Motorized valve

Abstract

A motorized valve 11 comprising: a valve body 12 that has therein a valve chamber 13 communicating with an inflow path 15 and an outflow path 16; a valve element 17 that advances towards and recedes from a valve seat 14; a can 40 that accommodates a rotor 43 included in an electric motor 41 which drives the valve element; and a connection member 21 that connects the can and the valve body, wherein the valve body has a connection opening 19 into which the connection member is fitted, the connection opening has a step part 19b capable of abutting the connection member when said member is fited into the connection opening, the connection member has a tubular fit-in part 22a that is fitted into the connection opening and a flange part 23 that is bent from a bottom end part of the fit-in part toward the center of the connection member, the fit-in part has an external thread 25 on the outer peripheral surface thereof which is threaded to an internal thread 19a formed in the inner peripheral surface of the connection opening, and a base-end part of the flange part abuts the step part when the fit-in part is fitted into the connection opening.

Description

Electric valve

[0001] The present invention relates to an electric valve, and more particularly to the structure of a connecting member that connects a valve body and a can (a sealed container that houses a rotor of an electric motor).

[0002] BACKGROUND ART Electric valves that use an electric motor such as a stepping motor to control the valve opening have conventionally been used in refrigeration cycle devices equipped with a refrigerant circuit, such as air conditioners and refrigerators / freezers.

[0003] 6 and 7 show an example of such an electrically operated valve (FIG. 7 is an enlarged view of portion B2 in FIG. 6). As shown in these figures, a conventional electrically operated valve comprises a valve body 12 having an internal valve chamber 13 and flow paths (inflow path 15 and outflow path 16) for allowing refrigerant to flow in and out of the valve chamber 13, a valve seat 14 formed at the opening of the inflow path 15 to the valve chamber 13, a valve element 17 that moves toward and away from the valve seat 14 (up and down) to change the amount of refrigerant passing through (flow rate), an electric motor 41 that drives the valve element 17, a speed reduction mechanism 56 that reduces the rotation of the electric motor 41, a transmission mechanism 33 that converts the reduced rotational motion into linear motion and transmits it to the valve element 17, a can (sealed container) 40 that forms a sealed space above the top surface of the valve body 12 and accommodates a rotor 43 of the electric motor 41, the speed reduction mechanism 56, and the transmission mechanism 33 in this sealed space, and a connecting member 63 that connects the valve body 12 to the can 40.

[0004] The connecting member 63 is a cylindrical member with no bottom or lid (both the top and bottom are open) and has a male thread 25 on its outer circumferential surface. Meanwhile, a connecting opening 19, into which the connecting member 63 is fitted, is drilled in the top surface of the valve body 12, and a female thread 19a is formed on the inner circumferential surface of this connecting opening 19 to threadably engage with the male thread 25 of the connecting member 63. The bottom surface of the connecting opening 19 is provided with a step 19b against which the connecting member 63 can abut when fitted in. The connecting member 63 is attached to the valve body 12 by screwing the connecting member 63 into the connecting opening 19 until the bottom of the connecting member 63 abuts against the step 19b and then tightening.

[0005] Furthermore, in order to prevent refrigerant from leaking to the outside through the connection opening 19 communicating with the valve chamber 13, a seal member (O-ring) 28 is provided in the connection opening 19 so as to be interposed between the outer peripheral surface of the connection member 63 and the valve body 12 (the inner peripheral surface of the connection opening 19). In addition, a protrusion 24 that protrudes horizontally outward is formed on the top surface of the connection member 63, and the can 40 is joined to this protrusion 24 by welding.

[0006] Further, the following Patent Document 1 discloses such an electrically operated valve.

[0007] Patent Document 1: JP 2021-110409 A

[0008] However, there is still room for improvement in the connecting member 63 of the conventional motor-operated valve.

[0009] Specifically, as described above, the connecting member 63 is attached by screwing it into the connecting opening 19 of the valve body 12. However, if excessive torque is applied to the connecting member 63 during the tightening operation of the connecting member 63, the axial force may cause deformation of the connecting member 63 or damage to the threaded portion (the male thread 25 formed on the outer peripheral surface).

[0010] Such deformation or damage can reduce the connection strength of the connecting member 63 to the valve body 12, thereby impairing the durability of the electric valve, or can reduce the sealing ability of the sealing member 28, resulting in refrigerant leakage.

[0011] Furthermore, the above-mentioned problems cannot be solved by the invention described in Patent Document 1.

[0012] Therefore, the object of the present invention is to obtain a new connecting member structure that does not (or is less likely to) cause deformation of the member or damage to the threaded portion even if excessive torque is applied to the connecting member during installation work.

[0013] To solve the above problems and achieve the object, the present invention provides a motor-operated valve including a valve body having an internal valve chamber communicating with an inlet passage and an outlet passage, a valve element that moves toward and away from a valve seat formed in the valve chamber, a can that rotatably houses a rotor included in an electric motor that drives the valve element, and a connecting member that connects the can to the valve body. The valve body also has a connection opening on its top surface into which the connecting member can be fitted. The connection opening also has a stepped portion on its bottom surface against which the connecting member can abut when fitted into the connection opening. The connecting member also has a tubular fitting portion that fits into the connection opening and a flange portion that is bent from the bottom end of the fitting portion toward the center of the connecting member. The fitting portion also has a male thread on its outer surface that threads into a female thread formed on the inner surface of the connection opening, so that the base end of the flange abuts against the stepped portion when the fitting portion is fitted into the connection opening.

[0014] The "base end" is the outermost part of the flange, in other words, the part farthest from the central axis of the connecting member, and is the part that connects to (adjacent to) the tubular fitting portion. In other words, the "base end" is the part that is closest to the fitting portion (the part located approximately directly below the fitting portion) when viewed from the axial direction of the connecting member.

[0015] Furthermore, the motor-operated valve typically includes a ring-shaped seal member in the connection opening so as to be interposed between the fitting portion and the valve body.

[0016] In the conventional motor-operated valve (FIGS. 6 and 7), the connecting member (particularly the fitting portion that is fitted into the connecting opening) has a simple cylindrical shape, and its lower end abuts against a step formed in the connecting opening.

[0017] In contrast, in the motor-operated valve according to the present invention, a flange portion is provided at the bottom end of the connecting member (fitting portion), and when the connecting member is screwed into the connecting opening, the base end of the flange portion (the boundary with the fitting portion) abuts against a step in the connecting opening. This makes it possible to release axial force and deformation from the fitting portion, where the male thread is formed and the seal member abuts, to the tip side of the flange portion (the side closer to the central axis of the connecting member), even when the connecting member is tightened with excessive torque, and makes it possible to avoid or suppress deformation of the connecting member (fitting portion) and damage to the threaded portion when assembling the motor-operated valve (when attaching the connecting member).

[0018] In a preferred embodiment of the present invention, the female thread is formed at a position farther from the bottom of the connection opening than the sealing member in the depth direction of the connection opening, and when the insertion portion is inserted into the connection opening, the male thread is positioned at a position farther from the bottom of the connection opening than the sealing member.

[0019] According to this embodiment, when the connecting member (insertion portion) is inserted into the connecting opening of the valve body and screwed in, the male thread will not pass through the location where the sealing member is located within the connecting opening (if the positional relationship between the male thread and the sealing member were reversed from that of the above embodiment, the male thread would pass through the location where the sealing member is located when the connecting member is attached), thereby eliminating the possibility of the sealing member being damaged by the male thread formed on the outer surface of the connecting member when the connecting member is attached.

[0020] In the present invention, the connecting member may be formed from a press part (a part formed by press working), which is advantageous in terms of cost.

[0021] According to the present invention, even if an excessive torque is applied to a connecting member during installation work, deformation of the member and damage to the threaded portion can be prevented or suppressed.

[0022] Other objects, features, and advantages of the present invention will become apparent from the following description of the preferred embodiments of the present invention, which is given with reference to the accompanying drawings. It will be apparent to those skilled in the art that the present invention is not limited to the following embodiments, and that various modifications can be made within the scope of the claims. In addition, the same reference numerals in the various drawings indicate the same or equivalent parts.

[0023] FIG. 1 is a longitudinal sectional view showing a motor-operated valve (closed state) according to a first embodiment of the present invention. FIG. 2 is a longitudinal sectional view showing an enlarged view of a main portion (a portion where a connecting member is arranged / portion B in FIG. 1 ) of the motor-operated valve according to the first embodiment. FIG. 3 is a longitudinal sectional view showing a motor-operated valve (open state) according to the first embodiment. FIG. 4 is a longitudinal sectional view showing a motor-operated valve (closed state) according to a second embodiment of the present invention. FIG. 5 is a longitudinal sectional view showing an enlarged view of a main portion (a portion where a connecting member is arranged / portion B1 in FIG. 4 ) of the motor-operated valve according to the second embodiment. FIG. 6 is a longitudinal sectional view showing an example of a conventional motor-operated valve. FIG. 7 is a longitudinal sectional view showing an enlarged view of a main portion (a portion where a connecting member is arranged / portion B2 in FIG. 1 ) of the conventional motor-operated valve.

[0024] A motor-operated valve according to an embodiment of the present invention will be described with reference to Figures 1 to 5. Note that in each figure, mutually orthogonal two-dimensional coordinates representing the up-down and left-right directions are appropriately displayed, and the following description will be based on these directions. However, the motor-operated valve of the present invention and each embodiment can be used in various orientations, and the directions are used for the sake of convenience of explanation, and the configuration of each part of the present invention is in no way limited by these directions. Furthermore, although the terms "vertical" and "horizontal" are used, the vertical direction coincides with the up-down direction, and the direction perpendicular to the vertical direction is the horizontal direction, including the left-right direction. Furthermore, in each figure, connecting members, which are characteristic parts of the present invention, are hatched.

[0025] 1 to 3, a motor-operated valve 11 according to a first embodiment of the present invention includes a valve body 12 having a valve chamber 13 therein and an inlet passage 15 for allowing a refrigerant to flow into the valve chamber 13 and an outlet passage 16 for allowing the refrigerant to flow out of the valve chamber 13; a valve seat 14 formed at the opening of the inlet passage 15 to the valve chamber 13; a valve element 17 that moves back and forth (up and down) relative to the valve seat 14 to change the amount of refrigerant passing through (flow rate); and a valve element guide that is provided to close the top surface of the valve chamber 13 and supports the valve element 17 so that it can move up and down. The valve body 12 includes a member 18, an electric motor 41 that drives the valve body 17, a reduction mechanism 56 that reduces the rotation of the electric motor 41, a transmission mechanism 33 that converts the reduced rotational motion into linear motion and transmits it to the valve body 17, a can (sealed container) 40 that has a cylindrical shape with an open bottom and a closed top (the bottom is open and the top is closed) and forms a sealed space above the top of the valve body 12, and accommodates the rotor 43 of the electric motor 41, the reduction mechanism 56, and the transmission mechanism 33 in this sealed space, and a connecting member 21 that connects the valve body 12 and the can 40.

[0026] The connecting member 21 is a cylindrical member with no bottom or lid, and has a cylindrical tubular portion 22 including an insertion portion 22a that is inserted into a connecting opening (described later) 19 of the valve body 12, a flange portion 23 formed so as to bend horizontally inward from the lower end of the tubular portion 22 (in other words, toward the central axis A of the connecting member 21), and a protruding portion 24 that bends from the upper edge of the tubular portion 22 and extends horizontally outward (in other words, in the direction away from the central axis A of the connecting member 21). The insertion portion 22a has a male thread 25 on its lower outer peripheral surface for connection to the valve body 12.

[0027] The connecting member 21 is a pressed part, which is advantageous in terms of manufacturing costs, and can be manufactured by forming a flange portion 23 and a protrusion portion 24, for example, by bending and squeezing after press molding, and then performing thread cutting to form a male screw 25.

[0028] Meanwhile, a connection opening 19 is provided on the motor installation surface of the valve body 12 (the upper surface of the valve body 12 on which the electric motor 41 is installed) to receive the fitting portion 22a of the connecting member 21. An internal thread 19a is formed on the lower inner peripheral surface of the connection opening 19 to threadably mate with the external thread 25 of the fitting portion 22a. A step 19b is formed on the bottom of the connection opening 19 against which the fitting portion 22a abuts. Furthermore, a ring-shaped seal member (O-ring) 28 is provided on the inner peripheral surface of the connection opening 19 above the internal thread 19a. This seal member 28 is interposed between the valve body 12 (the inner peripheral surface of the connection opening 19) and the outer peripheral surface of the connection member 21 (the fitting portion 22a) to prevent refrigerant from leaking from the valve chamber 13.

[0029] The connecting member 21 is attached to the valve body 12 by inserting the fitting portion 22a into the connection opening 19 of the valve body 12, threading the male threads 25 on the outer peripheral surface of the fitting portion 22a into the female threads 19a on the inner peripheral surface of the connection opening 19, and screwing the fitting portion 22a into the connection opening 19. During this attachment operation, the base end of the flange portion 23, which is the lower end of the fitting portion 22a, abuts against the step 19b at the bottom of the connection opening 19, thereby stopping the attachment and fixing the connecting member 21 to the valve body 12.

[0030] Therefore, according to this embodiment, even if the connecting member 21 is tightened with excessive torque when the connecting member 21 is installed, the axial force (axial force) and deformation can be released from the fitting portion 22a, which is provided with the male thread 25 and the sealing member 28, to the tip side of the flange portion 23 (the side closer to the central axis A of the connecting member 21), thereby avoiding or suppressing deformation of the fitting portion 22a or damage to the threaded portion (male thread 25) when assembling the electric valve 11 (when installing the connecting member 21).

[0031] When the connecting member 21 is attached to the valve body 12, the upper part of the cylindrical portion 22 protrudes upward from the connection opening 19, and a certain gap is formed between the upper surface of the valve body 12 and the protruding portion 24. A seal member 29 (described later) is provided in this gap to prevent moisture from entering the motor 41. A can 40 is joined by welding to the outer periphery of the upper surface of the connecting member 21 (the outer edge of the protruding portion 24).

[0032] The electric motor 41 is a stepping motor including a stator 42 disposed outside the can 40, a rotor 43 rotatably disposed inside the can 40, and a resin molded cover 57 that covers the can 40 and the stator 42. The resin molded cover 57 has cylindrical legs 57a at its lower end that surround the tubular portion 22 and the protruding portion 24 of the connecting member 21 at a fixed distance. A sealing member (O-ring) 29 is provided in the gap between the upper surface of the valve body 12 and the protruding portion 24 and between the inner circumferential surface of the legs 57a of the resin molded cover 57 and the outer circumferential surface of the connecting member 21 (tubular portion 22). This sealing member 29 prevents moisture from entering the electric motor 41.

[0033] The stator 42, which is disposed outside the can 40, includes a yoke 46 and a coil 48 wound around a bobbin 47. On the other hand, the rotor 43, which is disposed inside the can 40, is configured by integrally connecting a cylindrical rotor member 43a made of a magnetic material (permanent magnet) and a sun gear member 49 made of a resin material.

[0034] The rotor support shaft 44 is inserted into the center of the sun gear member 49 , and the upper part of the rotor support shaft 44 is supported by a support member 45 arranged inside the top of the can 40 .

[0035] The sun gear 49a of the sun gear member 49 meshes with a plurality of planetary gears 50 rotatably supported on a shaft 53 provided on a carrier 54 mounted on the bottom surface of the output gear 55. The upper parts of the planetary gears 50 mesh with an annular ring gear (internal tooth fixed gear) 51 attached to the upper part of a cylindrical gear case 39 fixed to the upper part of a screw bearing 31 (described later), and the lower parts of the planetary gears 50 mesh with an internal tooth gear 52 of an annular output gear 55. The number of teeth of the ring gear 51 and the number of teeth of the internal tooth gear 52 of the output gear 55 are slightly different, so that the rotation speed of the sun gear 49a is reduced at a large reduction ratio and transmitted to the output gear 55. These gear mechanisms (sun gear 49 a, planetary gear 50, ring gear 51 and output gear 55) constitute a reduction mechanism (paradox planetary gear reduction mechanism) 56 that reduces the rotation of the stepping motor 41 described above.

[0036] A cylindrical screw bearing 31 is inserted into the upper part of the connecting member 21 (cylindrical portion 22). Inside the screw bearing 31, a feed screw mechanism is provided as the transmission mechanism 33.

[0037] The output gear 55 is in slidable contact with the upper surface of the threaded bearing 31. The upper part of the stepped cylindrical output shaft 38 is press-fitted into the center of the bottom of the output gear 55, and the lower part of the output shaft 38 is rotatably inserted into a fitting hole 31a formed in the center of the upper surface of the threaded bearing 31. The lower end of the rotor support shaft 44 is fitted into the upper part of the output shaft 38 so as to be rotatable relative to the output shaft 38.

[0038] A female thread 31b is formed in the lower center portion of the screw bearing 31, and this female thread 31b is threadedly engaged with a male thread 32b formed on the outer peripheral surface of the screw drive member 32. The screw bearing 31 (female thread 31b) and the screw drive member 32 (male thread 32b) constitute a transmission mechanism (feed screw mechanism) 33 that converts the rotational motion supplied from the electric motor 41 via the reduction mechanism 56 into linear motion in the vertical direction and transmits it to the valve element 17.

[0039] Here, the output gear 55 rotates at a fixed position in the vertical direction without moving up and down, and a flat screwdriver-shaped plate portion 32a provided at the upper end of the screw drive member 32 is inserted into a slit-shaped fitting groove 38a provided at the lower end of the output shaft 38 connected to the output gear 55, thereby transmitting the rotational motion of the output gear 55 to the screw drive member 32. As the plate portion 32a provided on the screw drive member 32 slides up and down within the fitting groove 38a of the output shaft 38, when the output gear 55 (rotor 43) rotates, the screw drive member 32 moves linearly up and down by the feed screw mechanism 33, even though the output gear 55 does not move up and down.

[0040] The linear motion of this screw drive member 32 is transmitted to the valve element 17 via a ball joint 34 consisting of a ball 35a and a ball seat 35b, and a spring receiving member 36. The valve element 17 is composed of a valve element main body 17a that moves toward and away from the valve seat 14, and a stepped, cylindrical valve element support portion 17b that rises upward from the center of the upper surface of the valve element main body 17a. The spring receiving member 36 and the valve element 17 (valve element support portion 17b) are connected by inserting the upper end of the valve element support portion 17b into a fitting hole (lower surface fitting hole) formed in the center of the lower surface of the spring receiving member 36. In addition, a fitting hole (upper surface fitting hole) is also formed in the center of the upper surface of the spring receiving member 36, and the ball seat 35b is fitted into this upper surface fitting hole.

[0041] A communication hole 27 is formed between the valve chamber 13 and the connection opening 19, and the connection opening 19 and the valve chamber 13 communicate with each other via this communication hole 27. A valve element guide member 18 is fixed within this communication hole 19, thereby closing the upper surface of the valve chamber 13. The valve element guide member 18, which is fixed to the upper part of the valve chamber 13, has a stepped through hole in its center, through which the valve element support portion 17b passes so as to be slidable up and down, and in which a compression coil spring 37 is installed. The compression coil spring 37 is provided between the step at the top of the through hole and a spring receiving member 36. The compression coil spring 37 biases the valve element 17 upward, which is the valve opening direction. During the valve opening operation, the biasing force of the coil spring 37 is applied to the valve element 17 in addition to the driving force of the electric motor 41, thereby enabling a more reliable valve opening operation.

[0042] In this embodiment, the central axes of the valve body 17, valve seat 14, valve body guide member 18, connecting member 21, screw bearing 31, screw drive member 32, output shaft 38 and rotor support shaft 44, as well as the rotation axis of the rotor 43, coincide with the axis A of the electric valve 11, which extends vertically in the up-down direction.

[0043] The operation of the motor-operated valve 11 according to this embodiment will be described as follows.

[0044] When current is supplied to the stator 42 (coil 48) so that the rotor 43 rotates in one direction from the closed valve state shown in Figure 1, the rotation of the rotor 43 is converted into linear motion by the feed screw mechanism 33, and the screw drive member 32 is pulled upward. Accordingly, the spring seat 36, which is pressed against the underside of the screw drive member 32 via the ball joint 34 by the biasing force of the compression coil spring 37, and the valve body support portion 17b, which is connected to the spring seat 36, are pulled upward, causing the valve body portion 17a to separate from the valve seat 14, and refrigerant flowing in from the inlet passage 15 passes through the valve chamber 13 and flows out from the outlet passage 16 (see arrow C in Figure 2). The amount of refrigerant passing through (refrigerant flow rate) in this open valve state can be adjusted by the amount of rotation of the rotor 43.

[0045] On the other hand, when current is supplied to the stator 42 (coil 48) so that the rotor 43 rotates in the opposite direction from the open state, the rotation of the rotor 43 is converted into linear motion by the feed screw mechanism 33, and the screw drive member 32 moves downward. With this downward movement, the ball joint 34, spring bearing member 36, and valve body 17 move downward, and when the valve body main body 17a abuts against the valve seat 14, the flow path between the inlet channel 15 and the outlet channel 16 is blocked, resulting in a closed valve state (see FIG. 1).

[0046] In addition, the electric valve 11 of this embodiment (as well as the second embodiment described below) can also be used to reverse the flow of refrigerant from the above, i.e., to have the refrigerant flow in through the outlet hole 16 and out through the inlet hole 15.

[0047] Second Embodiment A motor-operated valve according to a second embodiment of the present invention will be described with reference to Figures 4 and 5. Note that the same components as those in the motor-operated valve of the first embodiment will be assigned the same reference numerals, and redundant description will be omitted, with differences being mainly described.

[0048] As shown in Figures 4 and 5, the motor-operated valve 61 according to the second embodiment of the present invention comprises a connecting member 62 having a cylindrical portion 22 including a fitting portion 22a, a flange portion 23, and a protruding portion 24, as in the first embodiment, and also comprises a sealing member 28 within the connecting opening 19 of the valve body 12, but the arrangement of the male thread 25 (and female thread 19a) and the sealing member 28 is reversed in the vertical direction from that in the first embodiment.

[0049] That is, in the first embodiment, the sealing member 28 is positioned above the male thread 25 (and the female thread 19a), but in this embodiment, the sealing member 28 is positioned below the male thread 25 (and the female thread 19a) (near the bottom of the connection opening 19).

[0050] With this arrangement, when the fitting portion 22a is inserted into the connection opening 19 to attach the connecting member 62 to the valve body 12, the male thread 25 formed on the outer peripheral surface of the fitting portion 22a does not pass through the seal member 28 (the seal member 28 must be installed in the connection opening 19 before the connecting member 62). Therefore, it is possible to prevent the seal member 28 from being damaged by the male thread 25 formed on the outer peripheral surface of the connecting member 62 when the connecting member 62 is attached, which would result in valve leakage.

[0051] A Axis (central axis) C Refrigerant flow 11, 61 Motor-operated valve 12 Valve body 13 Valve chamber 14 Valve seat 15 Inflow path 16 Outflow path 17 Valve body 17a Valve body body portion 17b Valve body support portion 18 Valve body guide member 19 Connection opening 19a Female thread 19b Step portion 21, 62, 63 Connection member 22 Cylindrical portion 22a Fitting portion 23 Flange portion 24 Protruding portion 25 Male thread 27 Communication hole 28, 29 Seal member 31 Screw bearing 31a Insertion hole 31b Female thread portion 32 Screw drive member 32a Plate-shaped portion 32b Male thread portion 33 Transmission mechanism (feed screw mechanism) 34 Ball joint 35a Ball 35b Ball seat 36 Spring receiving member 37 Compression coil spring 38 Output shaft 38a Fitting groove 39 Gear case 40 Can (sealed container) 41 Electric motor (stepping motor) 42 Stator 43 Rotor 43a Rotor member 44 Rotor support shaft 45 Support member 46 Yoke 47 Bobbin 48 Coil 49 Sun gear member 49a Sun gear 50 Planetary gear 51 Ring gear (internal tooth fixed gear) 52 Internal tooth gear 53 Shaft 54 ​​Carrier 55 Output gear 56 Reduction mechanism (paradox planetary gear reduction mechanism) 57 Resin molded cover 57a Cylindrical leg portion

Claims

1. An electric valve comprising: a valve body having an internal valve chamber communicating with an inlet passage and an outlet passage; a valve disc that moves toward and away from a valve seat formed in the valve chamber; a can that rotatably houses a rotor included in an electric motor that drives the valve disc; and a connecting member that connects the can and the valve body, wherein the valve body has a connection opening on its top surface into which the connecting member can be fitted, and the connection opening has a step on its bottom surface against which the connecting member can abut when the connecting member is fitted into the connection opening, and the connecting member has a tubular fitting portion that is fitted into the connection opening, and a flange portion that is formed so as to bend from the bottom end of the fitting portion toward the center of the connecting member, and the fitting portion has a male thread on its outer peripheral surface that screws into a female thread formed on the inner peripheral surface of the connection opening, and when the fitting portion is fitted into the connection opening, a base end of the flange portion abuts against the step.

2. The motor-operated valve according to claim 1, wherein a ring-shaped seal member is provided in the connection opening so as to be interposed between the fitting portion and the valve body.

3. The motor-operated valve according to claim 2, wherein the female thread is formed at a position farther from the bottom of the connection opening than the seal member in the depth direction of the connection opening, and the male thread is positioned at a position farther from the bottom of the connection opening than the seal member when the insertion portion is inserted into the connection opening.

4. The motor-operated valve according to any one of claims 1 to 3, wherein the connecting member is a pressed part formed by press working.

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