JP2008076031A - Expansion valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To adjust energizing force of a spring member by deforming a deformation part in an expansion/contraction direction of the spring member to adjust the characteristic of a valve opening to a desired characteristic. <P>SOLUTION: This expansion valve has: a throttle passage 610 connecting a high-pressure passage 310 and a low-pressure passage 320 to decompress and expand a high-pressure refrigerant; a spool valve 600 that is an expansion valve opening and closing the throttle passage 610, adjusting a refrigerant flow rate by the valve opening; the spring member 700 imparting the energizing force to a valve closing direction, to the spool valve 600; an operation rod 450 adjusting the energizing force to the valve closing direction to the spool valve 600 to adjust the valve opening; and the deformation part 120 pinching the spring member 700 together with the spool valve 600 along the valve closing direction, plastically deformable in a direction along the valve closing direction according to deformation force from the outside. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an expansion valve for a refrigeration cycle having an adjustment mechanism for adjusting a control characteristic of a refrigerant flow rate.

  As an expansion valve for a refrigeration cycle, a valve that controls the flow of refrigerant by sensing either or both of temperature and pressure and adjusting the valve opening is known. For example, what is called a temperature-type expansion valve is known as one that senses the temperature and pressure of a low-pressure refrigerant and controls the refrigerant state to a predetermined state. An expansion valve that detects the state of the high-pressure refrigerant and controls it to a predetermined state is also called a pressure control valve. As such an expansion valve, for example, the one described in Patent Document 1 is known.

  The temperature type expansion valve of Patent Document 1 is a so-called ball valve type, and a crank-shaped refrigerant passage is formed by connecting a high-pressure passage and a low-pressure passage that are offset in the vertical direction through a throttle passage. Yes. An operating rod having a smaller diameter than that of the throttle passage is inserted into the throttle passage extending in the vertical direction, and a ball valve for opening and closing the throttle passage is integrated with the tip of the operating rod. Therefore, the ball valve opens and closes the throttle passage inlet by displacing the operating rod in the vertical direction. The throttle passage communicates with the opening at the upper end of the main body block through another space, and the operating rod and the ball valve are assembled by being inserted into the throttle passage from the opening at the upper end of the main body block. Specifically, with the valve seat member press-fitted into the throttle passage being passed through the operating rod, a ball valve is integrated with the tip of the operating rod by welding or the like, and these are inserted into the throttle passage from the opening at the upper end of the main body block. . When the operating rod is inserted, the valve seat member is press-fitted into the throttle passage by the large diameter portion formed on the operating rod.

Thus, according to the method of assembling each member from the opening at the upper end of the main body block, the reduction in the number of parts and the ease of assembling can be ensured, so that the assembling accuracy can be easily increased. For this reason, the adjustment mechanism for correcting the characteristics of the valve opening caused by the error in assembly accuracy is omitted.
JP 2002-310538 A

  However, it is conceivable that the length of the operating rod changes during the welding process of the ball valve or that the operating rod deforms when the valve seat member is press-fitted. In such a case, it is predicted that the characteristics of the valve opening will deviate from the predetermined characteristic range. Therefore, it is desirable to provide an adjustment mechanism even if the assembly accuracy is easily improved.

  On the other hand, adjusting the valve opening characteristic using the adjusting mechanism is limited to the stage before product shipment. Accordingly, providing a complicated adjustment mechanism causes unnecessary cost increase and an increase in the number of parts, and thus a configuration capable of adjusting the valve opening characteristic as easily as possible has been desired.

  This invention is made | formed in view of the said situation, The objective is to provide the expansion valve which can adjust the characteristic of valve opening with a simple structure.

  In order to achieve the above object, according to the first aspect of the present invention, the high-pressure refrigerant flowing in from the high-pressure passage is decompressed and expanded, and the low-pressure refrigerant after decompression and expansion flows out into the low-pressure passage and flows out into the low-pressure passage. An expansion valve for a refrigeration cycle that adjusts a flow rate, which communicates between a high-pressure passage and a low-pressure passage, opens and closes a throttle passage that decompresses and expands high-pressure refrigerant, and opens and closes the throttle passage. A valve body that adjusts the flow rate of the refrigerant, a spring member that applies a biasing force to the valve body, a spring member that is sandwiched with the valve body, and a deformation that can be plastically deformed in the expansion and contraction direction of the spring member in accordance with an external deformation force It is characterized by having a part.

  According to the first aspect of the present invention, by applying a deforming force from the outside and deforming the deforming portion in the extending direction of the spring member, the space between the valve body and the biasing force of the spring member can be increased. . Further, by deforming the deforming portion in the direction of reduction of the spring member, it is possible to widen the gap with the valve body and reduce the biasing force of the spring member. Thus, by deforming the deforming portion in the expansion and contraction direction of the spring member, the biasing force of the spring member can be adjusted to adjust the valve opening characteristic to a desired characteristic.

  Further, since the urging force of the spring member is adjusted by deformation of the deforming portion, a mechanism necessary for adjusting the urging force can be simplified. Moreover, even with such a simple configuration, the biasing force can be reliably adjusted.

  The invention according to claim 2 has a main body block that accommodates the spring member, and the deformable portion is formed as a thin wall that is formed integrally with the main body block and is thin in the expansion and contraction direction.

  According to the second aspect of the present invention, since a part of the wall surface of the main body block only needs to be formed thin, it is possible to form a deformed portion that is a thin wall at the same time when the main body block is formed, and to simplify the configuration. . Further, when such a deforming portion is deformed, the deforming portion can be plastically deformed in the expansion / contraction direction by applying a deformation force in the expansion / contraction direction.

  In the invention of claim 3, it has a main body block which accommodates a spring member, a hole is formed in a position facing the valve element in the main body block, and the deformed portion has substantially the same shape as the hole. It is comprised by the deformation | transformation board, and is accommodated in the hole so that it may become a fixed state with respect to a main body block.

  According to a third aspect of the present invention, the deformable portion may be provided separately from the main body block. In this case, although a deformation plate is required in addition to the main body block, parts to be added can be minimized.

  According to a fourth aspect of the present invention, the hole is set to have a larger diameter than the diameter dimension in the direction orthogonal to the expansion / contraction direction of the spring member.

  Further, in the configuration of claim 3, since the diameter of the deformation plate can be easily increased as described in claim 4, it is desired to increase the amount of deformation, that is, to make a wide adjustment range. In some cases, this is a preferred configuration.

  The invention according to claim 5 is characterized in that, among the deforming portions, the acting surface on which the deforming force from the outside acts is set to be the same as or relatively larger than the receiving surface with which the spring member abuts. Yes.

  According to the invention of claim 5, since the deformation of the deforming portion acts on the entire receiving surface, the entire receiving surface can be deformed in the direction along the expansion / contraction direction. For this reason, it is possible to prevent uneven deformation such that a part of the receiving surface is deformed.

  The invention according to claim 6 is characterized in that the deformed portion has a thickness set to 0.5 to 2 mm and a diameter dimension of the receiving surface set to 7 to 20 mm.

  According to the sixth aspect of the present invention, the amount of deformation commensurate with the deformation force from the outside can be obtained, so that the characteristics of the valve opening can be easily adjusted.

  In the invention of claim 7, a cylindrical projection is formed on the working surface, and a screw portion is formed on the cylindrical projection to which an adjusting jig for applying a deformation force to the working surface is screwed. It is characterized by that.

  According to the invention of claim 7, the receiving surface is deformed in the extending direction or the reducing direction by moving the adjusting jig in the extending direction or the reducing direction in a state where the adjusting jig is screwed to the cylindrical projection. Can be made. Therefore, the urging force of the urging means can be adjusted in both directions of increasing and decreasing.

  The invention according to claim 8 is characterized in that a peripheral wall is formed coaxially with the action surface around the action surface.

  According to the invention of claim 8, since the positioning with the deforming portion is performed by inserting the adjusting jig into the peripheral wall, the deforming portion is surely deformed without deforming the position shifted from the deforming portion. be able to.

  The invention of claim 9 is characterized in that a screw portion into which the adjustment jig is screwed is formed on the peripheral wall.

  According to the ninth aspect of the present invention, the deforming portion can be deformed in the reduction direction by screwing the adjusting jig into the peripheral wall and screwing the adjusting jig. If it does in this way, a deformation | transformation part can be deformed by a very small force compared with the case where a deformation | transformation part is deformed by moving an adjustment jig to the reduction direction side.

<First Embodiment>
An embodiment of an expansion valve according to the present invention will be described with reference to FIGS. In the present embodiment, the present invention is applied to a temperature type expansion valve. The temperature type expansion valve 1 (hereinafter referred to as the expansion valve 1) is disposed in a general refrigeration cycle, and decompresses and expands the high-pressure liquid-phase refrigerant that has flowed out of the capacitor 2 and supplies the low-pressure refrigerant after decompression and expansion. It is caused to flow out to the evaporator 3. Further, the flow rate of the refrigerant flowing out to the evaporator 3 is adjusted by adjusting the valve opening degree according to the degree of superheat of the refrigerant at the outlet of the evaporator 3.

  The refrigerant flow in the refrigeration cycle is as follows. That is, the high-pressure gas-phase refrigerant compressed by the compressor 4 is heat-exchanged by the condenser 2 to become a high-pressure liquid-phase refrigerant, and the high-pressure liquid-phase refrigerant is decompressed and expanded by the expansion valve 1 to be a gas-liquid two-phase refrigerant. It becomes a low-pressure refrigerant. This low-pressure refrigerant is heat-exchanged by the evaporator 3 to become a low-pressure gas-phase refrigerant and is sucked into the compressor 4.

  Two passages penetrating in the horizontal direction are formed in the main body block 100 of the expansion valve 1 in the vertical direction. The upper passage is a superheat degree detection passage 200 for allowing the refrigerant flowing out of the evaporator 3 to flow into the compressor 4 and detecting the superheat degree of the refrigerant passing therethrough. The lower passage is a decompression passage 300 for decompressing and expanding the high-pressure liquid-phase refrigerant that has flowed out of the capacitor 2 into a low-pressure refrigerant and let it flow to the evaporator 3.

  An opening 110 communicating with the superheat degree detection passage 200 is formed at the upper end of the main body block 100. The opening 110 houses a power element 400 for adjusting the valve opening degree of the spool valve 600 which is a valve body in accordance with the degree of superheat of the refrigerant passing through the degree of superheat detection passage 200.

  A case 420 that forms the power element 400 houses a diaphragm 420 that divides the internal space into two. An upper pressure chamber 430 is formed on the upper side of the two divided spaces, and a lower pressure chamber 440 is formed on the lower side.

  The upper pressure chamber 430 is filled with a saturated refrigerant and is sealed by a plug 431. The encapsulated refrigerant senses the temperature of the refrigerant passing through the superheat degree detection passage 200, and a saturation pressure corresponding to the temperature acts on the diaphragm 420. Further, a stopper member 441 is housed in the lower pressure chamber 440 with its outer peripheral portion sandwiched between the case 410 and the diaphragm 420.

  A male screw 411 that is screwed into a female screw 111 formed in the opening 110 at the upper end of the main body block 100 is formed at the lower portion of the case 410. In addition, an opening 412 is formed on the lower end surface of the case 410 so that the refrigerant passing through the superheat degree detection passage 200 can reach the stopper member 441, and the pressure of the refrigerant passing through the superheat degree detection passage 200 is set to the stopper member 441. It comes to act on.

  Therefore, the saturation pressure of the refrigerant in the upper pressure chamber 430 and the refrigerant pressure to the stopper member 441 act on the diaphragm 420, and the diaphragm 420 is displaced up and down by the pressure difference between them, so that the stopper member 441 The displacement position is determined. Thereby, when the pressure difference increases, the stopper member 441 is displaced downward, while when the pressure difference decreases, the stopper member 441 is displaced upward. As a result, when the degree of superheat increases, the stopper member 441 is displaced downward, and when the degree of superheat decreases, the stopper member 441 is displaced upward.

  An operating rod 450 is attached to the stopper member 441 to transmit the displacement of the stopper member 441 to the spool valve 600 disposed in the pressure reducing passage 300 across the superheat degree detection passage 200. The operating rod 450 is displaced in accordance with the stopper member 441, so that a biasing force in the downward direction (opening direction) is applied to the spool valve 600.

  The decompression passage 300 is configured by connecting a high-pressure passage 310 and a low-pressure passage 320 offset in the vertical direction with a small-diameter passage 330 extending in the vertical direction. The high pressure passage 310 on the lower side is a passage through which the high pressure liquid phase refrigerant from the condenser 2 flows into the small diameter passage 330. The low-pressure passage 320 on the upper side is a passage through which the low-pressure refrigerant decompressed and expanded in the small-diameter passage 330 flows out to the evaporator 3.

  A spool valve 600 is inserted into the small-diameter passage 330 and a spring member 700 that applies an upward biasing force to the spool valve 600 is disposed. In this embodiment, the upward direction is the valve closing direction for closing the valve body. This valve closing direction is also the expansion and contraction direction of the spring member 700. In this embodiment, the spring member 700 is accommodated in a compressed state given a preload. The valve closing direction is an extension direction for the spring member 700. The valve opening direction is a reduction direction for the spring member 700. The diameters of the spool valve 600 and the spring member 700 are substantially the same as the diameter of the small diameter passage 330.

The spool valve 600 is formed with a T-shaped throttle passage 610 that connects the high-pressure passage 310 and the low-pressure passage 320. The throttle passage 610 functions as a passage for decompressing and expanding the high-pressure refrigerant from the high-pressure passage 310 and allowing the low-pressure refrigerant after decompression and expansion to flow out to the low-pressure passage 320.
The spool valve 600 has an outer circumferential groove 620 formed at the same height as the refrigerant outlet 611 leading to the high-pressure passage 310.

  The spool valve 600 is displaced up and down in the small-diameter passage 330, thereby changing the coincidence area between the outer peripheral groove 620 and the low-pressure passage 320, thereby adjusting the refrigerant flow rate of the low-pressure refrigerant flowing out to the low-pressure passage 320. It has become.

  That is, when the spool valve 610 is displaced in the valve opening direction, which is the downward direction, the valve opening, which is the coincidence area between the outer circumferential groove 620 and the low pressure passage 320, increases and the refrigerant flow rate of the low pressure refrigerant flowing out to the low pressure passage 320 is increased. Increase. Further, when the spool valve 600 is displaced in the valve closing direction that is the upward direction, the valve opening that is the coincidence area between the outer circumferential groove 620 and the low pressure passage 320 decreases, and the refrigerant flow rate of the low pressure refrigerant flowing out to the low pressure passage 320 is increased. Decrease. That is, the refrigerant flow rate of the low-pressure refrigerant flowing out to the low-pressure passage 320 can be adjusted by displacing the spool valve 600 in the valve opening direction or the valve closing direction and adjusting the valve opening degree.

  A spring member 700 is provided below the spool valve 600 in the small-diameter passage 330 to apply an upward biasing force (valve closing direction) to the spool valve 600. The spring member 700 is constituted by a coil spring. A spring seat 710 is disposed at the lower end of the spring member 700. The spring seat 710 stabilizes the spring seat and prevents the main body block 100 from being cut by the rotation of the spring member 700.

  In the main body block 100, a deformable portion 120 that is plastically deformable upward (valve closing direction) by a deforming force from the outside is formed at a lower position of the small diameter passage 330. The deforming portion 120 is configured as a thin wall that is thinner than other portions of the main body block 100 in the vertical direction (valve closing direction and valve opening direction) of the main body block 100. The deformable portion 120 provides a seat that receives a load applied to the spring member 700. The deformable portion 120 is set to have a thickness and a width so that the deformable portion 120 can be displaced in the expansion / contraction direction (vertical direction) of the spring member 700. The deformable portion 120 can be displaced so as to change the initial load of the spring member 700. The deformation part 120 can be displaced over a range in which the characteristics of the expansion valve 1 can be adjusted in the manufacturing process. The deformation portion 120 is provided at a position where the adjustment jig 800 that is a deformation tool can easily reach in a state where the main body block 100 is firmly held. The deformation part 120 is formed to be significantly thinner than the thickness of the surrounding main body block 100. The deformable portion 120 is located in a recess provided in the middle of one surface (bottom surface) of the polyhedral main body block 100. The recess is surrounded by the peripheral wall 130.

  The upper surface of the deformable portion 120 is a receiving surface 120 </ b> A that sandwiches the spring member 700 together with the spool valve 600 and applies the urging force of the spring member 700 to the spool valve 600. Further, the lower surface of the deformable portion 120 is an action surface 120B that receives a deformation force by an adjusting jig 800 such as a plunger. Further, both the receiving surface 120A and the working surface 120B are formed in a circular shape.

  The peripheral wall 130 is formed coaxially with the deformable portion 120, and the diameter thereof is set larger than the diameter of the receiving surface 120 </ b> A of the deformable portion 120. Thereby, the working surface 120B is relatively larger than the receiving surface 120A.

  The assembly procedure of the expansion valve 1 of the present embodiment is as follows. First. The spring seat 710, the spring member 700, and the spool valve 600 are sequentially accommodated from the opening 100 into the small diameter passage 330. Then, the assembly is completed by screwing the power element 400 from the opening 110 of the housing 100. After assembling a plurality of parts, the deforming portion 120 is deformed to adjust the control characteristics of the spool valve 600. In this embodiment, after all the parts related to the movable part of the expansion valve 1 are assembled, the adjustment process is performed.

  Here, the valve opening degree of the spool valve 600 is adjusted as follows. Specifically, when the degree of superheat of the refrigerant that has flowed out of the evaporator 3 increases, the pressure difference in the power element 400 increases, and the operating rod 450 tends to be displaced downward together with the stopper member 441. When the operation rod 450 is displaced downward, a biasing force downward (in the valve opening direction) with respect to the spool valve 600 is applied to the spool valve 600. The spool valve 600 is displaced downward in the small diameter passage 330 against the urging force of the spring member 700 upward (in the valve closing direction). Thereby, the valve opening degree which is a coincidence area of the small diameter passage 330 and the outer peripheral groove 620 increases, and the refrigerant flow rate of the low-pressure refrigerant flowing out to the low-pressure passage 320 increases.

  On the other hand, when the degree of superheat of the refrigerant that has flowed out of the evaporator 3 decreases, the pressure difference in the power element 400 decreases, and the operating rod 450 tends to be displaced upward together with the stopper member 441. When the actuating rod 450 tends to be displaced downward, the downward urging force (opening direction) with respect to the spool valve 600 decreases. The spool valve 600 is displaced upward in the small diameter passage 330 by an urging force upward (in the valve closing direction) of the spring member 700. As a result, the valve opening, which is the coincidence area between the small-diameter passage 330 and the outer peripheral groove 620, decreases, and the refrigerant flow rate of the low-pressure refrigerant flowing out to the low-pressure passage 320 decreases.

  In the present embodiment, the repulsive force of the spring member 700 is adjusted so that the above-described valve opening characteristic is in a predetermined range. Adjustment of the repulsive force of the spring member 700 is performed by plastically deforming the deformable portion 120 in the upward direction (extension direction) using the adjustment jig 800. First, the adjustment jig 800 is made to coincide with the working surface 120 </ b> B of the deformable portion 120. At this time, by positioning the adjustment jig 800 into the peripheral wall 130, the adjustment jig 800 is positioned with respect to the deformed portion 120.

  When the adjustment jig 800 is moved upward (extension direction) from the state in which the adjustment jig 800 is in contact with the working surface 120B of the deformation part 120, the deformation in the upward direction (extension direction) with respect to the deformation part 120 is performed. The force acts to deform the deformable portion 120, and the receiving surface 120A moves upward. Here, since the acting surface 120B is set to be relatively larger than the receiving surface 120A, the deformation of the deforming portion 120 acts on the entire receiving surface 120A, and the entire receiving surface 120A is directed upward (elongated). Direction).

  As a result, the interval between the receiving surface 120A and the spool valve 600 is reduced, and the biasing force of the spring member 700 in the valve closing direction with respect to the spool valve 600 is adjusted to the increase side. Thereby, the valve opening characteristic of the spool valve 600 is changed.

  The characteristic of the spring member 700 to be set is obtained in advance, and the amount of movement necessary to obtain this characteristic is also determined in advance. Therefore, in the adjustment, the adjustment jig 800 may be moved according to the determined movement amount.

  In this embodiment, the thickness t1 of the deformable portion 120 is set to 1 mm and the diameter φ is set to 14 mm. At this time, the amount of movement of the adjustment jig 800 and the change in the set value (initial repulsive force) of the spring member 700 are changed. The relationship with the quantity is shown in the graph of FIG. According to this graph, it can be seen that the amount of change in the set value of the spring member 700 is substantially proportional to the amount of movement when the amount of movement of the adjustment jig 800 is up to 0.8 mm. Therefore, in this embodiment, when it is desired to change the set value change amount of the spring member 700 within a range up to 40 (kPa), the adjustment jig 800 can perform the adjustment with the corresponding movement amount. .

  Further, the thickness t1 and the diameter φ of the deformable portion 120 are not limited to the above numerical values, and the thickness t1 can be variously changed within the range of 0.5 to 2 mm and the diameter φ of 7 to 20 mm. Within this range, the relationship between the amount of movement of the adjustment jig 800 and the amount of change in the set value of the spring member 700 is substantially the same as in the above graph.

  By the way, when the thickness t1 is a dimension that exceeds the above range to the thickness side, that is, when the thickness t1 is thick with respect to the diameter φ, even if the amount of movement is increased, the deformation Since the part 120 hardly deforms, the set value of the spring member 700 may not be adjusted to a desired value.

  When the thickness t1 exceeds the above range to the thin side, that is, when the thickness t1 is thin with respect to the diameter φ, the rigidity of the deformable portion 120 decreases, and the adjustment jig Even if the deforming portion 120 is deformed by 800, it is conceivable that the deforming portion 120 is pushed back downward (reduction direction) due to the repulsive force of the spring member 700, the refrigerant pressure in the small diameter passage 330, or the like. Therefore, even if the deforming unit 120 is deformed by a predetermined movement amount, the desired set value may not be set.

  Therefore, if the thickness t1 and the diameter φ are set within the above ranges, the deforming portion 120 can be reliably set to a set value corresponding to the movement amount.

  According to the present embodiment, by applying a deformation force to the deformation portion 120 by the adjusting jig 800 and deforming the deformation portion 120 in the upward direction (extension direction), the space between the spool valve 600 and the spring member is reduced. The biasing force in the valve closing direction of 700 can be increased. Thus, by deforming the deforming portion 120 in the upward direction (extension direction), the biasing force of the spring member 700 can be adjusted to adjust the valve opening characteristic to a desired characteristic. Further, since the set value of the spring member 700 is adjusted by the deformation of the deforming portion 120, a mechanism necessary for adjusting the set value can be simplified. Even with such a simple configuration, the set value can be adjusted reliably.

  Furthermore, since the thin wall in which a part of the main body block 100 is formed as a thin part is configured as the deforming part 120, it is not necessary to separately provide the deforming part 120, and the configuration can be further simplified.

  In addition, since the action surface 120B of the deformable portion 120 is set to be relatively larger than the receiving surface 120A, the deformation of the deformable portion 120 acts on the entire receiving surface 120A, and the entire receiving surface 120A. Can be deformed upward (extension direction). As a result, it is possible to prevent deformation such as a part of the receiving surface 120A being deformed.

  Further, since the peripheral block 130 is formed coaxially with the deforming portion 120 in the main body block 100, the adjustment jig 800 can be easily positioned with respect to the deforming portion 120. For this reason, the deformation | transformation part 120 can be deform | transformed reliably, without changing the position which shifted | deviated from the deformation | transformation part 120. FIG.

<Second Embodiment>
A second embodiment according to the present invention will be described with reference to FIG. In the present embodiment, a cylindrical protrusion 140 is formed on the working surface 120B, and a female screw 140A (screw part) into which the adjustment jig 800 is screwed is formed on the cylindrical protrusion 140. ing. The cylindrical protrusion 140 is formed integrally with the main body block 100 and is formed at the same time as the main body block 100 is formed.

  The cylindrical protrusion 140 provides an operation unit for displacing the deformable portion 120 in at least one of the upper and lower directions (stretching direction). The cylindrical protrusion 140 is provided at the center of the deformable portion 120. The cylindrical protrusion 140 extends along the displacement direction of the deformable portion 120. The deformation part 120 is displaced in both or one of the extension direction and the contraction direction of the spring member 700.

  On the other hand, the adjustment jig 800 is formed with a male screw 800A that is screwed into the female screw 140A of the cylindrical protrusion 140, and the adjustment jig 800 is screwed into the cylindrical protrusion 140. The tool 800 is moved in the vertical direction (stretching direction).

  When the adjustment jig 800 is moved in the upward direction, the receiving surface 120A is moved in the upward direction (extension direction) by the deformation portion 120 being deformed in the upward direction. On the other hand, when the adjustment jig 800 is moved downward (reduction direction), the deforming portion 120 is deformed downward (reduction direction), so that the receiving surface 120A is moved downward (reduction direction). Therefore, in the present embodiment, the receiving surface 120A can be deformed in the vertical direction (stretching direction), so that the urging force of the spring member 700 can be adjusted in both the increasing direction and the decreasing direction.

<Third Embodiment>
A third embodiment according to the present invention will be described with reference to FIG. In the present embodiment, a female screw 130 </ b> A (screw portion) into which the male screw 800 </ b> A formed on the adjustment jig 800 is screwed is formed on the peripheral wall 130. In addition, the depth of the recessed part enclosed by the surrounding wall 130 of this embodiment is deeper than the structure of 1st Embodiment. Further, the depth of the recess surrounded by the peripheral wall 130 is larger than the diameter of the deformable portion 120.

  Then, the adjustment jig 800 is screwed onto the peripheral wall 130, and the spring member 700 is deformed upward (extension direction) by the screwing of the adjustment jig 800. In this way, the deforming portion 120 can be deformed with a very small force compared to the case where the deforming portion 120 is deformed by moving the adjustment jig 800 upward. Therefore, the deforming portion 120 can be deformed by a small device without using a large-scale device such as a press device.

<Fourth Embodiment>
A fourth embodiment according to the present invention will be described with reference to FIG. In the present embodiment, a hole 150 that extends downward from the small diameter passage 330 and communicates with the lower end of the main body block 100 is formed. The hole 150 is coaxial with the small diameter passage 330 and has a larger diameter than the diameter of the small diameter passage 330. That is, the hole 150 is formed at a position facing the spool valve 600 so as to have a larger diameter than the diameter of the spring member 700.

  A deformation plate 160 having substantially the same shape as the hole 150 is fixed inside the hole 150 in a press-fitted state. The deformation plate 160 is formed in a cup shape. The deformation plate 160 is attached to the main body block 100 with its open end directed toward the spring member 700. The deformation plate 160 is located in the hole 150 that provides the recess. In the present embodiment, the deformation plate 160 functions as the deformation portion 120.

  Therefore, by deforming the deformable plate 160 with the adjusting jig 800, the set value of the spring member 700 can be adjusted, thereby adjusting the valve opening characteristic. In such a configuration, since the diameter of the deformation plate 160 can be easily increased, this is a preferable configuration when it is desired to increase the amount of deformation, that is, when a wide adjustment range is desired.

<Fifth Embodiment>
A fifth embodiment according to the present invention will be described with reference to FIG. The present embodiment relates to an expansion valve 1 using a ball valve as a valve body. As shown in FIG. 7, a first valve seat member 910 for receiving and supporting the ball valve 900 is placed on the upper side of the spring member 700 in the small diameter passage 330. A second valve seat member 920 is disposed on the upper side of the first valve seat member 910 while being press-fitted into the small diameter passage 330 from above. The second valve seat member 920 has a through-hole 921 into which the operating rod 450 is inserted and extends in the vertical direction. The second valve seat member 920 contacts the ball valve 900 disposed between the valve seat members 910 and 920. It touches. The second valve seat member 920 has a hole 922 that is orthogonal to the through hole 921, and the hole 922 communicates with the low-pressure passage 320.

  In the through hole 921, a lower region communicating the high pressure passage 310 and the hole 922 is a throttle passage 921A for decompressing and expanding the high pressure refrigerant, and the ball valve 900 opens and closes the inlet of the throttle passage 921A. Thus, the refrigerant flow rate of the low-pressure refrigerant flowing out to the low-pressure passage 320 is adjusted.

  In the main body block 100, the deformed portion 120 and the peripheral wall 130 are formed in the lower position of the small diameter passage 330 in the same manner as in the first embodiment, and the valve opening degree is adjusted in the same manner as in the first embodiment. It can be performed.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.

  In the first embodiment, the configuration in which the peripheral wall 130 is provided coaxially with the deformable portion 120 is shown, but the configuration in which the peripheral wall 130 is omitted may be used. That is, the working surface 120B of the deformable portion 120 may be flush with the bottom surface of the main body block 100.

  In the first embodiment, the working surface 120B is configured to be relatively larger than the receiving surface 120A. However, the working surface 120B has the same size as the receiving surface 120A or the receiving surface 120A. You may comprise smaller than this.

  In the first embodiment, the deforming portion 120 is deformed by stroking the adjusting jig 800 using a pressing device. For example, the deforming portion 120 is hit by striking the deforming portion 120 with a hammer or the like. 120 may be deformed.

  Further, in the second embodiment, the inner diameter of the cylindrical protrusion 140 is configured to be smaller than the diameter of the small diameter passage 330. However, the inner diameter of the cylindrical protrusion 140 is the same as the diameter of the small diameter passage 330. You may form so that it may become. If comprised in this way, the deformation | transformation part 120 whole can be changed to an up-down direction.

  In the fourth embodiment, the diameter of the hole 150 is formed to be larger than the diameter of the small diameter passage 330, but the diameter of the hole 150 is the same as or smaller than the diameter of the small diameter passage 330. You may comprise so that it may become.

  In the embodiment described above, the state of the low-pressure refrigerant is detected by the power element 400 as the valve operating mechanism. Instead, the present invention may be applied to a configuration in which the state of the high-pressure refrigerant is detected by a valve operating mechanism and the valve opening is adjusted.

It is sectional drawing which showed the whole structure of the temperature type expansion valve which concerns on 1st Embodiment. It is a lower area enlarged view in FIG. It is the graph which showed the relationship between the stroke amount of an adjustment jig, and the set value change amount of a spring member. In 2nd Embodiment, it is an expanded sectional view which showed the structure of the cylindrical projection part. In 3rd Embodiment, it is an expanded sectional view which showed the structure which provided the internal thread by which an adjustment jig is screwed together in a surrounding wall. In 4th Embodiment, it is an expanded sectional view which showed the example which comprised the deformation | transformation part using the deformation | transformation board. It is sectional drawing which showed the whole structure of the ball valve type expansion valve in 5th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Expansion valve 100 ... Main body block 120 ... Deformation part 120A ... Reception surface 120B ... Action surface 130 ... Peripheral wall 130A, 140A ... Female screw 140 ... Cylindrical protrusion 150 ... Hole 160 ... Deformation plate (deformation part)
200 ... Superheat detection passage 310 ... High pressure passage 320 ... Low pressure passage 400 ... Power element 450 ... Actuating rod 600 ... Spool valve (valve element)
610: throttle passage 700 ... spring member 800 ... adjusting jig

Claims (9)

An expansion valve for a refrigeration cycle that expands the high-pressure refrigerant flowing from the high-pressure passage under reduced pressure, causes the low-pressure refrigerant after decompression and expansion to flow out into the low-pressure passage, and adjusts the refrigerant flow rate of the low-pressure refrigerant that flows out into the low-pressure passage,
A throttle passage that communicates between the high-pressure passage and the low-pressure passage, and decompresses and expands the high-pressure refrigerant;
A valve body that opens and closes the throttle passage and adjusts the flow rate of the refrigerant according to a valve opening;
A spring member for applying a biasing force to the valve body;
An expansion valve comprising: a deformable portion that sandwiches the spring member together with the valve body and is plastically deformable in an expansion / contraction direction of the spring member in accordance with an external deformation force. A main body block for accommodating the spring member;
2. The expansion valve according to claim 1, wherein the deformable portion is formed as a thin wall that is integrally formed with the main body block and is thin with respect to the expansion and contraction direction. A main body block for accommodating the spring member;
A hole is formed in a position facing the valve body in the main body block,
The deformed portion is formed of a deformed plate having substantially the same shape as the hole, and is housed in the hole so as to be fixed to the main body block. The expansion valve described in 1.   The expansion valve according to claim 3, wherein the hole is set to have a diameter larger than a diameter dimension of the spring member in a direction orthogonal to the expansion / contraction direction.   3. The working surface of the deforming portion on which a deforming force from the outside acts is set to be the same or relatively large as a receiving surface with which the spring member abuts. The expansion valve according to claim 4.   6. The expansion valve according to claim 5, wherein a thickness of the deforming portion is set to 0.5 to 2 mm, and a diameter dimension of the receiving surface is set to 7 to 20 mm. A cylindrical protrusion is formed on the working surface,
The expansion valve according to claim 5 or 6, wherein a screw portion into which an adjustment jig for applying the deformation force is screwed to the working surface is formed on the cylindrical projection portion.   The expansion valve according to claim 5 or 6, wherein a peripheral wall is formed around the working surface coaxially with the working surface.   The expansion valve according to claim 8, wherein a screw portion into which the adjustment jig is screwed is formed on the peripheral wall.

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