Reciprocating compressor and refrigerator

Abstract

The utility model provides a kind of reciprocating compressor and refrigerator, reciprocating compressor includes cylinder head subassembly, cylinder head subassembly includes the air cylinder cover, exhaust valve piece and valve plate of sequentially stacking, first exhaust through-hole is formed on valve plate, exhaust valve piece includes valve piece body and the first valve tongue for controlling the on-off of first exhaust through-hole, exhaust cavity is formed in air cylinder cover, and the cavity inner wall of exhaust cavity has first lift limit post for limiting the opening angle of first valve tongue, air cylinder cover has the assembly ring table of the cavity mouth around exhaust cavity is arranged, assembly ring table has the first pressure holding plane corresponding with the tongue root position of first valve tongue, the inside edge of first pressure holding plane is pressed on the connecting line of the tongue root of first valve tongue and valve piece body. The utility model first pressure holding plane can form reliable and accurate pressure holding to the tongue root position of first valve tongue, ensure the position accuracy of the deformation starting point of first valve tongue, ensure that the actual stiffness of first valve tongue and theoretical stiffness remain consistent.

Description

Technical Field

[0001] This utility model belongs to the field of compressor design technology, specifically relating to a reciprocating compressor and a refrigerator. Background Technology

[0002] The cylinder head is an important component of the compressor cylinder head assembly, serving to seal, muffle, and control intake and exhaust. In conventional cylinder head assemblies, such as... Figure 8 As shown, an exhaust valve plate and a lift limiter are assembled on a valve plate. This type of exhaust structure is prone to problems such as loose lift limiter, failure to pass leak detection leading to low reliability of the exhaust valve plate, and low assembly efficiency due to the large number of parts. In order to overcome the aforementioned technical shortcomings, related technologies have proposed to integrally mold the lift limiter into the inner cavity of the compressor cylinder head. This eliminates the need for separate assembly of the lift limiter, significantly reduces the number of assembly parts, prevents loosening and leakage of the lift limiter, and improves the working reliability of the exhaust valve plate. However, the inventors found that because the tongue root position of the valve tongue on the exhaust valve plate is not accurately and reliably limited, the actual stiffness of the valve tongue after assembly deviates significantly from the theoretical stiffness (calculated stiffness), which in turn causes the compressor's exhaust curve to deviate from the design value. Utility Model Content

[0003] Therefore, this utility model provides a reciprocating compressor and refrigerator, which can overcome the shortcomings of the related technology where the compressor lacks accurate and reliable limiting of the position of the valve tongue root on the exhaust valve plate, resulting in a large deviation between the actual stiffness and theoretical stiffness of the exhaust valve plate after assembly, and a large deviation of the compressor's exhaust curve from the design value.

[0004] To address the aforementioned problems, this utility model provides a reciprocating compressor, including a cylinder head assembly. The cylinder head assembly includes a cylinder head, an exhaust valve plate, and a valve plate stacked sequentially. A first exhaust through hole is formed on the valve plate. The exhaust valve plate includes a valve plate body and a first valve tongue connected thereto and used to control the opening and closing of the first exhaust through hole. An exhaust chamber is formed inside the cylinder head, and the inner wall of the exhaust chamber has a first lift limiting post for limiting the opening angle of the first valve tongue. The cylinder head has an assembly ring platform arranged around the opening of the exhaust chamber. The assembly ring platform has a first pressing plane corresponding to the position of the tongue root of the first valve tongue. The inner edge of the first pressing plane presses against the connection line between the tongue root of the first valve tongue and the valve plate body.

[0005] In some embodiments, a first groove is formed between the first lift limiting post and the first pressing plane; and / or, the first lift limiting post is integrally formed on the inner wall of the exhaust chamber.

[0006] In some embodiments, a second exhaust through-hole and a third exhaust through-hole are further formed on the valve plate, a second valve tongue configured to control the on-off of the second exhaust through-hole and a third valve tongue configured to control the on-off of the third exhaust through-hole are further connected to the valve plate body, a second lift limiting post and a third lift limiting post that respectively limit the opening angles of the second valve tongue and the third valve tongue are further integrally formed on the inner cavity wall of the exhaust cavity.

[0007] In some embodiments, the assembly annular platform further has a second pressing plane corresponding to the root position of the second valve tongue and a third pressing plane corresponding to the root position of the third valve tongue, the inner edge of the second pressing plane presses against the connecting line between the root of the second valve tongue and the valve sheet body, and the inner edge of the third pressing plane presses against the connecting line between the root of the third valve tongue and the valve sheet body.

[0008] In some embodiments, a second groove is formed between the second lift limiting post and the second pressing plane, and / or a third groove is formed between the third lift limiting post and the third pressing plane.

[0009] In some embodiments, the cylinder head has an axis of symmetry, the first valve tongue is symmetrical left and right about the axis of symmetry, and the second valve tongue and the third valve tongue are symmetrical left and right about the axis of symmetry; and / or, the lift limiting surfaces of the first lift limiting post, the second lift limiting post and the third lift limiting post are arc surfaces that gradually get closer to the inner side of the exhaust cavity from the corresponding valve tongue root to the valve head side.

[0010] In some embodiments, the valve tongue length of the first valve tongue is less than the valve tongue length of the second valve tongue, and the valve tongue lengths of the second valve tongue and the third valve tongue are equal.

[0011] In some embodiments, when projected on any radial plane of the cylinder head, the distance between the hole center of the first exhaust through-hole and the side wall of the first lift limiting post away from the first exhaust through-hole is K2, the limiting head of the first lift limiting post corresponding to the first exhaust through-hole is a semicircle with diameter D2, and 0.7<K2 / D2<1; and / or, the distance between the hole center of the second exhaust through-hole and the side wall of the second lift limiting post away from the second exhaust through-hole is K1, the limiting head of the second lift limiting post corresponding to the second exhaust through-hole is a semicircle with diameter D1, and 0.7<K1 / D1<1; and / or, the distance between the hole center of the third exhaust through-hole and the side wall of the third lift limiting post away from the third exhaust through-hole is K3, the limiting head of the third lift limiting post corresponding to the third exhaust through-hole is a semicircle with diameter D3, and 0.7<K3 / D3<1.

[0012] In some embodiments, the lift of at least one of the first, second, and third lift limiting posts is H, and the diameter of at least one of the first, second, and third exhaust through holes is D, 0.12. <H / D<0.28。

[0013] This utility model also provides a refrigerator, including the above-mentioned reciprocating compressor.

[0014] The reciprocating compressor and refrigerator provided by this utility model have the following beneficial effects:

[0015] The portion of the cylinder head's assembly ring corresponding to the root position of the first valve tongue, i.e., the aforementioned first pressing plane, can reliably and accurately press the root position of the first valve tongue together with the valve plate when the cylinder head is in the assembly state. This ensures the accuracy of the deformation starting point of the first valve tongue, thereby ensuring that the actual stiffness of the first valve tongue is consistent with the theoretical stiffness, and thus ensuring that the compressor's exhaust curve is consistent with the design value. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. The drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0017] Figure 1 This is a structural disassembly diagram of the cylinder head assembly of a reciprocating compressor in one embodiment of the present invention;

[0018] Figure 2 yes Figure 1 A schematic diagram of the internal structure of the cylinder head (projected onto any radial plane, where the radial direction refers to the plane perpendicular to the axis of the exhaust port);

[0019] Figure 3 yes Figure 2 A magnified view of a section at point A in the middle;

[0020] Figure 4 yes Figure 1 A schematic diagram showing the dimensions of the internal structure of the cylinder head.

[0021] Figure 5 yes Figure 4 A magnified view of a section at point B in the middle;

[0022] Figure 6 yes Figure 1 A schematic diagram (sectional view) of the internal structure of the cylinder head assembly in the assembled state;

[0023] Figure 7 yes Figure 6 A magnified view of a section at point C;

[0024] Figure 8 This is an exploded view of the cylinder head assembly in a reciprocating compressor in the prior art.

[0025] The attached figures are labeled as follows:

[0026] 1. Cylinder head; 10. Exhaust chamber; 11. First lift limit post; 12. Assembly ring platform; 121. First pressing plane; 122. First groove; 123. Second pressing plane; 124. Third pressing plane; 125. Second groove; 126. Third groove; 13. Second lift limit post; 14. Third lift limit post; 15. Intake chamber;

[0027] 2. Exhaust valve plate; 21. Valve plate body; 22. First valve tongue; 23. Second valve tongue; 24. Third valve tongue; 25. Intake passage;

[0028] 3. Valve plate; 31. First exhaust port; 32. Second exhaust port; 33. Third exhaust port; 34. Intake port; 4. Intake valve plate;

[0029] 41. Intake valve tongue; 42. Exhaust passage. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0031] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0032] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90° or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0033] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0034] See also Figures 1 to 7 As shown in the figure, according to an embodiment of the present invention, a reciprocating compressor is provided, including a cylinder head assembly (not indicated in the figure). The cylinder head assembly includes a cylinder head 1, an exhaust valve plate 2, a valve plate 3, and an intake valve plate 4 stacked sequentially. A first exhaust through hole 31 is formed on the valve plate 3. The exhaust valve plate 2 includes a valve plate body 21 and a first valve tongue 22 connected thereto and used to control the opening and closing of the first exhaust through hole 31. An exhaust chamber 10 is formed inside the cylinder head 1, and the inner wall of the exhaust chamber 10 has a first lift limiting post 11 for limiting the opening angle of the first valve tongue 22. The cylinder head 1 has an opening surrounding the exhaust chamber 10. The mounting ring 12, as understood, not only achieves structural matching and connection between the cylinder head 1 and the exhaust valve plate 2, but also seals the exhaust chamber 10. The mounting ring 12 has a first pressing plane 121 corresponding to the tongue root position of the first valve tongue 22. The inner edge of the first pressing plane 121 presses against the connection line between the tongue root of the first valve tongue 22 (not indicated in the figure) and the valve plate body 21. In a specific embodiment, the first valve tongue 22 and the valve plate body 21 are an integral structure; in this case, the aforementioned connection line is also the boundary line between the first valve tongue 22 and the valve plate body 21 (e.g., ...). Figure 1 (as indicated by b in the text), and it can be understood that the root of the aforementioned first valve tongue 22 is also the valve tongue entity corresponding to the boundary line, and the aforementioned inner edge is as follows: Figure 2 The 'a' in the figure refers to the cylinder head 1 relative to its inner or outer sides.

[0035] In this technical solution, the portion of the cylinder head 1 with the assembly ring 12 corresponding to the tongue root position of the first valve tongue 22, namely the aforementioned first pressing plane 121, can reliably and accurately press the tongue root position of the first valve tongue 22 together with the valve plate 3 when the cylinder head 1 is in the assembly state, ensuring the accuracy of the deformation starting point of the first valve tongue 22, thereby ensuring that the actual stiffness of the first valve tongue is consistent with the theoretical stiffness, and thus ensuring that the exhaust curve of the compressor is consistent with the design value.

[0036] It is understandable that, in some embodiments, the first lift limiting post 11 is integrally formed on the inner wall of the exhaust chamber 10 of the cylinder head 1. Since the first lift limiting post 11 is integrally formed on the cylinder head 1, and the exhaust valve plates 2 are all assembled and clamped between the valve plate 3 and the cylinder head 1, it is not necessary to use a lift limiter to limit the opening angle of the exhaust valve plates as in traditional cylinder head assemblies. Therefore, the number of assembled parts is reduced, the assembly difficulty is reduced, and the assembly efficiency is improved. The aforementioned integral forming is, for example, formed by integral injection molding.

[0037] See details Figure 1 As shown, a connecting through hole (not marked in the figure) is provided at each of the four corners of the cylinder head 1, exhaust valve plate 2, valve plate 3 and intake valve plate 4. During assembly, the aforementioned components can be reliably fixed to the cylinder (not shown in the figure) by passing the corresponding connecting threaded parts through the aforementioned four connecting through holes. After assembly, the lift of the exhaust valve plate 2 can be limited.

[0038] In some embodiments, a first groove 122 is formed between the first lift limiting post 11 and the first pressing plane 121, and the first groove 122 is specifically a notch facing the side of the exhaust valve plate 2.

[0039] In this technical solution, by forming a first groove 122 between the first lift limiting post 11 and the first pressing plane 121, the deformation smoothness of the first valve tongue 22 when the pressure reaches the opening threshold can be ensured, and the deformation constraint of this part of the cylinder head 1 on the first valve tongue 22 can be prevented.

[0040] In some implementation methods, see details. Figure 1 and Figure 2As shown, the valve plate 3 also has a second exhaust through hole 32 and a third exhaust through hole 33. The valve plate body 21 is also connected to a second valve tongue 23 for controlling the opening and closing of the second exhaust through hole 32 and a third valve tongue 24 for controlling the opening and closing of the third exhaust through hole 33. The inner wall of the exhaust chamber 10 is also integrally formed with a second lift limit post 13 and a third lift limit post 14, which respectively limit the opening angle of the second valve tongue 23 and the third valve tongue 24. The lift limit height of the second lift limit post 13 and the third lift limit post 14 can be the same as or different from the lift limit height of the first lift limit post 11, and can be reasonably selected according to needs. As a preferred embodiment, the second lift limit post 13 and the third lift limit post 14 are also integrally formed on the inner wall of the exhaust chamber 10.

[0041] In this technical solution, by setting multiple exhaust ports and synchronously matching valve tongues and lift limiters for each exhaust port, the response and opening of each valve tongue in different frequency bands can be realized, thereby increasing the compressor's exhaust volume and thus improving the compressor's operating efficiency.

[0042] In some implementation methods, see details. Figure 2 and Figure 3 As shown, the assembly ring platform 12 also has a second pressing plane 123 corresponding to the tongue root position of the second valve tongue 23 and a third pressing plane 124 corresponding to the tongue root position of the third valve tongue 24. The inner edge of the second pressing plane 123 presses against the connection line between the tongue root of the second valve tongue 23 and the valve plate body 21, and the inner edge of the third pressing plane 124 presses against the connection line between the tongue root of the third valve tongue 24 and the valve plate body 21.

[0043] In this technical solution, the second pressing plane 123 and the third pressing plane 124 are further used to form positionally precise pressing constraints on the tongue root positions of the second valve tongue 23 and the third valve tongue 24, respectively, to ensure the positional accuracy of the deformation starting point of the second valve tongue 23 and the third valve tongue 24, thereby ensuring that the actual stiffness of the second valve tongue and the third valve tongue is consistent with the theoretical stiffness, and further ensuring that the exhaust curve of the compressor is consistent with the design value.

[0044] In some embodiments, a second groove 125 is formed between the second lift limiting post 13 and the second pressing plane 123, and / or a third groove 126 is formed between the third lift limiting post 14 and the third pressing plane 124. The aforementioned second groove 125 and third groove 126 may also be a notch facing the side of the exhaust valve plate 2.

[0045] In this technical solution, by forming a groove between each lift limit post and the corresponding pressing plane, the deformation smoothness of the corresponding volute when the pressure reaches the opening threshold can be ensured, and the deformation constraint of this part of the cylinder head 1 on each volute can be prevented.

[0046] In some embodiments, the cylinder head 1 has an axis of symmetry (not indicated in the figure), and the second exhaust port 32 and the third exhaust port 33 on the valve plate 3 are correspondingly symmetrical about the aforementioned axis of symmetry. The first exhaust port 31 itself is also symmetrical about the aforementioned axis of symmetry. In a more preferred embodiment, the centers of the holes of the first exhaust port 31, the second exhaust port 32, and the third exhaust port 33 are located on the same circle concentric with the center of the cylinder. This greatly improves space utilization and ensures a more rational arrangement of the exhaust ports. Correspondingly, the first valve tongue 22 is symmetrical about the aforementioned axis of symmetry, and the second valve tongue 23 and the third valve tongue 24 are also symmetrical about the aforementioned axis of symmetry. The first lift limit post 11, the second lift limit post 13, and the third lift limit post 14 are also correspondingly symmetrical about the aforementioned axis of symmetry, thus making the structural layout of the cylinder head 1 more rational. See details. Figure 2 As shown, the aforementioned second lift limit post 13 and third lift limit post 14 are arranged to the left and right and inclined about the aforementioned axis of symmetry to ensure the flow area of ​​the exhaust chamber.

[0047] In some embodiments, the lifting limiting surfaces of the first lifting limiting post 11, the second lifting limiting post 13, and the third lifting limiting post 14 gradually approach the inner arc surface of the exhaust chamber 10 from the root of the corresponding valve tongue to the side of the valve head. When working in conjunction with the valve tongues corresponding to each position, as each valve tongue opens, the valve tongue gradually wraps around and adheres to the arc surface of each lifting limiting post, which can reduce impact stress and improve the reliability of the exhaust valve plate 2.

[0048] In some embodiments, the length of the first valve tongue 22 is less than the lengths of the second valve tongue 23 and the third valve tongue 24, so that the first valve tongue 22 can achieve a stiffness difference with the second valve tongue 23 and the third valve tongue 24 through the length. In this case, the length L2 of the first lift limit post 11 is greater than the length L1 of the second lift limit post 13 and the length L2 of the third lift limit post 14, so as to reliably limit the lift of valve tongues with different stiffnesses.

[0049] In some embodiments, the second valve tongue 23 and the third valve tongue 24 have the same length, and the corresponding lengths of the second lift limit post 13 and the third lift limit post 14 are also designed to be equal to ensure the symmetry of the structure.

[0050] In some implementation methods, see details. Figure 5As shown in the figure, when projected on any radial surface of the cylinder head 1, the distance between the hole center of the first exhaust through hole 31 and the side wall of the first lift limit post 11 away from the first exhaust through hole 31 is K2, the limit head of the first lift limit post 11 corresponding to the first exhaust through hole 31 is a semicircle with a diameter D2, and 0.7<K2 / D2<1; and / or, the distance between the hole center of the second exhaust through hole 32 and the side wall of the second lift limit post 13 away from the second exhaust through hole 32 is K1, the limit head of the second lift limit post 13 corresponding to the second exhaust through hole 32 is a semicircle with a diameter D1, and 0.7<K1 / D1<1; and / or, the distance between the hole center of the third exhaust through hole 33 and the side wall of the third lift limit post 14 away from the third exhaust through hole 33 is K3, the limit head of the third lift limit post 14 corresponding to the third exhaust through hole 33 is a semicircle with a diameter D3, and 0.7<K3 / D3<1.

[0051] In this technical solution, by limiting the ratio of the distance between the projection of the hole center of each lift limit post and the corresponding exhaust through hole on a radial plane and the side wall away from the exhaust through hole to the diameter of the limit head, it can ensure the structural strength of the lift limit post, promote effective wrapping and attaching of the volute tongue at each position during the opening process, reduce exhaust impact velocity, and improve reliability.

[0052] In some embodiments, the lift of at least one of the first lift limit post 11, the second lift limit post 13 and the third lift limit post 14 is H, the aperture of at least one of the first exhaust through hole 31, the second exhaust through hole 32 and the third exhaust through hole 33 is D, and 0.12<H / D<0.28, so as to improve exhaust efficiency.

[0053] For further reference, see Figure 1 As shown in the figure, the exhaust valve plate 2 and the suction valve plate 4 are respectively located on both sides of the valve plate 3, wherein a suction through hole 25 corresponding to the position of the suction hole 34 on the suction valve plate 4 is formed on the exhaust valve plate 2, and the suction hole on each suction valve plate 4 is communicated with the suction chamber 15 on the cylinder head 1 through the suction through hole 25.

[0054] In some embodiments, a plurality of suction holes 34 are simultaneously provided on the suction valve plate 4, such as Figure 1 the three shown in the figure, the hole centers of the three suction holes 34 and the aforementioned first exhaust through hole 31, second exhaust through hole 32 and third exhaust through hole 33 are all on the same circle, further realizing the layout optimization of each exhaust through hole and suction hole. Corresponding to this structure, a single suction valve tongue 41 is correspondingly provided on the suction valve plate 4, and each suction valve tongue 41 controls the opening and closing of each suction hole 34 in a one-to-one correspondence.

[0055] The aforementioned air intake through hole 25 can be designed as a large through hole, and the aforementioned three air intake holes 34 can be simultaneously located within the range of the aforementioned air intake through hole 25.

[0056] The aforementioned intake valve plate 4 is also provided with exhaust passage holes 42 that correspond one-to-one with each of the aforementioned exhaust passage holes.

[0057] According to an embodiment of the present invention, a refrigerator is also provided, including the reciprocating compressor described above.

[0058] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0059] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model. The above description is only a preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A reciprocating compressor, comprising a cylinder head assembly, the cylinder head assembly comprising a cylinder head (1), an exhaust valve plate (2), and a valve plate (3) stacked sequentially, the valve plate (3) having a first exhaust through hole (31), the exhaust valve plate (2) comprising a valve plate body (21) and a first valve tongue (22) connected thereto and used to control the opening and closing of the first exhaust through hole (31), the cylinder head (1) having an exhaust chamber (10), and the inner wall of the exhaust chamber (10) having a first lift limiting post (11) for limiting the opening angle of the first valve tongue (22), characterized in that, The cylinder head (1) has an assembly ring platform (12) arranged around the opening of the exhaust chamber (10). The assembly ring platform (12) has a first pressing plane (121) corresponding to the tongue root position of the first valve tongue (22). The inner edge of the first pressing plane (121) is pressed against the connection line between the tongue root of the first valve tongue (22) and the valve plate body (21).

2. The reciprocating compressor according to claim 1, characterized in that, A first groove (122) is formed between the first lift limiting post (11) and the first pressing plane (121); and / or, the first lift limiting post (11) is integrally formed on the inner wall of the exhaust chamber (10).

3. The reciprocating compressor according to claim 1, characterized in that, The valve plate (3) is also provided with a second exhaust through hole (32) and a third exhaust through hole (33). The valve plate body (21) is also provided with a second valve tongue (23) for controlling the opening and closing of the second exhaust through hole (32) and a third valve tongue (24) for controlling the opening and closing of the third exhaust through hole (33). The inner wall of the exhaust chamber (10) is also integrally formed with a second lift limit post (13) and a third lift limit post (14) for limiting the opening angle of the second valve tongue (23) and the third valve tongue (24) respectively.

4. The reciprocating compressor according to claim 3, characterized in that, The assembly ring platform (12) also has a second pressing plane (123) corresponding to the tongue root position of the second valve tongue (23) and a third pressing plane (124) corresponding to the tongue root position of the third valve tongue (24). The inner edge of the second pressing plane (123) presses against the connection line between the tongue root of the second valve tongue (23) and the valve plate body (21), and the inner edge of the third pressing plane (124) presses against the connection line between the tongue root of the third valve tongue (24) and the valve plate body (21).

5. The reciprocating compressor according to claim 4, characterized in that, A second groove (125) is formed between the second lift limit post (13) and the second pressing plane (123), and / or a third groove (126) is formed between the third lift limit post (14) and the third pressing plane (124).

6. The reciprocating compressor according to claim 3, characterized in that, The cylinder head (1) has an axis of symmetry, the first valve tongue (22) is symmetrical about the axis of symmetry, the second valve tongue (23) and the third valve tongue (24) are symmetrical about the axis of symmetry; and / or, the lifting limit surfaces of the first lift limit post (11), the second lift limit post (13) and the third lift limit post (14) are arc-shaped surfaces that gradually approach the inner side of the exhaust chamber (10) from the root of the valve tongue to the side of the valve head.

7. The reciprocating compressor according to claim 6, characterized in that, The length of the first valve tongue (22) is less than the length of the second valve tongue (23), and the lengths of the second valve tongue (23) and the third valve tongue (24) are equal.

8. The reciprocating compressor according to claim 3, characterized in that, When projected on any radial plane of the cylinder head (1), the spacing between the hole center of said first exhaust through hole (31) and the side wall of said first lift limiting post (11) that is away from said first exhaust through hole (31) is K2, the limiting head of said first lift limiting post (11) corresponding to said first exhaust through hole (31) is a semicircle with a diameter D2, 0.7<K2 / D2<1; and / or, the spacing between the hole center of said second exhaust through hole (32) and the side wall of said second lift limiting post (13) that is away from said second exhaust through hole (32) is K1, the limiting head of said second lift limiting post (13) corresponding to said second exhaust through hole (32) is a semicircle with a diameter D1, 0.7<K1 / D1<1; and / or, the spacing between the hole center of said third exhaust through hole (33) and the side wall of said third lift limiting post (14) that is away from said third exhaust through hole (33) is K3, the limiting head of said third lift limiting post (14) corresponding to said third exhaust through hole (33) is a semicircle with a diameter D3, 0.7<K3 / D3<1.

9. The reciprocating compressor according to claim 8, characterized in that, The lift of at least one of said first lift limiting post (11), said second lift limiting post (13) and said third lift limiting post (14) is H, the aperture of at least one of said first exhaust through hole (31), said second exhaust through hole (32) and said third exhaust through hole (33) is D, 0.12<H / D<0.

28.

10. A refrigerator, characterized in that, A reciprocating compressor comprising the reciprocating compressor according to any one of claims 1 to 9.

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