion 721'. When the lower supporting end face 6211' abuts against the first abutment portion, the valve needle 70' abuts against the valve mouth portion 11, and the upper supporting end face 6212' of the second supporting portion 621' has a gap with the second hanging portion 721'.

[0040] In a second embodiment, the screw rod 60' may include a second abutment portion, which may be a hemispherical portion protruding toward the valve mouth portion by the second support portion 621' of the screw rod. The second abutment portion and the screw rod 60' are an integral structure, or the second abutment portion and the screw rod 60' may be separately provided and the two are fixedly connected or limit-connected or bonded. It may also be an arc-shaped portion or an angular portion, which can achieve abutment with the valve needle 70'. When the valve needle and the valve mouth portion are not abutted, the second valve needle guide portion 72a' of the valve needle 70' has a gap with the second abutment portion, and the upper support end face 6212' of the second support portion 621' of the screw rod 60' abuts against the second hanging portion 721'. When the second valve needle guide portion 72a' abuts against the second abutment portion, the upper support end face 6212' abuts against the second hanging portion 721'.

[0041] Alternatively, in the first and second embodiments, the valve needle may include a first abutting portion, and the screw rod may include a second abutting portion. When the valve needle and the valve mouth portion are not abutted, there is a gap between the first abutting portion and the second abutting portion, and the supporting portion and the hanging portion abut. When the first abutting portion and the second abutting portion abut, the valve needle and the valve mouth portion abut, and there is a gap between the supporting portion and the hanging portion.

[0042] It should be noted that the valve needle and the valve mouth mentioned in this application are against each other, which means that the valve needle is subjected to the force transmitted by the screw rod to bear against the valve mouth and form a tight state; when the valve needle and the valve mouth are not against each other, it means the state where the valve needle is relatively far away from the valve mouth, and also includes the state where the valve needle is in contact with the valve mouth but the valve needle is not subjected to the driving force of the screw rod to cause the valve needle and the valve mouth to bear against each other.

[0043] In addition, the offset stated in this application not only refers to the direct offset between components, but also includes the indirect offset between components through coatings or by additionally setting up third-party components.

[0044] The following combination Figure 14-16 Briefly introduce the third embodiment of the electronic expansion valve structure provided by this application. The difference from the first two embodiments is that the electronic expansion valve in this embodiment can be a one-way flow structure in which the refrigerant enters the horizontal pipe and flows out from the valve port 110 to the vertical pipe. The setting of the steel ball or the first abutment part or the second abutment part between the screw rod and the valve needle is cancelled. Figure 14 and Figure 15 As shown, the screw rod 60 includes a first notch 622 and a first accommodating portion 623, and also includes a first support portion 621. The valve needle 70 includes a first hanging portion 721, and the first hanging portion 721 extends into the screw rod 60 through the first notch 622 approximately in the radial direction. The first hanging portion 721 can abut against the first support portion 621. The first hanging portion 721 includes a lower hanging end surface and an upper hanging end surface. The screw rod 60 has a screw rod end surface 64. When the valve needle and the valve port portion 11 are not abutted, the first hanging portion 721 abuts against the first support portion 621; when the valve needle and the valve port portion 11 abut, a gap L4 is formed between the lower hanging end surface of the first hanging portion 721 and the first support portion 621, and a gap L5 is formed between the upper hanging end surface and the screw rod end surface. The valve needle closes the valve port portion 11 by its own gravity. Due to the excitation of the coil, when the screw rod 60 rotates downward, compared with the structure with a steel ball, although more torque will be applied to the valve needle, smooth valve closing can still be achieved.

[0045] like Figure 16 As shown, the screw rod 60' includes a second supporting portion 621', the valve needle 70' includes a second hanging portion 721', and the valve needle 70' has a first accommodating portion 71' and a second notch 73'. The screw rod 60' extends into the valve needle through the second notch 73' roughly in the radial direction. When the valve needle and the valve mouth portion 11 are not in contact with each other, the second hanging portion and the second supporting portion are in contact with each other; when the valve needle and the valve mouth portion are in contact with each other, there is a gap L4' between the upper supporting end surface of the second supporting portion 621' and the second hanging portion 721', and there is a gap L5' between the lower supporting end surface of the second supporting portion 621' and the valve needle 70'. Due to the excitation of the coil, when the screw rod 60' rotates downward, compared with the structure with a steel ball, although more transmitted torque will be applied to the valve needle, smooth valve closing can still be achieved. The present application provides an electronic expansion valve, including a valve body component, a nut component, a screw rod and a valve needle. The valve body component includes a valve mouth portion and a valve body guide portion. The screw rod includes a screw rod threaded portion. The nut component includes a nut threaded portion. The screw rod threaded portion and the nut threaded portion are threadedly engaged. The screw rod includes a supporting portion. The valve needle includes a valve needle guide portion and a hanging portion. The valve needle guide portion and the valve body guide portion are slidingly engaged. The valve needle can approach or move away from the valve mouth portion. The supporting portion is closer to the valve mouth portion than the hanging portion. The supporting portion can be against the hanging portion. The screw rod can carry the valve needle to move in a direction away from the valve mouth portion.

[0046] Through the optimized design of the valve needle and screw rod structure, as well as the matching structure of the two, when the electronic expansion valve is actuated, the valve needle can guide itself as an independent component and slide with the valve body guide part of the valve body component, which greatly reduces the influence of the screw rod actuation. It is only closely related to the screw rod when actuated in the axial upward direction. When the screw rod deflects relative to the valve port due to processing tolerance or the actuation environment, the valve needle is less affected by the deflection of the screw rod and deflects relative to the valve port, which can ensure the coaxiality of the valve needle and the valve port, and relatively ensure the reliability of the valve actuation.

[0047] It should be noted that the ordinal numbers "first, second" and the directional words "upper, lower" stated in this application are all explained based on the drawings in the specification of the present invention, and do not impose any restrictions on the structure or order of components.

[0048] Specific examples are used herein for illustration, and the above embodiments are merely intended to facilitate understanding of the method and core concepts of the present invention. It should be noted that, without departing from the principles of the present invention, a number of improvements and modifications may be made to the present invention by those skilled in the art, and such improvements and modifications fall within the scope of protection of the claims of the present invention.

Claims

1. An electronic expansion valve, characterized in that: The valve body comprises a valve body component, a nut component, a screw rod and a valve needle, wherein the valve body component has a valve mouth portion, the screw rod comprises a screw rod threaded portion, the nut component comprises a nut threaded portion, the screw rod threaded portion and the nut threaded portion are threadedly engaged with each other, the valve needle comprises a valve needle guide portion, the valve body component further comprises a valve body guide portion, the valve needle guide portion and the valve body guide portion are slidably engaged with each other, the valve needle can approach or move away from the valve mouth portion, the screw rod comprises a supporting portion, the valve needle further comprises a hanging portion, the supporting portion is closer to the valve mouth portion than the hanging portion, and the supporting portion can abut against the hanging portion; The screw rod includes a screw rod guide portion, the screw rod guide portion is closer to the valve mouth portion than the screw rod thread portion, the nut includes a nut guide portion, the screw rod guide portion and the nut guide portion are slidingly guided or clearance-fitted, the screw rod has a first accommodating portion and a screw rod slot, the valve needle is inserted into the first accommodating portion, the screw rod has a screw rod end face, the support portion includes a first support portion, the valve needle includes a valve needle abutting portion and a valve needle recess, the hanging portion includes a first hanging portion, the valve needle recess is located between the valve needle guide portion and the first hanging portion, the valve needle is inserted into the first accommodating portion through the screw rod slot, the first hanging portion can abut against the first supporting portion, and in at least one radial direction, the screw rod and the valve needle are not provided with a structure that can prevent the screw rod and the valve needle from detaching from each other; The first supporting portion is closer to the valve mouth portion than the first hanging portion, and the valve needle has a valve needle accommodating groove, which is roughly recessed inward from the end surface of the first hanging portion. The electronic expansion valve also includes a steel ball, part of which is located in the valve needle accommodating groove, and the diameter of the steel ball is smaller than the distance between the bottom of the valve needle accommodating groove and the end surface of the screw rod; when the valve needle and the valve mouth portion are not in contact with each other, a gap L3 is formed between the steel ball and the end surface of the screw rod, and when the valve needle and the valve mouth portion are in contact with each other and are in a tight state, and the gap L3 between the steel ball and the end surface of the screw rod is transferred to between the first supporting portion and the first hanging portion, at this time, a gap L3' is formed between the first supporting portion and the first hanging portion.

2. The electronic expansion valve according to claim 1, characterized in that: The steel ball can rotate freely, and the valve needle receiving groove is provided with grease.

3. The electronic expansion valve according to claim 1 or 2, characterized in that: The first supporting portion at least includes a protrusion extending radially toward the central axis of the screw rod at the lower end position of the screw rod near the valve mouth portion, and the first hanging portion at least includes a protrusion extending radially from the upper end position of the valve needle toward the central axis of the valve needle relatively away from the valve mouth portion. The first supporting portion and the screw rod are an integral structure, or the first supporting portion is fixedly connected or limit-connected to the screw rod portion, and the first hanging portion and the valve needle are an integral structure, or the first hanging portion is fixedly connected or limit-connected to the valve needle.

4. An electronic expansion valve, characterized in that: The valve body comprises a valve body component, a nut component, a screw rod and a valve needle, wherein the valve body component has a valve mouth portion, the screw rod comprises a screw rod threaded portion, the nut component comprises a nut threaded portion, the screw rod threaded portion and the nut threaded portion are threadedly engaged with each other, the valve needle comprises a valve needle guide portion, the valve body component further comprises a valve body guide portion, the valve needle guide portion and the valve body guide portion are slidably engaged with each other, the valve needle can approach or move away from the valve mouth portion, the screw rod comprises a supporting portion, the valve needle further comprises a hanging portion, the supporting portion is closer to the valve mouth portion than the hanging portion, and the supporting portion can abut against the hanging portion; The valve needle has a second accommodating portion and a valve needle notch, the screw rod is inserted into the second accommodating portion, the screw rod further includes a screw rod recess and a connecting portion, the support portion includes a second support portion, the screw rod recess is located between the second support portion and the connecting portion, the hanging portion includes a second hanging portion, the screw rod is inserted into the second accommodating portion through the valve needle notch, the second support portion is closer to the valve port portion than the second hanging portion, the second support portion can abut against the second hanging portion, and in at least one radial direction, the screw rod and the valve needle are not provided with a structure that can prevent the screw rod and the valve needle from detaching from each other; The second supporting portion includes a lower supporting end surface and an upper supporting end surface, and the electronic expansion valve includes a steel ball. When the valve needle and the valve mouth portion are not in contact with each other, there is a gap between the lower supporting end surface and the steel ball, and the upper supporting end surface and the second hanging portion are in contact with each other; when the lower supporting end surface and the steel ball are in contact with each other, the valve needle and the valve mouth portion are in contact with each other, and there is a gap between the upper supporting end surface and the second hanging portion.

5. The electronic expansion valve according to claim 4, characterized in that: The valve needle portion includes a second valve needle guide portion, which is further away from the valve port portion than the valve needle guide portion. The nut includes a nut guide portion, and the second valve needle guide portion is in sliding guide fit or clearance fit with the nut guide portion.

6. The electronic expansion valve according to claim 5, characterized in that: The second supporting portion may be roughly in the form of a radial protrusion extending from the lower end position of the screw rod near the valve mouth portion toward the direction away from the central axis of the screw rod, and the second hanging portion may be roughly in the form of a radial protrusion extending from the upper end position of the valve needle away from the valve mouth portion toward the direction close to the central axis of the valve needle. The second supporting portion and the screw rod are an integral structure, or the second supporting portion is fixedly connected or limit-connected to the screw rod, the second hanging portion and the second valve needle are an integral structure, or the second hanging portion is fixedly connected or limit-connected to the second valve needle.

7. An electronic expansion valve, characterized in that: The valve body comprises a valve body component, a nut component, a screw rod and a valve needle, wherein the valve body component has a valve mouth portion, the screw rod comprises a screw rod threaded portion, the nut component comprises a nut threaded portion, the screw rod threaded portion and the nut threaded portion are threadedly engaged with each other, the valve needle comprises a valve needle guide portion, the valve body component further comprises a valve body guide portion, the valve needle guide portion and the valve body guide portion are slidably engaged with each other, the valve needle can approach or move away from the valve mouth portion, the screw rod comprises a supporting portion, the valve needle further comprises a hanging portion, the supporting portion is closer to the valve mouth portion than the hanging portion, and the supporting portion can abut against the hanging portion; The screw rod includes a screw rod guide portion, the screw rod guide portion is closer to the valve mouth portion than the screw rod thread portion, the nut includes a nut guide portion, the screw rod guide portion and the nut guide portion are slidingly guided or clearance-fitted, the screw rod has a first accommodating portion and a screw rod slot, the valve needle is inserted into the first accommodating portion, the screw rod has a screw rod end face, the support portion includes a first support portion, the valve needle includes a valve needle abutting portion and a valve needle recess, the hanging portion includes a first hanging portion, the valve needle recess is located between the valve needle guide portion and the first hanging portion, the valve needle is inserted into the first accommodating portion through the screw rod slot, the first hanging portion can abut against the first supporting portion, and in at least one radial direction, the screw rod and the valve needle are not provided with a structure that can prevent the screw rod and the valve needle from detaching from each other; The screw rod has a screw rod accommodating groove, the screw rod has a screw rod end face, the screw rod accommodating groove is recessed inward from the screw rod end face, the electronic expansion valve also includes a steel ball, part of the steel ball is located in the screw rod accommodating groove, the screw rod clamps the steel ball by riveting and deformation, and the steel ball can be abutted against the valve needle; when the valve needle and the valve mouth are not abutted, there is a gap between the steel ball and the valve needle, and when the steel ball and the valve needle abut, the valve needle and the valve mouth abut.

8. An electronic expansion valve, characterized in that: The valve body comprises a valve body component, a nut component, a screw rod and a valve needle, wherein the valve body component has a valve mouth portion, the screw rod comprises a screw rod threaded portion, the nut component comprises a nut threaded portion, the screw rod threaded portion and the nut threaded portion are threadedly engaged with each other, the valve needle comprises a valve needle guide portion, the valve body component further comprises a valve body guide portion, the valve needle guide portion and the valve body guide portion are slidably engaged with each other, the valve needle can approach or move away from the valve mouth portion, the screw rod comprises a supporting portion, the valve needle further comprises a hanging portion, the supporting portion is closer to the valve mouth portion than the hanging portion, and the supporting portion can abut against the hanging portion; The valve needle has a second accommodating portion and a valve needle notch, the screw rod is inserted into the second accommodating portion, the screw rod further includes a screw rod recess and a connecting portion, the support portion includes a second support portion, the screw rod recess is located between the second support portion and the connecting portion, the hanging portion includes a second hanging portion, the screw rod is inserted into the second accommodating portion through the valve needle notch, the second support portion is closer to the valve port portion than the second hanging portion, the second support portion can abut against the second hanging portion, and in at least one radial direction, the screw rod and the valve needle are not provided with a structure that can prevent the screw rod and the valve needle from detaching from each other; The screw rod has a screw rod accommodating groove, the screw rod has a screw rod end face, the screw rod accommodating groove is recessed inward from the screw rod end face, the electronic expansion valve also includes a steel ball, part of the steel ball is located in the screw rod accommodating groove, the screw rod clamps the steel ball by riveting and deformation, and the steel ball can be abutted against the valve needle; when the valve needle and the valve mouth are not abutted, there is a gap between the steel ball and the valve needle, and when the steel ball and the valve needle abut, the valve needle and the valve mouth abut.

9. An electronic expansion valve, characterized in that: The valve body comprises a valve body component, a nut component, a screw rod and a valve needle, wherein the valve body component has a valve mouth portion, the screw rod comprises a screw rod threaded portion, the nut component comprises a nut threaded portion, the screw rod threaded portion and the nut threaded portion are threadedly engaged with each other, the valve needle comprises a valve needle guide portion, the valve body component further comprises a valve body guide portion, the valve needle guide portion and the valve body guide portion are slidably engaged with each other, the valve needle can approach or move away from the valve mouth portion, the screw rod comprises a supporting portion, the valve needle further comprises a hanging portion, the supporting portion is closer to the valve mouth portion than the hanging portion, and the supporting portion can abut against the hanging portion; The valve needle includes a first abutting portion. When the valve needle and the valve port portion are not abutting each other, a gap is formed between the first abutting portion and the screw rod, and the support portion and the hanging portion abut against each other. When the first abutting portion and the screw rod abut against each other, the valve needle and the valve port portion abut against each other, and a gap is formed between the support portion and the hanging portion. Alternatively, the screw rod includes a second abutting portion, and when the valve needle and the valve port portion are not abutted, a gap is formed between the second abutting portion and the valve needle, and the support portion and the hanging portion abut against each other; when the second abutting portion abuts against the valve needle, the valve needle and the valve port portion abut against each other, and a gap is formed between the support portion and the hanging portion; Or the valve needle includes the first abutment portion, and the screw rod includes the second abutment portion. When the valve needle abuts against the valve mouth portion, there is a gap between the first abutment portion and the second abutment portion, and the support portion abuts against the suspension portion; when the first abutment portion abuts against the second abutment portion, the valve needle abuts against the valve mouth portion, and there is a gap between the support portion and the suspension portion.

10. The electronic expansion valve according to claim 9, characterized in that: The first abutment portion and the valve needle are an integral structure, or the first abutment portion is fixedly connected or limit-connected or bonded to the valve needle, the first abutment portion is roughly protruding from the valve needle toward the direction away from the valve mouth, the first abutment portion is roughly hemispherical or arc-shaped or angular, and the first abutment portion can abut against the screw rod.

11. The electronic expansion valve according to claim 9, characterized in that: The second abutment portion is an integral structure with the screw rod, or the second abutment portion is fixedly connected, limit-connected or bonded to the screw rod, and the second abutment portion is roughly protruding from the screw rod toward the valve mouth portion. The second abutment portion is roughly hemispherical, arc-shaped or angular, and the second abutment portion can abut against the valve needle.

12. An electronic expansion valve, characterized in that: The valve body comprises a valve body component, a nut component, a screw rod and a valve needle, wherein the valve body component has a valve mouth portion, the screw rod comprises a screw rod threaded portion, the nut component comprises a nut threaded portion, the screw rod threaded portion and the nut threaded portion are threadedly engaged with each other, the valve needle comprises a valve needle guide portion, the valve body component further comprises a valve body guide portion, the valve needle guide portion and the valve body guide portion are slidably engaged with each other, the valve needle can approach or move away from the valve mouth portion, the screw rod comprises a supporting portion, the valve needle further comprises a hanging portion, the supporting portion is closer to the valve mouth portion than the hanging portion, and the supporting portion can abut against the hanging portion; The screw rod has a first slot, the support portion includes a first support portion, the hanging portion includes a first hanging portion, the first hanging portion includes an upper hanging end surface and a lower hanging end surface, and the valve needle extends into the screw rod through the first slot approximately radially, and when the valve needle and the valve mouth portion do not abut against each other, the first support portion abuts against the first hanging portion, and when the valve needle and the valve mouth portion abut against each other, the lower hanging end surface and the first hanging portion have a gap, and the upper hanging end surface and the screw rod have a gap; or the valve needle has a second slot, the support portion includes a second support portion, and the hanging portion includes a second hanging portion, the second support portion includes an upper supporting end surface and a lower supporting end surface, and when the valve needle and the valve mouth portion do not abut against each other, the second support portion abuts against the second hanging portion, and when the valve needle and the valve mouth portion abut against each other, the upper supporting end surface and the second hanging portion have a gap, and the lower supporting end surface and the valve needle have a gap.

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