Thermal expansion valve

Abstract

The thermostatic expansion valve comprises a supporting component, a valve body component and a transmission component, the supporting component is located in a cavity of the valve body component and comprises a supporting frame, the supporting frame comprises a base plate part and a cylinder part, the base plate part and the cylinder part are integrated, the base plate part is fixedly connected with the valve body component, the cylinder part comprises a through hole, and the transmission component comprises a transmission rod. The transmission rod penetrates through the through hole and is in sliding fit with the through hole. The thermostatic expansion valve and the supporting frame are of an integrated structure, the part strength is improved, the lateral stress strength of the supporting frame is improved, and the product performance is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid control, in particular to a thermal expansion valve. Background Art

[0002] FIG1 is a schematic diagram of the structure of a thermal expansion valve of the background technology. The thermal expansion valve includes a power head component 1', a support component 2', a transmission component 6', and an adjustment component 5'. The support component 2' includes a sleeve 21' and a support frame 22', and the sleeve 21' and the support frame 22' are fixed by riveting. In the actual use of the thermal expansion valve of this scheme, the support component 2' is subjected to the elastic force of the spring and the thrust of the adjustment component 5', wherein the elastic force direction of the spring is the vertical direction, and the thrust of the adjustment component 5' is the horizontal direction, and the combined force of the two generates a force in the F' direction on the sleeve 21'. Utility Model Content

[0003] The purpose of the present application is to provide a thermal expansion valve, comprising: a support component, a valve body component and a transmission component, wherein the support component is located in the cavity of the valve body component, the support component comprises a support frame, the support frame comprises a base plate portion and a barrel portion, the base plate portion and the barrel portion are an integral part, the base plate is fixedly connected to the valve body component, the barrel portion comprises a through hole, the transmission component comprises a transmission rod, the transmission rod passes through the through hole, and the transmission rod and the through hole are slidably matched. In the thermal expansion valve of the present application, the base plate portion and the barrel portion of the support frame are an integral part, which improves the lateral force strength of the support frame and reduces the possibility of the transmission rod tilting due to the deflection of the support frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0004] Figure 1-1 The figure shows a schematic diagram of the structure of a thermal expansion valve in the background technology;

[0005] Figure 1-2 Shown is a partial cross-sectional schematic diagram in Figure 1;

[0006] Figure 2 Shown is a structural schematic diagram of a specific embodiment of the thermal expansion valve of the utility model;

[0007] Figure 3 Shown Figure 2 Structural schematic diagram of the middle support frame;

[0008] Figure 4 Shown Figure 2 A schematic cross-sectional view of the middle support frame in one direction;

[0009] Figure 5 Shown Figure 2 A schematic cross-sectional view of the valve body in one direction.

[0010] Figure 2-Figure 5 Symbol Explanation:

[0011] 1. Power head component;

[0012] 110. Diaphragm;

[0013] 2. Support component;

[0014] 210. Support frame;

[0015] 2110. Substrate part;

[0016] 2120. Cylindrical part;

[0017] 2121. Through hole;

[0018] 2122. Fitting section;

[0019] 2123. Transition section;

[0020] 2124. Guide section;

[0021] 3. Valve body component;

[0022] 310. Valve body;

[0023] 3110. Main body part;

[0024] 3120. First hole part;

[0025] 3130. Adjusting hole part;

[0026] 4. Spool component;

[0027] 5. Adjusting component;

[0028] 510. Adjusting head;

[0029] 6. Transmission component;

[0030] 610. Transmission rod;

[0031] 620. Transmission seat. Detailed Embodiment

[0032] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] It should be noted here that the upper and lower orientation terms involved in this article are defined based on the Figure 2 positions of the components in the figure and the relative positions of the components to each other, only for the sake of clarity and convenience of expressing the technical solution. It should be understood that the orientation terms adopted in this article should not limit the scope of protection claimed in this application.

[0034] Figure 2 Shown is a structural schematic diagram of a specific embodiment of the thermal expansion valve of the utility model; Figure 3 Shown Figure 2 Structural schematic diagram of the middle support frame; Figure 4 Shown Figure 2 A schematic cross-sectional view of the middle support frame in one direction; Figure 5 Shown Figure 2 A schematic cross-sectional view of the valve body in one direction.

[0035] like Figure 2 As shown in the figure, the thermal expansion valve includes a power head component 1, a support component 2, a valve body component 3, a valve core component 4, an adjustment component 5 and a transmission component 6.

[0036] The power head component 1 includes an upper cover 120, a lower cover 130 and a diaphragm 110 located between the upper cover 120 and the lower cover 130. The upper cover 120 and the lower cover 130 are welded and fixed. The upper cover 120 and the lower cover 130 are both made of stainless steel. The outer edge of the diaphragm 110 is fixed between the upper cover 120 and the lower cover 130.

[0037] The valve body component 3 includes a valve body 310 , and the valve body 310 includes a main body portion 3110 . The main body portion 3110 is tubular.

[0038] The support component 2 includes a support frame 210, a spring seat 220, and a spring 230. The spring seat 220 is mounted on the support frame 210, and the spring seat 220 supports the spring 230. The support component 2 is located in the cavity of the valve body 310. The support frame 210 includes a substrate portion 2110 and a barrel portion 2120. The barrel portion 2120 includes a through hole 2121. The substrate portion 2110 and the barrel portion 2120 are an integral part. The integral part here refers to a combination of two parts, such as an integral part that can be an integral casting. The support frame 210 of the present application is a precision injection part. The substrate portion 2110 is fixedly connected to the valve body component 3, such as by welding. Compared with the background technology, the tensile strength of the parts of the integral support frame 210 is improved. The substrate portion 2110 and the barrel portion 2120 of the support frame 210 are an integral part, which improves the tensile strength of the support frame 210 and improves the situation where the assembly strength of the two parts is insufficient. Furthermore, the base plate portion 2110 and the cylinder portion 2120 of the support frame 210 are an integrated piece, and the lateral force strength is improved, thereby reducing the possibility of the transmission rod 610 tilting due to the deflection of the support frame 210, improving the wear resistance of the transmission rod 610, and increasing the service life of the product.

[0039] The transmission component 6 includes a transmission rod 610 and a transmission seat 620, and the transmission rod 610 supports the transmission seat 620. The transmission rod 610 is sleeved in the through hole 2121, and the transmission rod 610 and the through hole 2121 are slidably matched. It should be noted in this solution that in order to reduce the deflection of the transmission rod 610, the clearance between the transmission rod 610 and the through hole 2121 is small enough to be ignored.

[0040] Preferably, the support frame 210 is made of stainless steel powder metallurgy or stainless steel precision injection, and the valve body 310 is made of stainless steel plate or stainless steel tube by stamping and stretching. In this solution, the through hole 2121 is made by extrusion or super-precision process, which can adjust the size and roughness and reduce the wear of the transmission rod 610.

[0041] like Figure 3 As shown, the substrate portion 2110 is arranged to extend radially outward from the barrel portion 2120, and the substrate portion 2110 is annular. The annular outer wall of the substrate portion 2110 is fixedly matched with the inner wall of the main body portion 3110. Specifically in this embodiment, the substrate portion 2110 is annular, and the main body portion 3110 is cylindrical. The outer wall of the substrate portion 2110 is fixedly connected to the inner wall of the main body portion 3110, for example, by welding.

[0042] like Figure 3 and Figure 4 As shown, the hole wall of the through hole 2121 includes a matching section 2122, a transition section 2123 and a guide section 2124, the matching section 2122 is slidably matched with the transmission rod 610, the guide section 2124 is located at the end of the through hole 2121 on the side away from the substrate portion 2110, the transition section 2123 connects the matching section 2122 and the guide section 2124, the diameter size of the matching section 2122 is defined as d1, and the diameter size of the guide section 2124 is defined as d2, then d2 is greater than d1. When arranged in this way, it is convenient to improve the assembly convenience of the transmission rod 610.

[0043] like Figure 2 The thermal expansion valve shown in the figure has an assembly method comprising the following steps:

[0044] The support frame 210 is installed in the cavity of the valve body 310, and the height of the support frame 210 is limited by the tooling. The substrate 2110 and the valve body 310 are first fixed in relative position by spot welding, and then furnace welding is performed to weld the substrate 2110 and the valve body 310 in a whole circle to improve the welding accuracy and strength. The transmission rod 610 of the transmission component 6 is installed in the through hole 2121, and the transmission rod 610 passes through the through hole 2121. The order for the transmission rod 610 to be installed into the through hole 2121 is as follows: first, it passes through the guide section 2124. The inner diameter of the guide section 2124 is larger than the outer diameter of the transmission rod 610, so that the transmission rod 610 can be easily aligned with the through hole 2121, and then passes through the transition section 2123 to further improve the concentricity between the transmission rod 610 and the through hole 2121, and finally passes through the matching section 2122. In this way, the transmission rod 610 is smoothly installed into the through hole 2121. In this solution, the setting of the guide section 2124 greatly improves the convenience of assembly.

[0045] like Figure 1-2 As shown, the height h' is related to the adjustment accuracy of the thermal expansion valve. The smaller the dimensional tolerance of the height h', the higher the adjustment accuracy of the thermal expansion valve. During spot welding positioning, the limit fixture abuts against the fixture positioning surface to meet the height h' for spot welding. Compared with the background technology, the height h' needs to accumulate the dimensional tolerances of the two parts, the support frame 22' and the sleeve 21', so the cumulative tolerance is large. In actual use, it is necessary to add a flat end surface processing process to ensure the actual use tolerance of the height h'. The new thermal expansion valve of the present application provides a new support frame 210. When the one-piece support frame 210 is spot welded using the limit fixture, the part tolerance is only the support frame 210 itself, and there is no need to accumulate. The tolerance is controllable. In addition, in the solution of the present application, the support frame 210 is precision injected, and the part dimensional accuracy is guaranteed. There is no need to add a flat end surface process after spot welding, making the product assembly more efficient and simplified.

[0046] like Figure 4 , Figure 5 As shown, the wall thickness of the main body 3110 is defined as t1, and the wall thickness of the substrate 2110 is defined as t2, then 2t1≤t2≤4t1 is satisfied. If the wall thickness of the substrate 2110 is too small, the fixing strength during spot welding is insufficient, and if the wall thickness of the substrate 2110 is too large, it will affect the flow space in the cavity of the valve body 310.

[0047] like Figure 2 , Figure 4As shown, the valve body 310 further includes a first hole portion 3120 and an adjustment hole portion 3130, and along the longitudinal direction of the thermal expansion valve, the substrate portion 2110 is located between the first hole portion 3120 and the adjustment hole portion 3130. That is, in the cavity of the valve body 310, the substrate portion 2110 separates the first hole portion 3120 and the adjustment hole portion 3130 at the upper and lower sides. The thermal expansion valve further includes an adjustment component 5, and the valve body component 3 further includes a first connecting pipe 320. The adjustment component 5 is arranged opposite to the adjustment hole portion 3130, and the first connecting pipe 320 is arranged opposite to the first hole portion 3120. The adjustment component 5 includes an adjustment head 510, and the adjustment head 510 partially passes through the adjustment hole portion 3130. When the thermal expansion valve needs to be adjusted using the adjustment component 5, the adjustment head 510 can be twisted to make the adjustment head 510 move horizontally through the adjustment hole portion 3130 and contact the spring seat 220. The support frame 210 supports the spring seat 220, and the spring seat 220 supports the spring 230. When the adjusting head 510 moves horizontally to the bottom of the spring seat 220, the spring seat 220 moves toward the diaphragm, compressing the spring 230 upward, so that the transmission seat 620 is forced upward, and the height position of the diaphragm 110 is adjusted to achieve the adjustment of the initial superheat.

[0048] like Figure 2 As shown, one end of the valve body 310 is fixedly connected to the power head component 1, and the other end of the valve body 310 is fixedly connected to the valve core component 4. In this embodiment, the valve body 310 and the power head component 1 are fixed by welding, such as laser welding, and the valve body 310 and the valve core component 4 are fixed by welding, such as laser welding.

[0049] The transmission component 6 is located between the diaphragm 110 and the valve core component 4. The transmission seat 620 of the transmission component 6 can abut against the diaphragm 110, and the other end of the transmission component 6 can abut against the valve core component 4. The transmission component 6 in this solution includes the transmission seat 620. In the specified working state of the thermal expansion valve, the diaphragm 110 pushes the transmission seat 620 to move in the direction of the valve core component 4, and the transmission seat 620 contacts the support frame 210 with one end face facing the valve core component 4 to limit the transmission seat from continuing to move in the direction of the valve core component 4. Therefore, the width W of the abutment surface of the support frame 210 that can abut against the transmission seat 620 should be as large as possible under the condition that d2 is greater than d1. Such a setting can ensure that the transmission seat 620 is more stable and reliable when the abutment is limited. In the specified working state of the thermal expansion valve, the pressure in the cavity of the power head component 1 changes, causing the diaphragm 110 to deform and abut the transmission seat 620 against the transmission rod and drive the transmission rod 610 against the valve core component 4 to adjust the opening of the thermal expansion valve and adjust the refrigerant flow.

[0050] The above is only an explanation of a specific embodiment of the present utility model. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present utility model. These improvements and modifications should also be regarded as the protection scope of the present utility model.

Claims

1. A thermal expansion valve, characterized in that: include: A support component (2), a valve body component (3) and a transmission component (6), wherein the support component (2) is located in a cavity of the valve body component (3), the support component (2) comprises a support frame (210), the support frame (210) comprises a base plate portion (2110) and a cylinder portion (2120), the base plate portion (2110) and the cylinder portion (2120) are an integral part, the base plate portion (2110) is fixedly connected to the valve body component (3), the cylinder portion (2120) comprises a through hole (2121), and the transmission component (6) comprises a transmission rod (610), the transmission rod (610) passes through the through hole (2121), and the transmission rod (610) is slidably matched with the through hole (2121).

2. The thermal expansion valve according to claim 1, characterized in that: The support frame (210) is a stainless steel powder metallurgy part or a stainless steel precision injection part.

3. The thermal expansion valve according to any one of claims 1 or 2, characterized in that: The substrate portion (2110) is annular and extends radially outward from the barrel portion (2120). The valve body component (3) includes a valve body (310). The valve body (310) includes a main body portion (3110). The main body portion (3110) is tubular. The side wall of the substrate portion (2110) is welded and fixed to the inner wall of the main body portion (3110).

4. The thermal expansion valve according to claim 3, characterized in that: The hole wall of the through hole (2121) comprises a matching section (2122), a transition section (2123) and a guide section (2124); the matching section (2122) is slidably matched with the outer wall surface of the transmission rod (610); the guide section (2124) is located at the end of the through hole (2121) away from the substrate portion (2110); the transition section (2123) connects the matching section (2122) and the guide section (2124); the diameter dimension of the matching section (2122) is defined as d1, and the diameter dimension of the guide section (2124) is defined as d2, then d2 is greater than d1.

5. The thermal expansion valve according to claim 3, characterized in that: The valve body (310) is made of a stainless steel plate or a stainless steel tube by stamping and stretching. The wall thickness of the main body (3110) is defined as t1, and the wall thickness of the substrate (2110) is defined as t2, then 2t1≤t2≤4t1 is satisfied.

6. The thermal expansion valve according to claim 4, characterized in that: The valve body (310) further comprises a first hole portion (3120) and an adjusting hole portion (3130); along the longitudinal direction of the thermal expansion valve, the substrate portion (2110) is located between the first hole portion (3120) and the adjusting hole portion (3130); the thermal expansion valve further comprises an adjusting component (5); the valve body component (3) further comprises a first connecting pipe (320); the adjusting component (5) and the adjusting hole portion (3130) are arranged opposite to each other; the first connecting pipe (320) and the first hole portion ( 3120) are arranged relatively to each other, the adjusting component (5) includes an adjusting head (510), and the adjusting head (510) partially passes through the adjusting hole (3130), the supporting component (2) includes a spring seat (220) and a spring (230), the supporting frame (210) supports the spring seat (220), and the spring seat (220) supports the spring (230), and the adjusting head (510) can move horizontally and push the spring seat (220) to compress the spring (230).

7. The thermal expansion valve according to claim 6, characterized in that: It also includes a power head component (1) and a valve core component (4); one end of the valve body component (3) is fixedly connected to the power head component (1); the other end of the valve body component (3) is fixedly connected to the valve core component (4); the power head component (1) includes a diaphragm (110); one end of the transmission component (6) can abut against the diaphragm (110); and the other end of the transmission component (6) can abut against the valve core component (4).

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