Thermostatic expansion valve

Abstract

The utility model provides a kind of thermal expansion valve, improve valve core structure, reduce the processing difficulty of the preset leakage structure formed by thermal expansion valve. Thermal expansion valve includes valve core structure, valve core structure includes intercommunication groove and side core wall, and side core wall is equipped with sealing area;Intercommunication groove is concave relative to side core wall, and the slot of intercommunication groove is located side core wall;Slot extends along the first direction of thermal expansion valve and penetrates through sealing area, part slot is located in one side of sealing area, and part slot is located in the other side of sealing area.

Description

Technical Field

[0001] This utility model relates to the field of valve technology for refrigeration systems, specifically to a thermostatic expansion valve. Background Technology

[0002] In refrigeration and heat pump systems, the thermostatic expansion valve is a core flow control component. As the requirements for flow control of thermostatic expansion valves become increasingly sophisticated, the fabrication of structures that achieve preset leakage rates presents challenges. Utility Model Content

[0003] The purpose of this invention is to provide a thermostatic expansion valve that reduces the processing difficulty of forming a preset leakage capacity structure by improving the valve core structure.

[0004] To achieve the above objectives, a thermostatic expansion valve is provided, including a valve core structure. The valve core structure includes a connecting groove and a side core wall, and the side core wall has a sealing area. The connecting groove is recessed relative to the side core wall, and the groove opening is located on the side core wall. The groove opening extends along a first direction of the thermostatic expansion valve and passes through the sealing area, with part of the groove opening located on one side of the sealing area and part of the groove opening located on the other side of the sealing area.

[0005] By opening a connecting groove on the side of the valve core structure, the valve core structure can have a preset leakage amount, which reduces the processing difficulty of forming a preset leakage amount structure in the thermostatic expansion valve.

[0006] Other features and advantages of this specification will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0007] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of this specification and, together with their description, serve to explain the principles of this specification.

[0008] Figure 1 This is a schematic diagram of the structure of the thermal expansion valve in an embodiment of this utility model;

[0009] Figure 2 yes Figure 1 A magnified view of a portion of the image;

[0010] Figure 3 This is a side view of the valve core structure;

[0011] Figure 4 yes Figure 3 A partial cross-sectional view;

[0012] Figure 5 yes Figure 4 LL-direction cross-section.

[0013] Figure label:

[0014] 1-Valve body; 11-Valve core seat; 11a-Valve port; 1a-First chamber; 1b-Second chamber; 12-Spring support seat; 121-Inner hole; 13-Valve core spring; 14-Filter screen; 15-Outlet connector; 16-Driver; 161-Drive diaphragm; 162-Drive rod; 18-Inlet connector;

[0015] 2-Valve core structure; 21-Conical section; 21a-Side core wall; 22-Connecting groove; 22a-Groove opening; 22b-Groove bottom; 23-Matching section; 24-Conical frustum; 25-Spring guide section; s2-Central axis. Detailed Implementation

[0016] This invention provides a thermostatic expansion valve, which improves the stability of the thermostatic expansion valve by improving the valve core structure.

[0017] To enable those skilled in the art to better understand the present invention, this application will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of the invention.

[0018] Relational terms such as “first” and “second” are used merely to distinguish one component from another that has the same name, without necessarily requiring or implying any such actual relationship or order between the components.

[0019] In related technologies, a thermostatic expansion valve has a valve core located inside the valve body to seal the valve port. With the valve port sealed, the valve cavity is divided into at least two spaced-apart chambers by the valve core. A channel is provided in the central axial portion of the valve core, allowing the two chambers to communicate with each other even when the valve port is sealed. The diameter of the channel is related to the leakage rate at the valve port when sealed.

[0020] To process this channel, drilling is required. Since the diameter of the hole is affected by the diameter of the drill bit, different diameter drill bits need to be selected to deal with different leakage amounts.

[0021] For example, as valve opening values ​​become increasingly refined (e.g., the valve opening value of some thermostatic expansion valves is less than 1.0 mm, 0.5 mm-1.0 mm, or less than 0.5 mm), the diameter of the borehole needs to be reduced accordingly, making it difficult for standard-sized drill bits to meet processing requirements.

[0022] Please refer to Figures 1 to 5 , Figure 1 This is a schematic diagram of the structure of the thermal expansion valve in an embodiment of this utility model; Figure 2 yes Figure 1A magnified view of a portion of the image; Figure 3 This is a side view of the valve core structure; Figure 4 yes Figure 3 A partial cross-sectional view; Figure 5 yes Figure 4 LL-direction cross-section.

[0023] like Figure 1 , Figure 2 , Figure 3 as well as Figure 4 As shown, the valve core structure 2 has an outer wall, defined as the side core wall 21a. The side core wall 21a has a sealing area. That is, the portion of the side core wall 21a that abuts against the valve port portion 11a (described later) serves as the sealing area. The valve core structure 2 also has a connecting groove 22, which connects two chambers separated by the valve core structure 2 when the valve port portion 11a is closed. The connecting groove 22 is formed by a recess in the side core wall 21a, and the side core wall 21a has a slot 22a that communicates with the connecting groove 22.

[0024] The groove 22a extends along the first direction and penetrates the sealing area. Along the first direction, part of the groove 22a is located on one side of the sealing area, and part of the groove 22a is located on the other side of the sealing area.

[0025] The first direction can be the longitudinal direction of the thermostatic expansion valve, or it can be a direction that is offset by a certain angle relative to the thermostatic expansion valve. Specifically, the valve core structure 2 moves along the longitudinal direction of the thermostatic expansion valve to open or close the valve port 11a, and the moving direction of the valve core structure 2 is the longitudinal direction of the thermostatic expansion valve.

[0026] In one specific embodiment, the valve body 1 encloses and defines a valve cavity, within which a valve core seat 11 is disposed, dividing the valve cavity into a first cavity 1a and a second cavity 1b. A valve port 11a is disposed on the valve core seat 11, and when the valve port 11a is open, the first cavity 1a and the second cavity 1b are in communication. The valve core structure 2 is used to abut against or move away from the valve core seat 11 to close or open the valve port 11a.

[0027] The valve core structure 2 specifically includes a sealing area for sealing the valve port 11a. The sealing area can be a sealing line or a sealing surface. That is, the valve core structure 2 and the valve port 11a can be a line seal or a surface seal. The connecting groove 22 passes through the sealing line or sealing surface, and its two ends extend beyond the corresponding edges of the sealing line or sealing surface, which can achieve leakage of the valve core structure 2.

[0028] With the valve port 11a closed, part of the slot 22a is located in the first cavity 1a and part is located in the second cavity 1b. The middle part of the slot 22a passes through the sealing area. Thus, the connecting slot 22 forms a flow channel for the medium to flow. When the valve core structure 2 abuts against the valve port 11a, the first cavity 1a and the second cavity 1b are connected through the connecting slot 22.

[0029] By creating a connecting groove 22 on the side of the valve core structure 2, the connecting groove 22 ensures that the valve core structure 2 has a set leakage amount when it abuts against the valve port 11a. Furthermore, choosing to create a groove on the side of the valve core structure 2 to achieve leakage reduces manufacturing difficulty and increases efficiency.

[0030] In the aforementioned embodiment, the sealing area is located on the side core wall 21a of the valve core structure 2 and is used to abut against the wall of the valve port portion 11a. The sealing area refers to the area where the side wall of the valve core structure 2 abuts against the wall of the valve port portion 11a. Within the area where the two abut against each other, the connecting groove 22 passes through and passes through the sealing area on both sides in the axial direction, thereby realizing the leakage of the valve core structure 2.

[0031] like Figure 4 As shown, the valve core structure 2 has a central axis s2, and the connecting groove 22 is recessed from the sidewall toward the central axis s2. The recessed direction of the connecting groove 22 is taken as its depth direction (e.g., Figure 4 (as shown in the LL direction). In the depth direction, the connecting groove 22 has a groove bottom 22b opposite to the groove opening 22a. The groove bottom 22b of the connecting groove can be a linear groove bottom 22b or a surface groove bottom 22b. The depth direction of the connecting groove 22 is perpendicular to the side core wall 21a, which further facilitates processing.

[0032] The depth direction of the connecting groove 22 can be perpendicular to the central axis s2 or arranged at an acute or obtuse angle to the central axis s2. This depends on the specific structure of the valve core structure 2. For example, when the valve core structure 2 is a cylinder, the depth direction of the connecting groove 22 is perpendicular to the central axis s2. When the valve core structure 2 is a cone as described below, the depth direction of the connecting groove 22 is arranged at an acute or obtuse angle to the central axis s2.

[0033] For example, the surface of the bottom 22b of the connecting groove 22 is parallel to the core sidewall. That is, when the core sidewall is parallel to the central axis s2, the valve core structure 2 has a cylindrical portion with a sealing area. For example, when the core sidewall intersects the central axis s2 at an acute or obtuse angle, the portion of the valve core structure 2 that forms the sealing area can be a cone; of course, it can also be that the core sidewall is perpendicular to the central axis s2. In this case, the portion of the valve core structure 2 with the sealing area is pressed axially against the valve port 11a, and the valve core structure 2 is no longer inserted into the valve port 11a. In all the above examples, the bottom 22b of the connecting groove 22 is parallel to the core sidewall.

[0034] As some optional implementations, the connecting groove 22 extends axially in a straight line, a bent line, or an irregular shape. In this embodiment, the connecting groove 22 extends along the generatrix direction of the conical segment 21, that is, the generatrix direction of the conical segment 21 is the aforementioned first direction. A cross-section is formed along the depth direction of the connecting groove 22, and the cross-section can be gradually transitioned, stepped, or irregularly transitioned in the extension direction of the connecting groove 22. Those skilled in the art can choose according to their needs. The connecting groove 22 can extend in any shape axially to maintain the leakage of the valve core structure 2.

[0035] In the relevant technical solutions, the method of machining channels in the central shaft of valve core structure 2 also increases the machining difficulty due to the use of stainless steel in the valve core structure. This is because stainless steel, due to its resilience, is difficult to machine and cannot meet the leakage requirements of precision thermal expansion valves.

[0036] The valve core structure 2 of this application is made of stainless steel, and the connecting groove 22 is a milled structure. Compared with the valve core structure 2 made of brass, the stainless steel valve core structure 2 has excellent corrosion resistance, higher hardness and wear resistance, and good pressure resistance. The valve core structure 2 made of stainless steel has better adaptability and stability in refrigeration and heat pump systems, and can meet the needs of various complex operating conditions.

[0037] The following detailed embodiments, with reference to the accompanying drawings, further illustrate the technical solutions of this application. It should be noted that these embodiments are for illustrative purposes only and are not intended to limit the scope of the technical solutions of this application. Those skilled in the art can combine the following embodiments with the previous embodiments in part or in whole, and all technical solutions derived from such combinations fall within the protection scope of this patent.

[0038] In such Figure 1In the example shown, the thermostatic expansion valve includes a valve body 1, a valve core seat 11 disposed within the valve body 1, and a valve core structure 2. The valve core seat 11 has a cylindrical structure, is made of stainless steel, and is a stamped part. A valve port 11a is formed on the valve core seat 11, which divides the valve chamber of the thermostatic expansion valve into a first chamber 1a and a second chamber 1b. The inner cavity of the valve core seat 11 serves as the first chamber 1a. When the valve core structure 2 abuts against the valve port 11a, a connecting groove 22 connects the first chamber 1a and the second chamber 1b.

[0039] The valve core seat is made of stainless steel, which can improve the performance of the thermal expansion valve. The connecting groove 22 set in the valve core structure 2 connects the first chamber 1a and the second chamber 1b in the closed state to meet the preset leakage amount.

[0040] like Figure 1 As shown, the valve core structure 2 is at least partially disposed in the first cavity 1a and can move axially toward the valve port 11a to partially insert into the valve port 11a to block it, or move axially toward the valve port 11a away from it, so that the medium in the first cavity 1a can enter the second cavity 1b through the valve port 11a.

[0041] The first cavity 1a has a medium inlet, which is connected to the inlet pipe 18. The first cavity 1a is also provided with a spring support seat 12, a valve core spring 13 with one end abutting against the spring support seat 12 and the other end abutting against the valve core structure 2, and a filter screen 14. The spring support seat 12 has an inner hole 121 that communicates with the first cavity 1a.

[0042] The medium from the inlet pipe 18 passes through the medium inlet → filter screen 14 → inner hole 121 of spring support seat 12 → first cavity 1a.

[0043] A second chamber 1b is defined between the spring support seat 12 and the valve body 1. The second chamber 1b has a medium outlet, which is connected to the outlet pipe 15.

[0044] The second cavity 1b is also equipped with a driving component 16, which includes a driving diaphragm 161 and a driving rod 162 that is pulsatorically connected to the driving diaphragm 161. The bottom end of the driving rod 162 abuts against the end of the valve core structure 2 that is away from the spring support seat 12. Under the drive of the driving diaphragm 161, the axial displacement of the driving rod 162 is transmitted to the valve core structure 2, thereby causing the valve core structure 2 to open or close the valve port 11a.

[0045] The valve core structure 2 in this embodiment will be described in detail below.

[0046] like Figure 2 , Figure 3 and Figure 4As shown, a conical section 21 is provided in the middle of the valve core structure 2. The outer diameter of the conical section 21 decreases upward along the longitudinal direction of the thermostatic expansion valve. The sealing area is located on the conical surface of the conical section 21, which serves as the side core wall 21a of the valve core structure 2. The position where the valve core structure 2 seals with the valve port 11a is a conical structure. Through its cooperation with the circular valve port 11a, the valve port 11a can be sealed with low flow rate and high precision.

[0047] In the example shown, the side core wall 21a has a certain yaw angle relative to the central axis s2, the plane containing the groove bottom 22b is parallel to the conical surface, and the depth direction of the connecting groove 22 is perpendicular to the conical surface. Here, "perpendicular" means that the depth direction of the connecting groove 22 is perpendicular to the surface tangent to the conical surface. The cross-section formed by the connecting groove 22 along its depth direction is triangular or trapezoidal.

[0048] The valve core structure 2 also includes a mating section 23, the inner diameter of which is smaller than that of the valve port 11a, and is adapted to fit the drive rod 162 along the longitudinal direction of the thermostatic expansion valve. The valve core structure 2 also includes a conical frustum 24, which axially presses against the valve core spring 13. The valve core structure 2 further includes a spring guide section 25, which extends into the interior of the valve core spring 13, thereby guiding the valve core spring 13 as it moves axially, thus limiting the relative movement space between the valve core spring 13 and the valve core structure 2 in the radial direction of the valve core seat 11.

[0049] The conical section 21 abuts against the valve port 11a to form a sealing line, the sealing line being... Figure 2 The position indicated by the dashed line s1. In the axial direction of the valve core seat 11, the connecting groove 22 passes through the sealing line and extends along the depth direction. The two ends of the connecting groove 22 extend beyond the sealing area, with one end located on the side of the sealing line near the second cavity 1b, or inside the second cavity 1b, and the other end located on the side of the sealing line near the first cavity 1a, or inside the first cavity 1a.

[0050] By employing the thermostatic expansion valve of the valve core structure 2 in this application, when the conical section 21 abuts against the valve port 11a, the medium can still achieve throttling and pressure reduction through the connecting groove 22 formed on the valve core structure 2, so that the refrigeration system still has a certain amount of circulation and ensures that the compressor can still work normally.

[0051] In the technical solution of this embodiment, the diameter of the valve port 11a is less than or equal to 1.0 mm.

[0052] Alternatively, the diameter of the valve port 11a can be less than or equal to 0.5 mm. When the diameter is less than or equal to 0.5 mm, the method of machining the connecting groove 22 can achieve more precise control of the thermostatic expansion valve. In this case, the technical solution of this application can reduce the machining difficulty of the connecting groove 22.

[0053] Alternatively, the diameter of the valve port 11a can be between 0.5 mm and 1.0 mm, including the end value. Within this range, fine-grained flow control can be achieved. In this case, using the technical solution of this application, it is also possible to ensure that the valve core structure 2 achieves the preset leakage amount.

[0054] By adopting the valve core structure 2 in this application, the processing method of the thermostatic expansion valve with a small opening value can be simplified, thereby reducing the cost of the valve core structure 2.

[0055] In the aforementioned technical solution, the valve body 1 is made of stainless steel. The stainless steel valve body 1 improves the adaptability of the thermostatic expansion valve. For the stainless steel valve body 1, when the valve port 11a opening value is small, the method of setting the connecting groove 22 in the valve core structure 2 enables more precise adjustment of the leakage of the valve core structure 2.

[0056] In this embodiment, a milling process is used to machine a connecting groove 22 on the side of the valve core structure 2, with the cutting direction perpendicular to the core sidewall to form a V-shaped groove. The machining depth of the connecting groove 22, i.e., the depth of the connecting groove 22 within the valve core structure 2, can be adjusted. Figure 4 The depth in the LL direction is used to change the amount of leakage. The machining depth here refers to the depth of the indentation of the connecting groove 22 from the sidewall toward the central axis s2.

[0057] In such Figure 5 In the example shown, the connecting groove 22 is cut along its depth direction to form a fan-shaped cross section. In this embodiment, the leakage of the connecting groove 22 can also be adjusted by adjusting the included angle α of the fan shape (that is, the width of the connecting groove 22).

[0058] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A thermostatic expansion valve, characterized in that, It includes a valve core structure (2), the valve core structure (2) includes a connecting groove (22) and a side core wall (21a), the side core wall (21a) is provided with a sealing area; The connecting groove (22) is recessed relative to the side core wall (21a), and the groove opening (22a) of the connecting groove (22) is located on the side core wall (21a); The slot (22a) extends along a first direction of the thermal expansion valve and penetrates the sealing area. Along the first direction, part of the slot (22a) is located on one side of the sealing area, and part of the slot (22a) is located on the other side of the sealing area.

2. The thermostatic expansion valve according to claim 1, characterized in that, The connecting groove (22) also has a groove bottom (22b) opposite to the groove opening (22a), and the plane where the groove bottom (22b) is located is parallel to the side core wall (21a).

3. The thermostatic expansion valve according to claim 2, characterized in that, The valve core structure (2) includes a conical section (21), the outer diameter of which decreases upward along the longitudinal direction of the thermostatic expansion valve, and the conical surface of the conical section serves as the side core wall (21a).

4. The thermostatic expansion valve according to claim 3, characterized in that, The bottom of the groove (22b) is a linear groove bottom (22b) or a surface groove bottom (22b), and the cross section of the connecting groove (22) along the depth direction of the connecting groove (22) is triangular or trapezoidal.

5. The thermostatic expansion valve according to claim 2, characterized in that, The groove (22a) and the groove bottom (22b) are distributed opposite to each other along the depth direction of the connecting groove (22); the depth direction is perpendicular to the side core wall (21a).

6. The thermostatic expansion valve according to claim 2, characterized in that, It also includes a valve core seat (11) and a drive rod (162). The top of the valve core seat (11) includes a valve port (11a). The valve core structure (2) also includes a mating section (23). The inner diameter of the mating section (23) is smaller than that of the valve port (11a). In the longitudinal direction of the thermostatic expansion valve, the mating section (23) abuts against the drive rod (162).

7. The thermostatic expansion valve according to any one of claims 1-6, characterized in that, The sealing area is a sealing line surrounding the valve core structure (2); or, The sealing area is the sealing surface surrounding the valve core structure (2).

8. The thermostatic expansion valve according to any one of claims 1-6, characterized in that, The valve core structure (2) is made of stainless steel, and the connecting groove (22) is a milled structure; the longitudinal direction of the thermal expansion valve is taken as the first direction; or the direction in which the thermal expansion valve deflects at a certain angle relative to the longitudinal direction of the thermal expansion valve is taken as the first direction.

9. The thermostatic expansion valve according to claim 8, characterized in that, It also includes a valve core seat (11), which has a cylindrical structure and is made of stainless steel. The valve core seat (11) is a stamped part. The top of the valve core seat (11) includes a valve port (11a). The valve core seat (11) divides the valve cavity of the thermostatic expansion valve into a first cavity (1a) and a second cavity (1b). The inner cavity of the valve core seat (11) serves as the first cavity (1a). When the valve core structure (2) abuts against the valve port (11a), the connecting groove (22) connects the first cavity (1a) and the second cavity (1b).

10. The thermostatic expansion valve according to claim 9, characterized in that, The diameter of the valve port (11a) is less than or equal to 1.0 mm; or, The diameter of the valve port (11a) is less than or equal to 0.5 mm; or, The diameter of the valve port (11a) is between 0.5 mm and 1.0 mm, including the end value.

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