CN117366325A - Electric valve - Google Patents

Abstract

The invention provides an electric valve capable of suppressing noise while ensuring assemblability. In the electric valve (1), a first silencing member (7) is provided at a position covering a communication passage (411) from the outside of a cylinder part (41) of a main valve element (4), so that the assembly property can be ensured. Further, a flow rate limiting portion (10) for limiting the flow rate of the fluid flowing from the main valve chamber (2R) to the first silencing member (7) is provided outside the first silencing member (7), so that the rise in the flow rate of the fluid can be suppressed, the collapse of bubbles can be suppressed, and noise can be suppressed.

Description

Electric valve

Technical Field

The present invention relates to an electrically operated valve.

Background

Such an electric valve is known, and is generally provided with a main valve element and a sub valve element, and is capable of performing two-stage control, i.e., small flow rate control and large flow rate control. As such an electric valve, a flow rate adjustment valve provided with a silencing member for refining bubbles in a fluid flowing through a small flow rate passage has been proposed (for example, refer to patent document 1). In the flow rate control valve described in patent document 1, noise reduction during fluid passage is achieved by providing a silencing member.

Prior art literature

Patent literature

Patent document 1: japanese patent laid-open publication No. 2017-211032

Disclosure of Invention

Problems to be solved by the invention

However, in the flow rate control valve described in patent document 1, the noise reducing member is fitted into the concave portion of the interlocking member of the valve body and is disposed inside the interlocking member, which has a problem of low assemblability. On the other hand, if the silencing member is disposed outside the valve body, there is a possibility that the silencing effect cannot be sufficiently obtained. Thus, it is difficult to achieve both of the assemblability and the noise reduction effect.

The invention aims to provide an electric valve capable of ensuring assembly and simultaneously inhibiting noise.

Means for solving the problems

The electric valve of the present invention comprises: a valve body that constitutes a main valve chamber and a main valve port; a main valve element that adjusts an opening area between the main valve opening and a main valve seat; and a sub valve body that is provided so as to be movable in an axial direction in a sub valve chamber formed in the main valve body, and that adjusts an opening area between a sub valve port provided in the main valve body and a sub valve seat, wherein the electric valve has a cylinder portion in which a communication passage that communicates the main valve chamber and the sub valve chamber is formed, a silencing member is provided at a position covering the communication passage from outside the cylinder portion, and a flow rate restriction portion that restricts a flow rate of fluid flowing from the main valve chamber to the silencing member is provided outside the silencing member.

According to the present invention as described above, the silencing member is provided outside the cylindrical portion of the main valve body, and thus the assemblability can be ensured. When the fluid passes through the silencer component, the flow rate is throttled, whereby the outlet side (downstream side) pressure of the silencer component becomes lower than the inlet side (upstream side) pressure, and the flow rate rises due to the pressure difference. The flow rate of the fluid flowing into the muffler increases as described above. Therefore, by providing the flow rate limiting portion on the outer side (i.e., the upstream side) of the muffler member, it is possible to suppress an increase in the flow rate of the fluid, suppress the collapse of the air bubbles, and suppress noise.

In this case, in the electric valve according to the present invention, it is preferable that the electric valve further includes a guide member that guides the main valve spool in the axial direction, and the flow rate restriction portion is formed in the guide member. According to this configuration, the flow rate limiting portion can be provided while suppressing an increase in the number of components.

In the electric valve according to the present invention, it is preferable that the electric valve further includes a biasing member that biases the main spool toward the valve closing side in the axial direction, the main spool including: a large diameter portion having a diameter larger than the cylindrical portion and formed on the valve-closing side; and a step portion formed between the cylindrical portion and the large diameter portion, wherein the silencing member is disposed on the step portion, and the biasing force of the biasing member acts on the main valve element via the silencing member. According to this structure, the urging member has two functions, a function of urging the main valve element and a function of holding the silencing member to the outside of the cylinder portion. That is, the number of components can be reduced without requiring additional members for holding the muffler member on the outside of the tube portion.

Effects of the invention

According to the electric valve of the present invention, noise can be suppressed while ensuring assemblability.

Drawings

Fig. 1 is a cross-sectional view showing an electrically operated valve according to an embodiment of the present invention.

Fig. 2 is an enlarged cross-sectional view showing a main part of the above-described electric valve.

Fig. 3 is a side view showing a guide member of the above-described electric valve.

Fig. 4 is a side view showing a guide member of an electrically operated valve according to modification 1 of the present invention.

Fig. 5 is a side view showing a guide member of an electrically operated valve according to modification 2 of the present invention.

Fig. 6 is a side view showing a guide member of an electrically operated valve according to modification 3 of the present invention.

Fig. 7 is an enlarged cross-sectional view showing a main part of an electrically operated valve according to another modification of the present invention.

In the figure:

1-an electric valve; 2-a valve body; 23-a main valve seat; 23 a-main valve port; 2R-main valve chamber; 3-a guide member; 4-a main valve core; 41-a barrel portion; 411-a communication path; 42-large diameter portion; 46-step; 42 a-secondary port; 4R-secondary valve chamber; 5-auxiliary valve core; 7-a first sound attenuating member; 9-a force application spring (force application member); 10-a flow restriction.

Detailed Description

Embodiments of the present invention will be described with reference to the accompanying drawings. The motor-operated valve 1 of the present embodiment is used in, for example, a refrigeration cycle system of an air conditioner such as a cabinet air conditioner or an indoor air conditioner, and includes, as shown in fig. 1, a valve body 2, a guide member 3, a main spool 4, a sub spool 5, a driving portion 6, a first silencing member 7, a second silencing member 8, and a biasing spring 9. The main valve body 4 and the sub valve body 5 are provided so as to move along a predetermined axis direction, and the axis direction is referred to as a Z direction, and two directions orthogonal to the Z direction are referred to as an X direction and a Y direction, and the up and down of the Z direction are based on fig. 1. The lower side in the Z direction is a valve-closing side, and the upper side is a valve-opening side.

The valve body 2 is a valve housing formed of, for example, brass, stainless steel, or the like, and has a main valve chamber 2R on the inner side thereof. The valve body 2 has a first port 21 opening to one side in the X direction and a second port 22 opening to the lower side in the Z direction on its side surfaces. The first port 21 is connected to a first joint pipe 11 extending in the X direction, and the second port 22 is connected to a second joint pipe 12 extending in the Z direction, and the first joint pipe 11 and the second joint pipe 12 communicate with the main valve chamber 2R. The first joint pipe 11 and the second joint pipe 12 may be fixed to the valve body 2 by brazing or the like, for example.

A cylindrical main valve seat 23 protruding toward the main valve chamber 2R (toward the upper side) with the Z direction as the axis direction is formed at the lower end of the valve main body 2, and the inside of the main valve seat 23 serves as a main valve port 23a, and the main valve port 23a communicates with the second port 22. That is, the second joint pipe 12 is in communication with the main valve chamber 2R via the main valve port 23a. In the present embodiment, the electric valve 1 is used such that the fluid (refrigerant) flowing into the main valve chamber 2R from the first joint pipe 11 flows out from the second joint pipe 12 with the first port 21 being the primary side and the second port 22 being the secondary side, but the electric valve 1 may be incorporated in a cycle in which the fluid can flow in both directions.

The guide member 3 is attached to an opening at the upper end of the valve main body 2, and includes: a press-fitting portion 31 that is press-fitted into the inner peripheral surface of the valve main body 2; a substantially cylindrical guide portion 32 located inside the press-fitting portion 31; a bracket portion 33 extending from an upper portion of the guide portion 32; a stopper 34 provided above the holder 33; and an annular flange portion 35 located on the outer periphery of the guide portion 32. The press-fitting portion 31, the guide portion 32, the holder portion 33, and the stopper portion 34 are formed as a single piece made of resin. The flange 35 is made of, for example, a metal plate made of brass, stainless steel, or the like, and the flange 35 is integrally provided with the resin press-fitting portion 31 and the bracket 33 by insert molding.

The guide member 3 is assembled to the valve body 2, and is fixed to the upper end portion of the valve body 2 by welding or the like at the flange portion 35. In the guide member 3, cylindrical guide holes 32a and 32b provided coaxially with the main valve opening 23a with the Z direction as the axis direction are formed in the guide portion 32, and an insertion hole 33a coaxial with the guide holes 32a and 32b is formed in the center of the holder portion 33. Further, a female screw portion (screw hole) 34a coaxial with the guide holes 32a, 32b and the insertion hole 33a is formed in the center of the stopper portion 34.

As also shown in fig. 2, the guide portion 32 includes a first guide hole 32a formed on the valve opening side of the flange portion 35 and a second guide hole 32b formed on the valve closing side of the flange portion 35. The first guide hole 32a is formed in a concave shape to guide a cylinder 41 described later. The second guide hole 32b is formed integrally with the resin portion of the guide member 3, and is formed inside a protruding cylinder 321 extending from the flange portion 35 toward the valve-closing side. The inner diameter of the protruding tube 321 (i.e., the inner diameter of the second guide hole 32 b) is larger than the inner diameter of the first guide hole 32a, and the second guide hole 32b guides a large-diameter portion 42 described later. The guide portion 32 has a spring seat portion 32A, which is a surface facing the valve-closing side, at a position continuous with the valve-closing side with respect to the first guide hole 32A. The upper end of the biasing spring 9 abuts against the spring mount 32A. Thereby, the upper end portion of the biasing spring 9 is supported by the spring support portion 32A.

The main valve spool 4 adjusts the opening area between the main valve port 23a and the main valve seat 23. The main valve body 4 is guided in the Z direction by being disposed in guide holes 32a and 32b of the guide portion 32, and is formed in a cylindrical shape with the Z direction as an axis line direction as a whole. The main valve body 4 integrally includes a tubular portion 41 guided by the first guide hole 32a, a tubular large-diameter portion 42 guided by the second guide hole 32b, a circular plate portion 43 disposed between the tubular portion 41 and the large-diameter portion 42, and a main valve portion 44 provided at a lower end portion of the large-diameter portion 42.

The tube 41 has an auxiliary valve chamber 4R formed inside thereof, and a communication passage 411 as a through hole, and the communication passage 411 communicates the main valve chamber 2R and the auxiliary valve chamber 4R. In the present embodiment, eight communication passages 411 are formed that are arranged at equal intervals in the circumferential direction, and each communication passage 411 extends in the direction along the XY plane. The outer diameter of the tube 41 is equal to or slightly smaller than the inner diameter of the first guide hole 32a. An annular retainer 45 is fixed to the valve-opening-side end of the tube 41 by fitting, welding, or the like. The cylindrical portion 41 also functions as a needle guide by inserting a guide boss 53, which will be described later, fixed to the valve shaft 51 into the inside thereof.

The large diameter portion 42 is continuous with the valve-closing side of the tube portion 41, and is formed to have a larger diameter than the tube portion 41. A stepped portion 46 is formed between the cylindrical portion 41 and the large diameter portion 42. The outer diameter of the large diameter portion 42 is equal to or slightly smaller than the inner diameter of the second guide hole 32b.

The circular plate portion 43 is a bottom portion for the cylindrical portion 41, and is also a bottom portion for the large diameter portion 42. A through-hole-shaped sub valve port 431 is formed in the center of the disk portion 43.

The main valve portion 44 is formed by expanding the diameter of the lower end portion of the tube of the large diameter portion 42, and is provided so as to be seated (abutted) against the main valve seat 23 in the fully closed state.

The sub-valve element 5 is a needle valve provided at a lower end portion of a rotor shaft 61 described later, and integrally includes a valve shaft 51 connected to the rotor shaft 61 side and a valve needle portion 52 connected to a lower end of the valve shaft 51. The sub valve element 5 further includes a guide boss 53 fixed to the valve shaft 51. The guide boss 53 is fixed separately from the valve shaft 51, but the guide boss 53 may be integrally formed with the valve shaft 51. The guide boss 53 is slidably inserted into a needle guide hole formed in the cylinder 41.

The driving unit 6 is provided inside and outside a housing 24 fixed to the upper end of the valve main body 2, and includes a stepping motor 6A, a screw feed mechanism 6B for advancing and retreating the sub-valve body 5 by rotation of the stepping motor 6A, and a stopper mechanism 6C for restricting rotation of the stepping motor 6A. The case 24 is fixed to the valve body 2 in an airtight manner by welding or the like, for example.

The stepping motor 6A is configured by a rotor shaft 61, a magnetic rotor 62 rotatably disposed inside the housing 24, a stator coil 63 disposed opposite to the magnetic rotor 62 on the outer periphery of the housing 24, and other not-shown yokes, exterior members, and the like. The rotor shaft 61 is attached to the center of the magnetic rotor 62 via a bush, and a male screw portion 61a is formed on the outer periphery of the rotor shaft 61 on the guide member 3 side. The male screw portion 61a is screwed with the female screw portion 34a of the guide member 3, whereby the guide member 3 supports the rotor shaft 61 on the axis line along the Z direction. The female screw portion 34a of the guide member 3 and the male screw portion 61a of the rotor shaft 61 constitute a screw feed mechanism 6B.

The first muffler member 7 is formed in a cylindrical shape extending in the Z direction, and is disposed at a position covering the communication passage 411 from the outside of the cylindrical portion 41. The inner peripheral surface of the first muffler member 7 is in contact with a portion other than the communication passage 411 in the outer peripheral surface of the tube portion 41. The valve-closing-side end of the first silencing member 7 abuts against a surface facing the valve opening side of the stepped portion 46 of the main spool 4. The lower end of the biasing spring 9 abuts against the valve-opening-side end of the first muffler member 7. Thus, the first muffler member 7 is biased toward the valve opening side surface of the stepped portion 46 by the lower end portion (valve closing side end portion) of the biasing spring 9. In this way, the biasing spring 9 is disposed between the guide member 3 and the first silencing member 7 and the main valve body 4, and the biasing force of the biasing spring 9 acts on the main valve body 4 via the first silencing member 7. The first silencing member 7 is assembled and held to the main valve element 4 by the biasing force of the biasing spring 9. The holding structure of the first muffler component 7 may be sandwiched by being in direct contact with the biasing spring 9 and the stepped portion 46 as described above, or may be provided with other components therebetween.

The first muffler member 7 is a filter formed by, for example, a linear member randomly bending to form a three-dimensional mesh, and more specifically, a demister is exemplified. The first silencing member 7 formed in a mesh shape in this way functions to thin the flow path, and the fluid (refrigerant) is thinned and passes through the first silencing member 7. That is, when the fluid in the gas-liquid mixed state passes through the first muffler component 7, the bubbles are refined. At this time, since the linear members are bent at random, the first sound-deadening member 7 has a passage area of various sizes as a passage portion through which the fluid can pass. In addition, when the fluid passes through the first muffler component 7 in the predetermined passing direction, the passing area may be changed according to the passing direction position. Thus, bubbles of various sizes are refined.

The second silencing member 8 is disposed inside the cylindrical large-diameter portion 42. Thus, the second silencing member 8 is disposed in the flow path from the sub-valve port 431 to the main valve port 23a, and is disposed downstream of the first silencing member 7 when the first port 21 is the primary side. The second muffler member 8 may be, for example, a three-dimensional mesh filter formed by randomly bending a linear member, as in the first muffler member 7, and more specifically, a demister is exemplified. The first silencing member 7 preferably has a higher density than the second silencing member 8, but the density of the two may be equal, and the density of the second silencing member 8 may be higher than the density of the first silencing member 7. Here, the density means the mass per unit volume, and the higher the density is, the higher the performance of refining bubbles is.

The second silencing member 8 is disposed so as to fit inside the large-diameter portion 42 (to be buried without any gap), and faces the sub-valve port 431 in the Z direction. Thus, when the fluid having passed through the sub-port 431 flows into the main port 23a, the fluid must pass through the second silencing member 8. The second muffler component 8 may be fixed by being swaged to the lower end portion of the large diameter portion 42 via, for example, an annular member.

Here, the opening and closing operations of the main spool 4 and the sub spool 5 in the electric valve 1 will be described in detail. When the magnetic rotor 62 and the rotor shaft 61 are rotated by the driving of the stepping motor 6A, the rotor shaft 61 moves in the Z direction by the screw feed mechanism 6B of the male screw portion 61a of the rotor shaft 61 and the female screw portion 34a of the guide member 3. Thus, the sub valve element 5 moves forward and backward in the Z direction to approach or separate from the sub valve port 431, and the valve opening degree of the sub valve port 431 is controlled (small flow control). The guide boss 53 of the sub valve body 5 engages with the retainer 45, and the main valve body 4 moves together with the sub valve body 5, approaching or separating from the main valve seat 23 (large flow control). Thereby, the flow rate of the refrigerant flowing from the first joint pipe 11 toward the second joint pipe 12 is controlled. In the present embodiment, even in a state where the sub valve body 5 moves forward and backward in the Z direction and is closest to the sub valve seat portion having the sub valve port 431, the sub valve body 5 does not come into contact (seat) with the sub valve seat portion, but a gap is formed between the sub valve body 5 and the sub valve seat portion so that fluid can pass through the sub valve port 431, but the sub valve body 5 may be configured to seat on the sub valve seat portion.

A guide groove 34b having a male screw shape is formed on the outer peripheral surface of the stopper portion 34 of the guide member 3, and a slider 64 is provided in the guide groove 34 b. The slider 64 contacts the magnetic rotor 62, and rotates along the guide groove 34b and moves up and down in accordance with the rotation of the magnetic rotor 62. The slider 64 constitutes a stopper mechanism 6C that restricts the rotation of the magnetic rotor 62 by abutting against the upper end or the lower end of the guide groove 34 b. The position of the rotor shaft 61 and the magnetic rotor 62 at the lowermost end and the uppermost end are regulated by the regulating mechanism 6C.

Next, the shape and positional relationship of the guide member 3, the main valve element 4, and the first silencing member 7 will be described in detail. The following description refers to the positional relationship of the respective parts in the case of small flow control unless otherwise noted. The protruding cylindrical portion 321 of the guide member 3 extends to a position overlapping the large diameter portion 42, and a cutout portion 322 is formed at the lower end portion thereof as shown in fig. 3. The cutout 322 penetrates the protruding tube 321 in the radial direction and opens to the valve-closing side, and the valve-opening side end of the cutout 322 is semicircular as viewed in the radial direction. In the present embodiment, four cutout portions 322 are arranged at equal intervals in the circumferential direction.

An opening through which fluid can pass is formed by the cutout 322 and the outer peripheral surface of the large diameter portion 42 (particularly, the end edge on the valve opening side). By passing the fluid through this opening, the flow rate of the fluid flowing from the main valve chamber 2R into the first silencing member 7 is restricted, and this opening becomes the flow rate restricting portion 10. The flow rate limiting portion 10 is provided outside the first muffler component 7. The total passable area (cross-sectional area of the surface orthogonal to the fluid passing direction) of the four flow rate limiting portions 10 is preferably larger than the total passable area of the eight communication passages 411 (i.e., the total passable area of the eight communication passages 411 is preferably smaller than the total passable area of the four flow rate limiting portions 10). Specifically, the total passable area of the flow rate limiting portion 10 is preferably 1.5 to 2.5 times the total passable area of the communication passage 411, for example. If such a relationship of opening areas is adopted, the flow rate can be further and more effectively decelerated by the (eight) communication passages 411 after the flow rate is decelerated by the (four) flow rate restriction portions 10. That is, the flow rate of the fluid can be gradually reduced by the flow rate limiting portion 10 and the communication passage 411. Therefore, when the fluid flows from the main valve chamber 2R into the sub valve chamber 4R, the rapid change in the flow rate can be further suppressed.

The number of the communication paths 411 and the flow rate limiting portions 10 is not limited to the above (eight and four, respectively) and may be appropriately set. Even when the number of the communication paths 411 and the flow rate limiting portions 10 is different from that described above, the same effects as described above can be obtained when the total passable area of the flow rate limiting portions 10 is larger than the total passable area of the communication paths 411. The total passable area of the flow rate limiting portion 10 may be equal to or smaller than the total passable area of the communication passage 411.

When the fluid passes through the first silencing member 7, the flow rate is throttled, and thus the outlet side pressure of the first silencing member 7 becomes lower than the inlet side pressure, and the flow rate increases due to the pressure difference. At this time, the fluid whose flow rate is restricted by the flow rate restricting portion 10 flows into the first silencing member 7, and thus the increase in flow rate is suppressed, and the collapse of the bubbles is suppressed in the first silencing member 7.

The fluid passes through the first silencing member 7, whereby the bubbles are refined, and the fluid further passes through the communication passage 411. The fluid is throttled by the sub-port 431, and then flows toward the main port 23a by the second silencing member 8. At this time, in the case where the density of the second sound-deadening member 8 is lower than that of the first sound-deadening member 7, the fluid is hard to be trapped in the second sound-deadening member 8.

According to the present embodiment described above, the first silencing member 7 is provided outside the tubular portion 41 of the main valve element 4, so that the assemblability can be ensured. Further, by providing the flow rate limiting portion 10 outside the first muffler component 7, the rise in the flow rate of the fluid can be suppressed, and the collapse of the bubbles can be suppressed, thereby suppressing noise.

In addition, since the flow rate limiting portion 10 is formed by the cutout portion 322 of the guide member 3, an increase in the number of components can be suppressed as compared with a configuration in which a dedicated member is added and the flow rate limiting portion is provided.

The first silencing member 7 is disposed in the stepped portion 46, and the urging force of the urging spring 9 acts on the main valve body 4 via the first silencing member 7, whereby the urging spring 9 has both a function of urging the main valve body 4 and a function of holding the first silencing member 7 outside the tubular portion 41. That is, the number of components can be reduced without requiring additional components for holding the first muffler component 7 on the outside of the tube 41.

The present invention is not limited to the above-described embodiments, and other configurations and the like capable of achieving the objects of the present invention are included in the present invention, as are modifications and the like shown below. For example, in the above-described embodiment, the flow rate limiting portion 10 is formed by the cutout portion 322 of the guide member 3, but the structure for forming the flow rate limiting portion is not limited thereto, and may be the following modifications 1 to 3.

In modification 1 shown in fig. 4, the cutout 323 formed in the protruding cylindrical portion 321 is rectangular in shape as viewed in the radial direction, and the valve-closing side opening is similar to the above embodiment. The flow rate restricting portion is formed by such a cutout portion 323.

In modification 2 shown in fig. 5, a through hole 324 is formed in the protruding tubular portion 321. That is, the through hole 324 is not opened to the valve closing side. The through-hole 324 may be formed in a circular shape and may be disposed so as not to overlap the large diameter portion 42 during the small flow rate control.

In modification 3 shown in fig. 6, a through hole 325 is formed in the protruding cylindrical portion 321. That is, the through hole 325 is not opened to the valve-closing side. The through hole 325 may be formed in a rectangular shape (particularly, a square shape) and may be disposed so as not to overlap the large diameter portion 42 during the small flow rate control.

In addition, the flow rate restricting portion may not be formed in the guide member, that is, may be formed by a member separate from the guide member. According to this configuration, the flow rate limiting portion can be provided in the conventional-shaped electric valve, and the design can be easily carried out. In addition, the degree of freedom in the arrangement of the flow rate limiting portion can be improved.

In the above embodiment, the first silencing member 7 is disposed in the stepped portion 46, and the urging force of the urging spring 9 acts on the main valve body 4 via the first silencing member 7, but the mode for holding the silencing member is not limited thereto. For example, as shown in fig. 7, a recess 47 may be formed on the outer side of the communication passage 411 in the main valve element 4B, and the first silencing member 7 may be held by fitting the first silencing member 7 into the recess 47. At this time, the biasing member for biasing the main spool 4B toward the valve closing side may be directly or indirectly brought into contact with the main spool 4B, or the biasing member may not be provided.

In the embodiment shown in fig. 7, the communication passage 411 also serves as the sub-valve port, but the communication passage and the sub-valve port may be formed independently as in the above embodiment. The structure for forming the flow rate limiting portion 10 is not limited to the cutout portion 322.

Although the embodiments of the present invention have been described in detail with reference to the drawings, specific configurations are not limited to these embodiments, and design changes and the like that do not depart from the gist of the present invention are also included in the present invention.

Claims (3)

1. An electrically operated valve, comprising:

a valve body that constitutes a main valve chamber and a main valve port;

a main valve element that adjusts an opening area between the main valve opening and a main valve seat; and

a sub valve body provided so as to be movable in an axial direction in a sub valve chamber formed in the main valve body, and adjusting an opening area between a sub valve port provided in the main valve body and a sub valve seat,

the electric valve is characterized in that,

the main valve core has a cylinder portion formed with a communication path for communicating the main valve chamber with the auxiliary valve chamber,

a silencing member is provided at a position covering the communication path from the outside of the tube portion,

a flow rate limiting portion is provided on the outer side of the silencing member, and limits the flow rate of the fluid flowing from the main valve chamber to the silencing member.

2. The electrically operated valve as set forth in claim 1, wherein,

comprises a guide member for guiding the main valve element in the axial direction,

the flow rate limiting portion is formed on the guide member.

3. An electrically operated valve as claimed in claim 1 or 2, characterized in that,

the valve body is provided with a biasing member for biasing the main valve element toward the valve closing side in the axial direction,

the main valve core has: a large diameter portion having a diameter larger than the cylindrical portion and formed on the valve-closing side; and a step portion formed between the cylindrical portion and the large diameter portion,

the silencing member is disposed in the step portion, and the biasing force of the biasing member acts on the main valve element through the silencing member.