Pump body structure and rotor refrigerant pump

Abstract

The invention relates to the technical field of rotor refrigerant pumps, in particular to a pump body structure and a rotor refrigerant pump comprising the pump body structure. The pump body structure comprises a piston which can be eccentrically and rotatably arranged in a cavity in an air cylinder, and an air cylinder groove communicated with the cavity is formed in the side wall of the air cylinder; the blade is arranged in the air cylinder groove in a reciprocating motion mode, and the front end face of the blade abuts against the peripheral face of the piston; the connecting piece is connected with the blade and the piston, and the connecting piece and the piston are in sliding fit in the circumferential direction of the piston. The blade and the piston are connected through the connecting piece, so that the piston and the blade cannot be separated structurally, and the possibility that the blade and the piston are separated in the operation process is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of rotor refrigerant pumps, and in particular to a pump body structure and a rotor refrigerant pump comprising the pump body structure. Background Art

[0002] A rotary refrigerant pump consists primarily of two main components: the motor and the pump body. The pump body comprises the cylinder, upper and lower cylinder heads, crankshaft, piston, and vanes. The long end of the crankshaft is connected to the motor rotor, which drives the crankshaft in rotation. The piston fits over the eccentric portion of the crankshaft and rolls along the inner wall of the cylinder, forming a crescent-shaped working chamber between the piston's outer diameter and the cylinder's inner diameter. A cylinder groove is defined in the sidewall of the cylinder, connecting the crescent-shaped working chamber. Vanes are positioned within this groove for reciprocating motion and are held against the piston's outer circumference by a spring. The vanes divide the crescent-shaped working chamber into a suction chamber and a compression chamber. The rotation of the crankshaft's eccentric portion changes the radial position of the contact point between the piston and the vanes, causing the vanes to perform linear reciprocating motion within the groove under the combined action of the piston and spring.

[0003] Currently, the main method for achieving proper alignment between the blade and the cylinder is to control the small gap between the cylinder groove and the blade. When the compression ratio is very low, and the eccentric end of the crankshaft is far away from the blade, the spring force is too low. If the blade's reaction speed cannot keep up with the rotation of the eccentric portion of the crankshaft, the blade will not be able to maintain close contact with the piston, and the blade and piston will separate. When the compression ratio is very high, the blade may stick to one side of the cylinder groove. In this case, the spring force is too low, resulting in the spring force being unable to overcome the friction between the blade and the cylinder groove, and the blade will separate from the piston. Summary of the Invention

[0004] In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to provide a pump body structure that can prevent the blades from separating from the piston.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] The present invention provides a pump body structure, comprising: a piston, which can be eccentrically rotatably arranged in a cavity inside a cylinder, and a cylinder groove connected to the cavity is opened on the side wall of the cylinder; a blade, which can be reciprocatingly arranged in the cylinder groove, and the front end surface of the blade abuts against the outer peripheral surface of the piston; a connecting piece, which connects the blade and the piston, and the connecting piece and the piston are slidably matched along the circumference of the piston.

[0007] Preferably, a piston groove extending along the circumferential direction is provided on the piston, and the end of the connecting piece away from the blade can be slidably embedded in the piston groove. The area of ​​the piston groove extending along the circumferential direction of the piston at least covers the area in contact with the front end surface of the blade during one rotation of the piston in the circumferential direction of the piston.

[0008] Preferably, the piston groove is an arc-shaped groove coaxial with the piston, the chord length of the arc-shaped groove is L1, the eccentric distance of the piston performing eccentric rotation in the cavity of the cylinder is e, and satisfies: 2e<L1<2e+2mm.

[0009] Preferably, a blade groove is provided on the blade, and an end of the connecting piece away from the piston is embedded in the blade groove and snap-fitted with the blade groove.

[0010] Preferably, the piston groove is provided on at least one of the two axially opposite end surfaces of the piston, and the blade groove is provided on at least one corresponding side surface of the two axially opposite side surfaces of the blade along the piston.

[0011] Preferably, the piston groove is formed by being recessed from the outer edge of the end face of the piston and passes through the outer peripheral surface of the piston, the blade groove is formed by being recessed from the front end of the side face of the blade and passes through the front end face of the blade, and the connecting piece is accommodated in the piston groove and the blade groove and is flush with the end face of the piston and the side face of the blade.

[0012] Preferably, the piston groove includes a sunken groove formed from the outer edge of the end face of the piston and penetrating the outer circumferential surface of the piston, and a sliding groove extending along the circumference of the piston formed by the depression of part of the bottom surface of the sunken groove; the blade groove includes a shallow groove and a deep groove formed from the front end of the side face of the blade and connected in sequence along the direction away from the piston, the shallow groove penetrates the front end face of the blade, the depression depth of the deep groove is greater than the depression depth of the shallow groove, and a step surface is formed between the deep groove and the shallow groove; the connecting piece includes a main body and a piston connector and a blade connector extending from both ends of one side surface of the main body, the piston connector can be slidably embedded in the sliding groove, the blade connector is embedded in the deep groove and abuts against the step surface, the main body is accommodated in the sunken groove and the shallow groove, and the other side surface of the main body is flush with the end face of the piston and the side face of the blade.

[0013] Preferably, the inner side surface of the piston connector facing the blade connector is a convex arc surface, and the end surface of one end of the main body provided with the piston connector is a convex arc surface.

[0014] Preferably, the piston includes a piston body and a connecting ring, the outer peripheral surface of at least one of the two axially opposite ends of the piston body is recessed to form an annular groove, the connecting ring is sleeved in the annular groove, and the piston groove is opened on the connecting ring.

[0015] The present invention also provides a rotor refrigerant pump comprising the pump body structure described above.

[0016] Compared with the prior art, the present invention has significant improvements:

[0017] The pump body structure of the present invention connects the piston and the vanes via a connector. During the eccentric rotation of the piston in the cavity inside the cylinder, the connector and the piston slide relative to each other along the circumference of the piston, maintaining their circumferential position. The connector changes its radial position as the piston rotates eccentrically. The radial movement of the connector drives the vanes connected thereto to move synchronously, causing the vanes to perform linear reciprocating motion within the cylinder groove. Furthermore, under the constraint of the connector, the front end faces of the vanes and the outer peripheral surface of the piston always maintain abutting contact and will not separate. Thus, by connecting the vanes and the piston via the connector, the piston and the vanes structurally cannot separate, thereby avoiding the possibility of the vanes and the piston separating during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic top view of the pump body structure of an embodiment of the present invention.

[0019] Figure 2 yes Figure 1 Enlarged schematic diagram of part A in the middle.

[0020] Figure 3 3a to 3d are schematic diagrams of the movement process of the pump body structure of an embodiment of the present invention.

[0021] Figure 4 4a to 4d are schematic diagrams of the positional relationship between the blades and the piston during the movement of the pump body structure of an embodiment of the present invention.

[0022] Figure 5 It is a structural schematic diagram of the piston in the pump body structure of an embodiment of the present invention.

[0023] Figure 6 It is a top view schematic diagram of the piston in the pump body structure of an embodiment of the present invention.

[0024] Figure 7 yes Figure 6 Schematic cross-sectional view along the BB direction.

[0025] Figure 8 It is a schematic top view of the blades in the pump body structure of an embodiment of the present invention.

[0026] Figure 9 It is a schematic diagram of the front end surface of the blade in the pump body structure of an embodiment of the present invention.

[0027] Figure 10 It is a schematic cross-sectional view along CC direction in Figure 9.

[0028] Figure 11 It is a top view schematic diagram of the connecting block in the pump body structure of an embodiment of the present invention.

[0029] Figure 12It is a side view schematic diagram of the connecting block in the pump body structure of an embodiment of the present invention.

[0030] The description of the accompanying drawings is as follows:

[0031] 1 piston

[0032] 101 Piston body

[0033] 102 connecting ring

[0034] 11 Piston groove

[0035] 111 Sink

[0036] 112 chute

[0037] 2 blades

[0038] 20 front face

[0039] 21 blade groove

[0040] 211 shallow groove

[0041] 212 deep groove

[0042] 213 step surface

[0043] 3 Connectors

[0044] 31 Main body

[0045] 32 piston connector

[0046] 33 blade connector

[0047] 4 cylinders

[0048] 41 Cylinder slot

[0049] 5 Crankshaft

[0050] 51 eccentric part DETAILED DESCRIPTION

[0051] The following is a further detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, and are not intended to limit the present invention.

[0052] In the description of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0053] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0054] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0055] like Figures 1 to 12 The figure shows an embodiment of the pump body structure provided by the present invention. The pump body structure of this embodiment is suitable for a rotary refrigerant pump, which typically includes a cylinder 4 and a crankshaft 5. Cylinder 4 is an axially continuous cylinder structure, with cylinder heads enclosing both ends of the cylinder 4 along the axial direction, forming a sealed cavity. Crankshaft 5 has a long axis end connected to the motor rotor and an eccentric portion 51 eccentrically disposed relative to the long axis end. The long axis end of crankshaft 5 is coaxially disposed with cylinder 4, and eccentric portion 51 of crankshaft 5 is positioned within the cavity within cylinder 4. The pump body structure of this embodiment is disposed between eccentric portion 51 of crankshaft 5 and cylinder 4.

[0056] See also Figure 1 and Figure 2 The pump body structure of this embodiment includes a piston 1, blades 2 and a connecting piece 3.

[0057] The piston 1 is eccentrically rotatably disposed within the cavity of the cylinder 4. The piston 1 is sleeved onto the eccentric portion 51 of the crankshaft 5. When the motor drives the crankshaft 5 to rotate, the eccentric portion 51 of the crankshaft 5 drives the piston 1 to perform eccentric rotational motion within the cavity of the cylinder 4, causing the piston 1 to roll along the inner wall of the cylinder 4, forming a crescent-shaped working chamber between the outer circumference of the piston 1 and the inner wall of the cylinder 4. A cylinder groove 41 is defined in the sidewall of the cylinder 4, communicating with the cavity within the cylinder 4. The cylinder groove 41 preferably extends radially of the cylinder 4.

[0058] The blade 2 is arranged in the cylinder groove 41 so as to be reciprocatingly movable, and the front end face 20 of the blade 2 abuts against the outer peripheral surface of the piston 1. The front end face 20 of the blade 2 refers to the end face of the blade 2 that is inserted into the cylinder groove 41 and is close to the piston 1. The front end face 20 of the blade 2 is preferably a convex arc surface. The front end face 20 of the blade 2 is in the shape of an elongated strip extending along the axial direction of the piston 1 and covers the outer peripheral surface of the piston 1 in the axial direction of the piston 1, thereby the blade 2 divides the crescent-shaped working chamber between the outer peripheral surface of the piston 1 and the inner wall surface of the cylinder 4 into a suction chamber and a compression chamber. When the piston 1 rotates eccentrically in the cavity inside the cylinder 4, the radial position of the point where the front end face 20 of the blade 2 abuts against the outer peripheral surface of the piston 1 changes, causing the blade 2 to perform linear reciprocating motion in the cylinder groove 41.

[0059] The connecting member 3 connects the blade 2 and the piston 1 , and the connecting member 3 and the piston 1 are slidably matched along the circumferential direction of the piston 1 .

[0060] See also Figure 3 and Figure 4 During the eccentric rotation of the piston 1 in the cavity inside the cylinder 4, the connecting member 3 and the piston 1 slide relative to each other along the circumference of the piston 1 and remain in their circumferential position. As the piston 1 rotates eccentrically, the connecting member 3 changes its radial position. The radial movement of the connecting member 3 drives the blade 2 connected thereto to move synchronously, causing the blade 2 to perform linear reciprocating motion in the cylinder groove 41. Furthermore, under the constraint of the connecting member 3, the front end surface 20 of the blade 2 always maintains contact with the outer circumferential surface of the piston 1 and will not separate. Thus, the pump body structure of this embodiment connects the piston 1 and the blade 2 via the connecting member 3, so that the piston 1 and the blade 2 will not separate structurally, thereby avoiding the possibility of the blade 2 and the piston 1 separating during operation.

[0061] In this embodiment, preferably, a piston groove 11 extending circumferentially is provided on the piston 1. The end of the connecting member 3 distal from the vane 2 is slidably embedded in the piston groove 11. The area of ​​the piston groove 11 extending circumferentially along the piston 1 covers at least the area of ​​the piston 1 where the front end face 20 of the vane 2 contacts the outer circumferential surface of the piston 1 during one rotation of the piston 1. That is, during the eccentric rotation of the piston 1 within the cavity of the cylinder 4, the front end face 20 of the vane 2 abuts against the outer circumferential surface of the piston 1. The contact position has a certain reciprocating displacement range along the circumferential direction of the outer circumferential surface of the piston 1, forming a contact area. The piston groove 11 is provided in this contact area, and the piston groove 11 covers this contact area along the circumferential direction of the piston 1. Therefore, when the piston 1 rotates, the sliding displacement range of the connecting member 3 within the piston groove 11 covers the reciprocating displacement range of the contact position between the front end face 20 of the vane 2 and the outer circumferential surface of the piston 1 along the circumferential direction of the piston 1, thereby not interfering with or hindering the rotation of the piston 1.

[0062] Preferably, in this embodiment, the piston groove 11 is an arc-shaped groove coaxial with the piston 1, the chord length of the arc-shaped groove is L1, the eccentric distance of the eccentric rotation of the piston 1 in the cavity of the cylinder 4 is e, that is, the eccentric distance of the eccentric portion 51 of the crankshaft 5 is e, and the chord length L1 of the piston groove 11 satisfies: 2e<L1<2e+2mm, thereby ensuring that the connecting part 3 sliding in the piston groove 11 during the rotation of the piston 1 will not interfere with or hinder the rotation of the piston 1.

[0063] Preferably, in this embodiment, a blade groove 21 is provided on the blade 2, and the end of the connecting member 3 away from the piston 1 is embedded in the blade groove 21 and engages with the blade groove 21. During the process of the crankshaft 5 driving the piston 1 to rotate eccentrically, when the eccentric end of the eccentric portion 51 of the crankshaft 5 approaches the blade 2, the piston 1 pushes the connecting member 3 and the blade 2 to move in a direction away from the piston 1; when the eccentric end of the eccentric portion 51 of the crankshaft 5 leaves the blade 2, the piston 1 pulls the connecting member 3 to move in a direction close to the piston 1, and through the engagement between the connecting member 3 and the blade groove 21 on the blade 2, the connecting member 3 pulls the blade 2 to move synchronously, so that the front end face 20 of the blade 2 maintains contact with the outer peripheral surface of the piston 1. In addition, if necessary, a spring can be set against the rear end face of the blade 2 to assist the connecting member 3 in pulling the blade 2 to move synchronously, so that the front end face 20 of the blade 2 and the outer peripheral surface of the piston 1 can better maintain contact with each other.

[0064] In this embodiment, preferably, combined with Figures 5 to 7 The piston groove 11 is provided on at least one of the two axially opposite end faces of the piston 1, and is combined with Figures 8 to 10 , the blade groove 21 is provided on at least one corresponding side surface of the blade 2 on the two axially opposite side surfaces of the piston 1. The piston groove 11 and the blade groove 21 are provided on the same side of the piston 1 and the blade 2 along the axial direction of the piston 1 and are connected by a connecting piece 3. In this way, the connecting piece 3 can be installed on the side surfaces of the piston 1 and the blade 2 along the axial direction of the piston 1, which facilitates the assembly of the connecting piece 3. Preferably, piston grooves 11 are provided on both end surfaces of the piston 1 that are opposite to each other in the axial direction, and correspondingly, blade grooves 21 are also provided on both side surfaces of the blade 2 that are opposite to each other in the axial direction of the piston 1, and the piston grooves 11 and blade grooves 21 on the same side are connected by a connecting piece 3.

[0065] Preferably, in this embodiment, the piston groove 11 is formed by being recessed from the outer edge of the end face of the piston 1 and passes through the outer peripheral surface of the piston 1. The end face of the piston 1 refers to any end face of the two axially opposite end faces of the piston 1. The blade groove 21 is formed by being recessed from the front end of the side face of the blade 2 and passes through the front end face 20 of the blade 2. The side face of the blade 2 refers to any side face of the two axially opposite end faces of the blade 2 along the piston 1. The connector 3 is accommodated in the piston groove 11 and the blade groove 21 and is flush with the end face of the piston 1 and the side face of the blade 2, so that the blade 2, the piston 1 and the connector 3 together separate the cavity inside the cylinder 4 into a suction chamber and a compression chamber, and ensure effective isolation between the suction chamber and the compression chamber.

[0066] Preferably, see Figures 5 to 7 The piston groove 11 includes a recessed groove 111 and a sliding groove 112. The recessed groove 111 is formed by a depression at the outer edge of the end face of the piston 1, and the recessed groove 111 passes through the outer circumferential surface of the piston 1. The recessed groove 111 is preferably an arc-shaped notch. The sliding groove 112 is formed by a depression of part of the bottom surface of the recessed groove 111, and the sliding groove 112 extends along the circumference of the piston 1, that is, the sliding groove 112 is a circular arc-shaped groove formed on the bottom surface of the recessed groove 111 and is coaxial with the piston 1. The arc length of the sliding groove 112 is preferably consistent with the arc length of the recessed groove 111, and the chord length of the sliding groove 112 is the chord length L1 of the piston groove 11. The sliding groove 112 is formed with an outer arc surface away from the center of the piston 1 and an inner arc surface close to the center of the piston 1. Both the outer arc surface and the inner arc surface are coaxial with the piston 1. The radius of the outer arc surface is R1, and the radius of the inner arc surface is R2, and R1>R2.

[0067] To facilitate the machining of the piston groove 11 on the piston 1, the piston 1 preferably includes a piston body 101 and a connecting ring 102. The outer circumferential surface of at least one of the two axially opposing ends of the piston body 101 is recessed to form an annular groove. The connecting ring 102 is sleeved within the annular groove and forms a complete cylindrical shape with the piston body 101. The connecting ring 102 is preferably fixedly connected to the annular groove of the piston body 101 via an interference fit. The piston groove 11 is formed on the connecting ring 102. This allows the piston groove 11 to be machined on the connecting ring 102 first, and then the connecting ring 102 is assembled to the piston body 101, which further facilitates the machining of the piston groove 11. In this embodiment, preferably, the outer circumferential surfaces of the two axially opposing ends of the piston body 101 are recessed to form annular grooves. Two connecting rings 102 are provided, and the two connecting rings 102 are sleeved within the two annular grooves, forming a complete cylindrical shape with the piston body 101. The two connecting rings 102 each have a piston groove 11 machined at a corresponding position along the axial direction.

[0068] See also Figures 8 to 10The blade groove 21 includes a shallow groove 211 and a deep groove 212. Both the shallow groove 211 and the deep groove 212 are formed by depressions from the front end of the side surface of the blade 2, and the shallow groove 211 and the deep groove 212 are sequentially connected in the direction away from the piston 1, that is, the shallow groove 211 is close to the piston 1, and the deep groove 212 is away from the piston 1. The shallow groove 211 passes through the front end surface 20 of the blade 2. The depression depth of the deep groove 212 is greater than the depression depth of the shallow groove 211. The depression depth of the deep groove 212 refers to the depth H1 of the deep groove 212 depressed inward from the side surface of the blade 2, and the depression depth of the shallow groove 211 refers to the depth H2 of the shallow groove 211 depressed inward from the side surface of the blade 2, where H1>H2. A step surface 213 is formed between the deep groove 212 and the shallow groove 211. The step surface 213 faces away from the front end surface 20 of the blade 2. The step surface 213 is used to engage with the connector 3 embedded in the blade groove 21. Therefore, the blade groove 21 is an L-shaped groove formed by connecting a shallow groove 211 and a deep groove 212 .

[0069] Preferably, the width of the deep groove 212 is greater than the width of the shallow groove 211. The width of the deep groove 212 refers to the dimension W1 of the deep groove 212 extending tangentially along the outer periphery of the piston 1 on the side of the blade 2, and the width of the shallow groove 211 refers to the dimension W2 of the shallow groove 211 extending tangentially along the outer periphery of the piston 1 on the side of the blade 2. W1>W2, thereby increasing the area of ​​the step surface 213, which is conducive to the connector 3 being embedded in the blade groove 21 and engaging with the step surface 213.

[0070] Preferably, the length of the deep groove 212 is greater than the length of the shallow groove 211. The length of the deep groove 212 refers to the dimension L2 of the deep groove 212 extending radially along the cylinder 4 on the side of the blade 2, and the length of the shallow groove 211 refers to the dimension L3 of the shallow groove 211 extending radially along the cylinder 4 on the side of the blade 2. L2>L3. The longer length of the deep groove 212 makes it easier for the connecting part 3 to be embedded in the deep groove 212 and to be snap-fitted with the step surface 213.

[0071] See also Figure 11 and Figure 12The connector 3 includes a main body 31, a piston connector 32, and a vane connector 33. The piston connector 32 and the vane connector 33 extend from opposite ends of one side surface of the main body 31. The piston connector 32 is slidably embedded in the slide groove 112 of the piston groove 11, thereby achieving a sliding connection between the connector 3 and the piston groove 11 of the piston 1. The vane connector 33 is embedded in the deep groove 212 of the vane groove 21 and abuts against the stepped surface 213, thereby achieving a snap-fit ​​connection between the connector 3 and the vane groove 21 of the vane 2. The main body 31 is accommodated in the recessed groove 111 of the piston groove 11 and the shallow groove 211 of the blade groove 21, and the other side surface of the main body 31 (the other side surface opposite to the side surface from which the piston connector 32 and the blade connector 33 extend) is flush with the end face of the piston 1 and the side face of the blade 2, thereby achieving that the connecting member 3 is accommodated in the piston groove 11 and the blade groove 21 and is flush with the end face of the piston 1 and the side face of the blade 2.

[0072] Preferably, the recessed depth of the sunken groove 111 of the piston groove 11 is consistent with the recessed depth H2 of the shallow groove 211 of the blade groove 21. The recessed depth of the sunken groove 111 refers to the depth H3 of the sunken groove 111 from the outer edge of the end face of the piston 1, where H3 = H2. Thus, the main body 31 of the connector 3 can be configured as a flat plate with a thickness consistent with H3 / H2. The thickness of the main body 31 refers to the distance dimension H4 between the two side surfaces of the main body 31, where H4 = H3 = H3. Therefore, when the main body 31 is placed within the sunken groove 111 of the piston groove 11 and the shallow groove 211 of the blade groove 21, the side surface of the main body 31 opposite the side surface extending from the piston connector 32 and the blade connector 33 can be flush with the end face of the piston 1 and the side surface of the blade 2.

[0073] Preferably, the width of the main body 31 of the connecting member 3 is smaller than the width W2 of the shallow groove 211 of the blade groove 21. The width of the main body 31 refers to the dimension T1 of the main body 31 extending tangentially along the outer periphery of the piston 1. T1<W2, so that the main body 31 can be embedded in the shallow groove 211 of the blade groove 21.

[0074] Preferably, the width of the blade connector 33 of the connector 3 is greater than the width W2 of the shallow groove 211 of the blade recess 21, and less than the width W1 of the deep groove 212 of the blade recess 21. The width of the blade connector 33 refers to the dimension T2 of the blade connector 33 extending tangentially along the outer periphery of the piston 1, where W2 < T2 < W1. The length of the blade connector 33 is less than the length L2 of the deep groove 212. The length of the blade connector 33 refers to the dimension L4 of the blade connector 33 extending radially along the cylinder 4, where L4 < L2. This allows the blade connector 33 to fit within the deep groove 212 of the blade recess 21 and engage with the stepped surface 213.

[0075] Preferably, the inner side surface of the piston connecting head 32 of the connecting member 3 is a convex arc surface. The inner side surface of the piston connecting head 32 refers to the side surface of the piston connecting head 32 opposite to the blade connecting head 33. The radius of this arc surface is R3, and preferably satisfies: R2 < R3 ≤ R1. One end end surface of the main body portion 31 of the connecting member 3 where the piston connecting head 32 is provided is a convex arc surface, and the radius of this arc surface is also R3, and preferably satisfies: 5T1 ≤ R3 < R1. Preferably, the piston connecting head 32 of the connecting member 3 is provided as a cylinder, and the radius of this cylinder is R3. This is beneficial to the sliding fit between the piston connecting head 32 and the sliding groove 112 of the piston groove 11.

[0076] Based on the pump body structure of the present invention, an embodiment of the present invention further provides a rotor refrigerant pump. The rotor refrigerant pump of this embodiment includes the pump body structure described above in this embodiment.

[0077] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and replacements can be made, and these improvements and replacements should also be regarded as the protection scope of the present invention.

Claims

1. A pump body structure, characterized in that: include: A piston (1) is eccentrically rotatably disposed in a cavity within a cylinder (4), wherein a cylinder groove (41) communicating with the cavity is formed on a side wall of the cylinder (4); A blade (2) is reciprocatingly disposed in the cylinder groove (41), wherein the front end surface (20) of the blade (2) abuts against the outer peripheral surface of the piston (1); A connecting member (3) connects the blade (2) and the piston (1), and the connecting member (3) and the piston (1) are slidably matched along the circumference of the piston (1).

2. The pump structure according to claim 1, characterized in that: The piston (1) is provided with a piston groove (11) extending in the circumferential direction, and the end of the connecting member (3) away from the blade (2) is slidably embedded in the piston groove (11), and the area of ​​the piston groove (11) extending in the circumferential direction of the piston (1) at least covers the area in contact with the front end surface (20) of the blade (2) during the process of the piston (1) rotating one circle in the circumferential direction of the piston (1).

3. The pump structure according to claim 2, characterized in that: The piston groove (11) is a circular arc groove coaxial with the piston (1), the chord length of the circular arc groove is L1, the eccentric distance of the eccentric rotation motion of the piston (1) in the cavity of the cylinder (4) is e, and satisfies: 2e<L1<2e+2mm.

4. The pump structure according to claim 2, characterized in that: A blade groove (21) is provided on the blade (2), and one end of the connecting member (3) away from the piston (1) is embedded in the blade groove (21) and is engaged with the blade groove (21).

5. The pump structure according to claim 4, characterized in that: The piston groove (11) is formed on at least one of the two axially opposite end faces of the piston (1), and the blade groove (21) is formed on at least one corresponding side face of the blade (2) on the two axially opposite side faces of the piston (1).

6. The pump structure according to claim 5, characterized in that: The piston groove (11) is formed by being recessed from the outer edge of the end face of the piston (1) and passes through the outer peripheral surface of the piston (1); the blade groove (21) is formed by being recessed from the front end of the side face of the blade (2) and passes through the front end face (20) of the blade (2); the connecting member (3) is accommodated in the piston groove (11) and the blade groove (21) and is flush with the end face of the piston (1) and the side face of the blade (2).

7. The pump structure according to claim 6, characterized in that: The piston groove (11) comprises a recessed groove (111) formed from the outer edge of the end surface of the piston (1) and penetrating the outer peripheral surface of the piston (1), and a sliding groove (112) formed by recessing a portion of the bottom surface of the recessed groove (111) and extending along the circumferential direction of the piston (1); the blade groove (21) comprises a shallow groove (211) and a deep groove (212) formed from the front end of the side surface of the blade (2) and connected in sequence along the direction away from the piston (1), the shallow groove (211) penetrating the front end surface (20) of the blade (2), the recessed depth of the deep groove (212) being greater than the recessed depth of the shallow groove (211), and the deep groove (212) extending in the circumferential direction of the piston (1). 2) and the shallow groove (211) form a step surface (213); the connecting member (3) includes a main body (31) and a piston connecting head (32) and a blade connecting head (33) extending from both ends of one side surface of the main body (31), the piston connecting head (32) is slidably embedded in the sliding groove (112), the blade connecting head (33) is embedded in the deep groove (212) and abuts against the step surface (213), the main body (31) is accommodated in the sinking groove (111) and the shallow groove (211), and the other side surface of the main body (31) is flush with the end face of the piston (1) and the side face of the blade (2).

8. The pump structure according to claim 7, characterized in that: The inner side surfaces of the piston connector (32) and the blade connector (33) opposite to each other are convex arc surfaces, and the main body (31) is provided with an end surface of the piston connector (32) which is a convex arc surface.

9. The pump structure according to claim 5, characterized in that: The piston (1) comprises a piston body (101) and a connecting ring (102); the outer peripheral surface of at least one of the two axially opposite ends of the piston body (101) is recessed to form an annular groove; the connecting ring (102) is sleeved in the annular groove; and the piston groove (11) is provided on the connecting ring (102).

10. A rotor refrigerant pump, characterized in that: The pump body structure comprises the pump body structure according to any one of claims 1 to 9.

Images