Patent Description:
Currently, there is a strong refrigerant sound during the using process of electronic expansion valves. When using such electronic expansion valves, air conditioner manufacturers usually need to add transition tubes or capillary tubes before and after throttling. On the one hand, the noise reduction effect is not obvious and the means is not universal. On the other hand, the pipeline becomes more complicate, the space occupied by the pipeline becomes wider, the number of solder joints increases, and the risk of leakage increases. In addition, it will decrease the production efficiency and increase the manufacturing cost. Therefore, it is necessary to optimize the structure of the electronic expansion valve.

Prior art document <CIT> discloses a flow control valve that includes a valve body including a valve chamber and a valve orifice; and a valve element with a curved surface portion adapted to change the flow rate of a fluid through the valve orifice in accordance with the lift amount of the valve element, the curved surface portion having a curvature or a control angle that is increased continuously or in stages toward the tip end of the curved surface portion. The orifice diameter of the valve orifice is sequentially increased in three or more stages in a direction away from the valve chamber.

The main objective of the present disclosure is to provide an electronic expansion valve, a refrigerant circulation line and an air conditioner system, aiming to optimize the structure of the electronic expansion valve and achieve a lower refrigerant sound.

In order to achieve the above objective, the present invention provides an electronic expansion valve. The electronic expansion valve comprises a valve seat and a valve needle assembly. The valve seat is formed with a main valve cavity. The valve needle assembly comprises a valve needle sleeve provided inside the main valve cavity. The valve needle sleeve is formed with a needle sleeve cavity and an end wall of the needle sleeve cavity is defined with a main valve port. The main valve port comprises a first deflector hole section, a second deflector hole section and a rectification hole section. The first deflector hole section and the second deflector hole section are distributed along a direction towards an outside of the main valve port. The rectification hole section is provided between the first deflector hole section and the second deflector hole section. The rectification hole section is connected with the first deflector hole section. A hole diameter of the rectification hole section is larger than a hole diameter of the first deflector hole section, so as to form a step between the rectification hole section and an inner wall of the first deflector hole section. The valve needle assembly further comprises a valve needle provided inside the valve needle sleeve and a tip portion of the valve needle is at least partially provided inside the main valve port. L represents a distance between an end face of the tip portion and a bottom wall of the needle sleeve cavity, L<NUM> represents a length of the first deflector hole section, L<NUM> represents a length of the rectification hole section and L<NUM> represents a length of the second deflector hole section. L is not less than L<NUM>+L<NUM>+L<NUM> and not greater than <NUM>(L<NUM>+L<NUM>+L<NUM>).

In an embodiment, D represents the hole diameter of the first deflector hole section and D<NUM> represents the hole diameter of the rectification hole section. D<NUM>/D is not less than <NUM>.

In an embodiment, an end of the valve needle sleeve forming the main valve port protrudes outwardly from the main valve cavity to form a protruding portion. The electronic expansion valve further comprises a standpipe and an end of the standpipe sleeves externally on the protruding portion. DL represents an inner diameter of the standpipe and D<NUM> represents an inner diameter of an end of the main valve port. (DL-D<NUM>)/D<NUM> is not less than <NUM> and not greater than <NUM>.

In an embodiment, D<NUM> represents the hole diameter of the rectification hole section. D<NUM>/D<NUM> is not less than <NUM> and not greater than <NUM>.

In an embodiment, a lateral surface of the protruding portion is shaped like a step. Along the direction towards the outside of the main valve port, the protruding portion comprises a first protruding section with a larger hole diameter and a second protruding section with a smaller hole diameter sequentially connected. The standpipe sleeves externally on the first protruding section and a liquid-standing gap is formed between the second protruding section and the standpipe.

In an embodiment, an inner diameter of the second deflector hole section gradually increases along the direction towards the outside of the main valve port. A lateral surface of an end of the second deflector hole section is connected with an inner wall of the second protruding section.

In an embodiment, L<NUM> represents a length of the first protruding section and L<NUM> represents a length of the second protruding section. L<NUM>/L<NUM> is not less than <NUM> and not greater than <NUM>.

In an embodiment, L<NUM> represents a length of the rectification hole section and L<NUM> represents a length of the second deflector hole section. (L<NUM>+L<NUM>)/(L<NUM>+L<NUM>) is not less than <NUM> and not greater than <NUM>.

In an embodiment, an inner sidewall of the needle sleeve cavity is provided with a main overflow hole communicated with the main valve cavity.

In an embodiment, the electronic expansion valve further comprises a traverse pipe communicated with the main valve cavity. The traverse pipe extends along a radial direction of the valve needle sleeve and the main overflow hole is staggered with the traverse pipe along the direction towards the outside of the main valve port.

In an embodiment, β represents an comprised angle between a centerline of the main overflow hole and a radial plane of the valve needle sleeve. β is not less than <NUM>° and not greater than <NUM>°.

In an embodiment, DS represents an inner diameter of the needle sleeve cavity and d represents a hole diameter of the main overflow hole. d is greater than <NUM> and less than <NUM>.

In an embodiment, a plurality of the main overflow holes are spaced along a circumference of the main valve cavity.

In an embodiment, the valve needle assembly further comprises a valve needle provided inside the valve needle sleeve. The valve needle comprises a moving portion and a tip portion. The moving portion is hermetically sealed with and slidably mounted inside the valve needle sleeve. The tip portion is connected with the moving portion and at least partially provided inside the main valve port. The moving portion comprises a covering section at least partially covering the main overflow hole. At least the covering section of the moving portion is provided in a decreased size, so as to form an annular communicating cavity communicated with the main overflow hole between the covering section and the valve needle sleeve.

In an embodiment, Df2 represents an outer diameter of the covering section and DS represents an inner diameter of the needle sleeve cavity. Df2/DS is greater than <NUM> and less than <NUM>.

In an embodiment, Lp represents a distance between an end face of the covering section away from the main valve port and an end face of the valve needle sleeve away from the main valve port. Lp/DS is not less than <NUM> and not greater than <NUM>.

In an embodiment, the valve needle assembly comprises a valve needle provided inside the valve needle sleeve. The valve needle is movable along a length direction of the valve needle sleeve for adjustment, and a tip portion of the valve needle is provided at least partially inside the main valve port.

The present invention further provides a refrigerant circulation line. The refrigerant circulation line comprises an electronic expansion valve according to the invention.

The present invention further provides an air conditioner system. The air conditioner system comprises a refrigerant circulation line. The refrigerant circulation line comprises an electronic expansion valve according to the invention.

In those technical solutions provided by the disclosure, the valve seat is formed with a main valve cavity. An end wall of the needle sleeve cavity is defined with a main valve port. The main valve port comprises a first deflector hole section, a second deflector hole section and a rectification hole section. The first deflector hole section and the second deflector hole section are distributed along a direction towards an outside of the main valve port. The rectification hole section is provided between the first deflector hole section and the second deflector hole section. The rectification hole section and an inner wall of the first deflector hole section cooperatively form a step. When the electronic expansion valve is working, the refrigerant passes through the rectification hole section. Meanwhile, the turbulence will be formed at a location of the rectification hole section corresponding to the step. The turbulence may guide the refrigerant at the central position of main valve port to flow to play a flexible guide effect, thereby improving the flowing state of the refrigerant at the main valve port and effectively reducing the refrigerant noise.

In order to more clearly illustrate the embodiments of the present disclosure, drawings used in the embodiments will be briefly described below. Obviously, the drawings in the following description are only some embodiments of the present disclosure. It will be apparent to those skilled in the art that other figures can be obtained according to the structures shown in the drawings without creative work.

The realization of the objective, functional characteristics, and advantages of the present disclosure are further described with reference to the accompanying drawings.

The technical solutions of embodiments of the present invention will be clearly and completely described with reference to the drawings of the present disclosure. Obviously, the described embodiments are only some rather than all of the embodiments of the present disclosure.

It should be noted that all directional indicators (such as up, down, left, right, front, rear, etc.) in the embodiments of the present disclosure are only used to explain the relative positional relationship, movement situation, etc. among components in a specific attitude (as shown in the drawings). If the specific attitude changes, the directional indication also changes accordingly.

In addition, the descriptions related to "first", "second" and the like in the present disclosure are merely for descriptive purposes, and should not be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined by "first" and "second" may explicitly or implicitly include at least one such feature. Besides, the various embodiments can be combined with each other, but the combination must be based on what can be achieved by those skilled in the art. When the combination of the embodiments is contradictory or cannot be achieved, it should be considered that such combination does not exist, or is not within the scope of the present disclosure.

In view of this, the present disclosure provides an electronic expansion valve <NUM>. <FIG> are schematic views of electronic expansion valve <NUM> according to some embodiments of the present disclosure.

As shown in <FIG>, the electronic expansion valve <NUM> comprises a valve seat <NUM> and a valve needle assembly <NUM>. The valve seat <NUM> is formed with a main valve cavity <NUM> and the valve needle assembly <NUM> comprises a valve needle sleeve <NUM> provided inside the main valve cavity <NUM>. The valve needle sleeve <NUM> is formed with a needle sleeve cavity <NUM> and an end wall of the needle sleeve cavity <NUM> is defined with a main valve port <NUM>. The main valve port <NUM> comprises a first deflector hole section <NUM>, a second deflector hole section <NUM> and a rectification hole section <NUM>. The first deflector hole section <NUM> and the second deflector hole section <NUM> are distributed along a direction towards an outside of the main valve port <NUM> and the rectification hole section <NUM> is provided between the first deflector hole section <NUM> and the second deflector hole section <NUM>. The rectification hole section <NUM> is connected with the first deflector hole section <NUM>. In addition, the hole diameter of the rectification hole section <NUM> is larger than the hole diameter of the first deflector hole section <NUM> to make the rectification hole section <NUM> and an inner wall of the first deflector hole section <NUM> cooperatively form a step.

In the technical solutions of the disclosure, the valve seat <NUM> is formed with a main valve cavity <NUM> and the valve needle assembly <NUM> comprises a valve needle sleeve <NUM> provided inside the main valve cavity <NUM>. The valve needle sleeve <NUM> is formed with a needle sleeve cavity <NUM> and an end wall of the needle sleeve cavity <NUM> is defined with a main valve port <NUM>. The main valve port <NUM> comprises a first deflector hole section <NUM>, a second deflector hole section <NUM> and a rectification hole section <NUM>. The first deflector hole section <NUM> and the second deflector hole section <NUM> are distributed along a direction towards an outside of the main valve port <NUM> and the rectification hole section <NUM> is provided between the first deflector hole section <NUM> and the second deflector hole section <NUM>. The rectification hole section <NUM> is connected with the first deflector hole section <NUM>. In addition, the hole diameter of the rectification hole section <NUM> is larger than the hole diameter of the first deflector hole section <NUM> to make the rectification hole section <NUM> and an inner wall of the first deflector hole section <NUM> cooperatively form a step. When the electronic expansion valve <NUM> is working, the refrigerant passes through the rectification hole section <NUM>. Meanwhile, the turbulence will be formed at a location of the rectification hole section <NUM> corresponding to the step. The turbulence may guide the refrigerant at the central position of main valve port <NUM> to flow to play a flexible guide effect, thereby improving the flowing state of the refrigerant at the main valve port <NUM> and effectively reducing the refrigerant noise.

It should be noted that the valve needle assembly <NUM> comprises a valve needle <NUM> provided inside the valve needle sleeve <NUM>. The valve needle <NUM> is adjustable to move along a length direction of the valve needle sleeve <NUM> and a tip portion <NUM> of the valve needle <NUM> is provided at least partially inside the main valve port <NUM>. By controlling the movement of the valve needle <NUM> along the length direction of the valve needle sleeve <NUM>, the gap between the needle sleeve cavity <NUM> and the main valve port <NUM> is adjusted to intercommunicate the main valve cavity <NUM> and the main valve port <NUM>, thereby changing the pressure of the liquid in the main valve cavity <NUM> and the main valve port <NUM>.

In addition, the electronic expansion valve <NUM> also comprises a driving mechanism for driving the valve needle <NUM>. The driving mechanism comprises a rotor member, a stator member, a thread driving member, and a stop member. The above structures cooperate with each other to realize the movement of the valve needle <NUM> along the length direction of the valve needle sleeve <NUM>. It should be noted that the driving mechanism is applied in the electronic expansion valve <NUM> in the prior art, which will not be described in detail here. In addition, the entire sealing structure of the electronic expansion valve <NUM> is also applied in the electronic expansion valve <NUM> in the prior art, and will not be described in detail here.

In the flowing path of the electronic expansion valve <NUM>, the liquid flows in from or out to the side of the electronic expansion valve <NUM>, that is, the liquid flows in or out along a axial direction. In order to reduce the refrigerant noise made in the entire flowing path, in the embodiment of the present disclosure, improvements are made to the relevant structures on the horizontal flowing path, and also to the relevant structures on the vertical flowing path.

As for the structural improvement on the vertical flowing path, it is mainly to optimize the structure of the main valve port <NUM>. As mentioned above, a rectification hole section <NUM> is added between the first deflector hole section <NUM> and the second deflector hole section <NUM>, thereby flexibly guiding the liquid, improving the flowing state of the refrigerant at the main valve port <NUM>, and effectively reducing the noise of the refrigerant. It should be noted that the number of the rectification hole sections <NUM> may be one, two or more, which is not limited.

The following will only illustrate the embodiments with one rectification hole section <NUM>. The refrigerant noise is affected by the size relationship among every hole section of the main valve port <NUM>. In an embodiment, D represents the hole diameter of the first deflector hole section <NUM> and D<NUM> represents the hole diameter of the rectification hole section <NUM>, and D<NUM>/D is not less than <NUM>. On the one hand, the flowing of the refrigerant should be fully considered. On the other hand, the turbulence will be formed at a location of the rectification hole section <NUM> corresponding to the step. Taking the above factors into consideration, when D<NUM>/D is not less than <NUM>, the noise of the refrigerant can be significantly reduced, which has a good effect.

The valve needle <NUM> limits the middle segment shape of the fluid flowing in from or out to the main valve port <NUM>, and the inner side wall of the main valve port <NUM> limits the edge segment shape of the fluid flowing in from or out to the main valve port <NUM>. Both of the above two have a great influence on the flowing of refrigerant. In an embodiment, the valve needle assembly <NUM> further comprises a valve needle <NUM> provided inside the valve needle sleeve <NUM>. The tip portion <NUM> of the valve needle <NUM> is at least partially provided inside the main valve port <NUM>. L represents a distance between an end face of the tip portion <NUM> and a bottom wall of the needle sleeve cavity <NUM>; L<NUM> represents a length of the first deflector hole section <NUM>; L<NUM> represents a length of the rectification hole section <NUM>; and L<NUM> represents a length of the second deflector hole section <NUM>, and L is not less than L<NUM>+L<NUM>+L<NUM> and not greater than <NUM>(L<NUM>+L<NUM>+L<NUM>). If the length of the tip portion <NUM> of the valve needle <NUM> is too short, it would not provide a good flow guiding effect. If the length of the tip portion <NUM> of the valve needle <NUM> is too long, the processing would become more difficult and the processing cost would increase.

In an embodiment, an end forming the main valve port <NUM> of the valve needle sleeve <NUM> protrudes outwardly from the main valve cavity <NUM> to form a protruding portion <NUM>. The electronic expansion valve <NUM> further comprises a standpipe <NUM> and an end of the standpipe <NUM> sleeve externally on the protruding portion <NUM>. DL represents an inner diameter of the standpipe <NUM> and D<NUM> represents an inner diameter of an end of the main valve port <NUM>, and (DL-D<NUM>)/D<NUM> is not less than <NUM> and not greater than <NUM>. If the ratio is too small, the guiding effect will not be achieved. If the ratio is too large, the guiding effect will be too strong, and a strong secondary flow will be formed before the second shrinkage guiding section. When (DL-D<NUM>)/D<NUM> is not less than <NUM> and not greater than <NUM>, it can not only play a better guiding role, but also weaken the secondary flow, thereby achieving a good flow guiding effect.

In an embodiment, D<NUM> represents the hole diameter of the rectification hole section <NUM> and D<NUM>/D<NUM> is not less than <NUM> and not greater than <NUM>. Within this range, the refrigerant diversion between the second deflector hole section <NUM> and the rectification hole section <NUM> is stable.

As shown from <FIG>, there are some schematic structural views according to a second embodiment of the present disclosure. In the embodiment, a lateral surface of the protruding portion <NUM> is shaped like a step. The protruding portion <NUM> comprises a first protruding section <NUM> with a larger hole diameter and a second protruding section <NUM> with a smaller hole diameter sequentially connected along the direction towards the outside of the main valve port <NUM>. The standpipe <NUM> sleeves externally on the first protruding section <NUM> and a liquid-standing gap <NUM> is formed between the second protruding section <NUM> and the standpipe <NUM>. At this time, the refrigerant in the liquid-standing gap <NUM> may guide the refrigerant flowing through the inner wall of the standpipe <NUM> to flow to play a flexible guide effect, thereby improving the flowing state of the refrigerant at the main valve port <NUM>, reducing the friction between the refrigerant and the protruding portion <NUM> and effectively reducing the refrigerant noise of the electronic expansion valve <NUM>.

In addition, in an embodiments, along the direction towards the outside of the main valve port <NUM>, an inner diameter of the second deflector hole section <NUM> is configured to gradually increase, and a lateral surface of an end of the second deflector hole section <NUM> is connected with an inner wall of the second protruding section <NUM>. In this way, it further reduce the friction between the refrigerant and the protruding portion <NUM>, thereby effectively reducing the refrigerant noise of the electronic expansion valve <NUM>.

The size of the liquid-standing gap <NUM> is a factor that affects the refrigerant noise. In an embodiment, L<NUM> represents a length of the first protruding section <NUM> and L<NUM> represents a length of the second protruding section <NUM>, and L<NUM>/L<NUM> is not less than <NUM> and not greater than <NUM>. Within this size relationship range, the refrigerant noise of the electronic expansion valve <NUM> is reduced obviously, thereby having a better effect.

Moreover, a size relationship between the inner wall of the main valve port <NUM> and the lateral surface of the protruding portion <NUM> also affects the refrigerant sound. In an embodiment, L<NUM> represents a length of the rectification hole section <NUM> and L<NUM> represents a length of the second deflector hole section <NUM>, and (L<NUM>+L<NUM>)/(L<NUM>+L<NUM>) is not less than <NUM> and not greater than <NUM>. Within this size relationship range, the refrigerant noise of the electronic expansion valve <NUM> is reduced obviously, thereby having a better effect.

An inner sidewall of the needle sleeve cavity <NUM> is provided with a main overflow hole <NUM> communicated with the main valve cavity <NUM>. The needle sleeve cavity <NUM> is communicated with the main valve cavity <NUM> via the main overflow hole <NUM>. In an embodiment, the electronic expansion valve <NUM> further comprises a traverse pipe <NUM> communicated with the main valve cavity <NUM>. The traverse pipe <NUM> extends along a radial direction of the valve needle sleeve <NUM>, and the main overflow hole <NUM> is staggered with the traverse pipe <NUM> along the direction towards the outside of the main valve port <NUM>. In this way, the influence exerted by the impact energy of the refrigerant on the flowing of the refrigerant is reduced, which result in that the refrigerant is imported from the traverse pipe <NUM>. After the refrigerant filling the main valve cavity <NUM>, the refrigerant enters into the needle sleeve cavity <NUM> through the main overflow hole <NUM>. In another way, the refrigerant enters into the main valve cavity <NUM> from the needle sleeve cavity <NUM>, fills the main valve cavity <NUM>, and then is exported to the traverse pipe <NUM>, which may reduce the flow rate of the refrigerant which exerts impact to valve needle <NUM>, thereby improving the reliability and durability.

It should be noted that the number of the main overflow holes <NUM> may be plural and a plurality of the main overflow holes <NUM> are spaced along a circumference of the main valve cavity <NUM>, which may ensure the fluidity of the refrigerant between the main valve cavity <NUM> and the needle sleeve cavity <NUM>.

In order to avoid the direct impact of the refrigerant on the valve needle <NUM> and the abnormal refrigerant sound caused, in an embodiment, β represents an comprised angle between a centerline of the main overflow hole <NUM> and a radial plane of the valve needle sleeve <NUM>, and β is not less than <NUM>° and not greater than <NUM>°. A better value is that β is equal to <NUM>°. In this way, the flow rate of the refrigerant is ensured, and at the same time, the direct impact of the refrigerant on the valve needle <NUM> is reduced as much as possible, which may further reduce the noise of the refrigerant.

In an embodiment, DS represents an inner diameter of the needle sleeve cavity <NUM> and d represents a hole diameter of the main overflow hole <NUM>, d is greater than <NUM> and less than <NUM>. Within the range of this size relationship, the noise of the refrigerant can be significantly reduced, which has a good effect. In addition, the lower edge of the main overflow hole <NUM> can be provided at the position adjacent to the bottom wall of the main valve cavity <NUM>.

In order to reduce the shaking between the valve needle sleeve <NUM> and the valve sleeve, the gap between the two is very small. However, after the overflow hole is enlarged, the valve needle sleeve <NUM> will block a part of the overflow hole in the fully closed state, resulting in obstruction of the flowing. In an embodiment, the valve needle assembly <NUM> further comprises a valve needle <NUM> provided inside the valve needle sleeve <NUM>. The valve needle <NUM> comprises a moving portion <NUM> hermetically sealed with and slidably mounted inside the valve needle sleeve <NUM> and a tip portion <NUM> connected with the moving portion <NUM> and at least partially provided inside the main valve port <NUM>. The moving portion <NUM> comprises a covering section <NUM> at least partially covering the main overflow hole <NUM>, and at least the covering section <NUM> of the moving portion <NUM> is provided in a decreased size, so as to form an annular communicating cavity <NUM> communicated with the main overflow hole <NUM> between the covering section <NUM> and the valve needle sleeve <NUM>. The covered part of the main overflow hole <NUM> is communicated by the annular communicating cavity <NUM>, thereby reducing the influence on the refrigerant and improving the efficiency of the electronic expansion valve <NUM>.

In an embodiment, Df2 represents an outer diameter of the covering section <NUM> and DS represents an inner diameter of the needle sleeve cavity <NUM>, and Df2/DS is greater than <NUM> and less than <NUM>. Within the range of this size relationship, the flowing state of the refrigerant is improved.

In an embodiment, Lp represents a distance between an end face of the covering section <NUM> away from the main valve port <NUM> and an end face of the valve needle sleeve <NUM> away from the main valve port <NUM>, and Lp/DS is not less than <NUM> and not greater than <NUM>. In this way, the vibration of the valve needle <NUM> caused by the impact of the refrigerant is reduced, and the noise of the refrigerant of the electronic expansion valve <NUM> is significantly improved, which has a good effect.

The present disclosure further provides a refrigerant circulation line. The refrigerant circulation line comprises an electronic expansion valve. The refrigerant circulation line comprises all technical solutions of the electronic expansion valve above-mentioned. Thus, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

The present disclosure further provides an air conditioner system. The air conditioner system comprises a refrigerant circulation line. The refrigerant circulation line comprises an electronic expansion valve. The air conditioner system comprises all technical solutions of the refrigerant circulation line above-mentioned. Thus, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

Claim 1:
An electronic expansion valve (<NUM>), comprising:
a valve seat (<NUM>) formed with a main valve cavity (<NUM>); and
a valve needle assembly (<NUM>) comprising a valve needle sleeve (<NUM>) provided inside the main valve cavity (<NUM>),
wherein the valve needle sleeve (<NUM>) is formed with a needle sleeve cavity (<NUM>) and an end wall of the needle sleeve cavity (<NUM>) is defined with a main valve port (<NUM>),
the main valve port (<NUM>) comprises:
a first deflector hole section (<NUM>);
a second deflector hole section (<NUM>), wherein the first deflector hole section (<NUM>) and the second deflector hole section (<NUM>) being distributed along a direction towards an outside of the main valve port (<NUM>); and
a rectification hole section (<NUM>) provided between the first deflector hole section (<NUM>) and the second deflector hole section (<NUM>), wherein the rectification hole section (<NUM>) being connected with the first deflector hole section (<NUM>), and
wherein a hole diameter of the rectification hole section (<NUM>) is larger than a hole diameter of the first deflector hole section (<NUM>), so as to form a step between the rectification hole section (<NUM>) and an inner wall of the first deflector hole section (<NUM>),
wherein the valve needle assembly (<NUM>) further comprises a valve needle (<NUM>) provided inside the valve needle sleeve (<NUM>),
a tip portion (<NUM>) of the valve needle (<NUM>) is at least partially provided inside the main valve port (<NUM>),
characterized in that,
L represents a distance between an end face of the tip portion (<NUM>) and a bottom wall of the needle sleeve cavity (<NUM>); L<NUM> represents a length of the first deflector hole section (<NUM>); L<NUM> represents a length of the rectification hole section (<NUM>); and L<NUM> represents a length of the second deflector hole section (<NUM>), and
L is not less than L<NUM>+L<NUM>+L<NUM> and not greater than <NUM>(L<NUM>+L<NUM>+L<NUM>).